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Keysight NFA Series Noise Figure Analyzers Service Guide

461

Assembly Replacement Procedures
Front Frame Assembly

Figure 15-55

Front Frame Exploded View

Содержание N8973B

Страница 1: ... the following analyzers N8973B 10 MHz 3 6 GHz N8974B 10 MHz 7 GHz N8975B 10 MHz 26 5 GHz N8976B 10 MHz 40 GHz Notice This document contains references to Agilent Please note that Agilent s Test and Measurement business has become Keysight Technologies For more information go to www keysight com ...

Страница 2: ... S government customers under its standard commercial license which is embodied in its End User License Agreement EULA a copy of which can be found at http www keysight com find sweula The license set forth in the EULA represents the exclusive authority by which the U S government may use modify distribute or disclose the Software The EULA and the license set forth therein does not require or perm...

Страница 3: ...s by email subscribe to Keysight Email Updates at the following URL http www keysight com find MyKeysight Information on preventing instrument damage can be found at www keysight com find PreventingInstrumentRepair Is your product software up to date Periodically Keysight releases software updates to fix known defects and incorporate product enhancements To search for software updates for your pro...

Страница 4: ...4 ...

Страница 5: ...e and ESD 21 For Additional Information about ESD 21 Service Equipment You Will Need 22 Calibration Application Software 22 Front End Controller Troubleshooting Kit 23 USB Keyboard and Mouse 24 USB Storage Device 24 Required Test Equipment List 25 After an Instrument Repair 37 Contacting Keysight Technologies 38 Instrument Serial Numbers 41 How to Return Your Instrument for Service 42 Service Orde...

Страница 6: ...t Queues 72 Advisory Messages 74 Event Messages 80 800 Operation Complete Event 81 700 Request Control Event 81 600 User Request Event 81 500 Power on Event 81 400 to 499 Query Errors 81 300 to 399 Device Specific Errors 82 221 Settings Conflict Errors 85 200 to 299 Execution Errors 96 100 to 199 Command Errors 107 0 Error 109 Condition Messages 110 Condition errors 1 to 99 Calibration 110 Conditi...

Страница 7: ...al Path 206 Troubleshooting a Low Band Problem 209 Quick Check to Verify High Band RF Path 216 Troubleshooting a High Band Problem 221 6 Front End Control Troubleshooting What You Will Find in This Chapter 229 A15 Front End Control Description 230 Purpose 230 A15 Front End Control Assembly Troubleshooting 235 Verifying Input Attenuator A Input Attenuator B Low Band Switch Logic and Power Supplies ...

Страница 8: ...Controller 292 Power Supply Control 292 Rear Panel Connectivity 293 System Memory 294 System Processor 294 Processor Battery 294 SD Memory Card Slot 294 A4 Processor Assembly Troubleshooting 295 Boot Up or Initialization Problems 295 BIOS Settings 295 A5 Disk Drive Description 296 Drive Partitioning 297 Instrument Image Recovery System 298 A5 Disk Drive Troubleshooting 299 Troubleshooting Software...

Страница 9: ...k Diagram 327 N8976B RF Highband Path 2 Block Diagram 328 N8976B RF Highband Path 3 Block Diagram 329 Reference and Synthesizer Block Diagram 330 25 MHz Bandwidth I F System Block Diagram 331 NFA Computer Block Diagram 332 13 Service and Diagnostics Menus Overview 333 Controlling Access 334 Secure service access 335 Service Key Descriptions 339 Timebase 339 Alignments 340 Corrections 344 Band Lock...

Страница 10: ...wave Instruments 406 RF Area N8976B 409 Low Band Switch 411 Attenuators 415 YTF Preselector 417 RF Front End Assembly N8973B 74B 75B 420 Removal 420 Replacement 421 RF Front End Assembly N8976B 422 Removal 422 Replacement 423 Front End Control Assembly 424 Removal 424 Replacement 426 L O Synthesizer Assembly 427 Removal 427 Replacement 427 Rear Panel 428 Removal 428 Replacement 428 Reference Assem...

Страница 11: ...n PRC 459 Front Frame Assembly Components 460 16 Post Repair Procedures What You Will Find in This Chapter 471 Before Starting 471 Post Repair Procedures 472 Additional Tasks 476 17 Functional Tests Functional Test Performance Verification 487 Before Performing a Functional Test 488 Test Equipment 489 Displayed Average Noise Level DANL 492 Procedure 492 Frequency Readout Accuracy 495 Procedure 496...

Страница 12: ...510 Scale Fidelity 514 Procedure 515 18 Instrument Software What You Will Find in This Chapter 517 Instrument Software Overview 518 Software Licensing 519 Software Updates 520 Instrument Measurement Application Software 520 ...

Страница 13: ...lowing sections are found in this chapter Keysight NFA Series Noise Figure Analyzer Overview on page 14 Analyzer Accessories on page 15 Before You Start Troubleshooting on page 18 ESD Information on page 20 Service Equipment You Will Need on page 22 After an Instrument Repair on page 37 Contacting Keysight Technologies on page 38 How to Return Your Instrument for Service on page 42 ...

Страница 14: ... parameters such as analyzer noise figure gain and noise figure uncertainty and match Default noise figure settings offer simultaneous noise figure and gain measurements By using Table view several measurements including Noise Figure Noise Factor Y Factor Gain Phot Pcold and Teffective can be viewed simultaneously in tabular form The NFA Series is more than a dedicated noise figure analyzer Additi...

Страница 15: ...w keysight com manuals N8976B Each manual is described below Getting Started Guide Describes analyzer features in detail In addition this manual covers unpacking and setting up the analyzer analyzer features and information on options and accessories and what to do if you have a problem Specifications Guide Documents specifications safety and regulatory information Instrument Messages Includes ins...

Страница 16: ... and low distortion levels allow measurements to be made while taking advantage of the full dynamic range of the spectrum analyzer AC Probe Low Frequency The Keysight 41800A low frequency probe has a low input capacitance and a frequency range of 5 Hz to 500 MHz Broadband Preamplifiers and Power Amplifiers Preamplifiers and power amplifiers can be used with your spectrum analyzer to enhance measur...

Страница 17: ...Hz with 10 dB of insertion loss Power Splitters The Keysight 11667A B C power splitters are two resistor type splitters that provide excellent output SWR at 50 Ω impedance The tracking between the two output arms over a broad frequency range allows wideband measurements to be made with a minimum of uncertainty 11667A DC to 18 GHz 11667B DC to 26 5 GHz 11667C DC to 50 GHz Static Safe Accessories 93...

Страница 18: ...pened The power cord is connected to internal capacitors that may remain live for 5 seconds after disconnecting the plug from it s power supply The detachable power cord is the instrument disconnecting device It disconnects the mains circuits from the mains supply before other parts of the instrument The front panel switch is only a standby switch and is not a LINE switch disconnecting device Alwa...

Страница 19: ...ccording to your country s requirements The Keysight part number is 1420 0356 The manufacturer s part number is CR2032 You can return the battery to your nearest Keysight Technologies Sales and Service office for disposal if required Refer to Contacting Keysight Technologies for a list of Keysight Technologies Sales and Service offices Always use the three prong ac power cord supplied with this pr...

Страница 20: ...tection Conductive table mat and wrist strap combination Conductive floor mat and heel strap combination Both types when used together provide a significant level of ESD protection Of the two only the table mat and wrist strap combination provides adequate ESD protection when used alone To ensure user safety the static safe accessories must provide at least 1 megohm of isolation from ground Figure...

Страница 21: ... to an analyzer connector momentarily short the center and outer conductors of the cable together Personnel should be grounded with a 1 megohm resistor isolated wrist strap before touching the center pin of any connector and before removing any assembly from the analyzer Be sure that all analyzers are properly earth grounded to prevent build up of static charge For Additional Information about ESD...

Страница 22: ...adjust and test the analyzer They include the following Calibration Application Software Front End Controller Troubleshooting Kit USB Keyboard and Mouse USB Storage Device Test Equipment Calibration Application Software Information regarding the Keysight X Series Signal Analyzer Calibration Application Software can be found at the following web site http www keysight com find calibrationsoftware ...

Страница 23: ...ems it is highly recommended that the N9020 60005 Front End Troubleshooting kit is purchased The Front End Troubleshooting kit lower level items can be purchased individually or as a complete kit with instructions The complete listing of kit components descriptions and part numbers can be found below Keysight Part Keysight Part Number Notes Front End Troubleshooting kit N9020 60005 Front End Troub...

Страница 24: ...keyboard and mouse sold for the instrument These can be purchased as USB Storage Device The main reason why a USB storage device will be needed is to backup calibration data when the hard drive in an instrument needs to be replaced installing instrument software upgrades and installing new option licenses Recommended size is 2 gigabytes minimum to allow storing at least one instrument software ins...

Страница 25: ...l 30 dBc Amplitude range 40 dBm to 13 Amplitude resolution 0 02 VSWR 20 GHz 1 6 1 31 GHz 1 8 1 E8257D Option 567 1EA 1EU 1E1 Option 007 Analog Ramp Sweep required for Frequency Response Adjustments For Adjustments 83630A B L Option 001 008 83640A B L Option 001 008 83650A B L Option 001 008 PSGc A P T Microwave Signal Generator 2 only required for Third Order Intermodulation and Gain Compression F...

Страница 26: ...257D Options UNR UNX or UNY 8665B for Freq Resp Phase Noise 30 kHz test only PSGc Options UNR UNX or UNY A P Function Generator Frequency 9 kHz to 300 kHz Amplitude Resolution 0 1 mv Harmonic Distortion 35 dBc 33250A 33120A Option 001 A P Counters Universal Counter Frequency 10 MHz Gate time 10 to 100 seconds Must be capable of measuring signal at 7 dBm 0 5 Vrms 53230A 53131A 53132A A P T Meters D...

Страница 27: ...mplitude Range 30 to 20 dB Zero Set 50 nW Zero Drift 10 nW Measurement Noise 110 nW Cal Factor Uncertainty 3 0 VSWR 50 MHz to 100 MHz 1 15 1 100 MHz to 2 GHz 1 10 1 2 GHz to 12 4 GHz 1 15 1 12 4 GHz to 18 GHz 1 20 1 18 GHz to 26 5 GHz 1 25 1 Input Connector 3 5 mm m N8485Ae N8485A CFTe 8485Ae A P Millimeter Power Sensor for N8976B Frequency Range 50 MHz to 50 GHz Amplitude Range 30 to 20 dBm Zero ...

Страница 28: ... P26 only Frequency Range 50 MHz to 26 5 GHz Amplitude Range 70 to 20 dBm Zero Set 50 pW Zero Drift 4 pW Measurement Noise 4 pW Cal Factor Uncertainty 3 0 VSWR 50 MHz to 100 MHz 1 15 1 100 MHz to 2 GHz 1 10 1 2 GHz to 12 4 GHz 1 15 1 12 4 GHz to 18 GHz 1 20 1 18 GHz to 26 5 GHz 1 25 1 Input Connector 3 5 mm m 8485De A P Power Sensor Cable 2 required 11730A A P T Standards Frequency Standard Freque...

Страница 29: ...ion 003 8491B Option 003 P 6 dB Fixed Attenuator Frequency 50 MHz Loss 6 dB nominal VSWR at 50 MHz 1 05 1 Connector Type N m f 8491A Option 006 H33g 8491B Option 006 H33g P 6 dB Fixed Attenuator 2 required Frequency 50 MHz to 3 6 GHz Loss 6 dB nominal VSWR at 50 MHz 1 10 1 Connector 3 5 mm m f 8493C Option 006 A 10 dB Fixed Attenuator Frequency 50 MHz Loss 10 dB nominal VSWR at 50 MHz 1 05 1 Conne...

Страница 30: ...tor Type N f 11667A A P Microwave Power Splitter Frequency 50 MHz to 26 5 GHz VSWR 10 MHz to 3 GHz 1 22 1 3 GHz to 26 5 GHz 1 22 1 Tracking Error 0 40 dB Connector 3 5 mm f 11667B A P Millimeter Power Splitter for N8976B Frequency 50 MHz to 50 GHz VSWR 50 MHz to 18 GHz 1 29 1 18 GHz to 26 5 GHz 1 20 1 26 5 GHz to 40 GHz 1 50 1 40 GHz to 50 GHz 1 65 1 Tracking Error 0 40 dB Connector 2 4 mm f 11667...

Страница 31: ... Cables 3 5 mm m to 3 5 mm m 2 required Frequency DC to 26 5 GHz Length 92 cm 36 in Insertion Loss 2 dB VSWR DC to 18 GHz 1 25 1 18 GHz to 26 5 GHz 1 35 1 11500E 8120 4921 A P 2 4 mm m to 2 4 mm f N8976B Frequency DC to 50 GHz Length 1 m Insertion Loss 26 GHz 4 dB 40 GHz 5 dB 50 GHz 6 dB VSWR 26 5 GHz 1 30 1 40 GHz 1 40 1 50 GHz 1 55 1 8120 6164 A P Type N 2 required Frequency 10 MHz to 8 GHz Prec...

Страница 32: ...Pass 3 dB frequency 13 0 GHz 60 dB Rejection 16 74 GHz VSWR 1 35 1 RLC F 30 12 4 RF P Adapters Type N f to Type N f Frequency DC to 18 GHz VSWR 1 13 1 1250 1472 P Type N m to Type N m Frequency DC to 18 GHz VSWR 1 13 1 1250 1475 P Type N f to BNC m Frequency DC to 1 3 GHz VSWR 1 13 1 1250 1477 P T Type N m to BNC m Frequency DC to 1 3 GHz VSWR 1 13 1 1250 1473 P T Type N m to BNC f Frequency DC to...

Страница 33: ...50 1236 A P BNC f to SMA m Frequency DC to 1 3 GHz 1250 1200 A P BNC f to Dual Banana 1251 2277 A P 3 5 mm f to Type N m Shipped with the 8485A for adapting to the Power Reference Only to be used for power sensor cal 08485 60005 A P 2 4 mm f to Type N m Shipped with the 8487A for adapting to the Power Reference Only to be used for power sensor cal 08487 60001 A P Type N Tee 1250 0559 P Optional Eq...

Страница 34: ...r from Keysight to be used with the N7800A series applications order with Option 1A7 The 1A7 option provides an ISO17025 calibration and includes calibration data When re calibrating your STD or CFT Power Sensor for use with the N7800A series applications we recommend the Keysight ISO17025 calibration f The step attenuators should be permanently joined via the 11716A Interconnect Kit as shown in t...

Страница 35: ... characterization is performed Table 1 2 1 dB Step Attenuator Nominal Attenuation dB Attenuator Section Allowable Uncertainty dB 1 1 dB 2 2 dB 3 4 dB 4 4 dB 0 Off Off Off Off 0 Reference 1 On Off Off Off 0 005 2 Off On Off Off 0 005 3 On On Off Off 0 005 4 Off Off Ona Off 0 005 5 On Off On Off 0 005 6 Off On On Off 0 005 7 On On On Off 0 005 8 Off Off On On 0 005 9 On Off On On 0 005 a TME require...

Страница 36: ...verview Service Equipment You Will Need 60 Off On On Off 0 035 70 On On On Off 0 040 a TME requires that Section 3 be characterized Table 1 3 10 dB Step Attenuator Nominal Attenuation dB Attenuator Section Allowable Uncertainty dB 1 10 dB 2 20 dB 3 40 dB 4 40 dB ...

Страница 37: ... verification tests These tests are done using the N7814A Keysight X Series Signal Analyzer Calibration Application Software Refer to Chapter 16 Post Repair Procedures for a list of post repair adjustments and performance tests based on which hardware has been changed Information regarding the N7814A Keysight X Series Signal Analyzer Calibration Application Software can be found at http www keysig...

Страница 38: ...N8974B http www keysight com manuals N8975B http www keysight com manuals N8976B FAQs instrument software updates documentation and other support information can be accessed from this site To obtain servicing information or to order replacement parts contact the nearest Keysight office listed in Table 1 4 In any correspondence or telephone conversations refer to the instrument by its model number ...

Страница 39: ...40 United States 1 800 829 4444 Asia Pacific Country Phone Number Australia 1 800 629 485 China 800 810 0189 Hong Kong 800 938 693 India 1 800 112 929 Japan 0120 421 345 Korea 080 769 0800 Malaysia 1 800 888 848 Singapore 1 800 375 8100 Taiwan 0800 047 866 Other AP Countries 65 6375 8100 Europe and Middle Country Phone Number Austria 0800 001122 Belgium 0800 58580 Finland 0800 523252 France 0805 9...

Страница 40: ...logies Luxembourg 32 800 58580 Netherlands 0800 0233200 Russia 8800 5009286 Spain 0800 000154 Sweden 0200 882255 Switzerland 0800 805353 Opt 1 DE Opt 2 FR Opt 3 IT United Kingdom 0800 0260637 For other unlisted countries http www keysight com find contactus Europe and Middle Country Phone Number ...

Страница 41: ...nt and the second provides the instrument s serial number The serial number has two parts the prefix two letters and the first four numbers and the suffix the last four numbers Refer to the following figure Figure 1 2 Example Serial Number The first two letters of the prefix identify the country in which the unit was manufactured The remaining four numbers of the prefix identify the date of the la...

Страница 42: ... message appears on screen in spans 10 MHz Analyzer will not complete boot up sequence to signal analyzer mode Failure descriptions that will most likely increase repair time Analyzer broken Analyzer will not make accurate measurements Signal drifts If you have recorded any error messages that appeared on the analyzer display or have completed a Functional Test or Performance Verification Test or ...

Страница 43: ... from moving in the carton If packing foam is not available the best alternative is S D 240 Air Cap from Sealed Air Corporation Hayward California 94545 Air Cap looks like a plastic sheet filled with 1 1 4 inch air bubbles Use the pink colored Air Cap to reduce static electricity Wrapping the equipment several times in this material should both protect the equipment and prevent it from moving in t...

Страница 44: ...44 Keysight NFA Series Noise Figure Analyzers Service Guide Overview How to Return Your Instrument for Service ...

Страница 45: ...rocess flow on page 49 Potential Problems During Boot Process on page 52 Yellow Standby LED Does Not Illuminate on page 52 Green Power On LED Does Not Illuminate on page 54 Fan s Are Not Operating on page 56 No Keysight Splash Screen Displayed on page 58 Instrument Hangs at the Keysight Splash Screen on page 59 PCI Enumeration Error on page 59 Instrument Cannot Completely Load or Run the Operating...

Страница 46: ...Mode Preset key 6 Is the measurement being performed and the results that are expected within the specifications and capabilities of the instrument Refer to the specifications book for specifications 7 In order to meet specifications the instrument must be aligned Press System Alignments Align Now Align Now All The diagnostic tests should all pass If the instrument displays a failure during these ...

Страница 47: ...that did not preload during the original boot that measurement application will preload at that time When this occurs the mode switching time will take longer Once the application is loaded all subsequent mode switches will be much faster If the user does not want the measurement applications to preload during the application boot process select the Configure Applications icon on the desktop You m...

Страница 48: ...48 Keysight NFA Series Noise Figure Analyzers Service Guide Boot Up and Initialization Troubleshooting Instrument Boot Up Process Figure 2 1 Configure Application ...

Страница 49: ...tion in this chapter 5 The Keysight Technologies splash screen is displayed in white font on a dark background for 5 10 seconds after the analyzer is turned on If the Keysight Technologies logo is not displayed refer to the No Keysight Splash Screen Displayed section in this chapter If the instrument hangs at the Keysight Technologies splash screen refer to the Instrument Hangs at the Keysight Spl...

Страница 50: ...ore the analyzer begins to sweep A screen with a black background appears and the alignment progress is shown in a gray box The number of alignments is dependent on which hardware options are present If an alignment fails refer to the Fails an Initial Alignment section in this chapter 11 If any of the initial alignments fail check the alignment history for troubleshooting hints The instrument alig...

Страница 51: ...Keysight NFA Series Noise Figure Analyzers Service Guide 51 Boot Up and Initialization Troubleshooting Instrument Boot Up Process Figure 2 2 Typical Instrument Sweep at Power up ...

Страница 52: ...pply Assembly When the Standby LED does not come on it could be due to any one of these assemblies This procedure will help to determine which one is the cause If the instrument turns on and operates properly but the yellow Standby LED does not work then all that will need to be done is to trace where the control signal for the LED is being lost using the routing information in the preceding parag...

Страница 53: ...e front panel Standby LED back to the A4 CPU board are not at fault replace the A4 CPU board If no Replace the A6 Power Supply assembly All DC power supplies come from the A6 Power Supply assembly However the most convenient measurement location for all the DC supplies is the A7 Midplane All power supply LED s are accessible once the instrument cover has been removed Before replacing the power sup...

Страница 54: ...en all that will need to be done is to trace where the control signal for the LED is being lost using the routing information in the preceding paragraph 1 The Power On LED will only turn on when the instrument is connected to an AC source that has a voltage level and frequency of that specified for the instrument and the front panel On Off button has been pressed Before proceeding verify that thes...

Страница 55: ...d to step 6 If no After verifying that the connections from the front panel On Off button back to the A4 CPU board are not at fault replace the A4 CPU board 6 Do all of the green power supply LEDs along the top of the A7 Midplane board come on If yes After verifying that the connections from the front panel On Off button back to the A4 CPU board are not at fault replace the A4 CPU board If no Repl...

Страница 56: ...Illuminate section before proceeding 1 The instrument fans will only turn on when the instrument is connected to an AC source that has a voltage level and frequency of that specified for the instrument and the front panel On Off button has been pressed Before proceeding verify that these requirements are being met Refer to the instrument rear panel for these requirements 2 Remove the AC power cord...

Страница 57: ...tage at both of the fan connectors J6 J7 on the A8 Motherboard Both connectors have three pins The outer conductors on both connectors are the FAN_P supply and the center conductors are FAN_N The voltage between FAN_P and chassis ground should be between 7 and 15 VDC on both connectors Does the A8 Motherboard fan connector for the fan s that do not work have the required voltage level If yes Repla...

Страница 58: ...s on page 389 in this manual 2 Remove the MP7 Top Brace Refer to Chapter 15 Assembly Replacement Procedures on page 389 in this manual 3 With the AC power applied and the On Off button turned on verify that all of the power supply voltages are at their proper level This can easily be done by viewing the power supply LEDs on the back side of the A7 Midplane board See A7 Midplane Assembly Troublesho...

Страница 59: ...7 Midplane board See A7 Midplane Assembly Troubleshooting on page 315 of this manual Are all of the power supply voltages at the proper level If yes After verifying that the connections from the A7 Midplane board to the A4 CPU board are not at fault replace the A4 CPU board If no After verifying that the connections between the A6 Power Supply the A7 Midplane board and the A8 Motherboard are all m...

Страница 60: ...Keysight Recovery System If yes Run the Keysight Recovery System by referring to the Disk Drive Recovery Process on page 300 If this does not correct the problem replace the A5 Hard Disk Drive If no Replace the A5 Hard Disk Drive Troubleshooting a Blank Display This section is intended to troubleshoot a display system problem that would cause the internal LCD to be blank It is assumed that the res...

Страница 61: ... video controller is located on the A4 Processor assembly The video signals that the controller outputs are LVDS As described above these signals are routed to the touch screen display via the A7 Midplane Board A8 Motherboard and A1A2 Front Panel Interface board On the A1A2 Front Panel Interface board the LVDS signals are buffered and then sent to the touch screen display via the A1W1 Flex circuit...

Страница 62: ...ing an external USB keyboard and mouse access the alignment history which can be found in a text file at E AlignDataStorage AlignmentHistory txt You will find the most current alignment information at the bottom of this file Look for the failed alignments From the windows task bar you can click Edit Find and type in FAILED and search for a failure Note that the information in the history file usua...

Страница 63: ...l reference A16 Reference Dither Level Algorithm 4 measurements A3 Digital IF AIF LC Wide Prefilter Passband Tuning Algorithm Adjusts the LC prefilter centering with the prefilter BW set to about 1 12 MHz Uses 322 5 MHz Comb Calibrator on the A IF A2 Analog IF AIF LC Wide Prefilter Passband Fine Tuning Algorithm A2 Analog IF AIF LC Narrow Prefilter Passband Tuning Algorithm Adjusts the LC prefilte...

Страница 64: ... low gain 0 dB paths In normal instrument operation these two states can be controlled by the user interface key called Swept IF Gain Uses the Comb calibrator on the A IF A2 Analog IF LO Power Alignment Algorithm Measure max LO power then backs off for each band A13 Front End Assembly or A15 Front End Controller AIF Variable Attenuator Algorithm Measures the gain in all settings of the A IF 1 dB s...

Страница 65: ...Reference A9 and A10 Input attenuators Preselector Two Point Tuning Algorithm Aligns the YTF preselector centering near the maximum and minimum frequency points of the YTF Uses the high band preamp noise as stimulus signal A12 YTF Preselector or A15 Front End Controller or All Low Band A13 Front End High Band Nominal Path System Gain Algorithm Anything in Band 1 signal path 4800 MHz calibrator on ...

Страница 66: ...Hz Span 1 MHz Peak Search If the analyzer is functioning correctly in low band the 50 MHz calibrator level should be 25 dBm 2 dB See the figure below Is the signal level correct If yes The analyzer low band path is functioning properly at least at 50 MHz If no Refer to Chapter 4 RF Section Troubleshooting N8973B 74B 75B Analyzers in this manual It is possible that other input frequencies 3 6 GHz c...

Страница 67: ...earch If the analyzer is functioning correctly in high band the 4 8 GHz calibrator level should be 28 dBm 2 dB See the figure below Is the signal level correct If yes The analyzer high band path is functioning properly at least at 4 8 GHz If no Refer to Chapter 4 RF Section Troubleshooting N8973B 74B 75B Analyzers in this manual It is possible that other input frequencies 3 6 GHz could have an amp...

Страница 68: ...68 Keysight NFA Series Noise Figure Analyzers Service Guide Boot Up and Initialization Troubleshooting Signal Level Verification ...

Страница 69: ...ng has happened Events are sub divided according to their severity into Error Warning or Advisory categories The sub divisions are described in more detail in the section Event and Condition Categories on page 70 A Condition is a state of the instrument which is characterized by a Detection event and a Clearing event Conditions may be Errors or Warnings Event and Condition messages appear in the S...

Страница 70: ... Error messages are logged in the error queues If the error is a condition both the Detected and Cleared events are logged Warnings Warning messages appear when a requested operation has completed successfully but there are modifications and or side effects For example if you requested too high a stop frequency then Data out of range is displayed and the analyzer sets itself to the highest availab...

Страница 71: ...ppear when you attempt to access a function that is not available This could be a grayed out front panel key or an inappropriate SCPI command There are two types of grayout messages Benign and Forced 1 Benign the requested function is not available because it does not make sense with the current instrument settings Changing it does not affect the current measurement For example setting the number ...

Страница 72: ...t Panel queue Front Panel Event History Displayed as a list in the History tab of the Status Dialog The History list shows all the events that have occurred since the instrument was turned on up to a maximum of 100 messages When an error situation is caused by a command sent over a remote interface the resulting messages are logged in the queue for that interface For convenience they are also logg...

Страница 73: ...queues Send CLS command to the desired interface Clears messages in the queue for this particular interface only Table 3 3 Summary of Event Reporting Modes Event Type SCPI Error Queues Front Panel History Queue Status Panel Display Error Warning Advisory Event Logged Logged Displayed via Message Box Error Warning Condition Detected Start Event Loggeda Loggeda Displayed via Message Box Error Warnin...

Страница 74: ...cy is kept constant Therefore the span is limited by the frequency range of the instrument Allowable Start Frequency exceeded for the current span When rotating the knob or step up down keys to change the Start frequency the value of the Span is kept constant Therefore the start frequency is limited by the frequency range of the instrument Allowable Stop frequency exceeded for the current span Whe...

Страница 75: ... complete before pressing any buttons Demod Time is not available in Zero Span The Demod Time function is not available in zero span because in zero span we are always demodulating Detector X changed due to physical constraints You have selected more detectors than the instrument hardware can implement An existing detector selection has been changed to allow the current detector choice to be selec...

Страница 76: ...ll run but check setup frequencies are correct before continuing The IF fixed freq should be greater than the RF Stop freq for an upconverter swept LO setup Use the graph icon on the DUT setup form to clarify the setup required IF Start freq should be greater than LO Fixed freq The setup frequencies break the rules for an upconverter measurement The measurement will still run but check setup frequ...

Страница 77: ...easurement The measurement will still run but check setup frequencies are correct before continuing The LO Stop freq should be greater than the RF Stop freq s for a DSB for DSB measurements the setup uses LSB values downconverter swept LO setup Use the graph icon on the DUT setup form to clarify the setup required Low pass filter set to OFF Turning on any band pass filter will turn off low pass fi...

Страница 78: ...fixed freq s for an USB downconverter fixed LO setup Use the graph icon on the DUT setup form to clarify the setup required RF Start freq should be greater than LO Start freq The setup frequencies break the rules for a downconverter measurement The measurement will still run but check setup frequencies are correct before continuing The RF start freq should be greater than the LO Start freq s for a...

Страница 79: ...ate View Sweep Time in the Gate menu When in Gate View you use Gate View Sweep Time rather than Sweep Time to control the Gate View window User Cal valid Apply Cal from Meas Setup menu The measurement setup has changed such that the current cal data can be applied to the results To apply the cal press Meas Setup Cal Setup Apply Calibration A new cal can be performed if required Message Description...

Страница 80: ...s are defined by the SCPI standard In the X Series sub messages are often attached to add additional information to help you better understand the event being reported For example error 221 is defined as Settings Conflict but in the X Series you will often see a longer message appended to error 221 such as Settings Conflict Function not available in Zero Span This helps you understand the exact ca...

Страница 81: ...e instrument has detected an off to on transition in its power supply Err Message Verbose Correction Information 400 Query Error There was a problem with a query command The exact problem cannot be specifically identified 410 Query INTERRUPTED Some condition caused an INTERRUPTED query to occur For example a query was followed by DAB or GET before a response was completely sent 420 Query UNTERMINA...

Страница 82: ...nication with the network driver failed 310 System error Failed to initialize the PTP clock to current time Failure communicating with the DMC libraries PTP controller 310 System error Failed to instantiate the PTP ordinary clock Failure in the starting up the DMC libraries PTP controller 310 System error feature feature code not licensed The specified feature for example N9073A TR2 is not license...

Страница 83: ...eware 310 System error The PTP ordinary clock reported a configuration error Failure in execution of the DMC libraries PTP controller 310 System error The Trigger alarm delayed LAN event was not scheduled due to an existing pending event Delayed LAN events cannot occur too close together within 20 ms 310 System error The Trigger alarm delayed LAN event was not scheduled due to a conflict with an e...

Страница 84: ...tified 360 Communication error SNS data read failure Disconnect then reconnect SNS The Keysight Smart Noise Source connected to the instrument has failed to be read by the application Please disconnect and reconnect the SNS If this continues to fail then the SNS may have had its EEPROM corrupted or another hardware fault exists Check SNS on another instrument NFA and ESA are also SNS compatible in...

Страница 85: ...e Input Z is set based on the probe type It cannot be changed manually 221 Settings conflict A legal command was received but it could not be executed due to the current device state 221 Settings conflict CSV file format is not available in this measurement You cannot load or save base instrument traces as this is not supported by the Log Plot measurement 221 Settings conflict Q Param cannot be ch...

Страница 86: ... Reference trace for the cancellation has a different range of X axis against the target trace 221 Settings conflict Cannot optimize while user cal in progress Optimize Preselector cannot be performed while a user cal is in progress The user cal performs an optimize preselector prior to taking the noise source on off level results for the cal data 221 Settings conflict Can t Auto Couple Res BW in ...

Страница 87: ...o Std is W CDMA 221 Settings conflict Feature not available in this View Some functionality is available in one View but not in another See the Views under the Mode Measurement View selection This error occurs if you send a SCPI command or push a grayed out key that is not available in the current selected View 221 Settings conflict Feature not supported for selected source You have selected a fea...

Страница 88: ...ource while doing FFTs 221 Settings conflict Fixed marker adjust not available while Marker Function is on If a Marker Function is on for a Fixed marker the marker s reported value is derived from the function Therefore you cannot directly set the X or Y value of a Fixed marker that has a marker function turned on 221 Settings conflict Fixed Marker Y value is not adjustable with Normalize On If No...

Страница 89: ... Sweep Type setting If the Gate is On and you have the FFT Sweep Type manually selected then the Gate Method cannot be selected 221 Settings conflict Gate not available with external Tracking Source The Gate functions are unavailable when Source Mode is Tracking with an external source This is because the Gate circuitry is used to sync the external source 221 Settings conflict Gate not available w...

Страница 90: ...lative to itself A marker must be set relative to another marker not to itself 221 Settings conflict Marker Count is not available when Gate on The marker count function cannot be used while you have gating turned on 221 Settings conflict Marker Function is not available for a Fixed marker If a Marker is a Fixed type marker the marker s value does not change from when it first became fixed You can...

Страница 91: ...ot available in some Modes or in some measurements for example the SA measurement 221 Settings conflict Must apply Amplitude Correction to make this unit available These special units only apply when you are doing antenna measurements so you must have a correction that includes Antenna Units enabled 221 Settings conflict No meas frequencies are above 3 6 GHz Optimize Preselector can only be perfor...

Страница 92: ... is set to Fixed Change the Freq Mode to Fixed 221 Settings conflict Param only available when Frequency Mode is Fixed SCPI only message This parameter is only available when the Freq mode is set to Fixed Change the Freq Mode to Fixed 221 Settings conflict Param only available when Frequency Mode is Swept SCPI only message This parameter is only available when the Freq mode is set to Swept Change ...

Страница 93: ...al Track is not available when you have selected Zero Span So if Zero Span is entered while in Signal Track is On Signal Track is turned off 221 Settings Conflict Span limited to XXX 221 Settings conflict Span Zoom is not available in Zero Span Span Zoom does not work with a time domain X axis You must select a span greater then 0 Hz 221 Settings conflict Step keys are not available to modify this...

Страница 94: ...1 Settings conflict System Display Settings Annotation is Off This is an override that turns off many of the annotations This is available as a security feature 221 Settings conflict T hot must be greater than T cold The Tcold value set under Meas Setup ENR Tcold needs to be lower than the Thot value currently being set Tcold is often taken as the ambient temperature of the noise source If using a...

Страница 95: ...estart the SA application 221 Settings conflict Auto Scan Time Meas Time do not apply in Stepped Scan Type The Auto Scan Time Meas Time are not available when Scan Type Stepped Scan 221 Settings conflict Auto Scan Time Meas Time do not apply in Stepped Scan Type The Auto Scan Time Meas Time are not available when Scan Type Stepped Scan 221 Settings conflict ClearList Start not available when ScanS...

Страница 96: ...because we are always doing linear sweep 221 Settings conflict QPD EMI Average RMS Average is not allowed You cannot turn on all 3 EMI detectors together You must turn off one of the EMI Detectors before you turn this on 221 Settings conflict Range 0 is turned off as total range points 40001 Max of Total range points is 400000 Reduce Scan Points or increase Step Size in order to turn on that range...

Страница 97: ...d and device 200 Execution error Invalid GSM burst timing A GSM like burst was acquired but its timing is not valid Ensure the correct Burst Type has been selected 200 Execution error Invalid IP address The IP address supplied is either not valid or does not belong to a compatible Signal Generator Please check the IP address and instrument connection and try again 200 Execution error Invalid Marke...

Страница 98: ...lity which uses a different trace format that is incompatible with the version you are running Please check that you are running the most up to date version of the personality 200 Function not available before Marker Zoom is performed Function not available before perform Marker Zoom 200 Must perform Scan before do Search Cannot perform Search as the trace data is empty 200 No marked signal Cannot...

Страница 99: ...D error 215 Arm deadlock The arm source for the initiation of a measurement is set to GET and the following measurement query is received The measurement cannot be started until a GET is received and the GET would cause an INTERRUPTED error 220 Parameter error A problem was found with a program data element The exact problem cannot be specifically identified 221 Settings conflict There are many ty...

Страница 100: ... set a length longer than the maximum 224 Illegal parameter value Gated FFT is not available while Sweep Type is set to Swept The gated FFT function is not available if you have selected the swept type of sweep You must select the FFT sweep type 224 Illegal parameter value Gated LO is not available while Sweep Type is set to FFT The FFT sweep type moves the LO frequency in steps so the gated LO fu...

Страница 101: ...model is always AC coupled You cannot set DC coupling in this analyzer 225 Out of memory There is not enough memory to perform the requested operation 225 Out of memory Insufficient resources to load Mode mode name If you attempt to load a mode via SCPI that will exceed memory capacity the Mode does not load and this message is returned mode name is the SCPI parameter for the Mode in question for ...

Страница 102: ...gal program command or query could not be executed because of a hardware error The exact problem cannot be specifically identified 240 Hardware error See details in Windows Event Log under SA The internal data acquisition system detected a problem at startup and logged the details in the Windows Event Log 241 Hardware missing The operation could not be performed because of missing hardware perhaps...

Страница 103: ...hat were previously saved using the Save Trace feature 250 Mass storage error File filename wrong type Attempt to import a data file that is not the proper type for this operation 250 Mass storage error File filename and instrument version mismatch While opening a file there was a mismatch between file version or model number with instrument version or model number The import still tried to load a...

Страница 104: ...s storage error Sharing violation The process cannot access the file because it is being used by another process 250 Mass storage error Spectrogram must be on to save as Meas Results You must have a Spectrogram on the screen before you can save it Turn on the Spectrogram and try again 250 Mass storage error Too many open files The system cannot open the file 250 Mass storage error Write fault The ...

Страница 105: ...ro syntax error Indicates a syntax error within the macro definition 272 Macro execution error Indicates that a syntactically legal macro program data sequence could not be executed due to some error in the macro definition 273 Illegal macro label Indicates that the macro label defined in the DMC command was a legal string syntax but could not be accepted 274 Macro parameter error Indicates that t...

Страница 106: ...attempt was made to reference a nonexistent variable in a program 284 Program currently running Certain operations dealing with programs may be illegal while the program is running for example deleting a running program might not be possible 285 Program syntax error Indicates that a syntax error appears in a downloaded program The syntax used when parsing the downloaded program is device specific ...

Страница 107: ... error This is a general error that is generated when a problem is found in a command header but no more specific information is available 111 Header separator error An illegal character was found in a command where a separator was expected 112 Program mnemonic too long The command contains a keyword that has more than twelve characters 113 Undefined header The command meets the SCPI syntax requir...

Страница 108: ...ring data A string type of data element was expected but it is invalid for some reason For example an END message was received before the terminal quote character 158 String data not allowed A string data element that you sent is valid but it is not allowed at this point in the parsing 160 Block data error A problem was found with a block data element The exact problem cannot be specifically ident...

Страница 109: ...nce sent with a DDT or DMC command is syntactically invalid 184 Macro parameter error Indicates that a command inside the macro definition had the wrong number or type of parameters Err Message Verbose Correction Information 0 No error The queue is empty Either every error in the queue has been read or the queue was cleared by power on or CLS Err Message Verbose Correction Information ...

Страница 110: ...ned out to three sub registers with summary bits in the main STATus QUEStionable CALibration register each sub register has its own range of error numbers Condition Errors 6 to 34 Calibration Skipped This series of errors corresponds to the bits in the STATus QUEStionable CALibration SKIPped sub register The second column in the table shows the corresponding bit in that register An event with the ...

Страница 111: ...ith these bits they exist only as status bits which can be read with a STATus QUEStionable CALibration event query or a STATus QUEStionable CALibration CONDition query Note that these summary bits summarize the state and history of the event registers at the lower level This is true even for bits in the STATus QUEStionable CALibration condition register This means that The summary bits read by the...

Страница 112: ...TG Alignment Failure E 42 3 RF Alignment Failure E 44 4 IF Alignment Failure E 46 5 LO Alignment Failure E 48 6 ADC Alignment Failure E 50 7 FM Demod Alignment Failure E 52 8 Extended Align Needed Summary status bit only This bit is the summary bit for the STATus QUEStionable CALibration EXT ended NEEDed sub register 54 9 Extended Align Failure Summary status bit only This bit is the summary bit f...

Страница 113: ... 72 indicates that the Input Attenuation not calibrated condition has been detected and error 1072 indicates that failure has been cleared This register is summarized as bit 8 of the STATus QUEStionable CALibration register as described in the section Condition Errors 36 to 64 Calibration Needed or Failed on page 111 Err Bit in status register Message Error or Warning More Information 65 0 unused ...

Страница 114: ...h the DETECTED and CLEARED indicators For example error 71 indicates that the Characterize Preselector Failure has been detected error 1071 indicates that failure has been cleared This register is summarized as bit 9 of the STATus QUEStionable CALibration register as described in the section Condition Errors 36 to 64 Calibration Needed or Failed on page 111 Err Bit in status register Message Error...

Страница 115: ...wer level This is true even for bits in the STATus QUEStionable INTegrity condition register This means that The summary bits read by the STATus QUEStionable INTegrity CONDition query are true if any event bits are set in any of the INTegrity sub registers SIGNal or UNCalibrated The summary bits read by the STATus QUEStionable INTegrity event query are true if any event bit has undergone a false t...

Страница 116: ... is at 5 01 V and I bar is at 5 0 the ADC will be in range but both I and I bar will exceed the voltage limit 141 4 Input Overload RF Preselector Overload Ea The level at the input of the MXE RF Preselector has exceeded tolerances reduce the input level 143 5 unused 145 6 unused 147 7 Insufficient Data E 147 7 Insufficient Data Incr Demod Time E There is insufficient acquisition data to provide ac...

Страница 117: ...ne and nothing in the history queue but there IS an on screen indication and a status bit 159 13 Settings Alert W 159 13 Settings Alert LO may overload IF W If the sweep type is Swept the start frequency of the instrument is less than 10 MHz and you put Swept IF Gain in Manual High then a warning condition is generated and remains in effect as long as this condition exists In some older analyzers ...

Страница 118: ...measurements the impedance and differential settings should be the same on both channels and the attenuation should match within 1 dB 159 13 Settings Alert Parm data mismatch W For Bluetooth the detected parameters did not match the data 159 13 Settings Alert Src pwr ramp ALC range W You have selected a Power Sweep range that exceeds the ability of the external Source to follow without changing me...

Страница 119: ...nnot be detected or the burst is less than 126 microseconds Carrier signal is not actually bursted W CDMA Either the signal being analyzed has insufficient power the rising or falling edges cannot be detected or the burst is less than 126 microseconds W CDMA Cannot synchronize measurement with PRACH channel for Power Control measurement because the signal cannot be found Make sure PRACH is present...

Страница 120: ... of range Check that the LO frequency limits are set correctly and check the entered measurement frequencies and measurement mode 215 6 Sync Error E W CDMA Cannot sync DPCCH pilot Cannot synchronize measurement with DPCCH pilot for Power Control measurement because the pilot signal cannot be found Make sure DPCCH is present in the W CDMA uplink signal and that the slot format and scramble code are...

Страница 121: ...gnal and no active channel is found from composite EVM measurement An active channel must meet the default threshold criteria that it is within 20 dB of the highest power code channel The threshold can be changed using the active set threshold function in the Meas Setup menu In PSA this error was reported as one of the following error numbers 10872 10962 13070 10228 10768 217 7 Demod Error Can t c...

Страница 122: ...l Too Noisy E NADC PDC The valid EVM measurement cannot be performed because the input signal is too noisy GSM EDGE In a GSM measurement indicates that a burst could not be found in a signal that appears noisy In PSA this error was reported as one of the following error numbers 10702 10824 10906 10930 13024 10626 111 221 9 Slot Error E 221 9 Slot error No active slot found E No valid active slot f...

Страница 123: ...ample error 301 indicates a Meas Uncal condition has been detected error 1301 indicates that failure has been cleared This register is summarized as bit 3 of the STATus QUEStionable INTegrity register as described in the section Condition Errors 101 to 199 Measurement Integrity on page 115 Err Bit in status register Message Error or Warning More Information 301 0 Meas Uncal W 303 1 Signal ID on W ...

Страница 124: ...tion If an attenuation setting is selected but has not been calibrated Preamp If set to condition different from current cal settings for example if calibrated with the preamp on turning it off will invalidate the cal Points Changing the number of measured frequency points can make the stored preselector offsets become inaccurate and hence invalidate the calibration This occurs when the following ...

Страница 125: ...e re used for frequencies greater than the table range ENR 311 5 Calibration No ENR data present W No ENR Data ENR 313 6 Source Uncal W 313 6 Source Uncal adj Start Freq or RBW W While using a Tracking Source you must make sure the Start Frequency is high enough to avoid capturing LO feedthrough in the trace This depends on both Start Freq and RBW If you get this message increase the Start Freq or...

Страница 126: ...r Unleveled condition has been detected error 1409 indicates that failure has been cleared This register is summarized as bit 3 of the STATus QUEStionable register as described in the section Condition Errors 601 to 699 Error Summaries on page 128 Condition Errors 501 to 599 Frequency This series of errors corresponds to the bits in the STATus QUEStionable FREQuency register s The second column in...

Страница 127: ... described in the section Condition Errors 601 to 699 Error Summaries on page 128 Err Bit in status register Message Error or Warning More Information 501 0 Source Synth Unlocked E 503 1 Frequency Reference Unlocked E 505 2 2nd LO Unlocked E 507 3 unused 509 4 LO Unlocked E 511 5 unused 513 6 IF Synthesizer Unlocked E 515 7 Calibration Oscillator Unlocked E 517 8 unused 519 9 Demodulation E 521 10...

Страница 128: ... any of the QUEStionable sub registers POWer TEMPerature FREQuency CALibration or INTegrity The summary bits read by the STATus QUEStionable event query are true if any event bit has undergone a false to true transition with the PTRansition filter set or a true to false transition with the NTRansition filter set in any of the QUEStionable sub registers POWer TEMPerature FREQuency CALibration or IN...

Страница 129: ... has been detected error 1721 indicates that condition has been cleared Unless otherwise noted in the Error or Warning column below these are status bits only with no corresponding error message or number 619 9 Integrity status bit only This bit is the summary bit for the STATus QUEStionable INTegrity sub register 621 10 unused 623 11 unused 625 12 unused 627 13 unused 629 14 unused Err Bit in sta...

Страница 130: ...01 indicates that condition has been cleared This register is summarized as bit 4 of the STATus QUEStionable register as described in the section Condition Errors 601 to 699 Error Summaries on page 128 715 7 unused 717 8 Paused status bit only 719 9 Source Sweeping status bit only The Source Sweeping bit is used to indicate various conditions depending on the Mode of operation In the List Sequence...

Страница 131: ...ges Condition Messages 803 1 unused 805 2 unused 807 3 unused 809 4 unused 811 5 unused 813 6 unused 815 7 unused 817 8 unused 819 9 unused 821 10 unused 823 11 unused 825 12 unused 827 13 unused 829 14 unused Err Bit in status register Message Error or Warning More Information ...

Страница 132: ...132 Keysight NFA Series Noise Figure Analyzers Service Guide Instrument Messages Condition Messages ...

Страница 133: ...s chapter RF Section Description on page 134 Troubleshooting on page 142 Quick Check to Verify the Low Band Signal Path on page 142 Troubleshooting a Low Band Problem on page 146 Quick Check to Verify High Band RF Path 1 on page 169 Troubleshooting a High Band Problem on page 173 High Band Preamp Standard Option P07 P26 on page 198 High Band Mixing Equations on page 198 Each section describes how ...

Страница 134: ...the signal analyzer center frequency is tuned 1 Low band RF path is used when the input frequency is 3600 MHz 2 High band RF path 1 is used when the input frequency is 3 6 GHz to 13 6 GHz 3 High band RF path 2 is used when the input frequency is 13 6 GHz to 26 5 GHz The RF section is designed to convert RF input signals to an intermediate frequency IF that is present at the RF output of the A13 Fr...

Страница 135: ...N8973B 74B 75B Analyzers RF Section Description The RF section is comprised of the following major assemblies A9 Input Attenuator A A10 Input Attenuator B A11 Low Band Switch Assembly A12 YTF Preselector A14 L O Synthesizer Assembly A13 RF Front End Assembly A15 Front End Control Assembly ...

Страница 136: ...termediate frequency of 322 5 MHz 5122 5 MHz 1st I F 4800 MHz 2nd L O The 2nd I F output is at A13J7 on the A13 RF Front End Assembly This signal path is used for all frequency range options when the RF input frequencies are 3600 MHz The control voltages and biasing for these assemblies come from the A15 Front End Control assembly 2 RF input frequencies from 3 6 GHz to 13 6 GHz go through high ban...

Страница 137: ...s biased by the A15 Front End Control Assembly The signal then routes to the A12 YTF Preselector before going to the A13 RF Front End Assembly The input switch in the RF Front End Assembly routes the RF input signal to Mixer 3 The RF input signal is then mixed with the 1st L O from the A14 L O Synthesizer Assembly in Mixer 3 to a 1st intermediate frequency of 322 5 MHz The LO is doubled at tuned f...

Страница 138: ... input frequencies from 9 kHz to 3 59 GHz RF Output to A13 RF Front End Assembly Switch RF input frequencies from 3 6 GHz to 26 5 GHz Microwave RF Output to A12 YTF Preselector Optional high band preamplifier which has a typical gain of 30 dB and a noise figure from 9 12 dB up to 18 GHz A12 YTF Preselector The YTF Preselector is used for input frequencies greater than 3 6 GHz Signals less than 3 6...

Страница 139: ...uency of the analyzer and which high band mixer is being used on the A13 RF Front End assembly The output power is 13 to 18 dBm In order to maximize the conversion efficiency sufficient L O power must be supplied to the mixer in the A13 RF Front End Assembly from this assembly Table 4 1 X Series Signal Analyzers Analyzer Center Frequencya 1st L O A14J740 Desired 1st L O Harmonic Mixer 2 or 3 5 GHz...

Страница 140: ...his assembly contains the following circuits Input Low pass filter RF input signals 3 6 GHz Low Band Limiter Optional Low Band Preamplifier RF Mixer 1 RF input signals 3 6 GHz 1st L O Sub system 3 8 GHz to 8 7 GHz 1st I F Amplifier 5122 5 MHz I F Band pass filter 5122 5 MHz I F Low pass filter 5122 5 MHz Mixer 2 RF input signals 3 6 GHz to 13 599 GHz Microwave Input Amplifier Mixer 3 RF input sign...

Страница 141: ...escription From To RF Input 9 kHz to 3 59 GHz RF Input A11J2 Low Band Switch A13J2 Microwave Input 3 6 GHz to 26 5 GHz U wave RF Input YTF Output A13J9 E cal Input Cal Signal Port A16J705 Ref Bd A13J6 1st L O Input 3 8225 to 8 7225 GHz 1st L O A14J40 Synth Bd A13J4 2nd L O Input 4 8 GHz 2nd L O A16J702 Ref Bd A13J1 I F Output 322 5 MHz I F Signal A13J7 A2J100 AIF or A15J902 EFEC To Band Pass Filte...

Страница 142: ... reference for troubleshooting by pressing MODE MEAS Spectrum Analyzer OK Mode Preset Input Output RF Calibrator 50 MHz on the analyzer Now press FREQ 50 MHz Span 1 MHz Peak Search The 50 MHz reference signal should measure 50 MHz 25 dBm 2 dB on the analyzer display If the power level is within tolerance the low band path is functioning correctly at 50 MHz To verify the high band path go to Quick ...

Страница 143: ... Analyzers Service Guide 143 RF Section Troubleshooting N8973B 74B 75B Analyzers Troubleshooting Disconnect the W15 or W36 cable from A13J7 on the RF Front End Assembly 1 322 5 MHz output See Figure 4 2 Figure 4 2 W15 or W36 Location ...

Страница 144: ... analyzer settings as in Figure 4 3 Figure 4 3 322 5 MHz Intermediate Frequency If this power level is correct the RF assembly from the A9 50 MHz Reference signal input port to A13J7 322 5 MHz I F Output is operating correctly using a 50 MHz input calibrator signal Reconnect the W15 or W36 cable to A13J7 Flatness issues or power level problems at other input frequencies below 3600 MHz may exist Th...

Страница 145: ...l Be sure the 50 MHz calibrator is turned on Input Output RF Calibrator 50 MHz when verifying the performance 1 A16 Reference Assembly 2 A14 L O Synthesizer 3 A15 Front End Control Assembly 4 A9 Input Attenuator A 5 A10 Input Attenuator B 6 A11 Low Band Switch 7 A12 YTF Preselector 8 A13 RF Front End Assembly Figure 4 4 Remove the Side Chassis In order to gain access to the front end components re...

Страница 146: ...973B 74B 75B Analyzers Troubleshooting Troubleshooting a Low Band Problem 1 Reference Assembly Verification Remove cable W19 from A9 Input Attenuator A 1 and measure the 50 MHz calibrator signal on the cable end with a functioning Spectrum Analyzer Refer to Figure 4 5 Figure 4 5 W19 Location ...

Страница 147: ...zers Troubleshooting If the Reference assembly calibrator is functioning properly the 50 MHz calibrator signal will measure 50 MHz at 25 dBm 3 dB See Figure 4 6 If this level is incorrect the Reference assembly is most likely defective Reconnect W19 at A9 Input Attenuator A Figure 4 6 50 MHz Calibrator Signal ...

Страница 148: ...Troubleshooting N8973B 74B 75B Analyzers Troubleshooting 2 L O Synthesizer Assembly Verification Press the following keys on the analyzer FREQ 1 GHz Zero Span Refer to Figure 4 7 Disconnect cable W4 at A14J740 of the L O Synthesizer Assembly 1 Figure 4 7 W4 and W6 Location ...

Страница 149: ...ng N8973B 74B 75B Analyzers Troubleshooting Connect the functioning Spectrum Analyzer and appropriate high frequency cable and connector to A14J740 Adjust the functioning Spectrum Analyzer to measure a signal at 6122 5 MHz at 16 dBm 4 dB as seen in Figure 4 8 Figure 4 8 Measure 1st L O ...

Страница 150: ...oning spectrum analyzer to measure a signal at 4 800 GHz at 4 5 dBm 2 dB See Figure 4 9 Figure 4 9 4 800 GHz Signal at A14J200 If this power level is incorrect the most probable cause is the A16 Reference Assembly If this level is correct and yet the signal previously measured at A14J740 is incorrect the most probable cause is the A14 L O Synthesizer Assembly Reconnect W4 cable to A14J740 Reconnec...

Страница 151: ...Preselector Optional Low Band Preamplifier Optional High Band Preamplifier and the RF Front End Assembly The control logic should be verified going to each assembly while the Front End Troubleshooting board is connected Turn off the instrument Connect the E4410 60115 Front End Troubleshooting board to the A15 Front End Control Assembly as shown in Figure 4 10 and Figure 4 11 Even though the YTF Pr...

Страница 152: ...ht NFA Series Noise Figure Analyzers Service Guide RF Section Troubleshooting N8973B 74B 75B Analyzers Troubleshooting Figure 4 10 RF Front End Troubleshooting Board Figure 4 11 RF Front End Troubleshooting Board ...

Страница 153: ... is up for Attenuator A DS10 under J4 should be on if the 25V supply is up for Attenuator B If any of the power supply LED s are not turned on see Chapter 2 Boot Up and Initialization Troubleshooting 4 Input Attenuator A Control Logic Verification Press AMPTD Attenuation Mech Atten 0 dB All the attenuation LED s on the Front End Troubleshooting board should be off except for DS9 and DS10 25V suppl...

Страница 154: ...154 Keysight NFA Series Noise Figure Analyzers Service Guide RF Section Troubleshooting N8973B 74B 75B Analyzers Troubleshooting Figure 4 12 Front End Troubleshooting Board Attenuation LEDs ...

Страница 155: ...tting for RF Coupling is AC mode Verify the AC Select LED DS14 is illuminated at this time Set Input Output RF Coupling to DC DS14 turns off DS11 DC Select yellow LED should illuminate Switch the RF Coupling back to AC If the LED s illuminate correctly the switch control logic to Input Attenuator A from the A15 Front End Control Assembly is correct If the LED s are not illuminating as expected the...

Страница 156: ...d Troubleshooting board according to Table 4 4 Set the input attenuator back to 10 dB by pressing AMPTD Attenuation Mech Atten 10 dB on the analyzer If the LED s illuminate correctly the switch control logic for the input attenuators from the A15 Front End Control Assembly is correct If the LED s are not illuminating as expected the most probable cause is the A15 Front End Control Assembly Table 4...

Страница 157: ... DVM positive lead to one of the In1A test points and the negative lead to the bottom of R46 blue resistor near the bottom on the Front End Troubleshooting board Verify the voltages in Table 4 5 Press Center Frequency 5 GHz on the analyzer Verify the voltages in Table 4 6 If the voltages are not correct the most probable cause is the A15 Front End Control Assembly Table 4 5 In1A 9 85 In2A 9 85 In1...

Страница 158: ...e YTF characterization press System Alignments Advanced Characterize Preselector To further test the YTF control current select Amps on the DVM and place the positive lead of the DVM on one of the YTF Coil Current P8 pins and the other DVM lead to the other Coil Current pin In order to properly measure the preselector tune output from the A15 Front End Control Assembly the following items are requ...

Страница 159: ...e A15 Front End Control Assembly Perform the YTF characterization press System Alignments Advanced Characterize Preselector and re check the control current at various center frequencies Table 4 8 YTF Tune Current Center Frequency GHz Control Current mA Tolerance mA 5 0 106 20 10a 215 25 15a 324 30 20a 430 40 26a 560 50 a N8975B 76B Tolerances should be used as a guideline The true test is whether...

Страница 160: ...S5B Sets E atten to 2 dB preamps off E atten 2 dB 9 83 0 5 S6A Sets E atten to 1 dB preamps off E atten 1 dB 9 67 0 5 S6B Sets E atten to 1 dB preamps off E atten 1 dB 9 83 0 5 S7A Sets E atten to 2 dB preamps off E atten 2 dB 9 67 0 5 S7B Sets E atten to 2 dB preamps off E atten 2 dB 9 83 0 5 S8A Sets E atten to 20 dB preamps off E atten 20 dB 9 67 0 5 S8B Sets E atten to 20 dB preamps off E atte...

Страница 161: ...l boot up process to Spectrum Analyzer mode S14B Sets path to either band 1 2 mixer or band 3 4 mixer CF 5 GHz CF 20 GHz 9 67 9 67 0 5 VCC1 Voltage always on 4 8 0 5 VCC2 Voltage always on 4 8 0 5 VCC3 Voltage always on 7 85 0 5 VCC4 Voltage always on 5 0 0 5 VCC5 Voltage always on 5 0 0 5 TWAD1 Amplifier bias to A13 RF Front End Assembly 6 0 0 5 TWAD2 Amplifier bias to A13 RF Front End Assembly 6...

Страница 162: ... Input Attenuator A Power Level Verification Press Mode Preset Input Output RF Calibrator 50 MHz AMPTD Attenuation Mech Atten 0 dB on the analyzer Refer to Figure 4 13 remove cable W11 from A9 1 Output Measure the 50 MHz calibrator signal on the output of the attenuator using a functioning Spectrum Analyzer Figure 4 13 Cable W11 ...

Страница 163: ...easured on the functioning Spectrum Analyzer should measure 2 dB lower than the previous step 27 dBm Press Mech Atten and enter 4 dB The 50 MHz calibrator signal measured on the functioning Spectrum Analyzer should measure an additional 2 dB lower than the previous step 29 dBm If the power levels measure correctly reconnect W11 cable If either of these levels is incorrect Input Attenuator A is the...

Страница 164: ...B Power Level Verification Press AMPTD Attenuation Mech Atten 0 dB Remove output cable W9 from A10 2 Refer to Figure 4 13 Measure the 50 MHz calibrator signal on the output of the attenuator using a functioning Spectrum Analyzer The level should be 25 dBm 2 dB as shown in Figure 4 15 Figure 4 15 50 MHz Calibrator Signal on Output of Attenuator B ...

Страница 165: ...g Since the analyzer is equipped with standard Option FSA press Mech Atten and enter 6 dB The 50 MHz calibrator signal measured on the functioning Spectrum Analyzer should measure 6 dB lower than the previous step 31 dBm as shown in Figure 4 16 Figure 4 16 50 MHz Calibrator Signal on Output of Attenuator B with 6 dB Attenuation ...

Страница 166: ...d enter 10 dB The 50 MHz calibrator signal measured on the functioning Spectrum Analyzer should measure 10 dB lower than the first step 35 dBm Continue testing all the attenuation settings as described in Table 4 10 Table 4 10 Attenuator Setting dB Expected Level dBm 50 MHz Tolerance 16 41 3 dB 20 45 3 dB 30 55 3 dB 40 65 4 dB 50 75 4 dB 60 85 4 dB ...

Страница 167: ... most probable cause provided the switch control logic has been verified Low Band Switch Power Level Verification Refer to Figure 4 17 Disconnect the W3 cable at A11J2 of the A11 Low Band Switch 1 Figure 4 17 Cable W3 Location 1 It may be difficult to measure the higher attenuator settings using the 25 dBm internal calibrator signal Use an external source with the frequency set to 50 MHz and adjus...

Страница 168: ...5 dBm 5 dB as shown in Figure 4 18 Figure 4 18 50 MHz Calibrator Signal at Output of W3 Cable If the power level is incorrect the most probable cause is the low band switch assembly Reconnect W3 cable The following Low Band path items have been verified in the RF section 50 MHz Calibrator signal power level from the A16 Reference Assembly 1st L O power level from the A14 L O Synthesizer Switch con...

Страница 169: ...d Functioning Spectrum Analyzer Functioning Signal Generator to 15 GHz DVM Cables Connectors Turn the analyzer on and allow it to complete its full boot up process to Signal Analyzer mode Use the internal 4 8 GHz 28 dBm calibrator signal as a reference for troubleshooting by pressing Mode Preset Input Output RF Calibrator 4 8 GHz on the analyzer Now press FREQ 4 8 GHz Zero Span AMPTD Attenuation M...

Страница 170: ...e Figure Analyzers Service Guide RF Section Troubleshooting N8973B 74B 75B Analyzers Troubleshooting Disconnect cable W15 or W36 at A13J7 322 5 MHz output on the Front End Assembly 1 See Figure 4 19 Figure 4 19 W15 or W36 Location ...

Страница 171: ...re 4 20 Figure 4 20 322 5 MHz Intermediate Frequency If this power level is correct the entire RF section is operating correctly in high band If this power level is incorrect verify the following assemblies in the order listed using the 4 8 GHz internal calibrator signal 1 A16 Reference Assembly 2 A14 L O Synthesizer 3 A15 Front End Control Assembly 4 A9 Input Attenuator A 5 A10 Input Attenuator B...

Страница 172: ... high band mixer internal to the A13 RF Front End Assembly for RF input frequencies from 13 GHz to 26 5 GHz Since all the control voltages and biasing were already fully tested failures from 13 GHz 26 5 GHz will most likely be caused by the A13 RF Front End Assembly If the failure is amplitude related proper adjustments such as frequency response and the YTF Preselector adjust should be performed ...

Страница 173: ...973B 74B 75B Analyzers Troubleshooting Troubleshooting a High Band Problem 1 Reference Assembly Verification Refer to Figure 4 22 Remove cable W19 from A9 Input Attenuator A 1 Measure the 4 8 GHz calibrator signal on the cable end with a functioning Spectrum Analyzer Figure 4 22 W19 Location ...

Страница 174: ...lyzers Troubleshooting If the Reference Assembly calibrator is functioning properly the 4 8 GHz calibrator signal will measure 4 8 GHz at 28 dBm 3 dB as shown in Figure 4 23 If this level is incorrect the Reference Assembly is most likely defective Reconnect W19 at A9 1 Figure 4 23 4 8 GHz Calibrator Signal ...

Страница 175: ... 74B 75B Analyzers Troubleshooting 2 L O Synthesizer Assembly Verification Press the following keys on the analyzer MODE MEAS Spectrum Analyzer OK Mode Preset FREQ 5 GHz Zero Span Refer to Figure 4 24 Disconnect cable W4 at A14J740 of the L O Synthesizer Assembly 1 Figure 4 24 W4 and W6 Location ...

Страница 176: ...yzer and appropriate high frequency cable and connector to A14J740 Adjust the analyzer to measure a signal at 5322 5 MHz at 16 dBm 4 dB as shown in Figure 4 25 Figure 4 25 Measure 1st L O If this power level is incorrect remove W6 at A14J200 Refer to Figure 4 24 Connect the functioning spectrum analyzer to the cable output using the appropriate high frequency cable ...

Страница 177: ... a signal at 4 8 GHz at 4 5 dBm 2 dB as shown in Figure 4 26 Figure 4 26 4 8 GHz Signal If this power level is incorrect the most probable cause is the A16 Reference Assembly If this level is correct and yet the signal previously measured at A14J740 is incorrect the most probable cause is the A14 L O Synthesizer Assembly Reconnect W4 cable to A14J740 Reconnect W6 cable to A14J200 ...

Страница 178: ... E4410 60115 or kit number N9020 60005 The kit includes the troubleshooting board and associated interconnect cables The troubleshooting board and cables will help verify the control logic from this assembly to Input Attenuator A Input Attenuator B Low Band Switch YTF Preselector Low Band Preamplifier High Band Preamplifier and the RF Front End Assembly The control logic should be verified going t...

Страница 179: ...FA Series Noise Figure Analyzers Service Guide 179 RF Section Troubleshooting N8973B 74B 75B Analyzers Troubleshooting Figure 4 27 RF Front End Troubleshooting Board Figure 4 28 RF Front End Troubleshooting Board ...

Страница 180: ... 25V supply is up for Attenuator A DS10 under J4 should be on if the 25V supply is up for Attenuator B If any of the power supply LED s are not turned on see Chapter 2 Boot Up and Initialization Troubleshooting Press AMPTD Attenuation Mech Atten 0 dB 4 Input Attenuator A Control Logic Verification All the attenuation LED s on the Front End Troubleshooting board should be off except for DS9 and DS1...

Страница 181: ...Keysight NFA Series Noise Figure Analyzers Service Guide 181 RF Section Troubleshooting N8973B 74B 75B Analyzers Troubleshooting Figure 4 29 Front End Troubleshooting Board Attenuation LEDs ...

Страница 182: ...zer default setting for RF Coupling is AC mode Verify the AC Select LED DS14 is illuminated at this time Set Input Output RF Coupling to DC DS14 turns off DS11 DC Select yellow LED should illuminate Switch the RF Coupling back to AC If the LED s illuminate correctly the switch control logic to Input Attenuator A from the A15 Front End Control Assembly is correct If the LED s are not illuminating a...

Страница 183: ...nt End Troubleshooting board according to Table 4 12 Set the input attenuator back to 10 dB by pressing AMPTD Attenuation Mech Atten 10 dB on the analyzer If the LED s illuminate correctly the switch control logic for the input attenuators from the A15 Front End Control Assembly is correct If the LED s are not illuminating as expected the most probable cause is the A15 Front End Control Assembly T...

Страница 184: ...ead to one of the In1A test points and the negative lead to the bottom of R46 blue resistor near the bottom on the Front End Troubleshooting board Verify the voltages in Table 4 13 Press Freq 5 GHz on the analyzer Verify the voltages in Table 4 14 If the voltages are not correct the most probable cause is the A15 Front End Control Assembly Table 4 13 Test Point Voltage In1A 9 85 In2A 9 85 In1B 9 7...

Страница 185: ...e A15 Front End Control Assembly Perform the YTF characterization press System Alignments Advanced Characterize Preselector To further test the YTF control current select Amps on the DVM and place the positive lead of the DVM on one of the YTF Coil Current P8 pins and the other DVM lead to the other Coil Current pin In order to properly measure the preselector tune output from the A15 Front End Co...

Страница 186: ...rization press System Alignments Advanced Characterize Preselector and re check the control current at various center frequencies In order to measure the control current correctly press Restart on the analyzer in between each measurement Table 4 16 YTF Tune Current Center Frequency GHz Control Current mA Tolerance mA 5 0 106 20 10a a N8975B 76B 215 25 15a 324 30 20a 430 40 26a 560 50 Tolerances sh...

Страница 187: ...S5B Sets E atten to 2 dB preamps off E atten 2 dB 9 83 0 5 S6A Sets E atten to 1 dB preamps off E atten 1 dB 9 67 0 5 S6B Sets E atten to 1 dB preamps off E atten 1 dB 9 83 0 5 S7A Sets E atten to 2 dB preamps off E atten 2 dB 9 67 0 5 S7B Sets E atten to 2 dB preamps off E atten 2 dB 9 83 0 5 S8A Sets E atten to 20 dB preamps off E atten 20 dB 9 67 0 5 S8B Sets E atten to 20 dB preamps off E atte...

Страница 188: ...C3 Voltage always on 7 85 0 5 VCC4 Voltage always on 5 0 0 5 VCC5 Voltage always on 5 0 0 5 TWAD1 Amplifier bias to A13 RF Front End Assembly 6 0 0 5 TWAD2 Amplifier bias to A13 RF Front End Assembly 6 0 0 5 TWAD3 Amplifier bias to A13 RF Front End Assembly 6 0 0 5 TWAD4 Amplifier bias to A13 RF Front End Assembly 6 0 0 5 TWAD5 Amplifier bias to A13 RF Front End Assembly 6 0 0 5 Table 4 17 Front E...

Страница 189: ...lyzer cables to the A15 Front End Control Assembly Turn the instrument on and allow it to complete its full boot up process to Spectrum Analyzer mode Input Attenuator A Power Level Verification Press MODE MEAS Spectrum Analyzer OK Mode Preset Input Output RF Calibrator 4 8 GHz AMPTD Attenuation Mech Atten 0 dB on the analyzer Refer to Figure 4 30 remove cable W11 from A9 1 Output Measure the 4 8 G...

Страница 190: ...nter 4 dB The 4 8 GHz calibrator signal measured on the functioning Spectrum Analyzer should measure an additional 2 dB lower than the previous step 32 dBm If the power levels measure correctly reconnect W11 cable If either of these levels is incorrect Input Attenuator A is the most probable cause provided the control logic from the A15 Front End Control Assembly was previously verified Input Atte...

Страница 191: ...Hz calibrator signal measured on the functioning Spectrum Analyzer should measure 6 dB lower than the previous step 34 dBm Press Mech Atten and enter 10 dB The 4 8 GHz calibrator signal measured on the functioning Spectrum Analyzer should measure 10 dB lower than the first step 38 dBm Continue testing all the attenuation settings as described in Table 4 18 Table 4 18 Attenuator Setting Expected Le...

Страница 192: ...yzer If either of these levels measure incorrectly Input Attenuator B is the most probable cause provided the switch control logic has been verified 1 It may be difficult to measure the higher attenuator settings using the 28 dBm internal calibrator signal Use an external source with the frequency set to 4 8 GHz and adjust the output level to 0 dBm This will increase the measured power levels note...

Страница 193: ...igure 4 33 Carefully disconnect both ends of the W8 cable at A11J3 and A12 1 input Figure 4 33 W8 Location Press MODE MEAS Spectrum Analyzer OK Input Output RF Calibrator 4 8 GHz AMPTD Attenuation Mech Atten 10 dB FREQ 4 8 GHz Zero Span on the analyzer Be careful not to short out components on the front panel interface board or the components on top of the A12 YTF Preselector when removing W8 ...

Страница 194: ...ignments Auto Align Auto Align Off Measure the 4 8 GHz calibrator signal on the output of A11J3 Low Band Switch high band output port using a functioning Spectrum Analyzer The level should be 46 dBm 3 dB as shown in Figure 4 34 There is 8 dB of loss through the A11 Low Band Switch when using the 4 8 GHz reference signal Figure 4 34 4 8 GHz Calibrator Signal at Output of W8 Cable ...

Страница 195: ...do not reconnect W8 at this time Refer to Figure 4 35 disconnect W7 at A12 1 output and install a connector such that the A12 YTF Preselector output can be measured Figure 4 35 Cable W7 at A12 Output Once the connector is installed carefully reconnect W8 to make the measurement If the power level is incorrect the most probable cause is the A12 YTF Preselector ...

Страница 196: ...y be required To perform the YTF alignment reconnect W7 and press System Alignments Advanced Characterize Preselector The routine may take several minutes to align the YTF Display the 4 8 GHz calibrator on screen as explained in the quick check section If the signal level is still incorrect suspect all assemblies cables and switches between the W7 cable and the output of the A11 Low Band Switch Re...

Страница 197: ... the most probable cause would be the A13 Front End Assembly High Band 2 RF signal path utilizes a high band mixer internal to the A13 RF Front End Assembly for RF input frequencies from 13 6 GHz to 26 5 GHz Since all the control voltages and biasing were already fully tested failures from 13 6 GHz 26 5 GHz will most likely be caused by the A13 RF Front End Assembly If the failure is amplitude rel...

Страница 198: ...imum performance is possible The amplitude error could be caused by poor frequency response and performing the high band frequency response adjustment using the calibration software will adjust the preamp on high band path Assure you have evaluated all causes including A15 Front End Controller switching problems before you replace the Front End assembly High Band Mixing Equations For input signal ...

Страница 199: ...gnal path The following sections are found in this chapter RF Section Description on page 200 Quick Check to Verify the Low Band Signal Path on page 206 Troubleshooting a Low Band Problem on page 209 Quick Check to Verify High Band RF Path on page 216 Troubleshooting a High Band Problem on page 221 Each section describes how the assembly works and gives information to help you troubleshoot the ass...

Страница 200: ... the input frequency is 3 6 GHz to 17 1 GHz 3 High band RF path 2 is used when the input frequency is 17 GHz to 34 5 GHz 4 High band RF Path 3 is used when the input frequency is 34 4 GHz to 44 GHz The RF section is designed to convert RF input signals to an intermediate frequency that is present at the RF output of the A13 Front End assembly This intermediate frequency IF depends on installed opt...

Страница 201: ...the low band input of the A13 RF Front End assembly There are 3 different signal paths on the input of the RF Front End assembly that the signal can be routed through depending on installed options and front panel settings Low Band Preamplifier path 20 dB nominal gain Any standard preamp option Direct to Mixer 1 The RF input signal is then mixed with the 1st LO from the A20 YTO assembly to a 1st i...

Страница 202: ... Front End Assembly routes the RF input signal to Mixer 2 where it mixes with the LO and provides a 1st intermediate frequency of 322 5 MHz The 322 5 MHz IF output is at A13J7 The control voltages and biasing are provided by the A15 Front End Control Assembly The LO is doubled for tuned frequencies 8 4 GHz in this path 3 RF input frequencies from 17 1 GHz to 34 5 GHz go through the high band path ...

Страница 203: ... from 3 6 GHz to 44 GHz Millimeter Wave RF Output to A12 YTF Preselector Contains standard optional high band preamplifier which has a typical gain of 35 dB to 40 dB and a noise figure from 9 to 23 dB up to 44 GHz A12 YTF Preselector The YTF Preselector is used for input frequencies greater than 3 6 GHz Signals less than 3 6 GHz bypass the YTF assembly and are routed to the low band input of the A...

Страница 204: ...ection Description A13 RF Front End Assembly N8976B This assembly contains the major front end conversion components The A13 is repaired at the assembly level Replacement A13 assemblies include the A13A1 1st IF Bandpass Filter See Figure 5 1 Figure 5 1 A13 RF Front End Assembly View from Front Panel ...

Страница 205: ...2 RF input signals 3 6 GHz to 17 1 GHz Microwave Input Amplifier Mixer 3 RF input signals 17 GHz to 34 5 GHz Mixer 4 RF input signals 34 4 GHz to 44 GHz LO Doubler External Mixing Diplexer A15 Front End Control Assembly Provides the correct biasing and switch control logic to the following RF assemblies Input Attenuator A Input Attenuator B Low Band Switch YTF Preselector Input signals 3 6 GHz Fro...

Страница 206: ...MA f cable SMA f to SMA f adapter SMA m to SMA m adapter 3 5mm f to 2 4mm m adapters 2 required Turn the instrument on and allow it to complete its full boot up process to Noise Figure mode Use the internal 50 MHz 25 dBm calibrator signal as a reference for troubleshooting by pressing MODE MEAS Spectrum Analyzer OK Mode Preset Input Output RF Calibrator 50 MHz on the analyzer Now press FREQ 50 MHz...

Страница 207: ... output to a functioning spectrum analyzer and verify the 322 5 MHz intermediate frequency is measuring 22 dBm 3 dB using the same analyzer settings as in Figure 5 2 Figure 5 2 322 5 MHz Intermediate Frequency If this power level is correct the signal path from the A9 50 MHz Reference signal input port to A13J7 IF Output is operating correctly using a 50 MHz input calibrator signal Reconnect the W...

Страница 208: ... Input Output RF Calibrator 50 MHz when verifying the performance 1 A11 Low Band Switch 2 A10 Input Attenuator B 3 A9 Input Attenuator A 4 A16 Reference Assembly 50 MHz calibrator 2nd LO 5 A13 RF Front End Assembly In order to gain access to the front end components remove the front frame assembly but leave the ribbon cable connected so you can still control the instrument Remove the right side ch...

Страница 209: ...requency is set below 3 6 GHz the analyzer will sweep up to 3 6 GHz in low band and then automatically switch to the high band path above 3 6 GHz A11 Low Band Switch Verification Disconnect W3 from A13J2 See Figure 5 3 for location of connector Attach a right angle SMA adapter to W3 and measure the output of the Low Band Switch with a spectrum analyzer Expected signal is 50 MHz at 35 3 dBm since t...

Страница 210: ...er under test Press Input Output RF Calibrator Off If the signal level at the attenuator output is now correct suspect the A9 Attenuator cal switch or a faulty control signal from the A15 Front End Controller assembly Attenuator Check Set the signal source connected to the analyzer input port to 0 dBm On the analyzer press Amplitude Attenuation and change input attenuation to 0 dB The measuring sp...

Страница 211: ...n the Front End Assembly at A13J1 or the A16 Reference Assembly at A16J702 Expected signal is 4800 MHz at 10 dBm when a low loss test cable is used and with the measuring spectrum analyzer input attenuator set to at least 20 dB to prevent overload L O Synthesizer Assembly Verification Press the following keys on the analyzer FREQ 1 GHz Span Zero Span Refer to Figure 5 4 Disconnect cable W4 at A14J...

Страница 212: ...bleshooting N8976B Troubleshooting Connect the functioning Spectrum Analyzer and appropriate high frequency cable and connector to A14J740 Adjust the functioning Spectrum Analyzer to measure a signal at 6122 5 MHz at 16 dBm 4 dB as seen in Figure 5 5 Figure 5 5 Measure 1st L O ...

Страница 213: ...A14J740 is incorrect the most probable cause is the A14 L O Synthesizer Assembly Reconnect W4 cable to A14J740 Reconnect W6 cable to A14J200 A13 Front End Assembly Verification Many portions of the Front End Assembly have been verified earlier in the Low Band troubleshooting process outlined above The input signal level was measured on W3 as part of the A11 Low Band Switch verification The output ...

Страница 214: ...utputs were tested when performing the First LO Verification It is possible to measure the A13W1 input cable to A13A1 where it connects to A13A1J2 and the output of the A13A1 at A13W2 where it connects to A13J11 A13A1 IF Band Pass Filter is not separately replaceable but being able to determine where the signal level is faulty can aid in verifying the faulty assembly See the block diagram for sign...

Страница 215: ...ivate the preamp The expected operation is the signal level will not change more than 0 5 dB and the noise floor will increase due to the fact the input attenuator is automatically increased If the amplitude error when switching the preamp on and off is greater than 0 5 dB assure that any other internal alignment failures are resolved since the System Gain alignment must run before optimum perform...

Страница 216: ...the Stop frequency is set above 3 6 GHz the analyzer will start sweeping in Low Band up to 3 6 GHz and then automatically switch to the high band path above 3 6 GHz Equipment needed Spectrum Analyzer with frequency range to 14 GHz Signal source with output power 0 dBm and frequency range to at least the maximum frequency of the EXA Power splitter 11667C 2 each quality 2 4 mm cables 90 SMA m to SMA...

Страница 217: ...Q Center Frequency 4 8 GHz Span 1 MHz Peak Search The 4 8 GHz reference signal should measure 28 dBm 2 dB on the analyzer display If the power level is within tolerance the 3 6 GHz to 17 1 GHz path is functioning correctly at 4 8 GHz If the power level is incorrect select the 50 MHz RF calibrator and set the analyzer center frequency to 50 MHz Since several of the same signal path components are s...

Страница 218: ...Noise Figure Analyzers Service Guide RF Section Troubleshooting N8976B Troubleshooting Disconnect cable W36 at A13J7 322 5 MHz output on the Front End Assembly See Figure 5 7 Select Span 0 Hz Figure 5 7 A13A1J7 Location N8976B ...

Страница 219: ...4 dB as shown in Figure 5 8 Figure 5 8 322 5 MHz Intermediate Frequency If this power level is correct the Front End assembly is operating correctly in high band If this power level is incorrect verify the following assemblies using the 4 8 GHz internal calibrator signal 1 A11 Low Band Switch 2 A10 Input Attenuator B 3 A9 Input Attenuator A 4 A16 Reference Assembly 4 8 GHz calibrator 5 A12 YTF Pre...

Страница 220: ... band mixer internal to the A13 Front End Assembly for input frequencies from 17 0 GHz to 34 5 GHz High Band 3 signal path utilizes a high band mixer internal to the A13 Front End Assembly for input frequencies from 34 4 to 44 GHz Failures from 3 6 GHz to 44 GHz will most likely be caused by the A13 RF Front End Assembly If the failure is amplitude related proper adjustments such as frequency resp...

Страница 221: ...10 for location of connector Loosen the other end of W7 if possible to avoid damaging the cable Attach a right angle SMA adapter to W7 and measure the input to the A13 Front End with a spectrum analyzer Figure 5 10 A13J9 Location Expected signal is 4 8 GHz at 51 dBm 4 dB The tolerance is large because the A12 YTF microwave preselector loss varies between devices and the YTF may not be perfectly al...

Страница 222: ...om the A15 Front End controller The control signals are explained in the Front End Control Troubleshooting section Figure 5 11 RF Section A9 Input Attenuator A and A10 Input Attenuator B Verification Calibrator Switch Test On the A16 Reference assembly disconnect semi rigid cable W19 from A16J701 and measure A16J701 with a spectrum analyzer Expected signal is 4 8 GHz at 28 dBm 0 5 dB If signal lev...

Страница 223: ... dB The measuring spectrum analyzer connected to A10 Attenuator output port should indicate a 0 dBm level Change the input attenuation on the analyzer under test to 2 dB See the chart below for expected measurement values at the A10 Attenuator output port Analyzer Under Test Attenuator Setting dB Power at A10 Output Port dBm Input Attenuator Being Tested 0 0 dBm reference Both set to through path ...

Страница 224: ...hooting N8976B Troubleshooting L O Synthesizer Assembly Verification Press the following keys on the analyzer Mode Preset FREQ 5 GHz Center Frequency Span Zero Span Refer to Figure 5 12 Disconnect cable W4 at A14J740 of the L O Synthesizer Assembly 1 Figure 5 12 W4 and W6 Location ...

Страница 225: ...appropriate high frequency cable and connector to A14J740 Adjust the analyzer to measure a signal at 5322 5 MHz at 16 dBm 4 dB as shown in Figure 5 13 Figure 5 13 Measure 1st L O If this power level is incorrect remove W6 at A14J200 Refer to Figure 5 12 Connect the functioning spectrum analyzer to the cable output using the appropriate high frequency cable ...

Страница 226: ... is the A14 L O Synthesizer Assembly Reconnect W4 cable to A14J740 Reconnect W6 cable to A14J200 A13 Front End Assembly Verification Many portions of the Front End Assembly have been verified earlier in the High Band troubleshooting process outlined above The input signal level was measured on W46 or W7 as part of the A13 Front End Input Verification The output signal level was measured at A13J7 d...

Страница 227: ...ignment failures are resolved since the System Gain alignment must run before optimum performance is possible The amplitude error could be caused by poor frequency response and performing the high band frequency response adjustment using the calibration software will adjust the preamp on high band path Assure you have evaluated all causes including A15 Front End Controller switching problems befor...

Страница 228: ...228 Keysight NFA Series Noise Figure Analyzers Service Guide RF Section Troubleshooting N8976B Troubleshooting ...

Страница 229: ...ers Service Guide 6 Front End Control Troubleshooting What You Will Find in This Chapter The following information is found in this chapter A15 Front End Control Description on page 230 A15 Front End Control Assembly Troubleshooting on page 235 ...

Страница 230: ... 3 Provides control logic for various instrument options within the analyzer These signals are routed to and from the A15 via ribbon cables wiring harnesses and coaxial cables The RF front end assemblies require the correct control logic and bias in order to function properly If the voltages from the A15 are not correct the RF input signals will most likely be displayed at an incorrect power level...

Страница 231: ...for the N8976B A10 Input Attenuator B 66 dB total for the N8973B 74B and 75B 60 dB total for the N8976B A11 Low Band Switch A12 YIG Tuned Filter A13 RF Front End Assembly A15 On Board Circuits RF Burst Trigger When set to Relative Trigger or when center frequency is 300 MHz YTF Tune Ramp Preselector Tune Out Provides output voltage not specified reserved for future use Mixer Bias Amplifier Bias Sw...

Страница 232: ...232 Keysight NFA Series Noise Figure Analyzers Service Guide Front End Control Troubleshooting A15 Front End Control Description Figure 6 1 A15 Front View Physical Connectors EFEC ...

Страница 233: ...Keysight NFA Series Noise Figure Analyzers Service Guide 233 Front End Control Troubleshooting A15 Front End Control Description Figure 6 2 A15 Front View Physical Connectors EFEC Lite ...

Страница 234: ... A J900 Narrowband I F Out To A2 N A J901 Wideband I F Out To A3 N A J902 322 5 MHz I F In From A13 N A J1100 Aux I F Out To Rear Panel N A J1300 Switched I F Filter Out Reserved for future use J700 J700 Low Band Switch Logic Out To A11 J800 J800 Mechanical Attenuator Logic Out To A9 A10 J301 J301 Sweep Out Reserved for future use J102 J102 R F Front End Logic Out To A13 J302 J302 Preselector Tune...

Страница 235: ... of front end assemblies The troubleshooting board kit part number is N9020 60005 and includes the troubleshooting board and required interconnect cables If you have the interconnect cables you can order the board by itself using part number E4410 60115 When using the troubleshooting board and cables the control logic for Input Attenuator A Input Attenuator B Low Band Switch and some of the power ...

Страница 236: ...hooting A15 Front End Control Assembly Troubleshooting Verifying Input Attenuator A Input Attenuator B Low Band Switch Logic and Power Supplies 1 Turn off the instrument 2 Disconnect ribbon cables from A15J700 and A15J800 as shown Figure 6 3 Figure 6 3 Ribbon Cables at A15J700 and A15J800 ...

Страница 237: ...r connector is marked with a red stripe Connect the end with the 20 pin connector to A15J800 Connect the two 10 pin connectors to either J3 or J4 of the RF Front End Troubleshooting board based upon the EXA s frequency range as described below 4 If the NFA is an N8973B 74B or 75B also connect the Low Band Switch Control Cable E4410 60160 between A15J700 and J2 of the RF Front End Troubleshooting b...

Страница 238: ...Figure 6 5 Figure 6 5 RF Front End Troubleshooting Board Placement 6 Turn the instrument on and allow it to complete its full boot up process to the Noise Figure application 7 Turn Auto Align off by pressing System Alignments Auto Align Auto Align Off on the analyzer You may notice an Align Now All required message on the analyzer display This can occur when the test board is connected Resistors o...

Страница 239: ...rd should be off When the input attenuation is changed from 0 dB to 2 dB the 2 dB Step LED DS15 should illuminate When the input attenuation is changed from 2 dB to 4 dB DS15 and DS16 should be illuminated as per Table 6 4 If this is incorrect the most probable cause is the A15 Front End Control assembly The analyzer default setting for RF Coupling is AC mode Verify the AC Select LED DS14 is illum...

Страница 240: ...z attenuators not the 50 GHz attenuators that are actually installed If this occurs skip this procedure and troubleshoot the Low Band Switch Press MODE MEAS Spectrum Analyzer OK AMPTD Attenuation Mech Atten 0 dB on the analyzer Attenuation LEDs DS14 through DS20 should be off When the input attenuation is changed from 0 to 8 dB in 2 dB steps LEDs DS14 through DS16 should be illuminated as per Tabl...

Страница 241: ...bleshooting board according to Table 6 6 If the LED s illuminate correctly the switch control logic for the input attenuators from the A15 Front End Control Assembly is correct If the LED s are not illuminating as expected the most probable cause is the A15 Front End Control Assembly Set the input attenuator back to 10 dB by pressing AMPTD Attenuation Mech Atten 10 dB on the analyzer Table 6 6 Inp...

Страница 242: ...S18 is illuminated If the LEDs illuminate correctly the switch control logic for the input attenuators from the A15 Front End Control assembly is correct If the LEDs are not illuminating as expected the most probable cause is the A15 Front End Control Assembly Set the input attenuator back to 10 dB by pressing AMPTD Attenuation Mech Atten 10 dB on the analyzer Table 6 7 Input Attenuator B LED s N8...

Страница 243: ...d to test point listed in the table below and the negative lead to the instrument chassis These test points are located under the J2 connector Verify the voltages in Table 6 8 Press FREQ 5 GHz on the analyzer Verify the voltages in Table 6 9 If the voltages are not correct the most probable cause is the A15 Front End Control board If the analyzer is an N8976B skip to Disconnect RF Front End Troubl...

Страница 244: ...ed the RF front end troubleshooting board to test out the remaining front end hardware components At this point it is advisable to shutdown the analyzer and disconnect the test board and cables Be sure to reconnect the Low Band switch ribbon cable and the input attenuator ribbon that were originally plugged into the Front End Control board before testing the input attenuator and low band switch lo...

Страница 245: ...g to BNC f adapter part number E9637A for the Voltmeter The preselector tune output voltage can be measured to verify this portion of the A15 is functioning Press System Alignments Auto Align Auto Align Off on the analyzer once it has fully booted to the Noise Figure application Press Freq Span Zero Span on the analyzer The preselector tune output voltage in high band should change when the center...

Страница 246: ...rect it does not guarantee the proper control current is getting to the YTF There is not a convenient way to measure the control current so if a high band issue is suspect it is recommended that the A15 is changed out first before changing the YTF since the A15 board has easy access 42 5 7 75 43 5 8 0 Table 6 11 Preselector Tune Output Voltages N8976B Center Frequency GHz Tune Voltage VDC ...

Страница 247: ...a hardware problem by verifying the functionality of assemblies in the IF section signal path The NFA Series Noise Figure analyzers come standard with 25 MHz analyzer BW The following sections provide for each assembly a description of how the assembly works and then gives information to help you troubleshoot the assembly Each description explains the purpose of the assembly describes the main com...

Страница 248: ...sections are found in this chapter 25 MHz BW IF Section A2 Analog I F Assembly Description on page 249 A2 Analog I F Assembly Theory of Operation on page 250 A2 Analog I F Troubleshooting on page 253 A3 Digital I F Assembly Description on page 260 A3 Digital I F Assembly Theory of Operation on page 261 A3 Digital I F Troubleshooting on page 263 ...

Страница 249: ... The final 22 5 MHz signal goes through a series of variable band pass filters each having a specific bandwidth Three things determine the signal path and which filters are chosen Instrument resolution bandwidth RBW setting Application used Mode applied This assembly contains the burst carrier trigger circuitry for performing mobile communication measurements The output of the assembly is a filter...

Страница 250: ...e and wide band demod The 12 MHz ceramic bandpass filter is used for normal Signal Analyzer swept and FFT operation The 300 kHz Surface Acoustic Wave SAW is used for ACP modes Mixer There are two mixers that reside on this assembly The first mixer is used to down convert the 322 5 MHz input to the final 22 5 MHz I F The other mixer is described in the I F Comb Cal section 3rd LO The 300 MHz 3rd L ...

Страница 251: ... MHz I F when using Signal Analyzer swept mode 1 LC wide 2 LC narrow 3 Crystal wide 4 Crystal narrow 5 Through path The LC wide signal path is used when the analyzer Res BW setting is 180 kHz to 390 kHz The LC narrow signal path is used when the analyzer Res BW setting is 30 kHz to 160 kHz The Crystal wide signal path is used when the analyzer Res BW setting is 4 3 kHz to 27 kHz The Crystal narrow...

Страница 252: ... demod The through path is selected when the image filter is in the 25 MHz mode for IQ Analyzer swept and wide band demod In all other cases the signal will pass through the second 12 MHz anti alias filter The step gain block provides an additional switchable 10 dB gain to overcome the ADC noise floor and provide an additional 2 dB of analyzer sensitivity Burst Carrier Trigger The Burst Carrier Tr...

Страница 253: ...Replacement Procedures in this service guide 3 Turn on the NFA and wait for the instrument to complete the boot up process 4 Press System Alignments Auto Align Off 5 Press Input Output RF calibrator 50 MHz 6 Verify the 50 MHz signal is at 25 dBm on the analyzer display by pressing MODE MEAS Spectrum Analyzer OK FREQ 50 MHz Span 1 MHz Peak Search on the NFA The marker readout should be 50 MHz at 25...

Страница 254: ...ble at A13J7 as shown in Figure 7 1 Figure 7 1 A13 RF Front End Assembly RF Microwave Instruments 9 Connect A13J7 to a functioning spectrum analyzer using the appropriate SMA connectors and cables 10 Press Freq 322 5 MHz Span 1 MHz Peak Search on the functioning spectrum analyzer 11 The analyzer should read 322 5 MHz at 30 dBm 3 dBm as shown in Figure 7 2 ...

Страница 255: ... at this location is for convenience The 322 5 MHz signal is an output at A13J7 Since the W15 cable connects from this output to the input of the Analog I F assembly at A2J100 the small coaxial cable has not been tested at this point If the 322 5 MHz signal is not measuring the correct power level refer to Chapter 4 RF Section Troubleshooting N8973B 74B 75B Analyzers in this service guide ...

Страница 256: ...ing MODE MEAS Spectrum Analyzer OK FREQ 50 MHz Span 1 MHz Peak Search on the analyzer The marker readout should be 50 MHz at 25 dBm 3 dBm If this reference signal is measuring incorrectly see Chapter 4 RF Section Troubleshooting N8973B 74B 75B Analyzers in this service guide 7 To continue verifying press FREQ Zero Span Verify the input attenuator on the NFA is set to 10 dB Look near the top of the...

Страница 257: ...on the functioning spectrum analyzer 11 The analyzer marker should read 22 5 MHz at 25 dBm 4 dBm as shown in Figure 7 4 Figure 7 4 A2 Analog I F Output If the 22 5 MHz signal is not measuring the correct power level do not assume the Analog I F is the most probable cause until the 3rd L O frequency and power level have been verified below If the 22 5 MHz signal is within tolerance carefully reconn...

Страница 258: ...nce Assembly 1 Refer to Figure 7 5 carefully disconnect the W14 at A2J300 Figure 7 5 A2 Analog I F Cables 2 Connect the W14 cable to the MMCX female to SMA female connector Use an appropriate cable to go from the SMA connector to the RF input of a functioning spectrum analyzer 3 Press Freq 300 MHz Span 1 MHz Amplitude 10 dBm Peak Search on the functioning spectrum analyzer ...

Страница 259: ...z at 10 dBm 3 dBm as shown in Figure 7 6 Figure 7 6 300 MHz L O If the 300 MHz signal is not measuring the correct power level see the A16 Reference Assembly troubleshooting section in this service guide If the 300 MHz L O is measuring the correct power level and frequency and the 22 5 MHz signal is low the most probable cause is the A2 Analog I F assembly ...

Страница 260: ... the time domain continuous data into I Q in phase and quadrature signals before sending the data to the A4 CPU assembly for further processing and front panel display The Digital I F has the following main functions Digitizes the final 22 5 MHz Intermediate Frequency 14 bit ADC with a 90 MHz sample rate DSP for standard spectrum analysis Capture memory for complex signals Noise Source Control Dit...

Страница 261: ...signal analyzer The trigger outputs are used to synchronize other pieces of test equipment to the analyzer These outputs are configurable through the Input Output menu via the front panel of the instrument The trigger inputs each allow trigger levels to be set from 5 to 5 volts using the control DAC The circuits have relatively high input impedance The trigger outputs have 50 Ω source impedance wi...

Страница 262: ... for the 28 volt and 15 volt power supply In addition it has buffers to interface to the SNS I2C bus for control and read back of ENR data automatically The SNS connector is used with the SNS series noise sources DSP The signal from the ADC is sent to the Digital Signal Processor Digital Bus Common Mode Filtering The Digital Bus is a real time digital interface It is sometimes referred to as Messe...

Страница 263: ... Press System Alignments Auto Align Off 6 Press Input RF Calibrator 50 MHz 7 Verify the 50 MHz signal is at 25 dBm by pressing MODE MEAS Spectrum Analyzer OK FREQ 50 MHz Span 1 MHz Peak Search on the analyzer The marker readout should be 50 MHz at 25 dBm 3 dBm If this reference signal is measuring incorrectly see Chapter 4 RF Section Troubleshooting N8973B 74B 75B Analyzers on page 133 in this ser...

Страница 264: ...gure 7 7 carefully disconnect W13 at A3J15 Figure 7 7 A3 Digital I F Cables 10 Connect the W13 cable to the MMCX female to SMA female connector Use an appropriate cable to go from the SMA connector to the RF input of a functioning spectrum analyzer 11 Press Freq 22 5 MHz Span 1 MHz Peak Search on the functioning spectrum analyzer ...

Страница 265: ...nalyzer Refer to Chapter 15 Assembly Replacement Procedures on page 389 in this service guide 3 Turn the instrument over so that the bottom is facing up 4 Turn on the analyzer and wait for the instrument to complete the boot up process 5 Press System Alignments Auto Align Off 6 Press Input Output RF calibrator 50 MHz 7 Verify the 50 MHz signal is at 25 dBm by pressing MODE MEAS Spectrum Analyzer O...

Страница 266: ...enter and verify Atten 10 dB 9 Refer to Figure 7 9 carefully disconnect W12 at A3J14 Figure 7 9 A3 Digital I F Cables 10 Connect the W12 cable to the MMCX female to SMA female connector Use an appropriate cable to go from the SMA connector to the RF input of a functioning spectrum analyzer 11 Press Freq 10 MHz Span 1 MHz Peak Search on the functioning spectrum analyzer If the analyzer is not in 10...

Страница 267: ... 7 10 A3 Digital I F Reference Input If the 22 5 MHz and 10 MHz signals measure the correct frequency and amplitude and yet the display is not processing the signal properly the most probable causes are the A3 Digital IF or the A4 CPU It is difficult to separate these two assemblies given the architecture of the analyzer Each assembly will have to be tried to see which one is causing the failure ...

Страница 268: ...268 Keysight NFA Series Noise Figure Analyzers Service Guide Analog Digital IF Troubleshooting 25 MHz BW IF Section ...

Страница 269: ...ind in This Chapter The following information is found in this chapter A14 L O Synthesizer Assembly Description on page 270 A14 L O Synthesizer Theory of Operation on page 271 A14 L O Synthesizer Troubleshooting on page 272 A16 Reference Assembly Description on page 280 A16 Reference Assembly Troubleshooting on page 282 ...

Страница 270: ...he A16 Reference Assembly The 1st L O is then phase locked to this 4800 MHz reference which is then phase locked back to the 10 MHz reference located on the A16 Reference Assembly The quality of the phase lock design that locks the 1st L O has a direct relationship on the overall stability of the analyzer Users can also provide their own external reference The frequency accuracy of the user freque...

Страница 271: ...put signals up to 44 GHz Brief Description of the Major Blocks The Field Programmable Gate Array FPGA L O Controller has the capability to perform automatic pretune update unlock detection reference signal phase adjustment and automatic segment sequencing using block RAM and its segment state machine The fractional N divider performs frequency division of the feedback VCO signal The VCO is a low n...

Страница 272: ...LED s DS1 DS3 located near the top of the board next to J10 should all be off See LED location in Figure 8 1 below Press System Alignments Align Now Align Now All If the alignment functions correctly with no error messages on the analyzer display most of the board is working properly Measure 4800 MHz Input frequency from A16 Reference Assembly Measure 4800 MHz Input Power from A16 Reference Assemb...

Страница 273: ...ncy Stability Turn on the analyzer and wait for the instrument to complete the boot up process Press MODE MEAS Spectrum Analyzer OK FREQ 4 2 GHz Zero Span Disconnect A14W6 cable at A14J200 see Figure 8 2 Connect A14W6 cable end to the RF input of the functioning spectrum analyzer Figure 8 2 W4 and W6 Location DS2 and DS3 will illuminate when the W6 cable is removed This is normal ...

Страница 274: ... Noise Figure Analyzers Service Guide L O Synthesizer Reference Troubleshooting A14 L O Synthesizer Troubleshooting The analyzer marker should read 4800 MHz at 4 5 dBm 2 dB as shown in Figure 8 3 Figure 8 3 4800 MHz Wide Span ...

Страница 275: ...rence Assembly is stable by pressing FREQ Span 50 kHz BW 1 kHz The signal on the functioning spectrum analyzer should be very stable both in frequency and power as shown in Figure 8 4 Reconnect the W6 cable to A14J200 Figure 8 4 4800 MHz Narrow Span If the 4800 MHz signal is not measuring the correct power level see the A16 Reference Assembly Troubleshooting section later in this chapter ...

Страница 276: ...onnect A14W4 cable at A14J740 Connect A14J740 1st LO output to the RF input of the functioning spectrum analyzer using a cable that will function up to 10 GHz Press Frequency 4 5225 GHz if the analyzer is NOT an N8973B or Frequency 5 7225 GHz if the analyzer is an N8973B Span 5 MHz Peak Search on the functioning spectrum analyzer If the functioning spectrum analyzer has a preselector peak or prese...

Страница 277: ...of the analyzer as per Table 8 1 and measure the LO output expected frequency and power using the functioning spectrum analyzer If the 4 5225 GHz or 5 7225 GHz signal is not measuring the correct power level the LO Synthesizer assembly is the most probable cause Perform the preselector peak or preselector centering on the functioning spectrum analyzer if any of the expected 1st L O power levels ar...

Страница 278: ...izer Troubleshooting Table 8 1 Center Frequency of analyzer MHz Expected 1st L O Frequency GHz A14J704 Expected 1st L O Power dBm A14J704 4200a 4 5225 16 5 3 dB 4300a 4 6225 16 3 dB 600 5 7225 16 3 dB 700 5 8225 see Figure 8 6 16 3 dB 2100 7 2225 16 3 dB 2200 7 3225 see Figure 8 7 16 3 dB a Does not apply to the N8973B ...

Страница 279: ...FA Series Noise Figure Analyzers Service Guide 279 L O Synthesizer Reference Troubleshooting A14 L O Synthesizer Troubleshooting Figure 8 6 5 8225 GHz 1st L O Measurement Figure 8 7 7 3225 GHz 1st L O Measurement ...

Страница 280: ...he Show Hardware screen allowing identification of the individual board part numbers comprising the complete assembly The reference signals and local oscillators can be phase locked to a timebase in one of two ways 1 The internal 10 MHz reference located on the A16 Main Board 2 An externally provided reference such as a house standard or the reference from another instrument or a base transceiver ...

Страница 281: ...gn Signal A16J701 2 4 GHz VCXO x 2 A9 Cal Signal Input Input Attenuator A 4 8 GHz High band alignment signal 50 MHz Ecal 300 MHz Comb Output A16J705 100 MHz VCXO 2 100 MHz VCXO x 3 A13J6 RF Front End Assembly 50 MHz Cal Signal or 300 MHz Comb for wideband I F phase linearity 100 MHz Ref A A16J707 100 MHz VCXO A19J901 Reserved for future use 100 MHz Ref C A16J717 100 MHz VCXO Not used Reserved for ...

Страница 282: ... using a functioning spectrum analyzer The board layout in Figure 8 8 and Figure 8 9 below identifies the input and output connectors and LEDs on the A16 Reference Assembly If these outputs measure correctly the A16 Reference Assembly is functioning correctly If not the Reference Assembly is the most probable cause provided the power supply is operating correctly Refer to A7 Midplane Assembly Trou...

Страница 283: ...8 10 4 8 GHz 2nd LO Out A16J702 4800 MHz 10 dBm 2 dB Press MODE MEAS Spectrum Analyzer OK Freq 1 GHz Zero Span on EXA Figure 8 11 4 8 MHz 1st LO Ref Out A16J703 4800 MHz 4 dBm Press MODE MEAS Spectrum Analyzer OK Freq 50 MHz Zero Span MEAS SETUP Advanced Phase Noise Optimization Best Close in PNoise on EXA Figure 8 12 50 MHz Ref Out A16J701 50 MHz 25 dBm Press Input Output RF Calibrator 50 MHz on ...

Страница 284: ...284 Keysight NFA Series Noise Figure Analyzers Service Guide L O Synthesizer Reference Troubleshooting A16 Reference Assembly Troubleshooting Figure 8 10 50 MHz Ecal Out Figure 8 11 4 8 GHz 2nd LO Out ...

Страница 285: ...eysight NFA Series Noise Figure Analyzers Service Guide 285 L O Synthesizer Reference Troubleshooting A16 Reference Assembly Troubleshooting Figure 8 12 4 8 GHz 1st LO Ref Out Figure 8 13 50 MHz Ref Out ...

Страница 286: ...286 Keysight NFA Series Noise Figure Analyzers Service Guide L O Synthesizer Reference Troubleshooting A16 Reference Assembly Troubleshooting Figure 8 14 4 8 GHz Ref Out Figure 8 15 2 4 GHz Ref Output ...

Страница 287: ...Keysight NFA Series Noise Figure Analyzers Service Guide 287 L O Synthesizer Reference Troubleshooting A16 Reference Assembly Troubleshooting Figure 8 16 300 MHz LO AIF Figure 8 17 100 MHz Ref B Out ...

Страница 288: ...288 Keysight NFA Series Noise Figure Analyzers Service Guide L O Synthesizer Reference Troubleshooting A16 Reference Assembly Troubleshooting Figure 8 18 10 MHz Output ...

Страница 289: ...ink 4 8 GHz calibrator unleveled 2 Blinks 50 MHz calibrator unleveled 3 Blinks 300 MHz LO_AIF unleveled Off Normal locked A16DS7 Green Is the 100 MHz PLL Unlocked On Normal locked Off Fault unlocked A16DS8 Green Is the 100 MHz VCXO working On Yes alive Off Fault not alive A16DS9 Green Is Internal 10 MHz Reference On On Yes enabled Off No disabled Ext Ref Mode A16DS10 Green Is the 15V Standby suppl...

Страница 290: ...290 Keysight NFA Series Noise Figure Analyzers Service Guide L O Synthesizer Reference Troubleshooting A16 Reference Assembly Troubleshooting ...

Страница 291: ...cessor Description on page 292 A4 Processor Assembly Troubleshooting on page 295 A5 Disk Drive Description on page 296 A5 Disk Drive Troubleshooting on page 299 Troubleshooting Software Related Issues on page 299 Reloading the Instrument Application Software on page 299 Disk Drive Recovery Process on page 300 Replacing the Instrument Disk Drive on page 301 Each section first describes how the asse...

Страница 292: ...1 disk drive interface board can be replaced if connector wear is an issue See Chapter 14 Replaceable Parts for the correct replacement part number Front Panel Interface The instrument USB bus is the electrical interface to the instrument front panel One of the USB ports on the host controller located on the A4 Processor assembly is routed to the A1A2 Front Panel Interface board for this use This ...

Страница 293: ...hen a power failure occurs The instrument will return to the same power state after a power failure Rear Panel Connectivity The A4 Processor assembly has direct access to the rear panel of the instrument The rear panel connections provided on the A4 Processor assembly are GPIB Interface Cabled PCIe x4 Interface LAN RJ45 10 100 1000 based T Ethernet port USB Ports 2 x Super Speed USB 3 0 Host Ports...

Страница 294: ...able See Chapter 14 Replaceable Parts for the correct replacement part number SD Memory Card Slot The main purpose for the SD memory card is for instrument calibration database backup The SD memory card that is shipped with each new instrument is currently a 16 GB SDHC card It is shipped with a backup of the instrument s factory calibration database The SD memory card can be removed if need for se...

Страница 295: ... by the BIOS Basic Input Output System Setup Utility If these settings are changed from those that the instrument was initially shipped with this could cause a problem with the booting and or functionality of the instrument If the instrument is having a problem booting up but is functional enough to enter the BIOS Setup Utility you will want to verify that the BIOS settings have not been changed A...

Страница 296: ... related The first step in troubleshooting is to determine if the failure is software related If software is found not to be the issue the disk drive should be replaced Before replacing the A5 disk drive it is highly recommended that the factory calibration data be backed up to an external drive if at all possible If this data is not backed up prior to replacing the disk drive all instrument adjus...

Страница 297: ... will be lost if the Instrument Image Recovery process is run D This partition is reserved for user data storage The My Documents folders for the user accounts that are preconfigured from the factory are mapped to the D partition This is for the convenience of backing up the user data You should always back up the data on the D partition This allows you to restore the data if the A5 Disk Drive ass...

Страница 298: ...re any of the following items Operating system configurations that were changed or updated after the instrument was shipped from the factory After a recovery these configurations will have to be redone by the end user Additional software that was installed be the end user After a recovery that software will need to be re installed by the end user Any updates that were made to the instrument measur...

Страница 299: ...ent application software Use the Disk Drive Recovery Process to reinstall the operating system and instrument application software to the state it was in when the instrument left the factory Reloading the Instrument Application Software The instrument application software contains all the required components for the instrument application as well as all software options If the instrument applicati...

Страница 300: ...s Boot Manager screen as shown in Figure 9 2 will be displayed for 5 seconds Figure 9 2 Windows Boot Manager 4 Press the down arrow key to move the highlight to Instrument Image Recovery System and press the Enter key 5 When the Instrument Image Recovery System has booted follow the on screen instructions to recover the image of the C partition 6 After exiting the Instrument Image Recovery System ...

Страница 301: ...oting A5 Disk Drive Troubleshooting Replacing the Instrument Disk Drive If the above two procedures did not resolve the booting issue the disk drive should be replaced Please refer to the Disk Drive on page 435 replacement section in Chapter 15 Assembly Replacement Procedures on page 389 ...

Страница 302: ...302 Keysight NFA Series Noise Figure Analyzers Service Guide CPU Disk Drive Troubleshooting A5 Disk Drive Troubleshooting ...

Страница 303: ... Troubleshooting What You Will Find in This Chapter The following information is found in this chapter A6 Power Supply Description on page 304 A6 Power Supply Basic Troubleshooting Cover On on page 310 A7 Midplane Description on page 312 A7 Midplane Assembly Troubleshooting on page 315 ...

Страница 304: ...circuit boards microcircuit assemblies front panel display and fans any of which can cause an over current condition if not operating correctly The power supply will remain on in an over current state for a minimum of 0 1 second The power supply will turn off no later than 0 4 seconds after the beginning of the over current state Any one output over current condition will latch the supply off unti...

Страница 305: ...e A6 Power Supply assembly are printed on the rear panel of the instruments as well as on the power supply itself While there are no test points or status LEDs accessible for troubleshooting on the A6 Power Supply assembly there are both test points and status LEDs for all of the different power supply voltages as well as other power supply status lines on the A7 Midplane Board assembly See the A7...

Страница 306: ...and does not perform the recommended operating system shut down of the instrument TEMP_SEN TEMP_SEN is an analog input to the fan speed control circuit The fan runs at a slow speed at room temperature to reduce noise and then will ramp up to full speed as the temperature increases Control Status Outputs There are a number of control and status outputs for the A6 Power Supply assembly They are PWRO...

Страница 307: ...ive even when the power is turned off Over Current Protection The A6 Power Supply assembly has built in over current protection that will shut down the supply if current draw from the instrument is too great The power supply will remain on in an over current state for a minimum of 1 second The power supply shall turn off no later than 5 seconds after beginning the over current state The power supp...

Страница 308: ... 7A 7 Volt Analog power supply 4 5 1 5 7A_Sense 15A 15 Volt Analog power supply 1 5 0 5 ACOM Analog Ground Connected to common ground inside power supply ACOM_Sense Remote sense for analog ground PS_Faultn Power supply fault output active low PS_Temp Analog temperature output Control element for fan speed Line_Trig Line Trigger Output Dither Dither input from A7 Midplane for switching frequency mo...

Страница 309: ..._Sense Remote sense for 3 35 digital supply DCOM Digital ground Connected to the common ground point inside the power supply DCOM_Sense Remote sense for DCOM PWR_OK Power OK Output PS_ONn Power supply turn on input active low ChassisCOM Power supply outer case Connected to common ground point inside the power supply Table 10 1 Power Supply Output Signals Signal Name Description Maximum Output Curr...

Страница 310: ...panel probe power connector can be used to check the 15 VDC 7 and 12 6 VDC 10 supplies The 12 6 VDC is produced by post regulating the 15 VDC supply A voltmeter can be used to verify these supplies Refer to Figure 10 2 for a diagram of the probe power connector Figure 10 2 Probe Power Connector If these initial checks are functioning properly and yet the signal analyzer will not boot up properly o...

Страница 311: ... also be referenced if this is the case As an example the A15 Front End Control Assembly may be pulling down the 15 volt supply that is used for the probe power on the front panel Chapter 2 describes the entire instrument boot process from initial power on to a successful signal analyzer sweep If any portion of the boot process fails Chapter 2 describes a step by step troubleshooting procedure to ...

Страница 312: ...nd the location of each can be seen in Figure 10 4 Additional Power Supply Regulation There are two analog power supply regulators on the A7 Midplane board assembly They are the 3 3VA and 5 2VA supplies The 3 3VA supply is regulated down from the instrument 5 1VA supply while the 5 2VA supply is regulated down from the 7VA instrument supply Both of these supply voltages have test points and LEDs o...

Страница 313: ...hing frequency for the purpose of lowering any power supply related interference If for some reason the level of the power supply related interference is higher than normal this circuitry or the A6 Power Supply assembly could be suspect Miscellaneous Circuitry Other circuitry on the A7 Midplane include a circuit to phase lock the CPU clock to the analyzer s 10 MHz reference and a Complex Programma...

Страница 314: ...F Assembly A3 Digital I F Assembly 2 A4 CPU Replacement Kit w o disk drive 3 A6 Power Supply 4 A16 Reference Assembly 5 A14 L O Synthesizer Assembly 6 A15 Front End Control Assembly 7 A7 Midplane Assembly The L O Synthesizer Front End Control Assembly Analog IF and Digital IF plug into the Motherboard All other assemblies mentioned plug into the Midplane from the rear of the instrument ...

Страница 315: ...suspect view the power supply LED s on the Midplane Assembly by removing the instrument outer cover See Figure 10 4 Figure 10 4 Midplane Assembly As shown above the Midplane Assembly has test points for each power supply that can be used as measurement points These DC voltages can be verified with a voltmeter Continuity measurements can also be performed on each power supply if a shorted condition...

Страница 316: ...y 32 2 0 1 3 kΩ 15A TP6 15 Volt Analog supply 15 1 0 260 Ω 15SB TP2 15 Volt Standby supply 15 1 0 264 Ω 12D TP16 12 Volt Digital supply 12 1 0 264 Ω 9A TP7 9 Volt Analog supply 9 1 0 120 Ω 5 2A TP5 5 2 Volt Analog supply 5 2 0 75 3 6 kΩ 5 1D TP15 5 1 Volt Digital supply 5 1 0 75 40 Ω 5 1SB TP17 5 1 Volt Standby 5 1 0 75 228 Ω 3 35D TP13 3 35 Volt Digital supply 3 35 0 75 47 Ω 3 3A TP10 3 3 Volt An...

Страница 317: ...igure Analyzers Service Guide 11 Front Panel Motherboard Troubleshooting What You Will Find in This Chapter The following information is found in this chapter A8 Motherboard Description on page 318 A1 Front Panel Assembly on page 320 ...

Страница 318: ...al assemblies in the instrument The main functions of this PC board include Distribute power Control and common signals between all the measurement PC boards including the A7 Midplane and the Front Panel Assembly Circuitry for fan speed control 10 MHz Reference distribution Figure 11 1 Motherboard The Motherboard is a horizontally mounted located near the bottom of the analyzer The Motherboard has...

Страница 319: ...7 Figure 11 2 Motherboard Connectors A8 Motherboard Troubleshooting There are no troubleshooting procedures for this assembly If the Motherboard is suspect it must be replaced Table 11 1 Motherboard Connector What Plugs In Motherboard Connector What Plugs In J1 A7 Midplane J11 A3 Digital I F analog signals J2 A7 Midplane J12 A3 Digital I F analog signals J3 A7 Midplane J31 Option Slot J4 A7 Midpla...

Страница 320: ... Panel Interface board is serviced as an assembly only no component level repair is supported The Front Panel Interface Board contains LCD control Inverter drive audio amplifiers internal speaker a 4 port USB hub and a USB keyboard microcontroller The two different front panel rubber keypads attach to the back side of the board which has the keyboard contacts printed on the reverse side The 4 port...

Страница 321: ...th 1 Block Diagram on page 324 RF Highband Path 2 Block Diagram on page 325 N8976B RF Low Freq Block Diagram on page 326 N8976B RF Highband Path 1 Block Diagram on page 327 N8976B RF Highband Path 2 Block Diagram on page 328 N8976B RF Highband Path 3 Block Diagram on page 329 Reference and Synthesizer Block Diagram on page 330 25 MHz Bandwidth I F System Block Diagram on page 331 NFA Computer Bloc...

Страница 322: ...322 Keysight NFA Series Noise Figure Analyzers Service Guide Block Diagrams Block Diagrams Block Diagrams ...

Страница 323: ... to AIF 322 5 MHz 29 dBm W37 Burst Trigger J1100 W16 W18 W22 J800 J700 J300 J302 Preselector J3 J3 J5 J10 J11 ATTENUATOR CONTROL LOW BAND SWITCH CONTROL PRESELECTOR DRIVER CONTROL X2 LOG DET J ALIGNMENT THERMOMETER RF Input VCO 10 to 10 mA DAC DAC LO DISTRIBUTION IF OUT from A13 NOTE Power levels based on these settings Mode Spectrum Analyzer unless specified differently Input Signal 50 MHz Calibr...

Страница 324: ...Bm W17 J903 J102 J301 to AIF 322 5 MHz 33 dBm W37 Burst Trigger J1100 W16 W18 W22 J800 J700 J300 J302 W8 Preselector J3 J3 J5 J10 J11 J6 ATTENUATOR CONTROL LOW BAND SWITCH CONTROL PRESELECTOR DRIVER CONTROL X2 LOG DET J ALIGNMENT THERMOMETER RF Input VCO 10 to 10 mA DAC DAC LO DISTRIBUTION FOOTNOTES BIAS TEE MIXER BIAS AMP BIAS PREAMP BIAS E ATTEN CONTROL SWITCH CONTROL 1st LO POWER OPTIMIZATION A...

Страница 325: ...IF OUT 322 5 MHz 18 dBm W17 J903 J102 J301 to AIF 322 5 MHz 19 dBm W37 Burst Trigger J1100 W16 W18 W22 J800 J700 J300 J302 W8 Preselector J3 J3 J5 J10 J11 J6 ATTENUATOR CONTROL LOW BAND SWITCH CONTROL PRESELECTOR DRIVER CONTROL X2 LOG DET J ALIGNMENT THERMOMETER RF Input VCO 10 to 10 mA DAC DAC LO DISTRIBUTION NOTE Power levels based on these settings Mode Spectrum Analyzer unless specified differ...

Страница 326: ...17 W26 Opt EXM J903 J102 J301 to AIF 322 5 MHz 23 dBm W37 Burst Trigger J1100 W16 W18 W22 J800 J700 J300 J302 J3 J3 J5 J10 J11 J6 ATTENUATOR CONTROL LOW BAND SWITCH CONTROL PRESELECTOR DRIVER CONTROL LOG DET J ALIGNMENT THERMOMETER RF Input VCO 10 to 10 mA DAC DAC LO DISTRIBUTION SWEEP RAMP NOTE Power levels based on these settings Mode Spectrum Analyzer unless specified differently RF Calibrator ...

Страница 327: ...EXT IF OUT W17 W26 Opt EXM J903 J102 J301 to AIF 322 5 MHz 35 dBm W37 Burst Trigger J1100 W16 W18 W22 J800 J700 J300 J302 W8 W7 Preselector J3 J3 J5 J10 J11 J6 ATTENUATOR CONTROL LOW BAND SWITCH CONTROL PRESELECTOR DRIVER CONTROL LOG DET J ALIGNMENT THERMOMETER RF Input VCO 10 to 10 mA DAC DAC LO DISTRIBUTION SWEEP RAMP NOTE Power levels based on these settings Mode Spectrum Analyzer unless specif...

Страница 328: ... OUT W17 W26 Opt EXM J903 J102 J301 to AIF 322 5 MHz 32 dBm W37 Burst Trigger J1100 W16 W18 J800 J700 J300 J302 J3 J3 J5 J10 J11 J6 ATTENUATOR CONTROL LOW BAND SWITCH CONTROL PRESELECTOR DRIVER CONTROL LOG DET J ALIGNMENT THERMOMETER RF Input VCO 10 to 10 mA DAC DAC LO DISTRIBUTION SWEEP RAMP NOTE Power levels based on these settings Mode Spectrum Analyzer unless specified differently Input Signal...

Страница 329: ...OUT W17 W26 Opt EXM J903 J102 J301 to AIF 322 5 MHz 36 dBm W37 Burst Trigger J1100 W16 W18 J800 J700 J300 J302 J3 J3 J5 J10 J11 J6 ATTENUATOR CONTROL LOW BAND SWITCH CONTROL PRESELECTOR DRIVER CONTROL LOG DET J ALIGNMENT THERMOMETER RF Input VCO 10 to 10 mA DAC DAC LO DISTRIBUTION SWEEP RAMP NOTE Power levels based on these settings Mode Spectrum Analyzer unless specified differently Input Signal ...

Страница 330: ...tput Tuned Freq 5 1225 GHz LO Synth Output Tuned Freq 322 5 MHz LO Synth Output Tuned Freq 322 5 MHz 2 LO Synth Output Tuned Freq 322 5 MHz 2 LO Synth Output Tuned Freq 322 5 MHz 4 3 6 8 4 GHz 8 4 13 6 GHz 13 6 17 1 GHz 17 1 26 5 GHz Band Tuning Equation J740 A16 REFERENCE A16A1 REFERENCE DAUGHTER to A2J300 EXT ECAL IN to A3J14 to A3J14 2nd LO CAL OUT ECAL OUT 300 MHz LO_AIF 100 MHz LO_SYNTH 10 dB...

Страница 331: ... P O W2 P O W2 P O COMB IN A3 DIGITAL IF X3 Sum Dither Digital Signal Processing Sweep Orchestration SPI Engine PCI PCI ILB Capture Memory Noise Source Drive X3 10 MHz LVDS 22 5 MHz IF TRIGGER 1 IN BNC ANALOG OUT BNC TRIGGER 1 OUT BNC TRIGGER 2 OUT BNC SYNC BNC DIGITAL BUS NOISE SOURCE DRIVE 28V BNC SNS NOISE SOURCE IF 10 MHz REF J13 J11 J5 J7 J6 J8 10 MHz OUT BNC 10 MHz Comb to A16 via P1 TRIGGER...

Страница 332: ...332 Keysight NFA Series Noise Figure Analyzers Service Guide Block Diagrams Block Diagrams NFA Computer Block Diagram ...

Страница 333: ...ns These technicians may be at a Keysight Service Center or at a self maintaining customer site There are two types of Service capabilities 1 Diagnostics These are available to any user and will assist in initial troubleshooting of instrument malfunctions Examples are the ability to read the mechanical relay cycles 2 Service Functions These are for use by the factory or field repair technicians ac...

Страница 334: ... Guide The Service Functions type of Service capability is defined above To access secured service capabilities the technician is required to enter a specific numeric Service Code that is controlled by the instrument software The Service Code is defined to be easily entered via the front panel an external keyboard or mouse will not be required Once access has been gained it persists within the exe...

Страница 335: ...ss To access the secure service capabilities press System Service with the instrument application running At this point you will see the window shown in Figure 13 1 Enter the Service Code and press Login The Service Code is 2061 Figure 13 1 Service Code Entry Figure 13 2 Secure Service Menus Accessed via System Service ...

Страница 336: ...336 Keysight NFA Series Noise Figure Analyzers Service Guide Service and Diagnostics Menus Overview Figure 13 3 Lock and LO Accessed via Spectrum Analyzer Mode Meas Setup Lock and LO ...

Страница 337: ...Keysight NFA Series Noise Figure Analyzers Service Guide 337 Service and Diagnostics Menus Overview Figure 13 4 Diagnostics Hardware Statistics Accessed via System Diagnostics ...

Страница 338: ...sight NFA Series Noise Figure Analyzers Service Guide Service and Diagnostics Menus Overview Figure 13 5 Service Diagnostics Corrections Menu Accessed via Spectrum Analyzer Mode Meas Setup Service Diagnostics ...

Страница 339: ...technician to adjust the 10 MHz reference timebase manually Timebase DAC Allows the technician the ability to adjust the 10 MHz reference timebase The adjustment is performed by changing the DAC setting controlling the reference Once the reference is adjusted to the proper frequency the DAC value can be saved in non volatile memory by pressing the Save menu key ...

Страница 340: ...start the measurement from the beginning A failure of ADC will set the Error Condition Align ADC failed A failure will not employ new ADC alignment data Successful completion of ADC will clear the Error Condition Align ADC failed The Advisory Event Alignment complete is displayed when the alignment is complete Align ADC can be interrupted by pressing the Cancel ESC front panel key When this occurs...

Страница 341: ...tart the measurement from the beginning A failure of IF will set the Error Condition Align IF failed A failure will not employ new IF alignment data Successful completion of IF will clear the Error Condition Align IF failed and clear bit 6 in the Status The Advisory Event Alignment complete is displayed when the alignment is complete Align IF can be interrupted by pressing the Cancel ESC front pan...

Страница 342: ...ose of improving small amplitude variations that occur as resolution bandwidth is switched This alignment is done by measuring the response of the current system state configuration to the 50 MHz amplitude reference signal All subsequent measurements are then compensated appropriately for absolute amplitude accuracy The instrument will stop any measurement currently underway perform the alignment ...

Страница 343: ... and Diagnostics Menus Service Key Descriptions Show Software The Show Software screen displays revision information for Keysight internal software that comprises the embedded application and programmable hardware devices FPGAs and PLDs Figure 13 6 Show Software Screen ...

Страница 344: ...f RF Flatness Video Shift On Off The Flatness Video Shift turns off the corrections for gain vs frequency It does not turn off the corrections for changes in the analog IF gain that accompany flatness changes This function turns both the gain and video shift on or off but does not affect the temperature corrections When set to off it is possible to measure the raw flatness of the spectrum analyzer...

Страница 345: ...ss is OFF the Advisory Event IF Flatness corrections OFF will be displayed When IF Flatness is ON the Advisory Event IF Flatness corrections OFF will be cleared Snapshot Alignments On Off During normal auto alignment operation the firmware will perform an RBW and IQ alignment when the analyzer RBW state is changed and every 10 minutes thereafter These alignments can hinder troubleshooting the anal...

Страница 346: ...nd Locked Band x where x is a value between 0 and 6 When band lock is not in affect the Advisory Event Band Locked Band x is cleared Dependencies Couplings 1 Band Lock is only available on analyzers with frequency range options beyond 3 6 GHz 2 The individual bands available for selection also depends upon the particular frequency range option Enter one of the following values 1 Turns Band Lock to...

Страница 347: ...cked Band x where x is a value between 0 and 6 When band lock is not in affect the Advisory Event LO Band Locked Band x is cleared Dependencies Couplings LO Bandlock will be grayed out if Bandlock is OFF If Harmonic Bandlock is any setting other than OFF LO Bandlock menu key is enabled If LO Bandlock is other than OFF and the Harmonic Bandlock is transitioned to OFF the LO Bandlock is set to OFF O...

Страница 348: ...ameter provides the ability to adjust the output gain of the 2nd LO DAC The range is from 0 to 4095 where 0 is the minimum gain and 4095 is the maximum gain Setting a value of 4096 or greater returns control to the instrument In External Mixing this DAC controls the level of the 1st LO signal at the front panel EXT MIXER connector External LO Turnoff Disconnects the 1st LO path which will minimize...

Страница 349: ...ar in the center of the screen Use two fingers to rotate the image 45 degrees clockwise Once this is completed rotate the image 45 degrees counter clockwise Zoom Test A small picture will appear in the center of the screen Use two fingers and spread them apart to scale the box until it fills the dotted rectangle around it The dotted rectangle will resize Pinch your fingers together to contract the...

Страница 350: ...350 Keysight NFA Series Noise Figure Analyzers Service Guide Service and Diagnostics Menus Front Panel Key Test ...

Страница 351: ...ion PRC Figure 14 5 CPU Assembly Figure 14 6 Disk Drive Tray Assembly Figure 14 7 Top Brace Figure 14 8 RF Area N8973B 74B 75B Figure 14 9 RF Area Millimeter Wave Instruments N8976B Figure 14 10 Front End Parts N8973B 74B 75B Figure 14 11 Front End Parts N8976B Figure 14 12 Front End Control Cables Figure 14 14 AIF DIF Cables Standard Instruments Figure 14 15 AIF DIF Cables bottom Standard Instrum...

Страница 352: ...web access or the parts you are interested in cannot be found in the parts list provided contact your local Keysight Technologies sales and service office with the following information Product model number Product serial number Description of where the part is located what it looks like and its function if known Quantity required For a list of Keysight Technologies sales and service office locati...

Страница 353: ... 40018 Top trim N9020 40005 Cover Plate N9020 00002 Screw flat head M3 x 0 5 6 mm long 2 included 0515 1946 Display Boot N9020 40002 Hole Plug 0 25 inch 6960 0076 The following are in the kit but not installed Side trim phantom gray adhesive 2 included 5041 7905 Keyboard overlayab N9020 80127 Keyboard overlayb N9020 80168 Keyboard overlayab N9000 80045 Overlay solid left N9020 80164 Overlay for CX...

Страница 354: ... 00078 A1MP13 RPG Knob W1312 40179 A1MP14 Shield N9020 00066 A1MP16 Reserved A1MP17 Reserved A1MP18 Reserved A1MP19 Reserved A1W1 Flex Circuit Display to Front Panel Control Board N9020 60273 A1W2 Cable Assembly Backlight N9020 60217 A2 Analog I F Assembly N9020 60011 A3 Digital I F Assembly N9020 60119 A3W1 Cable Assembly Smart Noise Source Wire Harness E4410 60163 A4 CPU Replacement Kit w o disk...

Страница 355: ... 33325 60020 A11 Low Band Switch Assembly N8973B E4410 60121 N8974B 75B E4410 60121 N8976B N9020 60051 A12 YTF Preselector not used in N8973B N8974B 75B 5087 7382 N8976B 5087 7383 A12MP1 Gap Pad YTF Base 5022 7179 A13 RF Front End Assembly N8973B 74B 75B N9020 60314 N8976B N9020 60315 A13A1 Bandpass Filter 0955 2469 A13W1 Cable Assembly A13J10 to A13A1 Input semi rigid N8973B 74B 75B E6607 21178 N...

Страница 356: ...inner W1312 00135 MP3 Chassis Side Left inner W1312 00136 MP4 Midplane Bracket W1312 00048 MP5 Chassis Front Bracket N9020 00059 MP6 Fan Bracket W1312 00137 MP7 Top Brace includes foam strips N9020 60018 MP8 Chassis Side Right Outer attaches to Low Band Switch bracket Attenuator brackets and Chassis bottom N9020 00034 MP9 Rear Panel Replacement Kit includes foam strip N9020 60298 MP10 Reserved MP1...

Страница 357: ...op Configuration Refer to note d Portable Configuration Option PRC N9020 40004d n a Front End Troubleshooting Kit N9020 60005 n a Front End Troubleshooting Bd E4410 60115 MP51 CPU Power Supply Guide Pin Grommets 8 pieces 0400 0353 MP52 50 Ω Termination for A13 1810 0118 MP53 Spiral Wrap 0890 0025 MP54 Rear Frame Lock Washer External Reference Cable 2190 0102 MP55 Rear Frame Lock Nut External Refer...

Страница 358: ... N9020 60046 W3 Cable Assembly A11J2 to A13J2 semi rigid N8973B 74B 75B N9020 20101 N8976B N9020 20131 W4 Cable Assembly A14J740 to A13J4 semi rigid N9020 20156 W5 Cable Assembly A16J702 to A13J1 semi rigid N9020 20064 W6 Cable Assembly A16J703 to A14J200 semi rigid N9020 20033 W7 Cable Assembly A12 Output to A13J9 semi rigid N8973B 74B 75B N9020 20124 N8976B N9010 20006 W8 Cable Assembly A11J3 to...

Страница 359: ...sembly A16J701 to A9 Cal Signal Input Port 2 semi rigid N8973B 74B 75B N9020 20065 N8976B N9010 20010 W20 Cable Assembly A13J6 to A16J705 Flexible Coax 8121 1400 W21 Reserved W22 Cable Assembly A15J300 to A12J1 Wire Harness N9020 60059 W23 Cable Assembly Ext Reference Cable rear frame to A16J704 Flexible Coax 8121 1402 W24 Reserved W25 Reserved W29 Reserved W36 Cable Assembly A15J902 to A13J7 Flex...

Страница 360: ...ot required for use on NFA instruments b Does not include nameplate See A1MP3 A1MP8 c Disk drive removable through rear panel d Front panel protective cover p n N9020 40004 is optimized only for use on analyzers with the porta ble configuration Opt PRC Although the cover will fit on analyzers with the benchtop configuration its use on benchtop configurations is not recommended Table 14 1 All Repla...

Страница 361: ... 0515 0658 M2 X 0 4 6 mm long Torx T 6 3 inch lbs Chassis Bottom Chassis Sides Midplane Front Bracket 15 0515 0372 M3 X 0 5 8 mm long Torx T 10 9 inch lbs Chassis Side Right Outside Low Band Switch Bracket Attenuator Brackets Chassis bottom 7 0515 0372 M3 X 0 5 8 mm long Torx T 10 9 inch lbs CPU Assembly Chassis 6 0515 0372 M3 X 0 5 8 mm long Torx T 10 9 inch lbs CPU Shield CPU Hard Disk Drive 19 ...

Страница 362: ... 7 14 mm long Torx T 20 21 inch lbs Front Chassis Bracket Midplane Bracket Chassis Sides 10 0515 0372 M3 X 0 5 8 mm long Torx T 10 9 inch lbs Front Frame Chassis 8 0515 2032 M3 X 0 5 8 mm long Torx T 10 9 inch lbs Front Frame Bottom Chassis 2 per 0515 2032 M3 X 0 5 8 mm long Torx T 10 9 inch lbs Front Panel Assy Chassis 6 0515 2032 M3 X 0 5 8 mm long Torx T 10 9 inch lbs Front Panel Daughter Board...

Страница 363: ...ear Frame Top Bracket Reference Assembly 4 0515 1946 M3 X 0 5 8 mm long Torx T 10 9 inch lbs RF Front End Assembly Chassis 4 0515 0372 M3 X 0 5 8 mm long Torx T 10 9 inch lbs RF Input Connector Chassis 2 0515 0372 M3 X 0 5 8 mm long Torx T 10 9 inch lbs Strap Handle Plugs Opt PRC Instrument Cover 4 0515 5209 M5 X 0 8 14 mm long Torx T 20 21 inch lbs Strap Handles Chassis Side 2 per 0515 0710 M4 X ...

Страница 364: ...cription Keysight Part Number 1 A2 Analog I F Assembly A3 Digital I F Assembly Refer to Table 14 1 2 A4 CPU Replacement Kit w o disk drive N9020 60247 3 A6 Power Supply 0950 5012 4 A16 Reference Assembly N9020 60200 5 A14 L O Synthesizer Assembly N9020 60118 6 A15 Front End Control Assembly Refer to Table 14 1 7 A7 Midplane Assembly N9020 63120 ...

Страница 365: ...onfiguration Table 14 4 Item Description Keysight Part Number 1 2 MP21 22 Strap Handles Benchtop Configuration includes screws N9020 60252 3 Screw M4 X 0 7 25 mm long 0515 1619 4 MP17 20 Rear Feet Benchtop Configuration 5041 7903 5 MP16 Dress Cover includes magnetic gasket and snaps N9010 00002 6 MP86 Accessory pouch N9010 60014 ...

Страница 366: ...em Description Keysight Part Number 1 Screw M4 X 0 7 14 mm long 0515 0435 2 MP49 Bail Handle Option PRC Portable Configuration N9020 60251 3 Screw M4 X 0 7 14 mm long 0515 0435 4 MP41 44 Front Bumpers Option PRC Portable Configuration N9020 40016 5 MP61 64 Strap Handle Plugs Option PRC Portable Configuration N9020 40014 6 Screw M5 X 0 8 14 mm long 0515 5209 ...

Страница 367: ...dware Figure 14 4 External Hardware Option PRC Table 14 6 Item Description Keysight Part Number 1 Screw M4 X 0 7 25 mm long 0515 1619 2 MP45 48 Rear Bumpers Option PRC Portable Configuration includes screws N9020 40015 3 MP16 Dress Cover includes magnetic gasket and snaps N9010 00002 ...

Страница 368: ...placeable Parts Hardware Figure 14 5 CPU Assembly Table 14 7 Item Description Keysight Part Number 1 A4 CPU Replacement Kit N9020 60202 2 A4BT1 CPU Board Battery CR2032 1420 0356 3 A4A1 Disk Drive Interconnect Board W1312 63079 4 Screw M3 x 0 5 8 mm long 0515 0372 ...

Страница 369: ...mber 1 A5 Disk Drive Replacement Kit N9020 60202 2 A5MP1 Disk Drive Tray W1312 40078 3 A5MP2 Disk Drive Rear Panel W1312 00103 4 A5MP3 Disk Drive Assembly Handle 1440 0421 5 Screw M3 x 0 5 8 mm long For rev 6 and earlier of drive tray For rev 7 and later use 0515 1035 M3 8 mm Flat HD 0515 0372 6 Screw M2 5 x 0 45 5 mm long 0515 2219 7 Screw M3 x 0 5 6 mm long 0515 1946 ...

Страница 370: ...de Replaceable Parts Hardware Figure 14 7 Top Brace Table 14 9 Item Description Keysight Part Number 1 MP7 Top Brace includes foam strips N9020 60018 3 Screw M3 X 0 5 8 mm long 0515 0372 4 Screw M3 X 0 5 6 mm long 0515 1946 5 Screw M3 X 0 5 8 mm long 0515 0372 ...

Страница 371: ... N8973B 5087 7382 W3 Cable Assembly A11J2 to A13J2 semi rigid N9020 20101 W7 Cable Assembly A12 Output to A13J9 semi rigid N9020 20124 W8 Cable Assembly A11J3 to A12 Input semi rigid N9020 20123 W9 Cable Assembly A10 Output to A11J1 semi rigid N9020 20153 W10 Cable Assembly J1 to A9 Input semi rigid N9020 20141 W11 Cable Assembly A9 Output to A10 Input semi rigid N9020 20142 W18 Cable Assembly A11...

Страница 372: ... 60051 4 A12 YTF Preselector not used in N8973B 5087 7383 W3 Cable Assembly A11J2 to A13J2 semi rigid N9020 20131 W7 Cable Assembly A12 Output to A13J9 semi rigid N9010 20006 W8 Cable Assembly A11J3 to A12 Input semi rigid N9010 20005 W9 Cable Assembly A10 Output to A11J1 semi rigid N9010 20004 W10 Cable Assembly J1 to A9 Input semi rigid N9020 20133 W11 Cable Assembly A9 Output to A10 Input semi ...

Страница 373: ...A1 Input semi rigid E6607 21178 A13W2 Cable Assembly A13J10 to A13A1 Input semi rigid N9020 20231 3 A12 YTF Preselector not used in N8973B 5087 7382 4 J1 Type N f RF Input Connector Assembly N8973B 74B 75B 5002 0702 5 A11 Low Band Switch Assembly E4410 60121 W3 Cable Assembly A11J2 to A13J2 semi rigid N9020 20101 W4 Cable Assembly A14J740 to A13J4 semi rigid N9020 20156 W5 Cable Assembly A16J702 t...

Страница 374: ...2 Input semi rigid N9020 20123 W10 Cable Assembly J1 to A9 Input semi rigid N9020 20141 W15 Cable Assembly A13J7 to A2J100 Flexible Coax 8121 1400 W17 Cable Assembly A13J12 to A15J102 Ribbon Cable E4410 60156 W20 Cable Assembly A13J6 to A16J705 Flexible Coax 8121 1400 Table 14 12 Item Description Keysight Part Number ...

Страница 375: ...3A1 Input semi rigid N9020 20229 A13W2 Cable Assembly A13J10 to A13A1 Input semi rigid N9020 20046 3 A12 YTF Preselector not used in N8973B 5087 7383 4 J1 2 4 mm m Input Connector Assembly N8976B N9030 60011 5 A11 Low Band Switch Assembly N9020 60051 W3 Cable Assembly A11J2 to A13J2 semi rigid N9020 20131 W4 Cable Assembly A14J740 to A13J4 semi rigid N9020 20156 W5 Cable Assembly A16J702 to A13J1 ...

Страница 376: ...2 Input semi rigid N9010 20005 W10 Cable Assembly J1 to A9 Input semi rigid N9020 20133 W15 Cable Assembly A13J7 to A2J100 Flexible Coax 8121 1400 W17 Cable Assembly A13J12 to A15J102 Ribbon Cable E4410 60156 W20 Cable Assembly A13J6 to A16J705 Flexible Coax 8121 1400 Table 14 13 Item Description Keysight Part Number ...

Страница 377: ...le 14 1 2 A14 L O Synthesizer Assembly N9020 60118 W4 Cable Assembly A14J740 to A13J4 semi rigid N9020 20156 W6 Cable Assembly A16J703 to A14J200 semi rigid N9020 20033 W16 Cable Assembly A9 A10 to A15J800 Ribbon Cable E4410 60157 W17 Cable Assembly A13J12 to A15J102 Ribbon Cable E4410 60156 W18 Cable Assembly A11J4 to A15J700 Ribbon Cable Refer to Table 14 1 W22 Cable Assembly A15J300 to A12J1 Wi...

Страница 378: ...A13J1 semi rigid N9020 20064 W6 Cable Assembly A16J703 to A14J200 semi rigid N9020 20033 W12 Cable Assembly A16J710 to A3J14 Flexible Coax 8121 1401 W14 Cable Assembly A16J711 to A2J300 Flexible Coax 8121 1401 W19 Cable Assembly A16J701 to A9 Cal Signal Input Port 2 semi rigid Refer to Table 14 1 W20 Cable Assembly A13J6 to A16J705 Flexible Coax 8121 1400 W23 Cable Assembly Ext Reference Cable rea...

Страница 379: ...Keysight NFA Series Noise Figure Analyzers Service Guide 379 Replaceable Parts Hardware Figure 14 14 AIF DIF Cables Standard Instruments Figure 14 15 AIF DIF Cables bottom Standard Instruments ...

Страница 380: ...ysight Part Number A3W1 Cable Assembly Smart Noise Source Wire Harness E4410 60163 W12 Cable Assembly A16J710 to A3J14 Flexible Coax 8121 1401 W13 Cable Assembly A2J601 to A3J15 Flexible Coax 8121 1411 W14 Cable Assembly A16J711 to A2J300 Flexible Coax 8121 1401 W15 Cable Assembly A13J7 to A2J100 Flexible Coax 8121 1400 ...

Страница 381: ...ssemblies Standard Instruments Table 14 17 Item Description Keysight Part Number 1 A2 Analog I F Assembly N9020 60011 2 A3 Digital I F Assembly N9020 60119 3 Screw M3 X 0 5 8 mm long 0515 0372 W2 Cable Interconnect from A2J820 to A3J20 N9020 60046 A3W1 Cable Assembly Smart Noise Source Wire Harness E4410 60163 ...

Страница 382: ...sis Side Right inner W1312 00135 MP3 Chassis Side Left inner W1312 00136 MP4 Midplane Bracket W1312 00048 MP5 Chassis Front Bracket N9020 00059 MP6 Fan Bracket W1312 00137 MP8 Chassis Side Right Outer attaches to Low Band Switch bracket Attenuator brackets and Chassis bottom N9020 00034 MP9 Rear Panel Replacement Kit includes foam strip N9020 60298 MP36 37 Attenuator Bracket Refer to Table 14 1 ...

Страница 383: ...es Noise Figure Analyzers Service Guide 383 Replaceable Parts Hardware Figure 14 18 Motherboard Table 14 19 Item Description Keysight Part Number 1 A8 Motherboard Assembly N9000 66404 2 Screw M3 X0 5 8 mm long 0515 0372 ...

Страница 384: ...alyzers Service Guide Replaceable Parts Hardware Figure 14 19 Fan Hardware Table 14 20 Item Description Keysight Part Number 1 B1 Fan 3160 4199 2 B2 Fan 3160 4199 3 MP25 26 Fan Guard 3160 0281 4 MP27 34 Rivet Fan Mounting 8 pieces 0361 1272 ...

Страница 385: ...5 0372 2 J1 Type N f RF Input Connector Assembly N8973B 74B 75B 5002 0702 J1 2 4 mm m Input Connector Assembly N8976B N9030 60011 3 EMI O Ring 18 75 mm ID used between RF Input Connector and Front Frame 8160 1637 4 Screw M3 X 0 5 8 mm long 0515 0372 W10 Cable Assembly J1 to A9 Input semi rigid N8973B 74B 75B N9020 20141 N8976B N9020 20133 5 MP83 Gusset Chassis near RF Input connector W1312 00093 ...

Страница 386: ...scription Keysight Part Number 1 A1MP14 Shield N9020 00066 2 A1A1 Front Frame N9020 60299 3 A1MP10 Bracket front panel shield N9020 00064 4 A1A2 Front Panel Control Board N9020 63274 5 A1MP11 Display Bracket Front Panel N9020 00078 A1W1 Flex Circuit Display to Front Panel Control Board N9020 60273 A1W2 Cable Assembly Backlight N9020 60217 ...

Страница 387: ...Keysight NFA Series Noise Figure Analyzers Service Guide 387 Replaceable Parts Hardware Figure 14 22 Front Frame Exploded View ...

Страница 388: ... 8 EMI Gasket a 9 A1A4 Keyboard PCA N9020 63294 10 A1A2 Front Panel Control Board N9020 63274 11 A1A3 Liquid Crystal Display 10 6 in w PCAP Touch 1280X768 Pixels 2090 1103 12 A1MP9 Display hold down compression pad N9020 40003 13 A1MP11 Display Bracket Front Panel N9020 00078 14 A1MP10 Bracket front panel shield N9020 00064 15 A1W1 Flex Circuit Display to Front Panel Control Board N9020 60273 16 A...

Страница 389: ... Area N8973B 74B 75B on page 399 RF Area N8976B on page 409 RF Front End Assembly N8973B 74B 75B on page 420 RF Front End Assembly N8976B on page 422 Front End Control Assembly on page 424 L O Synthesizer Assembly on page 427 Rear Panel on page 428 Reference Assembly on page 429 Power Supply Assembly on page 431 CPU Assembly on page 433 A5 Solid State Drive on page 435 Analog I F AIF Digital I F D...

Страница 390: ...ide The instrument contains static sensitive components Read the section entitled ESD Information on page 20 Safety The opening of covers or removal of parts is likely to expose dangerous voltages Disconnect the product from all voltage sources while it is being opened The instrument contains potentially hazardous voltages Refer to the safety symbols on the instrument and the general safety consid...

Страница 391: ...ble 16 1 on page 473 for information about post repair procedures If one or more instrument assemblies have been repaired or replaced perform the related adjustments and performance verification tests Table 15 1 Description Keysight Part Number TORX Hand Driver Size T 10 8710 1623 TORX Hand Driver Size T 20 8710 1615 9 16 inch nut driver 8720 0008 5 16 inch open end wrench source locally cable pul...

Страница 392: ...r Assembly Locations Major Assembly Locations Figure 15 2 Major Assemblies Table 15 2 Item Description 1 A2 Analog I F Assembly A3 Digital I F Assembly 2 A4 CPU Assembly 3 A6 Power Supply 4 A16 Reference Assembly 5 A14 L O Synthesizer Assembly 6 A15 Front End Control Assembly 7 A7 Midplane Assembly ...

Страница 393: ...ment 3 Using the T 20 driver remove the four screws including washers 3 two on each side that hold the rear feet 4 two on each side in place 4 Pull the instrument cover 5 off towards the rear of the instrument If the instrument is placed on its face during any of the following procedures be sure to use the front panel protective cover MP50 a soft surface or soft cloth to avoid damage to the front ...

Страница 394: ...wer 2 Slide the instrument cover back onto the deck from the rear The seam on the cover should be on the bottom Be sure the cover seats into the gasket groove in the Front Frame Assembly 3 Replace the four rear feet to the rear of the instrument two on each side Torque the rear feet screws to 21 inch pounds 4 Replace the handle straps on both sides of the instrument Torque the handle strap screws ...

Страница 395: ...C Removal 1 Disconnect the instrument from ac power Refer to Figure 15 4 Using the T 20 driver remove the four screws two on each side 1 that hold the bail handle 2 to the front frame Figure 15 4 Bail Handle Removal 2 Using the T 20 driver remove the four screws two on each side 6 that hold the strap handle plugs 5 in place ...

Страница 396: ...res Instrument Outer Case 3 Refer to Figure 15 5 Using the T 20 driver remove the four screws including washers 1 that hold the rear bumpers 2 two on each side in place Figure 15 5 Option PRC Instrument Outer Case Removal 4 Pull the instrument cover 3 off towards the rear of the instrument ...

Страница 397: ...sket groove in the Front Frame Assembly 3 Refer to Figure 15 4 Replace the strap handle plugs 5 in place and attach using the T 20 driver to replace the four screws two on each side 6 Torque to 21 inch pounds 4 Place the bail handle into position on the front frame and using the T 20 driver replace the four screws two on each side 1 that hold the bail handle 2 to the front frame Torque to 21 inch ...

Страница 398: ...r to Figure 15 6 To remove the Top Brace use the T 10 driver to remove the eight screws 3 0515 0372 attaching the Top Brace to the chassis Remove the twelve flathead screws 4 0515 1946 attaching the Top Brace to the chassis and boards Figure 15 6 Top Brace Removal Replacement 1 Refer to Figure 15 6 To replace the Top Brace place it into the correct position and attach the appropriate screws Torque...

Страница 399: ...cedures RF Area N8973B 74B 75B RF Area N8973B 74B 75B Refer to Figure 15 7 The RF area consists of RF attenuator A 1 RF attenuator B 2 low band switch assembly 3 and YTF Preselector 4 Figure 15 7 RF Area Components and Cables The YTF Preselector is not typically installed on the N8973B ...

Страница 400: ...s 1 Remove the instrument outer case Refer to the Instrument Outer Case removal procedure 2 Remove the top brace Refer to the Top Brace removal procedure 3 Remove the front panel Refer to the Front Frame Assembly removal procedure 4 Refer to Figure 15 8 Remove the chassis side right 1 by removing the thirteen screws 2 using the T 10 driver Figure 15 8 RF Bracket Removal ...

Страница 401: ...dard RF Microwave Instruments Removal 1 Refer to Figure 15 9 Remove the ribbon cable W18 2 Remove the semi rigid cables W3 W8 and W9 using the 5 16 inch wrench 3 Remove the two screws 2 using the T 10 driver The low band switch 1 can now be removed from the chassis Figure 15 9 Low Band Switch Removal W8 will not be present on the N8973B ...

Страница 402: ...nalyzers Service Guide Assembly Replacement Procedures RF Area N8973B 74B 75B 4 Refer to Figure 15 10 To separate the switch from the bracket remove the four screws 3 using the T 10 driver Figure 15 10 Low Band Switch and Bracket Separation ...

Страница 403: ...ting with the screw closest to the front of the instrument 3 Refer to Figure 15 9 Replace the semi rigid cables W3 W8 and W9 Torque to 10 inch pounds 4 Replace the ribbon cable W18 5 Refer to Figure 15 8 Position the chassis side right onto the chassis and replace the thirteen screws Torque to 9 inch pounds 6 Replace the front panel Refer to the Front Frame Assembly replacement procedure 7 Replace...

Страница 404: ...tenuator A 1 or Attenuator B 2 remove the semi rigid cables W9 W10 W11 and W19 attached to the attenuator using the 5 16 inch wrench 2 Remove the W16 ribbon cable attached to the attenuator 3 Remove the two screws 3 or 4 for each attenuator bracket to remove from the chassis using the T 10 driver 4 Remove the two screws to separate the attenuator from the bracket Figure 15 11 Attenuators Removal ...

Страница 405: ...e bracket so that the ribbon connector end is up 2 Replace the two screws that attach the attenuator to the bracket Torque to 9 inch pounds 3 Position the attenuator and bracket into the chassis and attach with the two screws Torque to 9 inch pounds 4 Replace the ribbon cable and semi rigid cables W9 W10 W11 and W19 to the attenuator Torque the semi rigid cables to 10 inch pounds ...

Страница 406: ...ce Guide Assembly Replacement Procedures RF Area N8973B 74B 75B YTF Preselector RF Microwave Instruments Removal 1 Refer to Figure 15 12 Remove cables W7 and W8 from the YTF Preselector 1 Figure 15 12 YTF Preselector Removal 2 Remove the wire harness W22 ...

Страница 407: ...ervice Guide 407 Assembly Replacement Procedures RF Area N8973B 74B 75B 3 Refer to Figure 15 13 From the bottom of the instrument remove the four screws 2 The YTF Preselector can now be removed from the chassis Figure 15 13 YTF Preselector Screws ...

Страница 408: ...f the gap pad Install the gap pad as shown with the pink side exposed Carefully peel off the clear plastic backing and smooth the gap pad into the recess Figure 15 14 Gap Pad Installation 3 Refer to Figure 15 13 Place the YTF Preselector into the chassis with the connectors toward the front of the instrument Replace the four screws 2 Torque to 9 inch pounds 4 Figure 15 12 Replace the cables W7 and...

Страница 409: ...Guide 409 Assembly Replacement Procedures RF Area N8976B RF Area N8976B Refer to Figure 15 15 The RF area consists of RF attenuator A 1 RF attenuator B 2 low band switch assembly 3 and YTF Preselector 4 Figure 15 15 RF Area Components and Cables N8976B ...

Страница 410: ...he instrument outer case Refer to the Instrument Outer Case removal procedure 11 Remove the top brace Refer to the Front Frame Assembly removal procedure 12 Remove the front panel Refer to the Front Frame Assembly removal procedure 13 Refer to Figure 15 16 Remove the chassis side right 1 by removing the thirteen screws 2 using the T 10 driver Figure 15 16 RF Bracket Removal ...

Страница 411: ...d Switch Removal 1 Refer to Figure 15 17 and Figure 15 18 Remove the ribbon cable W18 2 Remove the semi rigid cables W3 W8 and W9 using the 5 16 inch wrench 3 Remove the two screws 2 using the T 10 driver The low band switch and bracket 1 can now be removed from the chassis Figure 15 17 Low Band Switch Cable Removal ...

Страница 412: ...412 Keysight NFA Series Noise Figure Analyzers Service Guide Assembly Replacement Procedures RF Area N8976B Figure 15 18 Low Band Switch Removal ...

Страница 413: ...nalyzers Service Guide 413 Assembly Replacement Procedures RF Area N8976B 4 Refer to Figure 15 19 To separate the switch from the bracket remove the five screws 3 using the T 10 driver Figure 15 19 Low Band Switch and Bracket Separation ...

Страница 414: ...with the screw closest to the front of the instrument 3 Refer to Figure 15 17 Replace the semi rigid cables W3 W8 and W9 Torque to 10 inch pounds 4 Replace the ribbon cable W18 5 Refer to Figure 15 16 Position the chassis side right onto the chassis and replace the thirteen screws Torque to 9 inch pounds 6 Replace the front panel Refer to the Front Frame Assembly replacement procedure 7 Replace th...

Страница 415: ...Attenuator B 2 remove the semi rigid cables W9 W10 W11 and W19 attached to the attenuator using the 5 16 inch wrench 2 Remove the W16 ribbon cable attached to the attenuator 3 Remove the two screws 3 or 4 for each attenuator bracket to remove from the chassis using the T 10 driver 4 Remove the two screws to separate the attenuator from the bracket Figure 15 20 Attenuators Removal ...

Страница 416: ...acket so that the ribbon connector end is up 2 Replace the two screws that attach the attenuator to the bracket Torque to 9 inch pounds 3 Position the attenuator and bracket into the chassis and attach with the two screws Torque to 9 inch pounds 4 Replace the ribbon cable and semi rigid cables W9 W10 W11 and W19 to the attenuator Torque the semi rigid cables to 10 inch pounds ...

Страница 417: ...lyzers Service Guide 417 Assembly Replacement Procedures RF Area N8976B YTF Preselector Removal 1 Refer to Figure 15 21 Remove cables W7 and W8 from the YTF Preselector 1 Figure 15 21 YTF Preselector Removal 2 Remove the wire harness W22 ...

Страница 418: ...lyzers Service Guide Assembly Replacement Procedures RF Area N8976B 3 Refer to Figure 15 22 From the bottom of the instrument remove the four screws 2 The YTF Preselector can now be removed from the chassis Figure 15 22 YTF Preselector Screws ...

Страница 419: ...from the other side of the gap pad Install the gap pad as shown with the pink side exposed Carefully peel off the clear plastic backing and smooth the gap pad into the recess 2 Refer to Figure 15 22 Place the YTF Preselector into the chassis with the connectors toward the front of the instrument Replace the four screws 2 Torque to 9 inch pounds 3 Figure 15 21 Replace the cables W7 and W8 or W47 an...

Страница 420: ...ument top brace Refer to the Top Brace removal procedure 3 Remove the front panel Refer to the Front Frame Assembly removal procedure 4 Refer to Figure 15 24 Using the 5 16 inch wrench remove the cables W3 W4 W5 W7 W15 or W36 and W20 attached to the RF Front End Assembly 1 5 Remove the ribbon cable W17 from the RF Front End Assembly 6 Remove the four screws 2 using the T 10 driver The RF Front End...

Страница 421: ...he sequence shown starting with 1 2 Reattach ribbon cable W17 to the RF Front End Assembly 3 Reattach the cables W3 W4 W5 W7 W15 or W36 and W20 to the RF Front End Assembly 1 Torque the semi rigid cables to 10 inch pounds 4 Replace the front panel Refer to the Front Frame Assembly replacement procedure 5 Replace the instrument top brace Refer to the Top Brace replacement procedure 6 Replace the in...

Страница 422: ...e Refer to the Top Brace removal procedure 3 Remove the front panel Refer to the Front Frame Assembly removal procedure 4 Refer to Figure 15 25 Using the 5 16 inch wrench remove the cables W3 W4 W5 W7 W15 or W36 and W20 attached to the RF Front End Assembly 1 5 Remove the ribbon cable W17 from the RF Front End Assembly 6 Remove the four screws 2 using the T 10 driver The RF Front End Assembly can ...

Страница 423: ... pounds 2 Reattach ribbon cable W17 to the RF Front End Assembly 3 Reattach the cables W3 W4 W5 W7 W15 or W36 and W20 to the RF Front End Assembly 1 Torque the semi rigid cables to 10 inch pounds 4 Replace the front panel Refer to the Front Frame Assembly replacement procedure 5 Replace the instrument top brace Refer to the Top Brace replacement procedure 6 Replace the instrument outer case Refer ...

Страница 424: ...ce Refer to the Top Brace removal procedure 3 Refer to Figure 15 26 Remove the ribbon cables W16 W17 and W18 and the wire harness W22 from the Front End Control assembly 1 4 The Front End Control assembly can now be unplugged from the motherboard by leveraging up on the ejector and lifting the board up on the other side W22 will not be present on the N8973B N8976B will have the Enhanced Front End ...

Страница 425: ...A Series Noise Figure Analyzers Service Guide 425 Assembly Replacement Procedures Front End Control Assembly Figure 15 26 Front End Control Assembly Removal Figure 15 27 Enhanced Front End Control Assembly Cables ...

Страница 426: ...ejector 2 Reattach the ribbon cables W16 W17 and W18 and the wire harness W22 to the Front End Control assembly 1 If the instrument has the Enhanced Front End Control Assembly reattach the additional cables as shown in Figure 15 27 3 Replace the instrument top brace Refer to the Top Brace replacement procedure 4 Replace the instrument outer case Refer to the Instrument Outer Case replacement proce...

Страница 427: ... the 5 16 inch wrench 4 The L O Synthesizer assembly can now be unplugged from the motherboard by pulling up on the board and lifted out of the chassis Figure 15 28 L O Synthesizer Assembly Removal Replacement 1 Refer to Figure 15 28 Install the L O Synthesizer assembly into slot 5 in the chassis and press down to plug it into the motherboard 2 Reattach the cables W4 and W6 to the L O Synthesizer ...

Страница 428: ...e W23 cable from the A16 Reference Assembly 1 at A16J704 Figure 15 29 Rear Panel Removal Replacement 1 Reattach W23 cable to A16J704 or to the rear panel depending on how you removed it 2 Refer to Figure 15 29 Place the rear panel 1 into position in the chassis Replace the twenty screws 2 to attach the rear panel to the chassis Torque to 9 inch pounds 3 Replace the instrument outer case Refer to t...

Страница 429: ...Refer to the Instrument Outer Case removal procedure 2 Remove the four flathead screws securing the top brace to the Reference Assembly 3 Remove the rear panel Refer to the Rear Panel removal procedure 4 Refer to Figure 15 30 Remove cables W5 W6 W12 W14 W19 W20 and W23 from the reference assembly 1 Use the 5 16 inch wrench where necessary Figure 15 30 Reference Board Cables ...

Страница 430: ...ide the reference assembly into the slot at the rear of the instrument and push on the assembly to mate the connectors to the midplane assembly Secure with the ejector 2 Refer to Figure 15 31 Secure the reference support bracket 2 to the Reference assembly 1 using a pan head screw 3 0515 0372 3 Refer to Figure 15 31 and Figure 15 30 Reconnect the cables to the correct locations Torque the semi rig...

Страница 431: ...rocedure 3 Remove the top brace and reference bracket Refer to the Top Brace removal procedure 4 Remove the reference assembly Refer to the Reference Assembly removal procedure 5 Remove the CPU assembly Refer to the CPU Assembly removal procedure 6 Refer to Figure 15 32 Remove the three screws 1 attaching the power supply 2 to the power supply bracket 3 7 The power supply assembly can be removed f...

Страница 432: ...hree screws 1 through the power supply bracket 3 and into the power supply 2 Torque to 9 inch pounds 3 Replace the CPU assembly Refer to the CPU Assembly replacement procedure 4 Replace the reference assembly Refer to the Reference Assembly replacement procedure 5 Replace the top brace and reference bracket Refer to the Top Brace replacement procedure 6 Replace the rear panel Refer to the Rear Pan...

Страница 433: ... 33 CPU Assembly Rear Panel View 1 Refer to Figure 15 34 Remove the six screws 1 attaching the CPU assembly to the chassis 2 The CPU assembly can be removed from the chassis by pulling straight out the back Use the two ejectors to pull the CPU assembly out from the chassis If the A4BT1 CPU board battery was changed refer to Chapter 16 Post Repair Procedures for setup instructions ...

Страница 434: ... Assembly Removal Replacement 1 Slide the CPU assembly into the slot at the rear of the instrument and push on the assembly to mate the connectors to the midplane assembly Secure the board with the ejectors 2 Refer to Figure 15 34 Replace the six screws 1 that attach the CPU assembly to the chassis Torque to 9 inch pounds ...

Страница 435: ...cedures A5 Solid State Drive A5 Solid State Drive Disk Drive Removal 1 Refer to Figure 15 35 Loosen the thumb screw 2 and pull the SSD 1 out of the CPU assembly Figure 15 35 SSD Removal To remove the SSD or the memory card it is not necessary to remove the CPU assembly from the chassis ...

Страница 436: ...Place the new SSD into the tray assembly and attach with the four screws 5 0515 1035 Torque to 9 inch pounds 2 Refer to Figure 15 35 Slide the SSD into the CPU assembly and push to mate the connector Secure the thumb screw to 9 inch pounds Make sure not to use the 0515 0372 screw because for the PC6 processor it will cause the SSD to interfere with the CPU memory card Refer to Chapter 16 Post Repa...

Страница 437: ...cribed on page 436 Figure 15 37 CPU Memory Card Removal Disk Drive Interconnect Removal 1 Remove the A5 Disk Drive assembly for the instrument Refer to the A5 Solid State Drive removal procedure 2 Remove the A4 CPU assembly from the instrument Refer to the CPU Assembly removal procedure 3 Refer to Figure 15 38 Remove the A4 CPU assembly cover 1 by first removing the 19 flat head screws 2 and 3 pan...

Страница 438: ... Figure 15 38 A4A1 Disk Drive Interconnect Board Removal 4 Remove the 2 screws 4 that attached the A4A1 Disk Drive Interconnect board 5 to the A4 CPU assembly 5 Unplug and remove the A4A1 Disk Drive Interconnect board from the A4 CPU assembly by carefully sliding the board out towards the disk drive bay opening 6 ...

Страница 439: ...ing 6 2 Install the 2 screws 4 that secure the A4A1 Disk Drive Interconnect board to the A4 CPU assembly and torque them to 9 inch lbs 3 Replace the A4 CPU assembly cover 1 and attach it with 19 new flat head screws 2 and the 3 pan head screws 3 Torque all screws to 9 inch lbs 4 Re install the A4 CPU assembly into the instrument Refer to the CPU Assembly installation procedure 5 Re install the A5 ...

Страница 440: ...l I F DIF Assembly Removal 1 Remove the instrument outer case Refer to the Instrument Outer Case removal procedure 2 Remove the rear panel Refer to the Rear Panel removal procedure 3 Refer to Figure 15 39 Depending on the installed options remove the appropriate cables from the bottom of the DIF assembly Figure 15 39 W12 W13 Removal Standard Instruments ...

Страница 441: ...I F AIF Digital I F DIF Assembly 4 Refer to Figure 15 40 Pull the AIF DIF assembly part way out of the chassis Remove cables W13 or W41 W14 and W15 or W37 from the AIF assembly 5 The AIF DIF assembly can be removed from the chassis by pulling straight out the back Figure 15 40 AIF DIF Assembly Removal ...

Страница 442: ...he DIF 2 unplug ribbon cable W2 from the AIF assembly 2 Refer to Figure 15 41 From underneath the assembly remove the three screws 3 Figure 15 41 AIF DIF Separation AIF DIF Pre installation 1 Set the DIF in position over the AIF Reinstall the three screws removed before Torque to 9 inch pounds starting with the middle screw 2 To reconnect the AIF and the DIF reconnect the ribbon cable W2 ...

Страница 443: ...ument and push on the assembly to mate the connectors to the midplane assembly 2 Refer to Figure 15 40 Replace cables W13 W14 and W15 or W37 to the AIF assembly 3 Refer to Figure 15 39 Replace the appropriate cables to the bottom of the DIF assembly 4 Replace the rear panel Refer to the Rear Panel replacement procedure 5 Replace the instrument outer case Refer to the Instrument Outer Case replacem...

Страница 444: ... removal procedure 3 Remove the top brace and reference bracket Refer to the Top Brace removal procedure 4 Remove the reference assembly Refer to the Reference Assembly removal procedure 5 Remove the CPU assembly Refer to the CPU Assembly removal procedure 6 Remove the power supply assembly Refer to the Power Supply Assembly removal procedure 7 Refer to Figure 15 42 Remove the power supply support...

Страница 445: ...lacement Procedures Midplane Assembly 8 Refer to Figure 15 43 Remove the six screws 2 attaching the midplane assembly 1 to the midplane bracket The midplane assembly can now be pulled up from the chassis by leveraging up on the ejectors Figure 15 43 Midplane Assembly Removal ...

Страница 446: ... two screws Torque to 9 inch pounds 3 Replace the power supply assembly Refer to the Power Supply Assembly replacement procedure 4 Replace the CPU assembly Refer to the CPU Assembly replacement procedure 5 Replace the reference assembly Refer to the Reference Assembly replacement procedure 6 Replace the top brace and reference bracket Refer to the Top Brace replacement procedure 7 Replace the rear...

Страница 447: ...o the Power Supply Assembly removal procedure 7 Remove the AIF DIF assembly Refer to the Analog I F AIF Digital I F DIF Assembly removal procedure 8 Remove the Front End Control assembly Refer to the Front End Control Assembly removal procedure 9 Remove the L O Synthesizer assembly Refer to the L O Synthesizer Assembly removal procedure 10 Remove the Midplane assembly Refer to the Midplane Assembl...

Страница 448: ...448 Keysight NFA Series Noise Figure Analyzers Service Guide Assembly Replacement Procedures Motherboard Assembly Figure 15 44 Midplane Bracket Removal Figure 15 45 Bottom Screws ...

Страница 449: ...nalyzers Service Guide 449 Assembly Replacement Procedures Motherboard Assembly 15 Refer to Figure 15 46 Remove the left side chassis same side as the fan by removing the seven screws four on the bottom Figure 15 46 Chassis Side Removal ...

Страница 450: ... motherboard 1 into position in the chassis and replace the four screws 2 Torque to 9 inch pounds 2 Refer to Figure 15 46 Replace the left side chassis by replacing the seven screws Torque to 9 inch pounds 3 Refer to Figure 15 44 Replace the midplane bracket 1 by replacing the eight screws 2 Torque to 9 inch pounds 4 Replace the fan assembly Refer to the Fan Assemblyreplacement procedure 5 Replace...

Страница 451: ...trol Assembly replacement procedure 10 Replace the AIF DIF assembly Refer to the Analog I F AIF Digital I F DIF Assembly replacement procedure 11 Replace the power supply assembly Refer to the Power Supply Assembly replacement procedure 12 Replace the CPU assembly Refer to the CPU Assembly replacement procedure 13 Replace the reference assembly Refer to the Reference Assembly replacement procedure...

Страница 452: ...ase removal procedure 2 Remove the top brace Refer to the Top Brace removal procedure 3 Remove the Front Frame Assembly Refer to the Front Frame Assembly removal procedure 4 Refer to Figure 15 48 Remove the eight screws 1 that attach the fan assembly to the chassis Figure 15 48 Fan Assembly Removal 5 Unplug the fan wires from the motherboard The fan assembly can now be lifted from the chassis ...

Страница 453: ...se a small screwdriver to unscrew the rivet and remove it from the bracket Figure 15 49 Fan Replacement 2 Position the new fan on the work surface with the arrows pointing to the right and down 3 Orient the fan guard so that the rings are on the outside and that the V of the support legs are pointing to the neighboring fan 4 With the rivets center posts raised snap the rivets into place through th...

Страница 454: ...the fan assembly into position in the chassis Replace the eight screws 1 to attach the fan assembly to the chassis Torque to 9 inch pounds 3 Replace the Front Frame Assembly Refer to the Front Frame Assembly replacement procedure 4 Replace the top brace Refer to the Top Brace replacement procedure 5 Replace the instrument outer case Refer to the Instrument Outer Case replacement procedure ...

Страница 455: ...nt Frame Assembly Refer to the Front Frame Assembly removal procedure 3 Refer to Figure 15 50 Disconnect the semi rigid cable W10 from the Input Connector Assembly 2 Figure 15 50 Input Connector Assembly Removal 4 Remove the two screws 1 that attach the Input Connector Assembly 2 to the chassis The connector assembly can now be lifted from the chassis 5 To remove the gusset 5 remove the three scre...

Страница 456: ...sis Torque to 9 inch pounds 2 Reconnect the semi rigid cable W10 to the Input Connector Assembly Torque to 10 inch pounds 3 Place the gusset 5 in position and replace the three screws 4 that attach it to the chassis Torque to 9 inch pounds 4 Replace the Front Frame Assembly Refer to the Front Frame Assembly replacement procedure 5 Replace the instrument outer case Refer to the Instrument Outer Cas...

Страница 457: ...onnect semi rigid cable connection 2 on LO IF cable 3 Refer to Figure 15 51 Using the T 10 driver remove the eight screws 1 four on each side to detach the Front Frame Assembly from the chassis Figure 15 51 Front Frame Assembly Removal Make sure any connectors on the front panel are removed If the analyzer has Option PRC Portable Configuration and you want to remove the bail handle and bumpers fro...

Страница 458: ...igure 15 52 Front Panel Cable Replacement 1 Reattach the ribbon cable W1 2 Refer to Figure 15 51 Carefully position the Front Frame Assembly onto the chassis Ensure no cables are crushed Replace the eight screws 1 four on each side of the chassis Torque to 9 inch pounds 3 If Option EXM External Mixing is installed attach semi rigid LO IF cable Torque to 10 inch pounds 4 Replace the outer case Refe...

Страница 459: ...efer to Figure 15 53 Using the T 20 driver remove the four screws 1 two on each side to detach the Bail Handle Assembly 2 from the front frame 2 Using the T 20 driver remove the two screws 3 on each front bumper 4 and remove from the front frame 3 When replacing these parts torque to 21 inch pounds Figure 15 53 Bail Handle and Front Bumpers Removal ...

Страница 460: ... Access to any of the Front Frame assemblies requires removal of the Front Frame Assembly from the chassis Table 15 3 Front Frame Parts Item Description 1 A1MP14 Shield 2 A1A1 Front Frame 3 A1MP10 Bracket front panel shield 4 A1A2 Front Panel Control Board 5 A1MP11 Display Bracket Front Panel A1W1 Flex Circuit Display to Front Panel Control Board A1W2 Cable Assembly Backlight ...

Страница 461: ...Keysight NFA Series Noise Figure Analyzers Service Guide 461 Assembly Replacement Procedures Front Frame Assembly Figure 15 55 Front Frame Exploded View ...

Страница 462: ...Main Keypad 7 Braided Gasket 8 EMI Gasket 9 A1A4 Keyboard PCA 10 A1A2 Front Panel Control Board 11 A1A3 Liquid Crystal Display 10 6 in w PCAP Touch 1280X768 Pixels 12 A1MP9 Display hold down compression pad 13 A1MP11 Display Bracket Front Panel 14 A1MP10 Bracket front panel shield 15 A1W1 Flex Circuit Display to Front Panel Control Board 16 A1W2 Cable Assembly Backlight 17 A1MP14 Shield 18 W1 Cabl...

Страница 463: ...ure 15 56 Front Panel Shield 1 Refer to Figure 15 56 Remove ribbon cable W1 2 To remove the front panel shield 1 remove the eight screws 2 0515 0372 3 When replacing the front panel shield torque all screws to 9 inch pounds When replacing ribbon cable W1 press firmly on each side to ensure the hooks catch on the boards mating connector ...

Страница 464: ...er to Figure 15 54 Remove cables A1W1 and A1W2 2 When replacing the cables dress in the appropriate cable clamps Front Panel Control Board and Shield 1 Refer to Figure 15 57 To remove the Front Panel Control Shield 1 remove the two screws 2 0515 1946 and the two screws 3 0515 0372 Figure 15 57 Front Panel Control Shield and Board Removal ...

Страница 465: ... 465 Assembly Replacement Procedures Front Frame Assembly 2 Refer to Figure 15 58 To remove the Front Panel Control board 1 remove the seven screws 2 0515 0372 When replacing the board torque the screws to 9 inch pounds Figure 15 58 Front Panel Control Board ...

Страница 466: ...ssembly Display Assembly Removal 1 Refer to Figure 15 59 Remove the four screws 2 0515 0372 and the seven screws 3 0515 1946 The display assembly 1 can now be lifted out of the front frame When replacing the display assembly in the front frame torque the screws to 9 inch pounds Figure 15 59 Display Removal ...

Страница 467: ...nt Procedures Front Frame Assembly 2 Refer to Figure 15 60 To separate the display and display holddown from the display bracket remove the four screws 1 0515 0365 When reassembling the display assembly torque the screws to 2 inch pounds Figure 15 60 Display and Bracket Separation ...

Страница 468: ...board Keypad 1 Refer to Figure 15 61 Remove the RPG knob by carefully pulling it off the shaft To remove the keyboard 1 remove the eight screws 2 0515 0430 When replacing the keyboard into the front frame torque the screws to 9 inch pounds Replace the RPG knob by firmly pushing it onto the shaft Figure 15 61 Keyboard ...

Страница 469: ...re 15 62 To separate the keypad from the keyboard pull the keypad away from the keyboard to release the multiple rubber tabs Figure 15 62 Keyboard Keypad Separation 3 Remove the protective film from the new keypad if replacing Lay the keypad on the keyboard and pull up on the tabs from the back of the board to seat them in place ...

Страница 470: ...470 Keysight NFA Series Noise Figure Analyzers Service Guide Assembly Replacement Procedures Front Frame Assembly ...

Страница 471: ...e three things you should do before starting any of the procedures listed or described in this chapter Familiarize yourself with the safety symbols and read the general safety considerations and the safety note definitions in the front of this guide before you begin the procedures in this chapter Check that the analyzer has been turned on and allowed to warm up Ensure that the analyzer is operatin...

Страница 472: ...r performance verification test Making the recommended adjustments and or performance verification tests doesn t guarantee all published specifications are being met Only a full instrument calibration will do this The following procedures are also included in the Additional Tasks on page 476 Calibration Data Backup and Restore BIOS Settings Verification Operating System Initialization FPGA Synchro...

Страница 473: ... Assembly FPGA Synchronizationb Power Bandwidth Accuracy Resolution Bandwidth Switching Uncertainty Residual Responses Displayed Average Noise Level I F Frequency Response Absolute Amplitude Accuracy Display Scale Fidelity A4 CPU Assembly BIOS Settings Verificationb Set Instrument Time and Datec Residual Responses Displayed Average Noise Level A4BT1 Battery BIOS Settings Verificationb Set Instrume...

Страница 474: ...lope Preamp On Residual Responses Displayed Average Noise Level Spurious Responses Third Order Intermodulation Second Harmonic Distortion Absolute Amplitude Accuracy Frequency Response All Tests A13 Front End Assembly Frequency Response All Tests Attenuator Slope Attenuator Slope Preamp On Residual Responses Displayed Average Noise Level Spurious Responses Third Order Intermodulation Second Harmon...

Страница 475: ...eysight com find calibrationsoftware b See the Additional Tasks section in this chapter for detailed instructions on this task c To set the instrument time and date press Windows icon Start Control Panel Clock Lan guage and Region Date and Time d Before replacing the A5 Disk Drive see the Calibration Data Backup and Rest36ore section in this chapter for details e See Chapter 18 Instrument Software...

Страница 476: ...rocedure to be run will depend on whether the software will run or not If the Instrument Software Application Will Run 1 Connect a USB keyboard and mouse to two of the instrument rear panel USB ports 2 Connect a USB FLASH drive to one of the front panel USB port 3 Press System Alignments Backup or Restore Align Data 4 After the XSA application closes the Alignment Data Wizard window as shown in Fi...

Страница 477: ...e If the Instrument Software Application Will Not Run 1 Connect a USB mouse to one of the instrument front panel USB ports 2 Connect a USB FLASH drive to the other front panel USB port 3 Using the mouse double click on the Windows Explorer link on the desktop and navigate to the following folder C Program Files Agilent SignalAnalysis Physics 4 Double click on BackupAndRestore exe and the window sh...

Страница 478: ...drive and press OK 7 Select Backup and wait for the calibration database to be backed up 8 When the backup has completed close the Calibration Data Backup And Restore window While you can use the Make New Folder button in the Browse For Folder dialog box to create a sub folder on the USB FLASH drive and you can specify a filename in the Specify Backup Folder or File Name window you can also just u...

Страница 479: ...was earlier used to backup the instrument calibration file and insert it into one of the instrument front panel USB ports 3 Restore the instrument calibration data by pressing System Alignments Backup or Restore Align Data The Alignment Data Wizard window as shown in Figure 16 1 will appear 4 Follow the on screen instruction to restore the previously saved calibration data from the USB FLASH drive...

Страница 480: ...rument may not boot up or operate correctly Default BIOS Settings 1 Connect an external USB keyboard to one of the front panel USB ports 2 Turn on instrument power 3 Confirm Keysight Technologies splash screen comes up within a few seconds 4 Press the key on the keyboard specified on the initial boot screen to enter the setup utility 5 Navigate to the Exit screen and select Restore Defaults or Loa...

Страница 481: ... This will take just a few minutes to complete and will require very little user interaction Initialization 1 With the new disk drive installed power the instrument on 2 Within a few seconds you will see the initial Keysight Technologies splash screen and then the boot selection menu as seen in Figure 16 3 3 Allow the instrument to boot the Windows operating system This will happen automatically a...

Страница 482: ...essage window will appear as shown in Figure 16 4 Figure 16 4 License Agreement Window 5 Select Agree to continue with the operating system initialization If the initialization process would like to be postponed select Do Not Agree at this time to safely shut the instrument off The next time this disk drive is powered on this process will be restarted ...

Страница 483: ...he initialization process Once this process has completed the Anti Virus Message will appear as shown in Figure 16 5 At this point the operating system initialization process will be completed and either selection can be made or the instrument can be powered off Figure 16 5 Anti Virus Message 7 The disk drive in use is now ready for further configuration ...

Страница 484: ... assemblies that need to be updated and will update them to the correct revision 1 Close the instrument application software by pressing System Exit Program OK using the front panel keys 2 Connect a USB mouse to one of the instrument front panel USB ports 3 Using the mouse double click on the Windows Explorer link on the desktop and navigate to the following folder C Program Files Agilent SignalAn...

Страница 485: ...Figure 16 6 will appear Figure 16 6 FPGA Programming Utility 6 To program the FPGA code enter 1 and press Enter You will need to confirm this selection by pressing 1 and Enter one more time 7 The programming of the FPGA code could take a few minutes to complete Once it has finished the instrument will reboot itself to use the new code and this process will then be completed ...

Страница 486: ...turning the instrument to the capability that was available prior to the A7 Midplane board assembly replacement To program the model and serial numbers into a replacement A7 Midplane board assembly the N7800A Keysight Calibration Application Software will be required Information regarding N7800A Keysight Calibration Application Software can be found at http www keysight com find calibrationsoftwar...

Страница 487: ...ions using a minimum set of test equipment If a test does not pass performance verification tests must be run to determine whether a problem exists Functional tests use a minimum set of test equipment to check a much smaller range of parameters and a limited number of data points for each parameter than do performance verification tests Functional tests use limits that are wider than the published...

Страница 488: ...ed test equipment refer to individual instrument documentation for warm up specifications 4 Ensure that the analyzer s frequency reference is set to Internal a Press the Input Output Freq Ref Input keys b If the Freq Ref Input does not show Internal press the Freq Ref Input softkey and select Internal 5 Following instrument warm up perform the auto align routine Press System Alignments Align Now A...

Страница 489: ... MHz to 26 5 GHz VSWR 1 1 1 83059B 1250 1749 N8976B 2 4 mm f to 2 4 mm f Frequency 10 MHz to 44 GHz VSWR 1 1 1 11900B N8976B 2 4 mm f to 3 5 mm f connector saver for source Frequency 10 MHz to 26 5 GHz VSWR 1 1 1 11901B All BNC f to SMA m Frequency 40 MHz 1250 1200 All Type N f to Type N f Frequency 10 MHz to 18 GHz VSWR 1 05 1 1250 1472 1250 0777 All Type N m to 3 5 mm m Frequency 10 MHz to 18 GH...

Страница 490: ... PSGb 83630B 83640B 83650B Power Meter All Power Meter Power Reference Accuracy 1 2 Compatible with power sensor E4418B E4419B All Power Sensor Frequency 50 MHz to 3 66 GHz Amplitude 70 to 10 dBm 8481D 8487D 8485D N8973B 74B Power Sensor Frequency 50 MHz to 13 66 GHz Amplitude 30 to 20 dBm 8481A N8481A N8975B Power Sensor Frequency 50 MHz to 26 5 GHz Amplitude 30 to 20 dBm 8485A N8485A N8976B Powe...

Страница 491: ...ter Nominal Insertion Loss 6 dB Tracking Between Ports 0 25 dB 11667A 11667B All Termination 50 Ω Type N m Connector Frequency 30 Hz to 26 5 GHz 909A Option 012 N8976B Termination 50 Ω 2 4 mm f Connector Frequency 9 kHz to 44 GHz 85138B a Maximum frequency equal to or greater than the maximum frequency of the NFA b PSG model numbers E8244A E8254A E8247C Option 520 E8247C Option H31 or 540 E8257D O...

Страница 492: ...e The measurement is then averaged and the result is normalized to a 1 Hz bandwidth Figure 17 1 DANL Test Setup Procedure 1 Configure the equipment as shown in Figure 17 1 2 Press MODE MEAS Select Spectrum Analyzer mode Swept SA measurement Normal view Press OK Press Mode Preset on the analyzer 3 Set up the signal analyzer by pressing FREQ Center Frequency 10 MHz Input Output Input RF Coupling sel...

Страница 493: ...le 17 2 on page 492 9 Normalize the measured value to a 1 Hz BW by adding 30 dB to the measured value 10 Enter the normalized value of the displayed average noise level in Table 17 2 on page 492 11 The value of the normalized displayed average noise should be less than the specification value 12 Change the analyzer center frequency to the next value listed in Table 17 2 on page 492 Press FREQ Cent...

Страница 494: ...d Average Noise Level DANL Results Center Frequency Measured Average Noise Level dBm Normalized Average Noise Level 1 Hz BW dBm Test Limits dBm N8973B 74B 75B Test Limits dBm N8976B 10 MHz 145 150 2 GHz 145 149 6 GHz 144 142 13 GHz 140 144 20 GHz 133 142 26 5 GHz 129 139 30 GHz N A 135 35 GHz N A 130 40 GHz N A 130 43 5 GHz N A 130 ...

Страница 495: ...e frequency standard for the analyzer and signal source 0 25 span 5 RBW 2 Hz 0 5 horizontal resolution Item Critical Specification for this test Recommended Keysight Model Adapter Type N m to 3 5 mm f a Frequency 10 MHz to 1 51 GHz VSWR 1 1 1 1250 1744 Adapter 3 5 mm f to 3 5 mm f a Frequency 10 MHz to 1 51 GHz VSWR 1 1 1 83059B Adapter 2 4 mm f to 2 4 mm f b Frequency 10 MHz to 1 51 GHz VSWR 1 1 ...

Страница 496: ...w Press OK Press Mode Preset Input Output Freq Ref Input Freq Ref Input External FREQ Center Frequency 1505 MHz Span 2990 MHz Trace Detector Sample Single Cont to place analyzer in Single Sweep 4 Press Restart Press Peak Search on the analyzer If the instrument is functioning correctly the marker reading in the active function block will be between the values listed in Table 17 4 Record the marker...

Страница 497: ...Results Span MHz Center Frequency MHz Minimum Marker Frequency Readout Maximum 2990 1505 1495 9 MHz 1514 1 MHz 127 2 1505 1504 56 MHz 1505 44 MHz 54 1 1505 1504 8122 MHz 1505 1878 MHz 7 95 1505 1504 97240 MHz 1505 0276 MHz 0 106 1505 1504 999630 MHz 1505 000370 MHz 1 98 517 59 517 58316 MHz 517 59684 MHz 1 98 832 50 832 49316 MHz 832 50684 MHz ...

Страница 498: ...ignal at the input mixer the distortion product should be suppressed by 60 dBc The equivalent Second Harmonic Intercept SHI is 45 dBm 15 dBm 60 dBc This test is performed with 10 dBm at the mixer and verifies the distortion product is suppressed by 55 dBc This ensures the SHI is also 45 dBm 10 dBm 55 dBc Applied Frequency Mixer Level Distortion 40 MHz 10 dBm 55 dBc Item Critical Specifications for...

Страница 499: ...p the synthesized sweeper by pressing Frequency 40 MHz Amplitude 10 dBm 4 Set up the signal analyzer by pressing Input Output Freq Ref Input Freq Ref Input External FREQ Center Frequency 40 MHz Span 1 MHz 5 On the analyzer press Peak Search 6 Adjust the synthesized sweeper amplitude for a signal analyzer display of 10 dBm 0 1 dB 7 On the analyzer activate the marker delta function by pressing the ...

Страница 500: ...monic Distortion SHD 9 Press Peak Search Enter the displayed value under the Measured Second Harmonic Distortion dBc heading in Table 17 5 Table 17 5 Second Harmonic Distortion Results Applied Frequency MHz Measured Second Harmonic Distortion dBc Mixer Level dBm Specification dBc 40 10 55 ...

Страница 501: ...n the signal analyzer The source amplitude is measured by the power meter and signal analyzer at each setting and the values compared The difference between each pair of measurements indicates the amplitude accuracy Item Critical Specifications Recommended Keysight Model Adaptera Type N m to 3 5 mm m 1250 1743 Adaptera 3 5 mm f to 3 5 mm f 83059B Adapterb 2 4 mm f to 3 5 mm m 11901A Adapterb 2 4 m...

Страница 502: ...t for the analyzer has not been performed within the past 24 hours press System Alignments Align Now Align Now All to perform the auto alignment routine 4 Press MODE MEAS Select the Spectrum Analyzer mode Swept SA measurement and Normal view Press OK Press Mode Preset 5 Set up the synthesized sweeper by pressing CW 50 MHz Power Level 4 dBm RF On 6 Set up the signal analyzer by pressing Input Outpu...

Страница 503: ...e source amplitude as measured by the power meter in the Power Meter Amplitude column of Table 17 6 e On the signal analyzer press Restart f Wait for the signal analyzer to finish averaging g Press Peak Search h Record the signal amplitude as measured by the analyzer in the Measured Amplitude column of Table 17 6 i Calculate the signal amplitude accuracy error using the following equation and reco...

Страница 504: ...ation to 0 dB 5 Set the Span as listed in Table 17 7 6 Record the source amplitude as measured by the power meter in the Power Meter Amplitude column of Table 17 7 7 On the signal analyzer press Restart 8 Wait for the analyzer to finish averaging 9 Press Peak Search 10 Record the signal amplitude as measured by the analyzer in the measured amplitude column of Table 17 7 11 Calculate the signal amp...

Страница 505: ... to 3 6 GHz 1 7 dB 3 6 GHz to 7 0 GHz 3 0 dB 7 0 GHz to 13 6 GHz 3 5 dB 13 6 GHz to 26 5 GHz 4 2 dB 26 5 GHz to 34 5 GHz 3 5 dB 34 5 GHz to 44 GHz 4 2 dB Item Critical Specifications for this test Recommended Keysight Model Adapter Type N m to 3 5 mm m a Frequency 10 MHz to 18 GHz VSWR 1 1 1 1250 1743 Adapter 3 5 mm f to 3 5 mm f a Frequency 10 MHz to 26 5 GHz VSWR 1 1 1 83059B Cable 3 5 mm 1 mete...

Страница 506: ...alyzer s built in auto alignment has been performed within the last 24 hours Power Splittera Frequency Range 50 MHz to 26 5 GHz Tracking between ports 0 25 dB 11667B Power Splitterb Frequency Range 50 MHz to 44 GHz Tracking between ports 0 4 dB 11667C Synthesized Sweeper Frequency Range 50 MHz to maximum frequency of NFA PSG a For N8973B 74B 75B b For N8976B Item Critical Specifications for this t...

Страница 507: ... Refer to Table 17 8 Frequency Response Flatness Results Enter the amplitude of the signal displayed on the signal analyzer into the MeasAmp column of Table 17 8 11 Enter the power meter reading into the PowerMeter column of Table 17 8 12 Tune the synthesized sweeper and signal analyzer to the next frequency listed in Table 17 8 13 Enter the power sensor calibration factor into the power meter 14 ...

Страница 508: ...t Powermeter Meas Error Measerror Flatness Normalized to 50 MHz FlatNorm Flatness Error Test Limits dB 50 MHz 0 Ref 1 GHz 1 7 dB 2 GHz 1 7 dB 3 GHz 1 7 dB 3 5 GHz 1 7 dB 4 GHz 3 0 dB 6 GHz 3 0 dB 8 GHz 3 5 dB 9 GHz 3 5 dB 11 GHz 3 5 dB 13 GHz 3 5 dB 14 GHz 4 2 dB 17 GHz 4 2 dB 20 GHz 4 2 dB 23 GHz 4 2 dB 26 GHz 4 2 dB 29 GHz 3 5 dB 32 GHz 3 5 dB 35 GHz 4 2 dB 38 GHz 4 2 dB 41 GHz 4 2 dB 42 5 GHz 4...

Страница 509: ...50 MHz Frequency Range Limit Relative to 50 MHz 100 kHz to 3 6 GHz 2 0 dB 3 6 GHz to 8 4 GHz 3 0 dB 8 4 GHz to 13 6 GHz 3 5 dB 13 6 GHz to 26 5 GHz 4 0 dB 26 5 GHz to 34 5 GHz 4 5 dB 34 5 GHz to 44 GHz 6 0 dB Item Critical Specifications for this test Recommended Keysight Model Adapter Type N m to 3 5 mm m Frequency 10 MHz to 18 GHz VSWR 1 1 1 1250 1743 Adapter 3 5 mm f to 3 5 mm f Frequency 10 MH...

Страница 510: ...26 5 GHz Amplitude Range 65 dBm to 55 dBm 8485D Power Sensorb Frequency Range 50 MHz to 44 GHz Amplitude Range 65 dBm to 55 dBm 8487D Power Splittera Frequency Range 50 MHz to 26 5 GHz Tracking between ports 0 25 dB 11667B Power Splitterb Frequency Range 50 MHz to 44 GHz Tracking between ports 0 4 dB 11667C Synthesized Sweeper Frequency Range 50 MHz to 26 5 GHz maximum frequency of the EXA PSG a F...

Страница 511: ... a power meter reading of 60 dBm 0 1 dB 8 On the signal analyzer press Single 9 Press the Peak Search key on the signal analyzer to position the marker on the peak of the signal 10 Refer to Table 17 8 Frequency Response Flatness Results Enter the amplitude of the signal displayed on the signal analyzer into the MeasAmp column of Table 17 8 11 Enter the power meter reading into the PowerMeter colum...

Страница 512: ...unctional Tests Frequency Response Flatness Preamp On 17 Compute the flatness error normalized to 50 MHz MeasError MeasError 50 MHz 18 Enter the computed flatness error value into the FlatNorm column of Table 17 8 19 Compare the value of FlatNorm to the test limit ...

Страница 513: ...rement Powermeter Meas Error Measerror Flatness Normalized to 50 MHz FlatNorm Flatness Error Test Limits dB 50 MHz 0 Ref 1 GHz 2 0 dB 2 GHz 2 0 dB 3 GHz 2 0 dB 3 5 GHz 2 0 dB 4 GHz 3 0 dB 6 GHz 3 0 dB 8 GHz 3 0 dB 9 GHz 3 5 dB 11 GHz 3 5 dB 13 GHz 3 5 dB 14 GHz 4 0 dB 17 GHz 4 0 dB 20 GHz 4 0 dB 23 GHz 4 0 dB 26 GHz 4 0 dB 29 GHz 4 0 dB 32 GHz 4 0 dB 35 GHz 5 0 dB 38 GHz 5 0 dB 41 GHz 5 0 dB 42 5 ...

Страница 514: ...nce amplitude The Marker Delta function is activated and the RF input is reduced using the external precision step attenuator Signal input levels from 0 dBm to 50 dBm are measured Item Critical Specifications for this test Recommended Keysight Model Adapter Type N m to 3 5 mm f a Frequency 50 MHz VSWR 1 1 1 1250 1745 Adapter 3 5 mm f to 3 5 mm f a Frequency 50 MHz VSWR 1 1 1 83059B Adapter 2 4 mm ...

Страница 515: ...hesized sweeper by pressing Frequency 50 MHz Amplitude 5 dBm RF On Off On 4 Set up the signal analyzer by pressing Input Output Freq Ref Input Freq Ref Input External FREQ Center Frequency 50 MHz Span 1 MHz AMPTD Y Scale Ref Level 0 dBm Meas Setup Avg Hold Number 10 Enter Trace Trace Average Peak Search 5 Set the external 10 dB step attenuator to 0 dB 6 Adjust the amplitude on the signal source un...

Страница 516: ...he following steps for each attenuator setting listed in the table below a Select the next External attenuator setting b Press the Restart key to trigger a 10 sweep average c Enter the delta marker value into Table 17 10 d Check delta marker reading against the test limits Table 17 10 Scale Fidelity Results External Attenuator Setting Minimum dB Marker Delta Value dB Maximum dB 0 N A Reference N A...

Страница 517: ...Analyzers Service Guide 18 Instrument Software What You Will Find in This Chapter Instrument Software Overview on page 518 Software Licensing on page 519 Software Updates on page 520 Instrument Measurement Application Software on page 520 ...

Страница 518: ...on you will also see the revision of each However the complete package itself also has a revision associated with it which can also be found on this screen as the Instrument S W Revision Since the instrument application software is distributed in one complete package when an update is installed they are all updated at the same time One of the benefits of this is that you cannot have revisions that...

Страница 519: ... Analyzers Service Guide 519 Instrument Software Software Licensing Software Licensing All application software needs to have a valid license in order to be available for use This also includes the spectrum analyzer application N9060C ...

Страница 520: ... other types of commercial software packages The latest revision of the software along with complete installation instructions can be obtained as follows Web Download The latest revision of the software can be downloaded from http www keysight com find N8973B_software http www keysight com find N8974B_software http www keysight com find N8975B_software http www keysight com find N8976B_software ...

Страница 521: ...shooting 253 A3 digital IF assembly description 260 part number 353 removal 440 troubleshooting 263 A4 CPU assembly description 292 part number 353 removal 433 troubleshooting 292 A4A1 CPU memory card removal 435 A4A1 memory card removal 437 A4BT1 CPU board battery part number 353 post repair setup 473 replacement 433 A5 disk drive description 296 troubleshooting 296 A5 hard disk drive part number...

Страница 522: ...3 removal 457 front frame parts 460 461 front panel interface see A1A2 front panel interface board 353 functional testing performance verification 487 functional tests 46 before performing 488 equipment list 489 introduction 487 vs performance verification tests 487 warm up time 488 See also individual functional tests 487 Functional Tests Guide on CD ROM 15 G Getting Started Guide on CD ROM 15 gr...

Страница 523: ... instrument for service 42 RF area components 399 409 RF Flatness menu description 344 RF input connector part number 353 removal 455 RF limiters 16 RF path block diagram 322 RF section description 134 200 RPG knob part number 353 S Safety Information 390 Sales and Service offices 38 second harmonic distortion test 498 separate analog IF assembly and digital IF assembly 442 serial number 41 servic...

Страница 524: ...This information is subject to change without notice Keysight Technologies 2017 Edition 1 August 2017 N8973 90008 www keysight com ...

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