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HP 8562E, Service Manual

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RF (A15) assembly replacement, 4-38
RF assembly troubleshooting, 12-16
RF block diagram, 11-49
RF check, 7-15

RF gain 

 8-13

RF parts, 5-18
RF path fault isolation, 7-16
RF section, 7-43
RF section parts, 5-27

rosenfell detector troubleshooting, 8-21
R P G

problems, 8-7
removal and replacement, 4-14

RYTHM, 7-44

removal and replacement, 4-34

RYTHM adjustment, 2-60

safety considerations, general, v
safety notes, iv
sales and service offices, 1-16
sales offices, 1-16

sampler, 1 l-45
sampler IF, 11-27, 11-45
sampler troubleshooting, 1   11
sampling loop. See offset lock loop

sampling oscillator, 11-20, 11-23
sampling oscillator adjustment, 2-34
scale fidelity performance test failures, 9-12
scan ramps, 11-42
screen. See display

second converter, 7-44, 12-9

removal and replacement, 4-36

second IF amplifier, 7-44
sensor utilities menu, 3-9

sensor utilities menu softkeys, 3-12
Sensor Utils 

 3-12

serial number, 3-8
serial numbers, l-l
service functions, 7-7
service kit, l-4
service kit contents, l-4

service menu, 7-7
service offices, 1-16
service tools, l-4
setups

software adjustment, 3-4

shipping

shipping container, l-6-8

Single Test 

 3-13

SLODA, 7-43, 11-23

adjustment, 2-40
removal and replacement, 4-30

span

2.02 

MHz to 20 MHz, 11-38

 

MHz, 11-38

 

MHz, 11-39

span accuracy problems, 11-36
span problems, 11-37, 11-40

multiband sweeps, 11-41

speaker troubleshooting, 9-38
state storage problems, 
step gains troubleshooting, 9-31
Store Conds 

 3-12

sweep generator, 1 l-46
sweep generator troubleshooting, 9-38
sweeping, 7-46

span accuracy, 11-36
YTO, 11-24

sweep ramp, 11-42
switching LO distribution amplifier, 11-23

adjustment, 2-40

synthesizer section, 7-46, 11-8

simplified block diagram, 1 l-47
troubleshooting, 1 l-8

System File 

 3-12

T

TAM, 7-10

automatic fault isolation, 11-4
controller troubleshooting, 
power supply, 13-5
power supply connectors, 13-5

printing, 7-12
RF section connectors, 11-5
synthesizer section, 11-2-7
troubleshooting A4 section, 9-4
troubleshooting A5 section, 9-4

troubleshooting the cal oscillator assembly,

9-8

troubleshooting the IF section, 9-3

TAM adjustments, 2-9-11

adjustment indicators, 2-9
corresponding manual adjustments, 2-10
test equipment information, 2-9

test equipment list, 2-l 1

TCXO adjustment, 2-51
test and adjustment module, 2-9. See also TAM

controller, 

test and adjustment module, HP 

 l-3

test descriptions, 3-14-15
test equipment, l-9

frequency response adjustment software, 3-3

test equipment list for TAM adjustments, 2-11
test menu

frequency response adjustment software, 3-8

test points, 7-2
test record header, 3-6
third converter, 7-45
third LO driver amplifier, 11-19

Index-7

Summary of Contents for 8562E

Page 1: ...anual We ve added this manual to the Agilent website in an effort to help you support your product This manual provides the best information we could find It may be incomplete or contain dated information and the scan quality may not be ideal If we find a better copy in the future we will add it to the Agilent website Support for Your Product Agilent no longer sells or supports this product You wi...

Page 2: ...Service Guide HP 8562E Spectrum Analyzer Fia HEWLETT PACKARD HP Part No 08582 90218 Supersedes 08582 90209 Printed in USA December 1997 ...

Page 3: ...ss for a particular purpose Hewlett Packard shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this material Copyright Hewlett Packard Company 1996 All Rights Reserved Reproduction adaptation or translation without prior written permission is prohibited except as allowed under the copyright laws 1400 Fo...

Page 4: ...y shipping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to Hewlett Packard from another country Hewlett Packard warrants that its software and firmware designated by Hewlett Packard for use with an instrument will execute its programming instructions when properly installed on that instrument Hewlett Packard does not war...

Page 5: ...procedure that if not correctly performed or adhered to could result in damage to or destruction of the instrument Do not proceed beyond a caution sign until the indicated conditions are fully understood and met Warning Warning denotes a hazard It calls attention to a procedure which if not correctly performed or adhered to could result in injury or loss of life Do not proceed beyond a warning not...

Page 6: ...ruption of the protective conductor inside or outside the instrument is likely to make the instrument dangerous Intentional interruption is prohibited Warning No operator serviceable parts inside Refer servicing to qualified personnel To prevent electrical shock do not remove covers Caution Before switching on this instrument make sure that the line voltage selector switch is set to the voltage of...

Page 7: ...een Text This indicates text displayed on the spectrum analyzer screen Documentation Outline HP 8560 E Series Spectrum Analyzer Calibration Guide n Tells you how to run verification software n Tells you the specifications of your spectrum analyzer n Tells you how to test your spectrum analyzer HP 8560 E Series Spectrum Analyzer User s Guide n Tells you how to make measurements with your spectrum a...

Page 8: ...M Test Equipment Adjustment Indicator Front End Cal adjustment 1 High Voltage Power Supply Adjustment 2 Display Adjustment 3 IF Bandpass Adjustment 4 IF Amplitude Adjustments 5 DC Log Amplifier Adjustments 6 Sampling Oscillator Adjustment 7 YTO Adjustment 8 LO Distribution Amplifier Adjustment 9 Frequency Response Adjustment 10 Calibrator Amplitude Adjustment 11 10 MHz Reference Adjustment OCXO No...

Page 9: ...Analyzer Serial Number Exiting Frequency Response Adjustment Dual Bus Operation Sensor Utilities Menu Adding a Power Sensor Data File Viewing and Editing a Power Sensor Data File Deleting a File Changing the System Mass Storage File Location Listing Available Power Sensor Data Files Returning to the Conditions Menu Adjust Menu Single Test Calibrate Power Sensor List Equipment Frequency Response Ad...

Page 10: ...MHz 8481A Sensor cal data maximum frequency not 300 MHz 8485A Sensor cal data minimum frequency not 10 MHz 8485A Sensor cal data maximum frequency not 26 5 GHz Error Messages Beginning with Variables filename file not found keyboard entry is a non numeric entry number of instruments instruments have HP IB addresses of HP IB address power meter model number doesn t read signal to be in 1 5 dBm rang...

Page 11: ...able Locations Introduction 6 l 7 General Troubleshooting Introduction 7 l Assembly Level Text 7 l Block Diagrams 7 l Assembly Test Points 7 2 Pad 7 2 Test Jack 7 2 Ribbon Cables 7 2 Service Cal Data Softkey Menus 7 6 Troubleshooting to a Functional Section 7 8 TAM Test and Adjustment Module 7 10 Loading and Running the HP 8562E TAM Interface Software TAM I F SW 7 10 Loading the software 7 10 HP I...

Page 12: ...d Checksum Errors 700 to 799 EEROM Checksum Errors 700 to 704 Program ROM Checksum Errors 705 to 710 RAM Check Errors 711 to 716 Microprocessor Error 717 Battery Problem 718 Model Number Error 719 System Errors 750 to 759 Fast ADC Error 760 Option Module Errors 800 to 899 User Generated Errors 900 to 999 Block Diagram Description RF Section A7 SLODA A8 Low Band Mixer A9 Input Attenuator A10 YIG Tu...

Page 13: ...nterface Triggering or Video Gating Problems Preselector Peaking Control Real Time DAC Flatness Control RF Gain DACs A3 Assembly Video Circuits Log Offset Log Expand Video MUX Video Filter Video Filter Buffer Amplifier Positive Negative Peak Detectors Peak Detector Reset Rosenfell Detector ADC MUX Variable Gain Amplifier VGA Track and Hold A3 Assembly ADC Circuits ADC Control Signals ADC Start Sto...

Page 14: ...ce Tests Log Amplifier P O A4 Assembly Log Amplifier Linear Amplifiers Video Offset Video Output Frequency Counter Prescaler Conditioner AM FM Demodulator 4 8 kHz IF Filters 10 7 MHz IF Filters 4 8 kHz and 10 7 MHz IF Filters 10 6952 MHz VCXO Input Switch LO Switch Synchronous Detector Limiter Isolation Amplifier Detector Mixer Log Offset Gain Compensation Log Offset Compensation Log Gain Compensa...

Page 15: ...ubleshooting Using the TAM Troubleshooting Test Setup Confirming a Faulty Synthesizer Section General PLL Troubleshooting PLL Locked at Wrong Frequency Unlocked PLL Unlocked Reference PLL Operation Troubleshooting Third LO Driver Amplifier Unlocked Offset Lock Loop Sampling Oscillator Operation Troubleshooting Check path to phase frequency detector steps 14 19 Unlocked YTO PLL Operation Troublesho...

Page 16: ... Drive Control Latch for Band Switch Driver YTF Driver Circuit Al5 RF Assembly Confirming a Faulty Third Converter Confirming Third Converter Output Third Converter Flatness Compensation Control Control Latches SIG ID Oscillator Option 008 10 MHz Reference 13 Display Power Supply Section Troubleshooting Using the TAM Blank Display Using the TAM Blank Display Blanking Signal Display Distortion Focu...

Page 17: ... 15 Buck Regulator Control Loop 13 15 High Voltage Supplies 13 15 CRT Supply Dropping Out 13 16 Buck Regulator Control 13 17 DC DC Converter Control 13 17 Power Up 13 18 A Component Level Information Packets Index Contents 10 ...

Page 18: ...ment Location 2 20 10 MHz Reference Adjustment Setup TCXO 2 21 Demodulator Adjustment Setup 2 22 Demodulator Adjustment Locations 2 23 External Mixer Bias Adjustment Setup 2 24 External Mixer Amplitude Adjustment Setup 2 25 RYTHM Adjustment Setup 2 26 16 MHz PLL Adjustment Setup 2 27 16 MHz PLL Adjustment Location 3 l Front End Cal Adjustment Setup 4 1 Hinged Assemblies 4 2 Discharging High Voltag...

Page 19: ...tification Front Frame Parts Identification Rear Frame Hinged Assemblies Top View A2 Unfolded Top View A2 and A3 Unfolded Top View A2 A3 A4 and A5 Unfolded Bottom View Al5 Unfolded Bottom View Al5 and Al4 Unfolded Al6 Fast ADC Option 007 HP 85623 Front End Rear View Assembly Test Points Ribbon Cable Connections 1 of 2 Service Cal Data Menu Functional Sections Phase Lock Loops Simplified Block Diag...

Page 20: ... Test Setup 11 5 PLL Locked at Wrong Frequency 11 6 Unlocked PLL 11 7 Troubleshooting an Unlocked YTO PLL 11 8 VCO Bias Voltages 11 9 HP 85623 Sweep and Scan Ramps 11 10 Simplified Synthesizer Section 1 l 11 Simplified Al4 Assembly Block Diagram 11 12 Simplified Al5 Assembly Block Diagram 11 13 Frequency Control Block Diagram 11 14 RF Assembly Block Diagram 12 1 Al4 and Al5 Test Connectors 12 2 A1...

Page 21: ...A l HP 85623 Interconnect Block Diagram A 5 Contents 14 ...

Page 22: ...5 l Reference Designations Abbreviations and Multipliers 5 3 5 2 Manufacturers Code List 5 6 5 3 Replaceable Parts 5 7 7 l Location of Assembly Troubleshooting Text 7 9 8 l W2 Control Cable Connections 8 2 8 2 Automatic Fault Isolation References 8 5 8 3 TAM Tests versus A3 Test Connectors 8 6 8 4 Keyboard Matrix 8 7 8 5 Counter Frequencies 8 9 8 6 Trigger MUX Truth Table 8 9 8 7 A3U102 Latch Outp...

Page 23: ... versus Span 11 14 Harmonic Mixing Number versus Center Frequency 11 15 Settings of Sweep Switches 11 16 Settings for Switches and Comparators 12 1 Automatic Fault Isolation References 12 2 TAM Tests versus Test Connectors 12 3 HP 85623 Attenuator Control Truth Table 12 4 Sweep Tune Multiplier Values 12 5 RF Section Mnemonic Table 13 1 Wl Power Cable Connections 13 2 Automatic Fault Isolation Refe...

Page 24: ...e prefix two letters and the first four numbers and the suffix the last four numbers Serial Number Label Example The two letters identify the country in which the unit was manufactured The four numbers of the prefix are a code identifying the date of the last major design change incorporated in your Hewlett Packard product The four digit suffix is a sequential number and coupled with the prefix pr...

Page 25: ...hem Sweep Output HP 85623 Option 007 Fast ADC Table l 1 Instrument Variations Added W19 Cable Assembly Rear Panel J 10 W58 Cable Assembly Deleted HP 85623 Option 008 SIG ID HP 85623 Option 103 Delete OCXO HP 85623 Option 104 and Video Output Al6 Fast ADC Assembly A3 Interface Assembly Opt 007 W20 Cable Assembly Opt 007 W59 Cable Assembly Al5 RF Assembly Opt 008 Al5 RF Assembly Opt 103 A3 Interface...

Page 26: ...face software this software is supplied with Option 915 add Service Documentation The TAM measures voltages at key points in the circuitry and flags a failure whenever the voltage falls outside the limits The TAM locates the failure to a small functional area which can then be examined manually See chapter 7 General Troubleshooting for a complete description of how to use the TAM and its interface...

Page 27: ... 1 1 1 1 1 2 HP Part Number 5021 6773 5021 7459 5061 9032 5062 0728 5062 0737 85680 60093 8710 1791 Electrostatic Discharge Electrostatic discharge ESD can damage or destroy electronic components Therefore all work performed on assemblies consisting of electronic components should be done at a static free workstation Figure l l is an example of a static safe workstation using two kinds of ESD prot...

Page 28: ...ng n Before connecting any coaxial cable to an spectrum analyzer connector for the first time each day momentarily ground the center and outer connectors of the cable H Personnel should be grounded with a resistor isolated wrist strap before touching the center pin of any connector and before removing any assembly from the unit n Be sure all instruments are properly earth grounded to prevent build...

Page 29: ...for servicing fill in and attach a blue service tag Service tags are supplied in the back of this chapter Please be as specific as possible about the nature of the problem If you have recorded any error messages that appeared on the screen or have completed a performance test record or have any other specific data on the performance of the spectrum analyzer please send a copy of this information w...

Page 30: ...at is double walled corrugated cardboard carton with 159 kg 350 lb bursting strength The carton must be both large enough and strong enough to accommodate the spectrum analyzer and allow at least 3 to 4 inches on all sides of the spectrum analyzer for packing material 5 Surround the equipment with at least 3 to 4 inches of packing material or enough to prevent the equipment from moving in the cart...

Page 31: ...Item 1 r 2 3 Description I HP Part Number 9211 6969 Outer Carton 9220 5073 Pads 2 9220 5072 Top Tray Figure 1 2 Spectrum Analyzer Shipping Container and Cushioning Materials 1 6 General Information ...

Page 32: ... performance tests adjustments troubleshooting and the Test and Adjustment Module Any equipment that meets the critical specifications given in the table can be substituted for the recommended model s Operation verification and the performance tests are located in the Calibration Guide General Information l 9 ...

Page 33: ...z at 10 kHz offset 124 dBc Hz at 100 kHz offset Frequency range 10 kHz to 50 MHz Pulse width 200 ns 3utput amplitude 5 V peak to peak Functions pulse triangle Pulse rise time lOO ns I TL sync output Frequency range 1 MHz to 200 MHz Frequency modulation mode Modulation oscillator frequency 1 kHz FM peak deviation 5 kHz Instrument sources jynthesized sweeper two required ynthesizer level generator i...

Page 34: ... MHz reference input Receivers spectrum analyzer Frequency range 300 kHz to 7 GHz Amplitude range 70 dBm to 20 dBm HP 8566B A T VIeasuring receiver Compatible w power sensors dB relative mode Resolution 0 01 dB Reference accuracy fl 2 HP 8902A PAT WV iensors ower sensor Frequency range 10 MHz to 13 2 GHz Maximum SWR 1 40 10 to 30 MHz 1 18 30 to 50 MHz 1 10 50 MHz to 2 GHz 1 18 2 to 13 2 GHz HP 848...

Page 35: ... HP 54501A PAT Lmplifier Frequency range 2 0 to 8 0 GHz Minimum output power leveled 2 0 to 8 0 GHz 16 dBm Output SWR leveled 1 7 HP 11975A P ower supply Output voltage 224 Vdc Output voltage accuracy f0 2 V HP 6114A A ignature multimeter Clock frequency lO MHz Time interval function HP 5005A B T igital voltmeter Range 15 Vdc to 120 Vdc Accuracy fl mV on 10 V range Input impedance 21 M D HP 3456A ...

Page 36: ...nal Directivity 14 dB minimum Flatness 0 75 dB maximum VSWR 1 45 fnsertion loss 1 3 dB Attenuation range 30 dB Frequency range dc to 80 MHz Connectors BNC f Attenuation range 12 dB Frequency range dc to 80 MHz Connectors BNC f Frequency range dc to 13 2 GHz Attenuation accuracy fl dB Maximum SWR 1 2 dc to 2 9 GHz Frequency range dc to 13 2 GHz Attenuation accuracy f0 6 dB Maximum SWR 1 2 dc to 2 9...

Page 37: ... 1010 A 85680 60093 able RG 214 U HP 11500A able 8126 1578 able 50 Sl coaxial jive required Connectors BNC m to SMB f Length 261 cm 24 in Connectors Type N m Length 291 cm 36 in Connectors SMA m Length 24 to 36 inches onnectors BNC m Length 2 122 cm 48 in HP 10503A able rrequency range 30 Hz to 26 5 GHz tiaximum SWR 1 4 at 26 5 GHz vlaximum insertion loss 3 dB Yonuectors APC 3 5 m both ends ength ...

Page 38: ...pe N m to APC 3 5 f Type N m to BNC m Type N m to N f Type N f to APC 3 5 f Type N m to SMA f Type N f to SMA f BNC f to BNC f BNC tee f m f BNC f to SMA m BNC f to dual banana plug APC 3 5 f to APC 3 5 f APC 3 5 m to APC 3 5 m 2 4 mm f to 2 4 mm f APC 3 5 f to 2 4 mm f APC 3 5 m to 2 4 mm f Type N f to 2 4 mm f Type N f to 2 4 mm m Recommendec Model HP 10833B Use PAM 1250 1477 P A 1250 1476 P A V...

Page 39: ... Hewlett Packard Sales and Service Office listed in Table l 5 In any correspondence be sure to include the pertinent information about model numbers serial numbers and assembly part numbers Note Within the USA a toll free phone number is available for ordering replacement parts Refer to the section entitled Ordering Information in Chapter 5 Replaceable Parts for the phone number and more informati...

Page 40: ...Canada Hewlett Packard Strasse 1217 Meyrin 2 Geneva Zone D Activite De Courtaboeuf 61352 Bad Homburg v d H Switzerland F 91947 Les UIis Cedex Germany 41 22 780 8111 France 49 6172 16 O 33 1 69 82 60 60 Great Britain Hewlett Packard Ltd EskdaIe Road Winnersh Triangle Wokingham Berkshire RG41 5DZ England 44 734 696622 INTERCON FIELD OPERATIONS Headquarters Hewlett Packard Company 3495 Deer Creek Roa...

Page 41: ...ply Adjustment 2 Display Adjustment 3 IF Bandpass Adjustment 4 IF Amplitude Adjustments 5 DC Log Amplifier Adjustments 6 Sampling Oscillator Adjustment 7 YTO Adjustment 8 LO Distribution Amplifier Adjustment 9 Frequency Response Adjustment 10 Calibrator Amplitude Adjustment 11 10 MHz Reference Adjustment OCXO 12 10 MHz Reference Adjustment TCXO Option 103 13 Demodulator Adjustment 14 External Mixe...

Page 42: ...d even if the instrument has been disconnected from its source of supply n Use a nonmetallic adjustment tool whenever possible Which Adjustments Should Be Performed Table 2 l lists the manual adjustments that should be performed when an assembly is repaired or changed It is important to perform the adjustments in the order indicated to ensure that the instrument meets its specifications Test Equip...

Page 43: ...umber 8710 1010 If the tuning slug requires a forked tuning tool use HP part number 8710 0772 Never try to force an adjustment control This is especially critical when tuning variable capacitors or slug tuned inductors Required service accessories with part numbers are listed under Service Kit in Chapter 1 General Information Instrument Service Position Refer to Chapter 4 Assembly Replacement for ...

Page 44: ...de adjustment YIG tuned filter mixer adjustment Frequency response adjustment Display adjustment fast zero span Frequency response adjustment Display adjustment Fast Zero Span Demodulator adjustment 1F amplitude adjustment DC log amplifier adjustment 1F bandpass adjustment F amplitude adjustment High voltage power supply adjustment Display adjustment High voltage power supply adjustment Display ad...

Page 45: ...e performance test fails YIG tuned filter mixer RYTHM adjustment Frequency response adjustment YTO adjustment Frequency response adjustment Display adjustment fast zero span YTO adjustment LO distribution amplifier adjustment Frequency response adjustment 10 MHz reference adjustment TCXO Option 103 600 MHz reference adjustment Calibrator amplitude adjustment External mixer bias adjustment Sampling...

Page 46: ... display Adjusts the blanking at the start of a vector on the display Adjusts the vertical gain in fast analog zero span to match with the digital zero span input Adjusts the end of the trace to the rightmost vertical graticule line in fast analog zero span mode Adjusts the FM demodulation for a peak response Adjusts Limiter Phase for peak response Minimizes error to Top of Screen Minimizes Linear...

Page 47: ...acy by affecting the sensitivity of the FM coil driver Adjusts the main coil fixed driver current at a YTO frequency of 3 2 GHz near the lower YTO frequency limit Transforms the sampler input impedance to 50 ohms over the 285 to 297 2 MHz range Adjusts the VCO tank capacitance so that 21V on the VCO tune line equals 298 MHz VCO frequency Adjusts for maximum 600 MHz reference output Adjusts for max...

Page 48: ...stal Selected to optimize center frequency of LC tank that loads the crystal Selected to optimize LC pole center frequency Selected to optimize LC pole center frequency Selected to optimize center frequency of LC tank that loads the crystal Selected to optimize center frequency of LC tank that loads the crystal Selected to optimize LC pole center frequency Selected to optimize LC pole center frequ...

Page 49: ...ted Recommended substitutes are listed in the configuration menu If you must substitute the source with a user defined model the adjustments run faster using a synthesized source rather than an unsynthesized source Note When connecting signals from the HP 8340A B or any microwave source to the adjustment setup use a high frequency test cable with minimum attenuation to 26 5 GHz HP part number 8120...

Page 50: ...adjustments A4 limiter phase 5 DC log amplifier adjustments A4 linear fidelity 5 DC log amplifier adjustments A4 log fidelity 5 Sampling oscillator adjustment 6 YTO adjustment 7 First LO distribution amplifier adjustment 8 Frequency response adjustment 9 Frequency response adjustment 9 YIG tuned filter mixer adjustment 16 Calibrator amplitude adjustment 10 10 MHz reference adjustment TCXO 12 Optio...

Page 51: ...436A HP 438A Power sensor 300 MHz HP 8482A HP 8481A 13 10 MHz reference Frequency counter HP 5342A HP 5343A Oscillator 9 to 11 MHz 14 External mixer bias Manual probe cable 5001 8743 15 External mixer amplitude Power meter HP 8902A HP 436A HP 438A Power sensor HP 8481D HP 8484A 310 7 MHz 25 to 35 dBm Source 310 7 MHz 30 dBm HP 8340A B Adjustment Procedures 2 l 1 ...

Page 52: ...This procedure automates two manual procedures Frequency Response Adjustment and YIG Tuned Filter Mixer RYTHM Adjustment This procedure is described in Chapter 3 Frequency Response Adjustment Software 2 12 Adjustment Procedures ...

Page 53: ...arning n To minimize shock hazard use a nonmetallic adjustment tool when adjusting the A6 power supply n The following procedure probes voltages that if contacted could cause personal injury or death Note w Adjustment of the high voltage power supply should not be a routine maintenance procedure Any adjustments should be done only if the A6 power supply A6Al HV module or A18Vl CRT display is repai...

Page 54: ...cover 2 Position the spectrum analyzer as shown in Figure 2 l Connect the positive DVM lead to A6TP405 and the negative DVM lead to A6TP401 3 Set the HP 3456A controls as follows Function DCVOLTS Range 1OOOVOLTS 4 Reconnect the power cord to the spectrum analyzer and press m to the on position 5 Record the voltage marked on the A6Al HV module Voltage marked on A6Al HV Module Vdc 6 Adjust A6R410 HV...

Page 55: ...sing the CRT adjust pattern Fine adjustments use the graticule The fast zero span amplitude adjustments correct for differences between analog and digital display modes The displayed sweep time accuracy is adjusted in the fast zero span sweep adjustments SPECTRUM ANALYZER Figure 2 2 Display Adjustment Setup Equipment 10 dB VHF step attenuator HP 355D Adapters Type N m to BNC f 1250 1476 Cables BNC...

Page 56: ...t 6 Press PRESET DISPLAY IImNSITY 255 ENTER STORE IIfTEMSITY MORE 1 of 2 FOCUS 127 ENTER STORE FOCTJS then GRAT OM OFF OFF Adjust A17Rll CUTOFF until the retrace line between the bottom of trace A and the annunciators at the bottom of the display just disappears Deflection Adjustments 7 Press GRAT ON OFF ON MORE 2 of 2 INTENSITY 80 ENTER STORE INmSITY ICAL MO F I of 2 and CRT ADJ PATTERN Fold up t...

Page 57: ...tersection of the graticule lines This will be most noticeable along the center vertical and horizontal graticule lines DEFLECTION ADJUSTMENTS A d j u s t S T A R T B L A N K a n d S T O P B L A N K f o r s h a r p c o r n e r s A d j u s t D G T L Y G A I N u n t i l o n l y o n e l i n e a p p e a r s A d j u s t D G T L X G A I N u n t i l o n l y o n e l i n e a p p e a r s SOFTKEY 1 SOFTKEY 2...

Page 58: ...15 NITS on a photometer radiometer 17 Press CAL MORE I of 2 and CRT ADJ PATTERN Locate the dot just below the HP logo Adjust A17R93 ASTIG for the smallest round dot possible 18 Adjust A17R34 COARSE FOCUS and A17R92 DDD for the best focus of the characters at the center of the screen 19 Adjust A17R21 Z FOCUS for the best focus of the test pattern outside box 20 Adjust A17R26 X FOCUS for best focus ...

Page 59: ...FSET and A2R268 SWEEP GAIN to midrange Adjustment locations are shown in Figure 2 4 for these A2 adjustments 23 Set the HP 355D to 30 dB attenuation 24 Press PRESET on the spectrum analyzer and connect the equipment as shown in Figure 2 2 Set the spectrum analyzer controls as follows Centerfrequency 300MHz Span OHz Reference level 40 dBm Resolution bandwidth 1 kHz Videobandwidth 300Hz Sweep time 5...

Page 60: ...he sweep time to 50 ms Press ISAVE SAVE STATE and STATE 3 34 Press RECALL RECALL STATE and STATE 1 35 Switch between STATE 1 and STATE 2 Adjust A2R268 and A2R218 so that the trace in state 1 is lined up with the top line of the graticule and the state 2 trace is lined up with the eighth graticule down from the top counting the top line Repeat until the traces align to within f0 2 divisions 36 Adju...

Page 61: ... such that the varactor diodes are biased near the middle of their capacitance range The varactor diode bias is measured with the DVM Note This procedure is not a routine adjustment It should be performed only if repairs to the A5 IF assembly are made If the entire A5 IF assembly is replaced the assembly arrives pre adjusted from the factory and requires no further adjustment SPECTRUM ANALYZER 5 i...

Page 62: ...est point If the voltage is less than t6 06 Vdc turn A5L300 LC CTR 1 clockwise If the voltage is greater than 6 26 Vdc turn LC CTR 1 counterclockwise 6 Repeat steps 4 and 5 until the voltage reads i 6 16 Vdc flO0 mV Note If the range for the LC CTR adjustment is insufficient replace the appropriate factory selected capacitor as listed in Table 2 6 To determine the correct replacement value center ...

Page 63: ... 10 12 15 18 5 5 to 6 5 No change No change No change No change No change No change No change 6 5 to 7 5 No change No change No change No change No change No change No change 7 5 to 8 5 6 8 8 2 10 12 15 18 8 5 to 9 5 6 8 8 2 12 15 18 9 5 to 10 6 8 8 2 10 12 15 Indicates a condition that should not exist suspect broken hardware XTAL Bandpass Adjustments 13 On the spectrum analyzer press ISPAN 1 MHz...

Page 64: ... XTAL CTR 3 using the procedure in steps 15 through 17 22 Move the positive DVM test lead to A5TP4 23 Adjust A5T502 XTAL CTR 4 using the procedure in steps 15 through 17 Table 2 8 Factory Selected XTAL Filter Capacitors XTAL CTR Adjustment Fixed Factory Select Capacitor A5T200 XTAL CTR 1 A5C204 A5T202 XTAL CTR 2 A5C216 A5T500 XTAL CTR 3 A5C505 A5T502 XTAL CTR 4 A5C516 Table 2 9 XTAL Factory Select...

Page 65: ...ment Table 2 10 Capacitor Part Numbers I Capacito pF 8 2 10 12 1518 20 22 24 27 HP Part Number 0160 4793 0160 4792 0160 4791 0160 4790 0160 4789 0160 4788 0160 5699 0160 4787 0160 5903 0160 4786 Adjustment Procedures 2 25 ...

Page 66: ...signal applied to the 10 7 MHz IF input on the A5 IF assembly A5J3 causes a displayed signal of 60 dBm The effect of this adjustment is visible only after the ADJ CURR IF STATE sequence is complete ADJ CURR IF STATE causes the IF gain adjustment to use the new output amplitude from the A4 log amp Cal oscillator This procedure also sets the attenuator of the reference 15 dB attenuator so that a sou...

Page 67: ...plitude Adjustment Locations Note The 15 dB reference attenuator adjustment is preset at the factory and need not be done if the entire A5 IF assembly is replaced Procedure 1 Press luNE to turn the spectrum analyzer off Remove the spectrum analyzer cover and place the spectrum analyzer in the service position as illustrated in Figure 2 7 2 Disconnect W29 violet coax cable from A5J3 Connect the tes...

Page 68: ...f A4R826 has inadequate range refer to Inadequate CAL OSC AMPTD Range in Chapter 9 IF Section 8 Press ADJ CURE IF STATE After allowing the analyzer time to complete the adjustments the displayed amplitude and marker reading should change 9 Repeat steps 7 and 8 until the marker reads 60 dBm fO l dB 10 Disconnect the test cable from A5J3 and reconnect W29 to A5J3 A5 Reference Attenuator Adjustment 1...

Page 69: ...lyzer disconnect W29 from A5J3 Connect the test cable between A5J3 and the 50 R output of the HP 3335A 23 Set the spectrum analyzer reference level to 10 dBm 24 Set the HP 3335A m to 5 dBm 25 Press MKR and l4ARKER NORMAL on the spectrum analyzer 26 The MARKER amplitude should read 10 dBm f0 13 dB If the reading is outside of this range repeat steps 4 through 21 27 On the spectrum analyzer reconnec...

Page 70: ...ter phase Only if a repair is made to blocks F G H I or J Linear fidelity Only if a repair is made to blocks C D F G H I J K 0 IF gain accuracy RBW switching or log fidelity Log fidelity Only if a repair is made to blocks D F H K IF gain accuracy RBW switching or log fidelity If multiple adjustments are required they should be done in the following order 1 Limiter phase 2 Linear fidelity 3 Log fid...

Page 71: ...0 DC Log Adjustment Locations Note Adjustments should be made with all of the shields on and only after allowing at least a 20 minute warmup A4 Limiter Phase Adjustment 1 Press LINE to turn the spectrum analyzer off Remove the spectrum analyzer cover and place the spectrum analyzer in the service position as illustrated in Figure 2 9 See Figure 2 10 for adjustment location 2 Connect the HP 3335A 5...

Page 72: ...IuNE to turn the spectrum analyzer on Press 1 m LINEAR MORE I of 3 AMPTD UNITS dBm a IF AD 7 ON OFF OFF Set the spectrum analyzer controls as follows Center frequency 15 MHz Span 5MHz Resolution bandwidth 300 kHz Reference level 10 dBm Set up an HP 3335A as follows Frequency 15 MHz Amplitude 10 dBm Press PEAK SEARCH MAftKER DELTA Reduce the HP 3335A input power to 58 dBm If the delta marker amplit...

Page 73: ... analyzer controls as follows Center frequency 15 MHz Span O Resolution bandwidth 300 kHz Reference level 10 dBm 5 Set up an HP 3335A as follows Frequency 15MHz Amplitude 10 dBm 6 Press MKR MARKER DELTA on the spectrum analyzer 7 Decrease the HP 3335A power to 26 dBm 8 Calculate the error Error delta marker reading 16 dB 9 If the error is less than f0 2 dB no adjustment is necessary 10 Set the HP ...

Page 74: ...other frequencies for the full tuning range of the sampling oscillator DIGITAL VOLTMETER SPECTRUM ANALYZER PC BOARD PROP Figure 2 11 Sampler Adjustment Setup SK17 Equipment Digital voltmeter HP 3456A DVMtestleads HP 34118A Procedure 1 Press to turn the spectrum analyzer off and disconnect the line power cord Remove the spectrum analyzer cover and fold down the Al5 RF and Al4 frequency control asse...

Page 75: ...layed on the DVM 9 Record the displayed voltage in Table 2 11 as the displayed voltage for the sampling oscillator frequency of 291 667 MHz 10 Press 1 on the spectrum analyzer Use the keypad to set the spectrum analyzer center frequency to the frequencies listed in Table 2 11 At each listed frequency record the displayed voltage in the table 11 If the difference between the maximum and minimum vol...

Page 76: ...6 Sampling Oscillator Adjustment Table 2 l 1 Sampling Adjustments 2158 3 293 478 2196 3 295 ooo 2378 3 296 471 2422 3 297 222 2 36 Adjustment Procedures ...

Page 77: ...nts within the capture range of the main loop The YTO FM coil is adjusted to place the 300 MHz CAL OUTPUT signal at the center vertical graticule in a 20 MHz span ADAPTER SMA CABI 500MHz 26 5 GH Al4 FREO CONTROL Al5 RF SPECTRUM ANALYZER Figure 2 13 YTO Adjustment Setup Equipment Microwave frequency counter HP 5343A Option 001 Adapters Type N m to BNC f 1250 1476 Type N f to APC 3 5 f Option 026 on...

Page 78: ...r the location on the Al4 frequency control assemblies On the spectrum analyzer press the following keys m EXT NXR PRE UNPR UNPR m EXTERNAL MIXER LOCK HARMONIC 6 Hz SPAN ZERO SPAN FREQUENCY CENTER FRE 18 8893 GHz mSWP 07 SAVE SAVE STATE STATE 0 EZEkV 35 7493GHz 07 SAVE SAVE STATE STATE 1 RECALL RECALL STATE STATE 0 On the HP 5343A press SHIFT 7 and set the controls as follows Sample rate Fully cou...

Page 79: ...ect the SMA cable from the first LO OUTPUT jack and reconnect the 500 termination on the first LO OUTPUT YTO FM Coil Adjustments 13 On the spectrum analyzer press PRESET and set the controls as follows Centerfrequency 300MHz Span 20 MHz 14 Adjust A14R76 FM SPAN until the 300 MHz CAL OUTPUT SIGNAL is aligned with I center vertical graticule line he Adjustment Procedures 2 39 ...

Page 80: ...bias and SENSE voltages for the A7 switched LO distribution amplifier is adjusted to the value specified on the label of A7 MEASURING RECEIVER MEASURING RECEIVER SPECTRUM SPECTRUM ANALYZER POWER SENSOR R DIGITAL VOLTMETER Figure 2 15 First LO Distribution Amplifier Adjustment Setup Equipment DVM HP 3456A DVMtestleads HP 34118A SK1 10 2 40 Adjustment Procedures ...

Page 81: ...n location drawing PIN 2 PIN 16 PIN 1 n l 0 0 SP114E Figure 2 18 TAM Connector Pin Locations 8 On the HP 85623 press La GA LEVEL 9 Note the Gate Bias voltage printed on the A7 LO distribution amp label Use the knob or keypad to change the displayed DAC value so the DVM reading is equal to the label voltage f10 mV 10 To set the low band sense voltage connect the positive lead of the DVM to A14J18 p...

Page 82: ...requency to 9 46 GHz 19 On the HP 85623 press CAL MDRE I OF 2 SERVICE CAL DATA LO LEVELS and INT LO LEVEL The message DRIVE FOR BAND 2 will be displayed 20 Note the B2 INT Sense voltage printed on the A7 LO distribution amp label Use the knob or keypad and press enter to change the displayed DAC value so the DVM reading is 6 mV more negative than the label voltage For example if the B2 INT Sense v...

Page 83: ...n points at 2 MHz and 6 MHz which are outside the synthesized sweeper frequency range The DAC values for these two points are set to a fixed offset from the DAC value at 10 MHz The DAC values are stored in EEROM Automated Procedure Available The frequency response adjustment requires making several measurements at more than 120 different frequencies over the spectrum analyzer frequency range Ihis ...

Page 84: ...e Adjustment Setup Equipment Synthesized sweeper HP 8340A B Measuring receiver HP 8902A Power sensor I HP 8482A Power sensor HP 8485A Power splitter HP 11667B Adapters Type N m to Type N m 1250 1475 Type N m to APC 3 5 m 1250 1743 Type N f to APC 3 5 m 1250 1750 Type APC 3 5 f to APC 3 5 f 5061 5311 Cables BNC 122cm 48in HP 10503A APC 3 5 91cm 36in 8120 4921 SK112 2 44 Adjustment Procedures ...

Page 85: ...e controls as follows CWfrequency lO MHz Powerlevel 4dBm 6 Set ref level cal DAC to zero Press m REF LVL ADJ and use the knob to set the value to 0 Press STORE REV LVL 7 On the HP 85623 press MKRI CAL MORE i OF 2 SERVICE CAL DATA then FLATNESS The current value of the RF Gain DAC should be displayed in the active function area 8 Enter the appropriate power sensor calibration factor into the HP 890...

Page 86: ...67B power splitter 20 Enter the appropriate power sensor calibration factor into the HP 8902A 21 Set the HP 8340A B Icw output to the frequency indicated in the active function area of the HP 85623 display 22 Adjust the HP 8340A B POWER LEVEL to place the signal midscreen on the HP 85623 display 23 On the HP 85623 press PRESEL AUTO CTR 24 Adjust the HP 8340A B POWER LEVEL for a 10 dBm reading on t...

Page 87: ...N f to BNC m 1250 1477 Procedure S K 1 1 3 Note The spectrum analyzer should be allowed to warm up for at least 30 minutes before performing this adjustment 1 Place the spectrum analyzer in the service position shown in Figure 2 18 Prop the Al4 frequency control board assembly in the service position 2 Zero and calibrate the HP 8902A HP 8482A combination in log display mode Enter the power sensor ...

Page 88: ...ernal 10 MHz frequency reference is compared to a known frequency standard and adjusted for minimum frequency error This procedure does not adjust the short term stability or long term stability of the A21 10 MHz ovenized crystal oscillator OCXO Stability is determined by the characteristics of the particular oscillator and the environmental and warmup conditions to which it has been recently expo...

Page 89: ...1B Cesium Beam Standard or any 10 MHz frequency standard with accuracy fl X 10 l Cable BNC 122 cm 2 required HP 10503A Procedure Note Failure to allow a 24 hour minimum warmup time for OCXO frequency and temperature stabilization may result in oscillator misadjustment 1 Connect equipment as shown in Figure 2 19 as follows a Press LINE to turn the spectrum analyzer on After the automatic power on a...

Page 90: ... frequency of the INPUT A signal and 10 0 MHz with a displayed resolution of 0 010 Hz 10 MHz 5 Locate the FREQ ADJ control on the spectrum analyzer This control is accessible through the center deck of the spectrum analyzer See Figure 2 19 6 7 Remove the dust cap screw Use a nonconductive adjustment tool to adjust the FREQ ADJ control on the A21 OCXO for a frequency counter reading of 0 00 Hz 8 9 ...

Page 91: ...he 10 MHz frequency reference which yields better effective resolution The temperature compensated crystal oscillator TCXO is adjusted for a frequency counter reading of 300 MHz FREQUENCY STANDARD FREQUENCY COUNTER SPllE Figure 2 20 10 MHz Reference Adjustment Setup TCXO Equipment Microwave frequency counter HP 5343A Option 001 Frequency standard HP 5061B Cesium Beam Standard or any 10 MHz frequen...

Page 92: ...MHz 26 5 GHz switch 10 Hz 500 MHz 3 Press mCTRL REllR PANEL Verify that the 10 MHz reference is set to 10 MHz INT Note When the 10 MHz reference is set to 10 MHz EXT the TCXO is not operating and warmed up If the reference is set to 10 MHz ENT set the reference to 10 MHz INT and allow 30 minutes for the TCXO to warm up 4 Remove dust cap from A15U302 TCXO The dust cap is toward the rear of the spec...

Page 93: ...d to the INPUT 500 The detected audio is monitored by an oscilloscope FM DEMOD is adjusted to peak the response displayed on the oscilloscope DIGITIZING OSCILLOSCOPE SIGNAL GENERATOR I OUTPUT ADAPTER ADAPTER B A3 sj150e Figure 2 2 1 Demodulator Adjustment Setup Equipment AM FM signal generator HP 8640B Oscilloscope HP 54501A Adapters Type N m to BNC f 2 required 1250 1476 Type N f to APC 3 5 f Opt...

Page 94: ...dBm RF ON AM OFF FM IN T Modulation frequency 1000 Hz Peak deviation 5kHz ScaleFM k MHz 4 Adjust the HP 8640B FM deviation vernier for a full scale reading on the meter Set the FM to off 5 Set the oscilloscope controls as follows Channel1 on Channel2 off Channel 1 50 mV division Channel1 a c Channel1 BWli m Time base 1 0 ms division Trigger aut o Trigger source Trigger level O O V 6 On the spectru...

Page 95: ...r until the amplitude of the 1 kHz signal is at about 150 mV 3 divisions on the oscilloscope 9 Adjust A4C707 FM DEMOD for a maximum peak to peak response on the oscilloscope 10 Press LINE to turn the spectrum analyzer off Disconnect the test cable from A4C723 CONNECT HERE SP115E Figure 2 22 Demodulator Adjustment Locations Adjustment Procedures 2 55 ...

Page 96: ...56A Adapters Type BNC f to SMA m 1250 1200 Type BNC f to dual banana plug 1251 2816 Cables BNC 122cm 48in HP 10503A Procedure 1 Press luNE to turn the spectrum analyzer off and disconnect the ac power cord Remove the spectrum analyzer cover and connect the equipment as illustrated in Figure 2 23 Fold down the Al5 RF assembly Reconnect the power cord and set the luNE switch to on 2 Set the HP 3456A...

Page 97: ...and are recorded and reset to 30 dB A 310 7 MHz signal is applied to the power sensor and the power level of the source is adjusted for a 30 dBm reading The signal is then applied to the IF INPUT The flatness compensation amplifiers are then adjusted via DACs to place the displayed signal at the reference level sYNTpEEsp Eo FREQUENCY BNC CABLE ANALYZER MEASUR I NG RECEIVER I 11 0 I I EJ CABLE 1 I ...

Page 98: ... edge of the A2 board assembly and can be moved without folding the board down Press LINE to turn the spectrum analyzer on On the spectrum analyzer press c 1 EXT MXR PRE UEFR UNPR mCTRL EXTERNAL MIXER BMPTD CORRECT then CNV LDSS VS FREq Press or a to display the conversion loss value for each frequency listed in Table 2 12 Record any conversion loss reading not equal to 30 dB in Table 2 12 at the ...

Page 99: ...e function block and press EXT MXR REF CAL Disconnect the SMA cable from the power sensor adapter and connect the cable to the spectrum analyzer IF INPUT Use the spectrum analyzer front panel knob step keys or keypad to change the amplitude of the displayed signal until the marker reads 0 dBm f0 17 dB Press PREV MEHJ STORE DATA and y S on the spectrum analyzer Place the WR PROT WR ENA jumper on th...

Page 100: ...ptimized at a low frequency and the slope DAC value is optimized at a high frequency Automated Procedure Available The YIG Tuned Filter Mixer adjustment is included in the automated HP 85623 Front End Cal adjustment which is described in Chapter 3 Frequency Response Adjustment Software BNC CABLE H EX R PROT JUMPE THIS J ADAPTER II OUTPUT Al4 FREP CONTROL Al5 RF WR ENA R IN AREA Sk121 Figure 2 25 R...

Page 101: ...ols as follows CW 4 0 GHz Power level 10 dBm Frequency standard switch rear panel EXT Press PRESEL OFFSET on the HP 85623 Use the front panel knob to peak the displayed trace Record the offset DAC value below Offset at 4 0 GHz Set the HP 85623 center frequency and the HP 8340A a to 12 16 GHz On the HP 85623 press ICAL MORE 1 OF 2 SERVICE GAL DATA PRESEL ADJ then PRESEL OFFSET Key in the offset val...

Page 102: ...stment 14 Press PREV MENU STORE DATA and YES 15 Place the WR PROT WR ENA jumper on the A2 controller assembly in the WR PROT position 16 On the HP 85623 press E MORE I OF 2 FACTORY PRSEL PK m then SAVE PRESEL PK 2 62 Adjustment Procedures ...

Page 103: ...ed for a clock frequency of approximately 14 4 MHz with the loop unlocked This ensures that the CPU will still function and the display annotation will be distorted but readable even if the 10 MHz reference to A2 is absent Note If necessary perform the display adjustments after performing the following adjustment BNC CABLE f PC BOARD PRoP O T w FREQ STD OUT r A3 INTERFACE SPECTRUM ANALYZER A FREQU...

Page 104: ...tment location is shown in Figure 2 27 A2 CONTROLLER ASSEMBLY a Figure 2 27 16 MHz PLL Adjustment Location 4 Press luNE to turn the spectrum analyzer on Wait until the spectrum analyzer power on adjustments have completed 5 Set the microwave frequency counter as follows Sample rate Fully counterclockwise 10 Hz 500 MHz 500 MHz 26 5 GHz switch 10 Hz 500 MHz 50 R l MO switch l MR 6 On the spectrum an...

Page 105: ... 9 Reconnect W22 to A2J8 The microwave frequency counter should read 16 MHz If the counter reads 16 MHz and the display is still distorted perform the display adjustments in Display Adjustment in this chapter 10 On the spectrum analyzer press CAL REXICN LO arrd IF to clear any error messages Adjustment Procedures 2 65 ...

Page 106: ...up the Al4 frequency control assembly 2 Disconnect W33 gray brown coax cable from A15J701 3 Connect the signal at A15J701 to the input of the HP 8566A B spectrum analyzer 4 Reconnect the power cord and press m to turn the spectrum analyzer on 5 Set the center frequency of the HP 8566A B to 600 MHz and set the frequency span and resolution bandwidth of the HP 8566A B for the best display of the 600...

Page 107: ...software is designed to adjust the flatness and preselector of the spectrum analyzer in a minimum amount of time The frequency response adjustment software automates the most tedious spectrum analyzer adjustment the adjustment would take over two hours if done manually The software can allow the adjustment to be performed in less than 20 minutes The frequency response adjustment requires making se...

Page 108: ...e HP 85643 and 85653 spectrum analyzers Controller Computer Frequency Response Adjustment software requires using any combination of one of the following HP controllers and the HP BASIC operating system Controller HP 9000 model 216 HP 9000 model 236 HP 9000 model 310 Operating System HP BASIC 2 0 with extensions 2 1 HP BASIC 3 0 and required BIN files HP BASIC 4 0 and required BIN files Other HP 9...

Page 109: ...sufficient warmup time for test equipment Refer to their individual operating and service manuals for warmup specifications Spectrum Analyzer Warmup Warm the spectrum analyzer up for at least fifteen minutes before performing the first adjustment Table 3 1 Required Test Equipment Summary Type of Equipment Controller Synthesized sweeper 10 MHz to 13 2 GHz HP 8340A B or HP 83640A or HP 83650A Measur...

Page 110: ...ctrum analyzer to it as well If the controller has dual HP IB connectors connect the spectrum analyzer under test to the second HP IB typically select code 8 10 MHz Reference The 10 MHz REF IN OUT on the spectrum analyzer under test should be connected to the synthesized sweeper 10 MHz Reference Output That is it should be connected to the 10 MHz REF OUTPUT of the HP 8340A B HP 83640A or HP 83650A...

Page 111: ...re and start the program running Program Operation The frequency response adjustment consists of three menus They are the Conditions Menu the Adjust Menu and the Sensor Utilities Menu which are accessed from the Conditions Menu Program operation is controlled through a combination of softkeys and user prompts Some prompts primarily in the Conditions and Sensor Utilities Menus require computer keyb...

Page 112: ...tries for Operator Test Conditions and Other Comments can be up to 37 characters long but only the first 25 characters of the Operator entry are printed on the test record System Mass Storage File Location Calibration factor data for different power sensors and a customized set of conditions may be stored on disk The mass storage unit specifier msus for the disk containing this information should ...

Page 113: ... It is not necessary to use all the test equipment listed Some model numbers listed are alternates Table 3 l lists the test equipment required and alternates Entering zero as the test equipment address results in that model number being unavailable in the program NA is displayed in the address field To minimize possible confusion later enter a zero for the address of each piece of test equipment t...

Page 114: ...ch address n Serial and model number of the spectrum analyzer under test are queried Refer to Adjust Menu in this chapter for more details on running the adjustments Verifying the HP IB To see which test equipment responds on HP IB press Verify Bus This check only verifies that there is a response at the address listed it cannot tell that a particular piece of equipment is at a particular address ...

Page 115: ...ing a Power Sensor Data File To add a new power sensor data file press Add File and enter the power sensor model number as requested An error message is displayed if a disk at the current system mass storage file location is not found When prompted for the power sensor serial number enter only the last five digits the serial number suffix You are then prompted for a cal factor frequency and for th...

Page 116: ...urning to the Conditions Menu the system mass storage file location is the one determined in the Sensor Utilities Menu Listing Available Power Sensor Data Files Press List Files to list all power sensor data files on the currently specified system mass storage location file Returning to the Conditions Menu Press Cond Menu to return to the Conditions Menu Adjust Menu The Adjust Menu displays the on...

Page 117: ...perature or improved power meter accuracy is desired it is advisable to recalibrate the sensor more often than the program requires Press Cal Sensor and follow the instructions on the computer screen to recalibrate the power sensor List Equipment To obtain a list of required test equipment for running a test move the pointer to the test press List Equip All HP IB controlled equipment and passive d...

Page 118: ...uter display Press the RETURN or ENTER keys to terminate an entry Verify Bus Query DUT S N checks each listed HP IB address for response Verify flus does not verify that a particular piece of equipment is at a specified address queries the HP IB for the serial number and model number of the spectrum analyzer under test Store Conds stores the current conditions in the CONDITIONS file on the specifi...

Page 119: ...ndicated by the pointer once allows you to recalibrate the current power sensor and resets the internal time since last calibration timer lists the required equipment for the test indicated by the pointer returns to the Conditions Menu Frequency Response Adjustment Software 3 13 ...

Page 120: ...cy and the slope DAC value is optimized at a high frequency The frequency response adjustment consists of applying a signal of known amplitude at several different frequencies to the specturm analyzer At each frequency the RF GAIN DAC co rolling the flatness compensation amplifiers is adjusted to place the displayed signal at the same place on screen When tuned to a frequency in a preselected band...

Page 121: ... Cal YIG Tuned Filter Mixer RYTHM and Frequency Response Adjustment BNC CABLE f I 50 n 7ADAPTER APC 3 5 CABLE 0 E Figure 3 1 Front End Cal Adjustment Setup REF sl132e Frequency Response Adjustment Software 3 15 ...

Page 122: ...stem file location is not compatible WARNING CONDITIONS files from Operation Verification programs for the HP 8560 A B Series or HP 8560 E Series analyzers are not compatible with the frequency response adjustment software Put the frequency response adjustment software in a different directory than the Operation Verification programs if possible Default CONDITIONS data will be used Change the mass...

Page 123: ...s storage file location specifier Check the sensor model and serial numbers and the system mass storage file location Power meter reads value dBm The power meter has read a value far exceeding the specification of the CAL OUTPUT amplitude check that power sensor is connected to CAL OUTPUT and press any key The power will be read once more and assumed to be valid Select code value does not currentl...

Page 124: ... adjustment software Put the frequency response adjustment software in a different directory than the Operation Verification programs if possible Default CONDITIONS data will be used Change the mass storage file location to a different location than either of the operation verification programs Then modify the conditions data as necessary and press STORE CONE3 Error Messages Beginning with Numeric...

Page 125: ...ured the amplitude to be outside the f5 dB range Check test setup source model number signal not in 1 5 dBm range The source indicated was set for 5 dBm output and the source output is fed through a power splitter to the spectrum analyzer under test The spectrum analyzer should measure the amplitude to be within 5 dB of 1 dBm 6 dB loss through power splitter Check test setup source model number lO...

Page 126: ... YTO Al3 Second Converter Procedure 9 Al4 and Al5 Assemblies Procedure 10 Al6 Fast ADC and Al7 CRT Driver Procedure 11 Bl Fan Procedure 12 BTl Battery Procedure 13 Rear Frame Rear Dress Panel Procedure 14 W3 Line Switch Cable Procedure 15 EEROM A2U501 Procedure 16 A21 OCXO Non Option 103 Tools required to perform the procedures are listed in Table 4 l The words right and left are used throughout t...

Page 127: ...um analyzer All six assemblies are attached to the right side frame of the spectrum analyzer with hinges and fold out of the spectrum analyzer allowing access to all major assemblies See Figure 4 l n To remove the spectrum analyzer cover assembly refer to procedure 1 w To access the A2 A3 A4 and A5 assemblies refer to procedure 5 w To access the Al4 and Al5 assemblies refer to procedure 9 n To rem...

Page 128: ... 16 inch open end wrench 3 mm hex Allen wrench 4 mm hex Allen wrench No 4 hex Allen wrench No 6 hex Allen wrench 7 mm nut driver 3 8 inch nut driver 7 16 inch nut driver 9 16 inch nut driver drilled out end covered with heatshrink tubing Small No 1 pozidrive screwdriver Large No 2 pozidrive screwdriver T 8 TORX screwdriver T 10 TORX screwdriver T 15 TORX screwdriver Long nose pliers Wire cutters H...

Page 129: ... the cover assembly off towards the rear of the instrument Caution When replacing the spectrum analyzer cover use caution to avoid damaging any cables 3 When installing the cover assembly be sure to locate the cover air vent holes on the bottom side of the spectrum analyzer Attach with the four screws loosened in step 2 and tighten the four screws gradually to ensure that the cover is seated in th...

Page 130: ... See Figure 4 2 9 Keep the high voltage probe on the post accelerator connector until the voltage has dropped to a voltmeter reading of less than 5 mV less than 5 V at the connector This normally takes about 30 seconds 10 Disconnect the line power cord from the spectrum analyzer Warning To avoid possible electrical shock in the next step use a screwdriver having a conductive metal shank and tip wi...

Page 131: ...rum analyzer on its right side frame with the front frame assembly hanging over the front edge of the workbench 16 Fold out the Al4 and Al5 assemblies as described in steps 3 and 4 under Procedure 9 Al4 and Al5 Assemblies Removal 4 8 Assembly Replacement ...

Page 132: ...al at A8AlW3 is 9 kV Failure to discharge A8AlW3 correctly may result in severe electrical shock to personnel and damage to the instrument CONDUCTIVE SHAFT A6AlW3 CL I P LEAD INSULATED HANDLE Figure 4 2 Discharging High Voltage on the CRT Assembly Replacement 4 7 ...

Page 133: ...1 19 Disconnect W42 from A7 and the front panel First LO OUTPUT connector 20 Disconnect W36 coax 86 from the front panel IF INPUT connector 21 Remove the VOLUME knob and potentiometer from the front panel If necessary drill out the nut driver used to remove the VOLUME potentiometer and cover the tip with heatshrink tubing or tape to avoid scratching the enameled front panel 22 Use a 9 16 inch nut ...

Page 134: ... frame assembly to the right side frame of the spectrum analyzer See Figure 4 4 sll16e Figure 4 4 front frame Mounting Screws 27 Remove the three screws securing the front frame assembly to the left side frame of the spectrum analyzer 28 Remove the four screws 1 Figure 4 3 securing the CRT mounts to the deck 29 Pull the cable tie 1 to free W9 See Figure 4 5 Gently pry W9 the CRT cable from the end...

Page 135: ... with the silver coated edge towards the inside of the spectrum analyzer 1 Place the spectrum analyzer on its right side frame with the front end extending slightly over the front of the work bench 2 Gently place the Al8 CRT assembly into the Al front frame assembly as illustrated in Figure 4 6 3 Place the front frame and CRT assemblies into the spectrum analyzer using caution to avoid pinching an...

Page 136: ...screws per side See Figure 4 4 9 Retighten the four screws securing the CRT mounts to the deck 10 Place W9 between the CRT assembly and the A6 power supply assembly top shield so that the W9 wires are below the surface of the top shield 11 Connect W42 to A7J5 and the front panel First LO OUTPUT connector 12 Use a 9 16 inch nut driver to reconnect CAL OUTPUT connector to the front panel 13 Connect ...

Page 137: ...crew is captive 18 Fold up the Al4 and Al5 assemblies as described in Procedure 9 Al4 and Al5 Assemblies Replacement steps 3 through 5 19 Place the spectrum analyzer top side up on the work bench and connect AlAlWl to A3J602 20 Snap post accelerator cable A6AlW3 to the A18 CRT assembly 21 Snap the black grommet protecting the A6AlW3 into the CRT shield 22 Fold up assemblies A2 A3 A4 and A5 as desc...

Page 138: ...r keypad Note The front panel softkey actuators are part of the CRT bezel assembly and are not replaceable Should the softkeys become damaged replace the bezel assembly Replacement 1 Install the rubber keypad ensuring that the screw holes are visible through the pad 2 Place the AlAl keyboard assembly over the rubber keypad Secure with nine panhead screws 3 Connect the RPG cable to AlAlJ2 and AlWl ...

Page 139: ...RPG shaft to the front panel 4 Remove the RPG Replacement 1 Place the RPG into the front frame with the cable facing the bottom of the spectrum analyzer Place a lock washer and nut on the RPG shaft to hold it in the frame 2 Use a 7 16 inch nut driver to secure the RPG assembly to the front frame 3 Connect the RPG cable to AlAlJ2 4 Attach the RPG knob using a number 6 hex Allen wrench 5 Replace the...

Page 140: ...assemblies as a unit and the A4 and A5 assemblies as a unit Folding out one assembly at a time binds the hinges attaching the assemblies and may damage an assembly and hinge 5 The board assemblies are attached to the right side frame of the spectrum analyzer with two hinges Fold both the A2 and A3 assemblies out of the spectrum analyzer as a unit 6 Fold both the A4 and A5 assemblies out of the spe...

Page 141: ...ly in the folded out position and attach ribbon cables W1 and W2 4 Attach all coaxial cables to the assembly as illustrated in Figure 4 8 5 Locate the cable clip on the inside of the right side frame Make sure that the coaxial cables are routed properly on the clip as illustrated in Figure 4 9 6 Lay the A2 A3 A4 and A5 assemblies flat against each other in the folded out position Make sure that no...

Page 142: ...Procedure 5 A2 A3 A4 and A5 Assemblies 4 PLACES cl Q 4 3 P T c W42 w4 3 BENEATH C A B L E S sl12e Figure 4 8 Assembly Cables 1 of 2 Assembly Replacement 4 17 ...

Page 143: ...Procedure 5 A2 A3 A4 and A5 Assemblies W52 w29 WH I TE VIOLET W27 ORANGE Figure 3 8 Assembly Cables 2 of 2 sll8e 4 18 Assembly Replacement ...

Page 144: ...able assemblies The standoffs on the A5 assembly must fit into the cups on the A6 power supply top shield 9 Fold the A2 and A3 assemblies together as a unit into the spectrum analyzer Be sure to fold HP IB cable A19Wl between the A3 and A4 assemblies using the two sets of hook and loop Velcro fasteners 10 Fold ribbon cable AlAlWl between A3 and A4 assemblies Take care to dress the protective tubin...

Page 145: ... A3 A4 and A5 Assemblies 12 Secure the assemblies using the eight screws removed in Removal step 3 See Figure 4 7 AlAlWl A3 J602 A19Wl w4 SK133 Figure 4 10 HP IB and AlAl Wl Cable Placement 4 20 Assembly Replacement ...

Page 146: ... discharging the A6AlW3 post accelerator cable Make sure that the spectrum analyzer line power switch is in the off position 6 Connect a high voltage probe lOOO l such as the HP 34111A to a voltmeter with a 10 megohm input 7 Connect the clip lead of the probe ground to the chassis of the spectrum analyzer 8 Slip the tip of the high voltage probe under the rubber shroud of the A6AlW3 post accelerat...

Page 147: ...cement 1 Ensure that the bottom shield wall is in place before replacing the A6 power supply assembly 2 Attach the A6 power supply assembly to the spectrum analyzer chassis and top shield wall using the four screws 3 Connect Wl to A6J1 W3 to A6J2 fan power wires to A6J3 W8 to A6J4 and the line power jack to A6JlOl See Figure 4 11 4 Secure the A6Al high voltage assembly to the A6 power supply assem...

Page 148: ...1 k f i I Procedure 6 A6 Power Supply Assembly AGAIWI A6A 1 0 0 0 0 r w 3 FAN POWER CABLE T I E TORX SCREW L I N E POWER WI TORX SCREWS Figure 4 l 1 A6 Power Supply Connections Assembly Replacement 4 23 ...

Page 149: ...thead screws 1 See Figure 4 12 One end of the cover fits into a slot provided in the rear frame assembly Ensure that the extended portion of the cover shield is seated in the shield wall groove 8 Fold the A2 A3 A4 and A5 assemblies into the spectrum analyzer as described in Procedure 5 A2 A3 A4 and A5 Assemblies Replacement steps 6 through 12 Figure 4 12 Power Supply Cover SP14E 4 24 Assembly Repl...

Page 150: ...ure that the spectrum analyzer line power switch is in the off position 6 Connect a high voltage probe lOOO l such as the HP 34111A to a voltmeter with a 10 megohm input 7 Connect the clip lead of the probe ground to the chassis of the spectrum analyzer 8 Slip the tip of the high voltage probe under the rubber shroud of the A6AlW3 post accelerator cable to obtain a reading on the voltmeter See Fig...

Page 151: ...bly 20 Disconnect the tie wraps from the A6Al assembly cables and remove the A6Al high voltage assembly from the spectrum analyzer 2 Q oc 10 Figure 4 13 Al6 Fast ADC and Al7 CRT Driver Mounting Screws Replacement B B 3 s1115e 1 Secure the A6Al high voltage assembly to the A6 power supply using three panhead screws Connect ribbon cable A6AlWl to A6J5 2 Snap post accelerator cable A6AlW3 to the CRT ...

Page 152: ...properly seated in the right end of the slot 9 Secure the Al7 assembly and Al6 assembly in Option 007 with the two flathead screws removed in step 18 under Removal See Figure 4 13 2 10 For Option 007 spectrum analyzers Connect the two mounting posts to the left side frame using the two screws removed in step 17 under Removal See Figure 4 13 1 11 Fold the A2 A3 A4 and A5 assemblies into the spectru...

Page 153: ...scribed in Procedure 5 A2 A3 A4 and A5 Assemblies A7 First LO Distribution Amplifier A8 Low Band Mixer A9 Input Attenuator A10 YIG Tuned Filter Mixer RYTHM All YTO Al3 Second Converter Figure 4 14 illustrates the location of assemblies and major cable locations Note Use a torque wrench to tighten all SMA connectors to 113 Ncm 10 in lb HP part number 8710 1655 can be used for this purpose The style...

Page 154: ...edure 6 A7 through Al3 Assemblies FL1 A l 3 FL2 W48 W33 w 5 7 A8 n w 3 5 w 1 3 W I 0 WI2 A l l WI6 WI 1 Figure 4 14 HP 6562E Assembly Locations W46 w 3 9 w 4 2 AlO 1 w 4 3 A9 sllle Assembly Replacement 4 29 ...

Page 155: ...rom the A7 assembly 6 Remove the assembly and disconnect W34 Replacement 1 Use a 5 16 inch wrench to attach W34 to A7J4 and W42 to A7J5 2 Connect W38 to A7Jl and connect W39 to A7J2 3 Connect W46 to A7J3 4 Connect W42 to the front panel First LO OUTPUT connector 5 Connect cable W12 to the A7 assembly 6 Use two panhead screws to secure A7 to the center deck Be sure to attach the ground lug on the s...

Page 156: ... the two screws securing A8 to the center deck 5 Remove W56 and W39 from the A8 assembly 6 Disconnect W12 from A8 Replacement 1 Place A8 on the center deck and attach W56 and W39 using caution to avoid damaging any of the cables center conductor pins 2 Use two panhead screws to secure A8 to the center deck Reconnect W45 to FL1 and A8 3 Tighten all semirigid coax connections on A8 and FLl torque th...

Page 157: ...s attached to the attenuator The bracket should be on the same end as the ribbon cable connector 2 Connect the attenuator control ribbon cable to the A9 input attenuator 3 Place the A9 input attenuator into the spectrum analyzer with the A9 mounting brackets resting against the front frame center support and the right side frame Use caution to avoid damaging any cables 4 Attach the attenuator to t...

Page 158: ...A9 Input Attenuator 9 c 9 d 1 slll3e Figure 4 15 A9 Mounting Screw at Right Side Frame Assembly Replacement 4 33 ...

Page 159: ...s a unit and disconnect W48 from AlOJl Remove four screws 1 securing A10 to the center deck These screws are located on the top side of the center deck as illustrated in Figure 4 16 4 P I 3 P I Figure 4 16 A10 Mounting Screws Replacement 1 Orient the A10 assembly for the proper cable connections 2 Connect W43 44 and 46 to AlOJ3 J2 and J4 respectively 3 Connect W48 gray cable to AlOJl 4 Connect W16...

Page 160: ...nt 1 Connect WlO ribbon cable to the All YTO assembly 2 Orient the All assembly in the spectrum analyzer so its four mounting holes line up with the holes in the right side frame and the output connector is lined up with W38 3 Secure the All assembly to the right side frame using four screws 4 Connect W38 to All 5 Install W56 FL2 W57 between A8J2 and A13Jl 6 Reconnect W16 ribbon cable to the A10 a...

Page 161: ...om A13Jl 5 Remove the four screws securing Al3 to the main deck and remove the assembly 6 Disconnect ribbon cable W13 from the Al3 assembly Replacement 1 Connect ribbon cable W13 to the Al3 assembly 2 Secure Al3 to the spectrum analyzer main deck using four panhead screws 3 Connect W33 coax 81 to A13J4 600 MHz IN jack 4 Connect W35 coax 92 to A13J2 310 7 MHz OUT jack 5 Connect W48 coax 8 to A13J3 ...

Page 162: ...alyzer Cover 2 Place the spectrum analyzer on its right side frame 3 Remove the eight screws 1 holding the Al4 and Al5 assemblies to the bottom of the spectrum analyzer See Figure 4 18 1 P Figure 4 18 Al4 and A15 Assembly Removal I I A 1 s1112e Caution Washers are not captive Loose washers in instrument may cause internal damage Assembly Replacement 4 37 ...

Page 163: ...ounds Applying excessive torque will cause the screws to stretch Replacement 1 Attach the removed assembly to the two chassis hinges with two panhead screws 2 Attach all cables to the assembly as illustrated in Figure 4 19 Torque the W34 A15 SMA connection to 113 Ncm 10 in lb 3 Lay the Al4 and Al5 assemblies flat against each other in the folded out position Make sure that no cables become pinched...

Page 164: ...0 5 i W18 w32 A 1 4 w 3 7 WI w2 w4g w50 w22 w31 w37 w51 NOT USED w33 AIAI 0 0 0 0 0 kA l 8 D COMPONENTSlDE q J WI3 WI0 w34 W16 WI2 WI 1 A l 5 W32 w19 OPTION 0 0 1 w 3 5 W36 A l 5 W32 SI 14e Figure 4 19 Al4 and Al5 Assembly Cables Assembly Replacement 4 39 ...

Page 165: ...ng the two board mounting posts to the left side frame and remove the posts See Figure 4 20 4 Remove two screws 2 securing the Al7 assembly and Al6 assembly in Option 007 to the left side frame Remove the two spacers non Option 007 5 Pull the Al7 assembly out of the spectrum analyzer 6 For Option 007 spectrum analyzers Pull the Al6 assembly out of the spectrum analyzer 7 Disconnect W7 W8 W9 A6AlW2...

Page 166: ...o the center deck mounting slot nearest the left side frame 3 Secure the Al7 assembly and Al6 assembly in Option 007 to the left side frame using two flathead screws and two spacers in non Option 007 For Option 007 Attach the board mounts to the left side frame using two flathead screws 1 See Figure 4 20 4 Place the spectrum analyzer on its right side frame 5 Fold the A2 A3 A4 and A5 assemblies in...

Page 167: ...he fan assembly to the rear frame 2 Remove the fan and disconnect the fan wire from the A6 power supply assembly 3 To reinstall the fan connect the fan wire to A6J3 and place the wire into the channel provided on the left side of the rear frame opening Secure the fan to the rear frame using four panhead screws Note The fan must be installed so that the air enters through the front and sides of the...

Page 168: ...the instrument is turned off stored states and traces will only be retained for a short time and may be lost Refer to State and Trace Storage Problems in chapter 10 Controller Section in this manual The battery should be replaced if its voltage is t2 6 V or less Removal Replacement 1 Remove any option module attached to the rear panel 2 Locate the battery assembly cover on the spectrum analyzer re...

Page 169: ...e power cord to provide proper grounding while discharging the A6AlW3 post accelerator cable Make sure that the spectrum analyzer line power switch is in the off position 7 Connect a high voltage probe lOOO l such as the HP 34111A to a voltmeter with a 10 megohm input 8 Connect the clip lead of the probe ground to the chassis of the spectrum analyzer 9 Slip the tip of the high voltage probe under ...

Page 170: ...t securing the earphone jack Carefully remove the jack using caution to avoid losing the lock washer located on the inside of the rear frame assembly Replace the washer and nut onto the jack for safekeeping 20 Remove the rear frame assembly 21 To remove the rear dress panel remove the two nuts located on the inside of the rear frame near the display adjustment holes SK147 Figure 4 22 Main Deck Scr...

Page 171: ...Solder the red wire to the positive lug of the battery assembly and the black wire to the negative lug Replace the battery 9 Secure the battery assembly to the rear frame using two flathead screws 10 Connect the fan and line power cables to A6J3 and A6JlOl on the A6 power supply 11 Snap the A6AlW3 post accelerator cable to the CRT assembly 12 Snap the black grommet protecting A6AlW3 into the CRT s...

Page 172: ...Procedure 13 Rear Frame Rear Dress Panel Figure 4 23 A6 Power Supply Cover SP14E Assembly Replacement 4 47 ...

Page 173: ... HP 34111A to a voltmeter with a 10 megohm input 7 Connect the clip lead of the probe ground to the chassis of the spectrum analyzer 8 Slip the tip of the high voltage probe under the rubber shroud of the A6AlW3 post accelerator cable to obtain a reading on the voltmeter See Figure 4 2 9 Keep the high voltage probe on the post accelerator connector until the voltage has dropped to a voltmeter read...

Page 174: ...embly to the front frame The screw is captive See Figure 4 25 A6A 1 w9 i Figure 4 24 W3 Dress and Connection to A6 Power Supply SI 11le 19 Remove AlWl and AlWlDSl from the line switch assembly Let each hang freely Note If contact removal tool HP part number 8710 1791 is available complete assembly removal by performing Removal steps 20 and 21 If not skip to Removal step 22 Assembly Replacement 4 4...

Page 175: ...p the procedure here do not perform steps 22 23 and 24 22 Remove the Al front frame assembly and Al8 CRT assembly as described in Procedure 2 Al Front Frame Al8 CRT Removal steps 16 through 29 23 Remove the left side frame from the spectrum analyzer using the hardware listed below The side frame will still be attached by the speaker wires Do not let it hang freely Screw Quantity 1 SCREW MACH M4 X ...

Page 176: ...Procedure 14 W3 Line Switch Cable STANDOFF SI 13e Figure 4 25 Line Switch Mounting Screw and Cable Dress Assembly Replacement 4 5 1 ...

Page 177: ...SK151 Figure 4 26 W3 Cable Connector Replacement Using Contact Removal Tool HP part number 87104791 1 Ensure that the action of the switch is working properly With a pair of wire cutters clip the tie wrap holding the cable to the contact housing of the replacement W3 assembly 2 Using the contact removal tool remove the four wires from the replacement cable assembly connector 4 52 Assembly Replacem...

Page 178: ... 13 Redress W3 and the other cable assemblies down between the CRT assembly and the power supply cover such that the W9 wires are below the surface of the power supply cover 14 Fold up the A2 A3 A4 and A5 assemblies into the spectrum analyzer as described in Procedure 5 A2 A3 A4 and A5 Assemblies Replacement steps 5 through 10 15 Fold up Al4 and Al5 assemblies as described in Procedure 9 Al4 and A...

Page 179: ... 4 12 11 Place W3 and the other cable assemblies between the CRT assembly and the power supply cover so the W9 wires are below the surface of the power supply cover 12 Fold up the A2 A3 A4 and A5 assemblies into the spectrum analyzer as described in Procedure 5 A2 A3 A4 and A5 Assemblies Replacement steps 5 through 10 13 Fold up Al4 and Al5 assemblies as described in Procedure 9 Al4 and Al5 Assemb...

Page 180: ... EEROM 8 Turn the HP 85623 LINE switch off then on cycling the spectrum analyzer power Allow the power on sequence to finish 9 If error message 701 702 or 703 is displayed press m MORE and RECALL ERRORS Use the STEP keys to view any other errors 10 If error message 701 or 703 is displayed perform Adjustment 9 Frequency Response Adjustment in chapter 2 Adjustment Procedures If a TAM is available pe...

Page 181: ... described in Procedure 9 Al4 and Al5 Assemblies Removal steps 3 and 4 4 Remove the three screws 1 securing the OCXO to the main deck See Figure 4 28 5 Disconnect W49 coax 82 from the OCXO and disconnect W50 orange cable from the Al5 RF assembly Clip the tie wraps that hold W49 and W50 together and remove the OCXO from the spectrum analyzer with the orange cable connected sl16e Figure 4 28 A21 OCX...

Page 182: ...the spectrum analyzer main deck using three screws 1 See Figure 4 28 3 Connect W50 to A15J306 Install tie wraps to hold W49 and W50 together 4 Fold the Al4 and Al5 assemblies into the spectrum analyzer as described in Procedure 9 Al4 and Al5 Assemblies Removal 5 Perform the rear frame assembly replacement procedure described in Procedure 13 Rear Frame Rear Dress Panel Removal Assembly Replacement ...

Page 183: ...timely processing of your order To order a part that is not listed in the replaceable parts table include the instrument model number the description and function of the part and the number of parts required Address the order to the nearest Hewlett Packard office Direct Mail Order System Within the USA Hewlett Packard can supply parts through a direct mail order system Advantages of using the syst...

Page 184: ...er is 800 227 8164 is available 6 am to 5 pm Pacific standard time Monday through Friday and 916 785 8HOT for after hours weekends and holidays Hotline orders are normally delivered the following business day Parts List Format The following information is listed for each part 1 The Hewlett Packard part number 2 The part number check digit CD 3 The total quantity Qty in the assembly This quantity i...

Page 185: ...iezoelectric Signaling Device Transistor Quartz Visible T r i o d e T h y r i s t o r Z Tuned Cavity E Miscellaneous Electrical Part R Resistor Tuned Circuit A 4 Across Flats Acrylic Air Dry Method Ampere 4DJ Adjust Adjustment 4NSI American National Standards Institute formerly USASI ASA 4SSY Assembly 4WG American Wire Gage B 3CD Binary Coded Decimal 3D Board Bundle 3E CU Beryllium Copper 3NC Type...

Page 186: ...uency Feet Foot F X D F i x e d G GEN General Generator GND Ground GP General Purpose Group II H Henry High HDW Hardware HEX Hexadecimal Hexagon Hexagonal HLCL Helical HP Hewlett Packard Company High Pass I C Collector Current Integrated Circuit ID Identification Inside Diameter IF Forward Current Intermediate Frequency N Inch 1NCL Including NT Integral Intensity Internal J J FET Junction Field Ef...

Page 187: ... Polyamide SST Stainless Steel STL Steel 0 SUBMIN Subminiature Q Figure of Merit s z Size DA Over All 3D Outside Diameter R 3P AMP Operational Amplifier R Range Red T 3PT Optical Option Resistance Resistor Optional Right Ring T Teeth REF Reference Temperature P RES Resistance Resistor Thickness Time RF Radio Frequency Timed Tooth PA Picoampere Power RGD Rigid Typical Amplifier RND Round TA Ambient...

Page 188: ...Wound X X By Used with Dimensions Rmrt n nre Z ZNR Zener MULTIPI Abbreviation Prefix Multiple T tera 1012 G giga log M mega lo6 k kilo lo3 da deka 10 d deci 10 i C centi 10 s Abbreviation Prefix Multiple m milli 10 s P micro 10 s n nano 10 s P pica 10 12 f femto 10 15 a atto 10 i Table 5 2 Manufacturers Code List Refer to the Manufacturers Code List in the HP 8560 E Series Spectrum Analyzer Compon...

Page 189: ...N KB TO SHFT EXT SCREW MACH M3 x 0 5 GMM LG PAN HD SCREW MACH M3 5 x 0 6 GMM LG PAN HD SCREW MACH M3 5 x 0 6 GMM LG SCREW MACH M5 x 0 8 12 MM LG PAN HD SCREW METRIC SPECIALTY M4 x 0 7 THD 7MM MOUNT FLANGE SCREW MACH M4 x 0 7 lOMM LG PAN HD WRENCH HEX KEY ASSEMBLY INSTRUCTIONS OPTION 909 RACK KIT WITH FLANGES AND HANDLES Includes Parts Listed Below PANEL DRESS PANEL SUB SUPPORT REAR FRAME FRONT FRA...

Page 190: ... 55716 2848C RACK SLIDE KIT 1 SLIDE CHAS 25 IN LG 21 84 IN TRVL 01561 Includes Parts Listed Below Slides Cannot be Ordered Separately 4 SCREW MACH M5 x 0 8 14MM LG PAN HD 2848C 9 SCREW MACH M4 x 0 7 12MM LG 28480 4 SCREW MACH M4 x 0 7 12MM LG PAN HD 28480 8 NUT CHANNEL M4 x 0 7 3 5MM THK 10 3MM WD 28480 MAJOR ASSEMBLIES FRONT FRAME ASSEMBLY not available as a field replacement The Al assembly incl...

Page 191: ...EXCHANGE REQUIRED 28480 5086 6885 A8 5086 7982 1 LOW BAND MIXER 28480 5086 7982 A9 5086 7822 5 1 PORT ATTENUATOR 28480 5086 7822 A10 5086 7981 1 YIG TUNED FILTER MIXER RYTHM 28480 5086 7981 5086 6981 REBUILT AlO EXCHANGE REQUIRED 28480 5086 6981 A l l 5086 7906 6 1 PORTABLE LVLD YTO 28480 5086 7906 5086 6906 REBUILT All EXCHANGE REQUIRED 28480 5086 6906 Al3 5086 7959 1 SECOND CONVERTER 28480 5086 ...

Page 192: ...R 4 4 GHz NOT ASSIGNED LINE FILTER ASSEMBLY LOUDSPEAKER 2 5 IN SQ Part of W5 CHASSIS MECHANICAL PARTS See Figure 5 l through Figure 5 6 for a complete listing of mechanical chassis parts ASSEMBLY SHIELDS PEAK DETECTOR TOP PEAK DETECTOR BOTTOM SCREW M2 5 14L SCREW M2 5 9 5L D RING 070ID WSHR LK M2 5ID Reference Designation Al6 Option 007 Al7 Al8 Al8MPl A18MP2 A18Vl A18Wl A20 A21 Standard Bl BTl Fl ...

Page 193: ...WSHR LK M2 5ID O RING 070ID IF 1 TOP IF 1 BOTTOM IF 2 TOP IF 2 BOTTOM SCREW 5MM 2 5 16 PNPDS O RING 070ID WSHR LK M2 5ID FC TOP FC BOTTOM SCREW 5MM 2 5 16 PNPDS O RING 070ID WSHR LK M2 5ID REF TOP REF BOTTOM SYNTHZR TOP SYNTHZR BOTTOM SIGPATH TOP SIGPATH BOTTOM BRACE RF BD SCREW SCREW 5MM 2 5 16 PNPDS O RING 070ID WSHR LK M2 5 ID SCREW 2 5M X 8MM LG TORX Mfi Mfr Part Code Number 28480 5063 0220 28...

Page 194: ...N DRIVE A14J6 to A9 CABLE ASSEMBLY A7 A8 DRIVE A14JlO to A7 and A8 Part of Cable Assembly Microcircuit 08562 60045 CABLE ASSEMBLY RIBBON Al3 2ND CONV DRIVE A14J12 to A13 Part of Cable Assembly Microcircuit 08562 60045 NOT ASSIGNED NOT ASSIGNED Reference Designation HP Part Number c D Wl 8120 5682 8 w 2 5061 9025 2 w 3 5062 0728 6 w 4 5061 9033 2 w 5 5062 4838 W6 5062 0767 w 7 8120 5697 w 7 Option ...

Page 195: ... 0720 A3J102 to Rear Panel J4 W25 5062 0718 4 1 CABLE ASSEMBLY COAX 4 BLANKING 28480 5062 0718 OUT A3J601 to Rear Panel JS W27 5062 0714 0 1 CABLE ASSEMBLY FILTER 10 7 MHz 28480 5062 0714 A5J5 to A4J3 w29 5062 0711 7 1 CABLE ASSEMBLY COAX 7 10 7 IF 28480 5062 0711 A15J601 to A5J3 w31 5062 0722 0 1 CABLE ASSEMBLY COAX 8 REF IN OUT 28480 5062 0722 Option 005 A15J301 to Rear Panel J9 W32 5062 0705 9 ...

Page 196: ...5022 1081 W46 5022 2819 1 CABLE ASSEMBLY SEMI RIGID 28480 5022 281E A7J3 to AlOJ4 w47 NOT ASSIGNED W48 8120 5660 2 1 CABLE ASSEMBLY COAX 8 1ST IF 28480 8120 566C HI BAND AlOJl to A13J3 w49t 5062 4892 3 1 CABLE ASSEMBLY COAX A21 OCXO 82 28480 5062 4892 A21 to A15J305 wsot 5063 0245 4 1 CABLE ASSEMBLY OCXO 28480 5063 0245 A21 to A15 Includes A21 w51 5062 6478 5 1 CABLE ASSEMBLY COAX 84 10 MHz REF2 2...

Page 197: ...tification Assembly Mounting Qty Description 11 SCREW MACH M3 X 30MM LG PAN HD TORX 3 SCREW MACH M3 X GOMM LG PAN HD TORX 2 SCREW MACH M3 X lOOMM LG PAN HD TORX 13 SCREW MACH M3 X GMM LG PAN HD TORX 2 SCREW MACH M3 X 12MM LG PAN HD TORX Mfr Part Number 0515 1349 0515 2310 0515 2308 0515 2332 0515 0664 Replaceable Parts 5 15 ...

Page 198: ... GEAR SOCKET GEAR HANDLE PLATE BACKUP PLATE SCREW MACH M4 X 8MM LG SODEG FLH HD SCREW MACH M5 X 16MM LG COVER MOISTURE DEFLECTOR LF MOISTURE DEFLECTOR RT SIDE TRIM SCREW MACH M4 X lOMM LG PAN HD REAR FOOT O RING 145 lN XSECT DIA SIL WASHER LK HLCL 5 0 MM 5 1 MM ID SCREW SKT HD CAP M5 X 40MM LG INSULATOR 292 X 355 MM 51 THK Mfi Code 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 28480 ...

Page 199: ... X 8MM LG PAN HD TORX MAIN DECK FRONT END DECK SCREW MACH M4 X 8MM LG FLH HD TORX SCREW MACH M3 X GMM LG FLH HD TORX SIDE FRAME SCREW MACH M4 X 8MM LG FLH HD TORX SCREW MACH M3 X GMM LG FLH HD TORX SCREW MACH M3 X GMM LG FLH HD TORX SCREW MACH M3 X GMM LG FLH HD TORX MOUNTING POST HINGE 2 BOARD HINGE 4 BOARD CABLE CLAMP SCREW MACH M3 X 35MM LG TORX SCREW MACH M3 X GMM LG FLH HD TORX LABEL ASSEMBLY...

Page 200: ... PAN HD TORX MAIN DECK SCREW MACH M3 X 6MM LG FLH HD TORX FRONTENDDECK SCREW MACHM3 X GMM LG FLH HD TORX SCREW MACH 6 32 375 IN LG TORX SCREW MACH M3 X 8MM LG PAN HD TORX SCREW MACH M3 X GMM LG PAN HD TORX ATTENUATOR BRACKET ATTENUATOR BRACKET SCREW MACH M3 X GMM LG PAN HD TORX SCREW MACH M3 X GMM LG FLH HD TORX SCREW MACH M3 X GMM LG FLH HD TORX SCREW MACH M3 X GMM LG FLH HD TORX 28480 28480 2848...

Page 201: ... FACEPLATE KNOB BASE l 1 8 JGK 252 IN IO INCLUDES ITEM 5 SCREW SET 6 32 125 IN LG SMALL CUP PT NUT HEX DBL CHAM 3 8 32 THD 094IN THK WASHER LK INTL T 3 8 IN 377 IN ID FRONT PANEL DRESS HP 85613 FRONT PANEL DRESS Standard HP 85633 FRONT PANEL DRESS Option 006 HP 85633 PROBE POWER JACK NUT SPCLY 15 32 32 THD l IN THK 562 WD PLUG HOLE Opt 327 not shown ADAPTOR COAX STR F SMA F SMA SCREW MACH M3 X 0 5...

Page 202: ...0UCD IF SOMA MAX KEYCAP LINE O RING lOl IN ID 07 IN XSECT DIA NTRL SCREW MACHINE ASSEMBLY M3 X 0 5 12MM LG SUPPORT CENTER SCREW MACH M4 X 0 7 16MM LG PAN HD TX SCREW MACH M2 5 X 0 45 GMM LG PAN HD TX P O AlWl R VC 20K 20 LOG WASHER FL 250ID12 WASHER LK INTL 256 IN ID NUT HEX l 4 32 THD KNOB RND 125 JG FLANGE MOUNT Opt 026 not shown Mfi Code 00000 28480 28480 28480 28480 2M627 28480 51633 28480 284...

Page 203: ...CREW MACH M3 GMMLG PAN HD TORX 16 8160 0520 7 1 RF1 ROUND STRIP STL SPIRA 150 17 5021 5479 8 1 REAR FRAME 18 5021 6391 5 2 SCREW CONNECTOR HP IB 19 2200 0225 9 2 SCREW MACH 4 40 25 IN LG TORX 20 0535 0082 3 2 NUT M4 0 W LOCKWR 21 0515 0433 6 1 SCREW MACH M3 GMM LG PAN HD TORX 22 0535 0023 2 2 NUT HEX DBL CHAM M4 X 0 7 3 2MM THK Bl 5061 9036 5 1 FAN ASSEMBLY INCLUDES WIRE BTl 1420 0341 5 1 BATTERY ...

Page 204: ...I _I 8560E Series I I sl134e F i g u r e 5 2 P a r t s I d e n t i f i c a t i o n C o v e r A s s e m b l y I I ...

Page 205: ...8560E Series sl131e FIGURE 5 3 PARTS IDENTIFICATION MAIN CHASSIS v ...

Page 206: ...mbly If these brackets are removed and reinstalled the performance of A10 will be altered A new or rebuilt A10 assembly includes new mounting brackets already attached to it 4 E S f c 4 Z I I I f iv 2 sl17e F i g u r e 5 4 P a r t s I d e n t i f i c a t i o n R F S e c t i o n ...

Page 207: ...8 5 6 2 E sl128e 12 9 p3 CES F i g u r e 5 5 P a r t s I d e n t i f i c a t i o n F r o n t F r a m e ...

Page 208: ...I I I 8 5 6 2 E AIY BTl 4 PLACES _ 11 12 OPT9 001 SI 1 3 5 e F i g u r e 5 6 P a r t s I d e n t i f i c a t i o n R e a r F r a m e I I I I ...

Page 209: ...ure 6 9 Rear View Use the list below to determine the figure s illustrating the desired assembly or cable Assemblies Figur e Alfrontframe 6 6 AlAlkeyboard 6 6 A2 controller 6 1 6 2 A3 interface 6 1 6 2 A4 log amplifier Cal oscillator 6 1 6 3 A5IFfilter 6 1 6 4 A6 power supply 6 4 A6Al high voltage module 6 4 A7 first LO distribution amplifier SLODA 6 8 A8 low band mixer 6 8 A9RF attenuator 6 8 A10...

Page 210: ...able 6 4 W9 CRTyokecable 6 4 WlOAll YTO drive cable 6 6 6 8 Wll A9 attenuator drive cable 6 6 W12 A7 LODA drive cable 6 6 6 8 W13 Al3 second conv drive cable 6 6 W14 NOT ASSIGNED W15 NOT ASSIGNED W16AlO drivecable 6 8 W17 NOT ASSIGNED W18 LO sweep coax 97 6 6 W19 Second IF out coax 83 6 5 W20 Zero span video coax 6 6 2 W21 NOT ASSIGNED W22 10 MHz frequency count coax 0 6 2 6 5 W23 ext trigger in c...

Page 211: ...el J4 6 8 W43 semirigid coax A9J2 to AlOJ3 6 8 W44 semirigid coax AlOJ2 to FLlJl 6 8 W45 semirigid coax FLlJ2 to A8Jl 6 8 W46 semirigid coax A7J3 to AlOJ4 6 8 W48firstIF high band 6 8 W49 OCXO 10 MHz out coax 82 6 5 W50 OCXO power part of A21 OCXO assembly 6 5 W51 10 MHz in coax 84 6 3 6 5 W52 cal oscillator out coax 9 6 4 W53 frequency counter coax 1 6 2 6 3 W54 video coax 2 6 2 6 3 W55 audio out...

Page 212: ...Wl w 2 2 BLACK W6 S K 1 5 5 w20 BLUE T O A 2 I N N O N O P T I O N 0 0 7 T O A l 6 I N O P T I O N 0 0 7 W24 GREEN w 5 4 RED w59 G R A Y O R A N G E W H I T E w1 A2 OPTION 0 0 7 Figure 6 2 Top View A2 Unfolded BLUE NON OPTION 0 0 7 A19Wl w 5 3 BROWN s j l l l e 6 4 Major Assembly and Cable Locations ...

Page 213: ...w51 W2 W52 N5A A4 _ w 5 5 w27 Figure 6 3 Top View A2 and A3 Unfolded S K 1 5 7 Major Assembly and Cable Locations 6 5 ...

Page 214: ...ORANGE Wl A 5 A19Wl A 1 9 w 3 W8 W52 WHITE w 2 9 V I O L E T AIAIWI A6Al A21 A l 6 A l 7 W55 LSI A l 8 OPTION 0 0 7 SPllOE Figure 6 4 Top View A2 A3 A4 and A5 Unfolded 6 6 Major Assembly and Cable Locations ...

Page 215: ...WI NOT I w 2 w 4 9 w50 w40 w 2 2 w31 w 3 7 w51 JSED w 3 3 Figure 6 5 Bottom View Al5 Unfolded wig OPTION 001 w 3 5 W36 w 3 4 w29 A l 5 W32 sp166e Major Assembly and Cable Locations 6 7 ...

Page 216: ...WI I O P T I O N 0 0 5 w58 WI8 w32 A14 AIAI A l WI3 W I 0 w34 WI6 WI2 WI 1 A l 5 W32 Figure 6 6 Bottom View Al5 and Al4 Unfolded 6 8 Major Assembly and Cable Locations ...

Page 217: ...w20 C O A X 6 w 7 w 5 9 C O A X a 3 9 sj138e Figure 6 7 Al6 Fast ADC Option 007 Major Assembly and Cable Locations 6 9 ...

Page 218: ...W3 w 4 5 W56 A8 FL1 A l 3 FL2 W48 I WI2 A l l WI6 WI 1 Figure 6 6 HP 6562E Front End I W46 w 3 9 w42 w34 A10 w43 A9 SI 120e 6 10 Major Assembly and Cable Locations ...

Page 219: ...FL 4 Bl Figure 6 9 Rear View BTl A20 SK162 Major Assembly and Cable Locations 6 l1 ...

Page 220: ...s Warning Troubleshooting and repair of this instrument without the cover exposes high voltage points that may if contacted cause personal injury Maintenance and repair of this instrument should therefore be performed only by a skilled person who knows the hazards involved Where maintenance can be performed without power applied the power should be removed When any repair is completed be sure that...

Page 221: ...be manually probed provided caution is used to prevent accidental shorting between adjacent pins Figure 7 l illustrates the pin configuration for the test jack Line names are the same for all test jacks The following mnemonics are used MS measured signal TA test and adjustment module address line and OS output signal Test jack test points are identified on block diagrams by both the jack pin numbe...

Page 222: ...POINTS ON BLOCK D I AGRAM J 4 T E S T J TPI TP2 TP3 P I AMPLIFIER f N J4 MS8 7 PIN NUMBER J4 15 IL TEST POINTS ON CIRCUIT BOARD ASSEMBLY ACK Figure 7 1 Assembly Test Points SK163 General Troubleshooting 7 3 ...

Page 223: ...av 0 3 1 I I 3 2 15V A GND 33 34 l 15v _I I06 l4 5 3 I NC A A GND GND NC I 047 45 46 48 I NC A GND l 2 1 l INC NC 1 49 50 01 NC N O T E S w e e p I n p u t f o r t h e C o n t r o l l e r o r I n t e r f a c e b o a r d s o n l y Ezj 4 9 A GND 4 4 4 3 NC 042 4 1 NC 4 0 3 9 A G N D l 38 3 7 RFGAIN 36 3 5 NC 3 4 3 3 NC 3 2 31 NC 3 0 29 D GND 2 6 2 7 NC 26 2 5 NC 2 4 2 3 NC 022 21 0 RR 020 19 16 18 1...

Page 224: ...F 4 6 45 5VF OPT R Li 4 4 4 3 fl5VF LHALT 0 4 2 4 0 t15VF O P T I O N IRO 4 0 3 9 L O P T I O 0 GND l 36 3 7 0 LOPT PROG OA15 36 3 5 LOPTION ID OA14 3 4 3 3 OA13 15VF 3 2 3 OA12 OAll 30 29 5VF OAIO 2 8 2 7 OA9 WR PROT 26 2 5 OAa OA7 2 4 2 3 D GND OA6 2 2 2 OA5 D G N D l 2 0 lg O A 4 OA3 16 1 7 0 D GND OA2 16 zj OAI D GND 14 13 OAO OD7 12 1 1 D GND OD6 10 9 OD5 D GND 8 7 OD4 OD3 6 5 D GND OD2 l 4 3...

Page 225: ...rite protect position jumper on pins 2 and 3 When the jumper is set to the WR ENA write enable position jumper on pins 1 and 2 an additional service cal data menu is displayed under CAL Figure 7 3 illustrates those areas of the service cal data menu that are available 7 6 General Troubleshooting ...

Page 226: ...SEL ADJ key and the associated menu apply to the HP6561E HP8563E only t BAND 1 MXR BLAS key applies to HP8561 E only m LO FREQ SAMPLER FREO SAMPLER HARMONIC FRAC N FREQ POSTSCLR RAW OSC FREQ sj 143e Figure 7 3 Service Cal Data Menu General Troubleshooting 7 7 ...

Page 227: ...am to read these errors over HP IB If the program returns an error code of 0 there are no errors 10 DIM Err cl281 20 OUTPUT 718 ERR f 30 ENTER 718 Err 40 PRINT Err 50 END a If there is no response over HP IB set an oscilloscope to the following settings Sweep time 2 ms div Amplitude scale 1 V div b The signals at A2J202 pin 3 and pin 14 should measure about 4 V p p If the levels are incorrect refe...

Page 228: ...le Chapter 13 Display Power Supply Section A7 SLODA Chapter 12 RF Section A8 low band mixer Chapter 12 RF Section A9 input attenuator Chapter 12 RF Section A10 RYTHM Chapter 12 RF Section All YTO Chapter 11 Synthesizer Section Al3 2nd converter Chapter 12 RF Section Al4 frequency control Chapter 11 Synthesizer Section Chapter 12 RF Section Al5 RF assembly Chapter 11 Synthesizer Section Chapter 12 ...

Page 229: ...r Some TAM functions have limitations when used on an HP 85623 These limitations are noted on the computer display The TAM measures voltages at key points in the circuitry and flags a failure whenever the voltage falls outside the limits The TAM locates the failure to a small functional area which can be examined manually Remember the following when using the TAM n Be sure the spectrum analyzer po...

Page 230: ...ll be displayed followed by three periods and then followed by the last 17 characters n If you wish to change the system mass storage file location use the up down arrow keys to point to System mass storage file location and press CHANGE ENTRY You will then be prompted to enter a new mass storage file location n If the polling address or the mass storage file location were changed press I UNNY NUT...

Page 231: ...62E The analyzer will not revert back to an HP 85623 until power is cycled but that is not yet necessary n Before exiting the TAM I F SW program press RESTORE DUT IDS Note The amount of free disk space for the system mass storage file location will decrease over time since a data file is created for each HP 85623 used with this program Once a repair is completed for a given HP 85623 its associated...

Page 232: ...e latest known revision board measure only voltages or exit In general most points will not change from one board revision to another so using the most current tests is still very useful However any failure should be verified using the manual troubleshooting procedures before doing a repair Inconsistent Results Many of the signals measured by the TAM are digitally controlled If inconsistent result...

Page 233: ...ower supply section because this section powers the TAM and provides the display of AFI results Controller Check The TAM performs a check sum of all ROMs RAMS and the EEROM The CPU is also checked since parts of the CPU could be nonfunctional while the TAM still operates These checks are very similar to those done by the spectrum analyzer at power on ADC lnterface Check The keyboard interface and ...

Page 234: ...g proper operation of phase frequency detectors and loop integrators w Static bias voltages w DAC output voltages If probing a connector for a check yields a FAIL indication select the desired check using either the knob or step keys and press Maze Info A description of the function checked with measured and expected voltages or currents is displayed with a list of additional areas to check These ...

Page 235: ...ixer at 5 GHz If no signal is present the TAM will use the 298 MHz SIG ID oscillator if present as is done in AFI Calibration Oscillator Troubleshooting Mode The cal osc troubleshooting mode enables front panel control of the cal oscillator on the A4 assembly The cal oscillator can be fixed tuned to three different frequencies The cal oscillator may also be set to one of four sweep widths centered...

Page 236: ...1 600 MHz Reference Loop 333 YTO Leveling Loop 334 Sampling Oscillator 335 10 MHz Reference 336 Fractional N PLL 337 YTO Loop Settling Errors 351 to 354 Sampling Oscillator 355 Span Accuracy Calibration Errors 356 to 361 Automatic IF Errors 400 to 599 System Errors 600 to 651 Digital and Checksum Errors 700 to 799 EEROM Checksum Errors 700 to 704 Program ROM Checksum Errors 705 to 710 RAM Check Er...

Page 237: ...e for information on programming the spectrum analyzer 100 NO PWRON Power on state is invalid default state is loaded Press SAVE PMR ON STATE to clear error message 101 NO STATE State to be RECALLed not valid or not SAVEd 106 ABORTED Current operation is aborted HP IB parser reset 107 HELLO No HP IB listener is present 108 TIME OUT Analyzer timed out when acting as controller 109 CtrlFail Analyzer...

Page 238: ...is not a valid argument for this command 136 FULL FULL is not a valid argument for this command 137 LAST LAST is not a valid argument for this command 138 GRT DSP GRT DSP are not valid arguments for this command 139 PLOTONLY Argument can only be used with PLOT command 140 PWRON PWRON is not a valid argument for this command 141 BAD ARG Argument can only be used with FDIAG command 142 BAD ARG Query...

Page 239: ... input is outside of ADC range Microprocessor not receiving interrupt from ADC LO and RF Hardware Firmware Failures 300 to 399 YTO Loop Errors 300 to 301 These errors often require troubleshooting the Al4 frequency control assembly synthesizer section or the ADC circuits 300 YTO UNLK YTO first LO phase locked loop is unlocked The ADC measures YTO ERR voltage under phase lock condition 301 YTO UNLK...

Page 240: ...nce The 10 MHz reference should measure greater than 7 dBm at A15J303 The ADC measures MAINSENSE at the beginning of each sweep and if the voltage is outside certain limits the main roller pretune DAC is adjusted to bring OFFSENSE within the proper range ERR 304 is set if this cannot be accomplished This error is not applicable to HP 8560 E Series spectrum analyzers If it occurs in an HP 8560 E Se...

Page 241: ...pplicable to HP 8560 E Series spectrum analyzers If it occurs in an HP 8560 E Series spectrum analyzer suspect a problem with the model number identification in the spectrum analyzer firmware Main roller pretune DAC set to 255 The main roller pretune DAC is set to 5 causing MAINSENSE to go to the positive rail The DAC is incremented until MAINSENSE changes polarity ERR 310 is set if the DAC is set...

Page 242: ...ks before attempting to troubleshoot span calibration problems because the loops must all lock in order to perform the calibration If LO spans greater than 1 MHz are correct check A14U114B A14U115A A14U116 or A14QlOl This error message appears when the roller span attenuator DAC is out of range This DAC value is recalculated each time there are changes to the span or start frequency ERR 315 is set...

Page 243: ...age is noted in a locked condition and the main roller is programmed to a frequency 400 kHz higher ERR 321 is set if the new MAINSENSE voltage is not greater than the previous MAINSENSE voltage This error is not applicable to HP 8560 E Series spectrum analyzers If it occurs in an HP 8560 E Series spectrum analyzer suspect a problem with the model number identification in the spectrum analyzer firm...

Page 244: ...8560 E Series spectrum analyzer suspect a problem with the model number identification in the spectrum analyzer firmware Roller fine adjust DAC sensitivity less than or equal to 0 During the LO adjust routine the fine adjust DAC is set to two different values and the MAINSENSE voltage is measured at each setting ERR 328 is set if the difference between these voltages is 0 or negative This is typic...

Page 245: ...If the YTO is working properly refer to LODA Drive under Al4 Frequency Control Assembly in Chapter 12 RF Section The LODA AGC voltage is monitored by the ADC ERR 334 is set if LODA AGC is outside of its prescribed limits Refer to LODA Drive under Al4 Frequency Control Assembly in Chapter 12 RF Section Sampling Oscillator 335 This error indicates an unlocked sampling oscillator also known as the of...

Page 246: ...e dead time of the main sweep ramp The firmware then detects any span accuracy calibration errors These errors only apply to firmware revisions 931216 and later 356 SPAC CAL 357 SPAC CAL 358 SPAC CAL 359 SPAC CAL Sweep data problem finding bucket 1 of the span accuracy calibration sweep This error indicates a possible failure of the sweep generator span attenuator or main FM coil sweep switches on...

Page 247: ...ce 300 kHz 1 MHz 100 kHz 30 kHz 10 kHz 3 kHz 1 kHz 300 Hz 100 Hz 30 Hz 10 Hz 3 Hz 1 Hz and 2 MHz The routine restarts from the beginning if a fault is detected Parameters adjusted after the routine begins but before the fault is detected are correct parameters adjusted later in the sequence are suspect Refer to Automatic IF Adjustment in Chapter 9 IF Section 400 AMPL C300 401 AMPL 300 402 AMPL 1K ...

Page 248: ...owing steps 1 Disconnect W30 white from A5J4 2 Connect W30 to the input of a second spectrum analyzer and set its controls as follows Center frequency 10 7 MHz Reference level 30 dBm 3 Observe the spectrum analyzer display while pressing FULL IF ADJ on the spectrum analyzer If a 35 dBm signal does not appear troubleshoot the cal oscillator on the A4 assembly 4 If a 35 dBm signal does appear troubl...

Page 249: ...st 3 kHz resolution bandwidth in third crystal pole Unable to adjust 3 kHz resolution bandwidth in fourth crystal pole Unable to adjust resolution bandwidths less than 300 Hz ADC handshake Unable to adjust 300 Hz resolution bandwidth ADC handshake Unable to adjust 1 kHz resolution bandwidth ADC handshake Unable to adjust 3 kHz resolution bandwidth ADC handshake Unable to adjust 10 kHz resolution b...

Page 250: ...second step gain stage Unable to adjust second step gain stage Unable to adjust third step gain stage Unable to adjust third step gain stage Unable to adjust third step gain stage Unable to adjust linear amplifier scale Unable to adjust step gain amplifiers Unable to adjust third step gain stage Unable to adjust step gain amplifiers Unable to adjust third step gain stage Unable to adjust 30 kHz re...

Page 251: ...oscillator 3 If a 10 MHz signal approximately 0 dBm is not present suspect the Al5 RF assembly the A21 OCXO or the Al5 assembly TCXO Option 103 If the 10 MHz reference is present continue with step 4 4 Reconnect W17 to A4J7 and monitor the tune voltage at A4J9 pin 3 with an oscilloscope 5 Press PRESET on the spectrum analyzer under test 6 If the voltage is either 15 Vdc or 15 Vdc the Cal Oscillato...

Page 252: ...ent gain during LC bandwidth calibration Unable to adjust resolution bandwidths less than 300 Hz Insufficient gain during crystal bandwidth calibration Unable to adjust 300 Hz resolution bandwidth Insufficient gain during crystal bandwidth calibration Unable to adjust 1 kHz resolution bandwidth Insufficient gain during crystal bandwidth calibration Unable to adjust 3 kHz resolution bandwidth Insuf...

Page 253: ...ble to do frequency count of CAL OSC using IF down converter when adjusting resolution bandwidths less than 300 Hz Unable to obtain adequate FM demod range to measure 500 Hz IF filter with resolution bandwidths less than 300 Hz Unable to auto range chirp signal while setting VCXO or doing flatness calibration with resolution bandwidths less than 300 Hz Unable to auto range CW CAL OSC signal to cou...

Page 254: ...og scale Possible problem in Log offset Log Expand stage Unable to adjust amplitude of log scale Possible problem in Log offset Log Expand stage Unable to adjust amplitude of log scale Possible problem in Log offset Log Expand stage Unable to adjust step gain amplifiers Unable to adjust amplitude of 1 MHz resolution bandwidth Unable to adjust amplitude of log scale Check video offset circuitry Una...

Page 255: ...g information on the A4 Cal Oscillator sweep generator If the 100 kHz resolution bandwidth works properly the cal oscillator sweep generator is failing to sweep its oscillator frequency at the correct rate The error is detected in sweeping on the skirts of the 100 kHz resolution bandwidth A properly operating sweep generator generates a series of negative going parabolas These parabolas generate t...

Page 256: ...ibration Fidelity offset unstable from DC logger calibration Fidelity gain error from DC logger calibration System Errors 600 to 651 600 SYSTEM 601 SYSTEM ADC timeout errors occur if the A2 controller assembly frequency counter is faulty Refer to Chapter 8 ADC Interface Section Hardware firmware interaction check other errors Hardware firmware interaction check other errors 650 OUTOF RG 651 NO IRQ...

Page 257: ...4 PRESELCT Checksum error of customer preselector peak data External preselector data recalled in internal mode or internal preselector data recalled in external mode To clear the error press X MBRE 1 OF 2 FACTORY PRSEL PK SAVE and SAVE PRSEL PK Program ROM Checksum Errors 705 to 710 The instrument power on diagnostics perform a checksum on each programmed ROM A2 controller assembly If an invalid ...

Page 258: ...stem RAM A2U304 Microprocessor Error 7 17 717 BAD UP Microprocessor not fully operational Refer to Chapter 10 Controller Section Battery Problem 718 If STATE or TRACE data is found to be corrupt the processor tests the display RAMS and the program RAMS containing the STATE information If the RAMS are working properly this error message is generated To check the BTl Battery and the battery backup c...

Page 259: ...rflow Check for other errors Hardware firmware interaction square root error Check for other errors Hardware firmware interaction triple overflow Check for other errors Hardware firmware interaction BCD overflow Check for other errors Unknown system error Hardware firmware interaction Code invoked for wrong instrument Fast ADC Error 760 This error applies only to spectrum analyzers with fast ADC O...

Page 260: ...e math or normalization on Unable to lock cal oscillator when set to external frequency reference Check that the external 10 MHz reference is within tolerance The oven controlled crystal oscillator OCXO oven is cold Unit is still performing IF calibrations or is in need of IF calibrations which were not yet done due to an OVENCOLD condition since an OVENCOLD error is indicative of a bandwidth 5 1 ...

Page 261: ... diagram located at the end of this chapter Assembly level block diagrams are located in Chapters 8 through 13 55754 HP 56 I 1 1oRvinM I I IRf SiKOi HPs56 7 I I I I L _ l i P O A4 Id s s 1 _____ ___ ____ _ y y R SECTlON I 1 15 I PHASE LOCKED LOOPS I f REFERENCE All IT0 I ocxo I I I SWEEP I GENERATOR I I Grp GiF 1 ISUPPLY SECTION sp169e Figure 7 4 Functional Sections 7 42 General Troubleshooting ...

Page 262: ...z fourth IF used only in the digital resolution bandwidths 5100 Hz Bands 1 and 2 use double conversion A third conversion is used for the digital resolution bandwidths lo0 Hz A10 YIG tuned filter mixer RYTHM down converts the RF input to a first IF of 310 7 MHz Although this IF passes through the Al3 second converter it bypasses the second mixer The second conversion on the Al5 RF assembly down co...

Page 263: ...75 GHz to greater than 40 MHz at 13 2 GHz The high band mixer is ac coupled It uses the first and second harmonics of the first local oscillator to cover the frequency range A PIN diode switch in A7 SLODA directs the first LO to the appropriate mixer The Al4 frequency control assembly provides PIN diode bias All YTO All is a YTO YIG tuned oscillator YIG yttrium iron garnet is a ferro magnetic mate...

Page 264: ...ess compensation amplifiers amplify the output of the double balanced mixer The amplifier variable gain 0 to 45 dB compensates for flatness variations within a band Band conversion loss is compensated by step gain amplifiers in the IF section Control for the amplifiers originates from two DACs on the A3 Interface assembly DAC values are interpolated approximately every 17 MHz based on data obtaine...

Page 265: ...Hz All YTO main coil 2 01 MHz to 20 0 MHz All YTO FM coil 100 Hz to 2 MHz Fractional N phase locked loop When the sweep ramp is applied to the YTO the spectrum analyzer must prevent this loop from trying to compensate for changes in the output frequency To accomplish this the spectrum analyzer opens the PLL by disconnecting the phase detector output of the YTO PLL Reference PLL part of A15 The 600...

Page 266: ... 300 MHz t R E F E R E N C E PLL 600 MHz A L 10 MHz ocxo spi13e Figure 7 5 Phase Lock Loops Fractional N PLL part of A14 The fractional N PLL produces an output of 60 MHz to 96 MHz This PLL output serves as the reference frequency for the YTO PLL A one to one relationship in frequency tracking exists between the fractional N PLL and the YTO A change of 1 MHz in the fractional N PLL will produce a ...

Page 267: ...ncy counter prescaler conditioner the AM FM demodulator and down conversion to 4 8 kHz for digital resolution bandwidths of 1 Hz through 100 Hz The cal oscillator which is part of A4 supplies the stimulus signal for automatic IF adjustments Normally the oscillator operates only during retrace for a few milliseconds to adjust part of the IF All IF parameters will be re adjusted approximately every ...

Page 268: ...s other signals such as PLL error voltages The fast ADC is used only to digitize video signals for sweep times 530 ms Main ADC part of A3 interface assembly For slower sweep times 130 ms the spectrum analyzer uses a successive approximation type of ADC The main ADC has a lo bit resolution but it is realized with la bit hardware The ADC algorithmic state machine ADC ASM controls the interface betwe...

Page 269: ... controller section includes the A2 controller assembly and A19 HP IB assembly The A2 assembly controls the Al7 CRT driver through W7 The battery on the rear panel provides battery backup for state and trace storage The A2 contains the CPU RAM ROM the display ASM and line generators CRT blanking focus intensity control HP IB interface frequency counter display RAM option module interface and EEROM...

Page 270: ...A6AlW2 supplies CRT cathode and filament voltages to the Al7 assembly The speed of the spectrum analyzer fan is variable A thermistor on A6 senses the temperature and adjusts the fan speed accordingly This allows the spectrum analyzer to run quietly in most room temperature environments and faster louder only when necessary Al7 CRT Display Driver The line generators on the A2 assembly drive the Al...

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Page 275: ...ffset Log Expand Video MUX Video Filter Video Filter Buffer Amplifier Positive Negative Peak Detectors Peak Detector Reset Rosenfell Detector ADC MUX Variable Gain Amplifier VGA Track and Hold A3 Assembly ADC Circuits ADC Control Signals ADC Start Stop Control ADC ASM ADC Ramp Counter A3 Assembly Control Circuits Analog Bus Drivers Analog Bus Timing Interface Strobe Select Al6 Assembly Fast ADC Ci...

Page 276: ...D RT PULSE HSCAN D GND RESERVED OFL ERR R T DAC3 A3J2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Dins A4J2 pins A5J2 pins A14J2 pins A15J2 pins 1 50 1 1 2 49 2 2 3 48 3 3 4 47 4 4 5 46 5 5 6 45 6 6 7 44 7 7 8 43 8 8 9 42 9 9 10 41 10 10 11 40 11 11 12 39 12 12 38 13 13 37 14 14 15 36 15 15 35 16 16 17 34 17 17 33 18 32 31 20 21 30 21 21 22 23 27 25 26 27 28 23 28 28 30 31...

Page 277: ...ND YTO ERR lOV REF A GND SCAN RAMP VIDEO TRIGGER A GND NC R T DAC2 R T DACl A3J2 pins 35 36 38 39 40 41 42 43 44 45 46 47 49 50 h4J2 pins 35 38 41 43 44 47 A5J2 pins 16 13 10 7 4 A14J2 pins 35 37 38 39 40 41 42 44 45 47 50 A15J2 pins 35 36 37 38 41 43 44 47 Indicates signal source ADC lntetface Section 6 3 ...

Page 278: ...ur during Automatic Fault Isolation result from either a shorted W2 control cable or faulty A3 assembly Perform the following steps to determine the cause of the error 1 Disconnect W2 from A3J2 and repeat the Automatic Fault Isolation procedure 2 If the analog data bus error is still present troubleshoot the A3 Interface assembly If the error disappears look for a short on W2 or another assembly c...

Page 279: ...lifier VGA Check Video Filter Check Video Filter Buffer Amplifier Check Video MUX Manual Procedure to Perform ADC ASM ADC MUX ADC Start Stop Control Automatic Fault Isolation in ihis chap2er Analog Bus Drivers Automatic Fault Isolation in this chapter Analog Bus Timing Interface Strobe Select Keyboard RPG Problems Positive Negative Peak Detectors steps 3 through 10 Peak Detector Reset Positive Neg...

Page 280: ...fset LOG Expand Video Filter Buffer Amp Video Peak Detectors ADC MUX Variable Gain Amplifier Track and Hold Measured Signal Lines MS1 MSl MS2 MSl MS3 MSl MS3 MS3 MS5 OS1 MS5 MS6 MS6 MS6 MS7 MS7 MS8 Revision Trigger ADC Start Stop Control Video Trigger DAC Real Time DAC l RF Gain DACs MS2 MS8 MS7 MS1 MS3 MS6 8 8 ADC lnterface Section ...

Page 281: ...E TRIG DISP 9 LKSCNS P E A K BW TRACE 8 SEARCH LKSCNS FREQ AUTO MKR 7 COUNT COUPLE LKSCN4 SWEEP SK1 SK2 SK3 LKSCN5 AUX MEAS USER CAL SGL CTRL SWP LKSNS4 LKSNS5 LKSNSG MHz kHz Hz 6 3 BK SP 5 4 SK4 COPY 2 1 SK5 FRE QUENCY 0 SK6 SPAN 3 Check that all inputs to NAND gate A3U607 LKSNS lines are high when no key is pressed If any input is low continue with the following a Disconnect AlAlWl from A3J602 a...

Page 282: ...ssing at only one point check for an open or short on AlAlWl and AlA2Wl If these cables are working properly AlA RPG is probably defective 5 Press LUNE to turn spectrum analyzer off and disconnect AlAlWl from A3J602 Jumper A3U608 pin 12 RPG COUNTl to U608 pin 14 5 Vdc Jumper U401 pin 2 RPG COUNTl to U511 pin 11 HDPKD CLK This provides a 7 8 kHz square wave to the RPG COUNT input of the RPG Interfa...

Page 283: ...deo trigger mode The trigger for Gated Video has two modes of operation level mode and edge mode In the edge mode positive edge or negative edge triggering can be selected Output 0 from pin 10 of A3U617 generates the gate delay and output 1 from pin 13 of A3U617 generates the gate length The duration of these two time intervals is set using front panel softkeys under the Z key The trigger input fo...

Page 284: ...r 10 If correct trigger pulses are present at the trigger MUX output A3U613 pin 7 but the instrument does not appear to be sweeping proceed as follows a Press 1 SWEEP and DLY SWP OH OFF DLY SWP 1 30 milliseconds until ON is underlined then b Using an oscilloscope check for activity at pins 1 and 3 of A3U615A c If there is activity at pin 1 but not at pin 3 of A3U615A suspect A3U616 or A3U617 d If ...

Page 285: ... probe used highlight CHANNEL 4 on set V div to 2 V and offset to 0 V F DISPLAY norm avg env highlight noxnr g Using a 1O l probe connected to channel 1 of the oscilloscope check for activity at pins 10 and 13 of A3U617 h If either pin or both show no activity check for activity at pin 21 LTIMER of A3U617 i If LTIMER is not active troubleshoot the Interface Strobe Select circuitry block K j If the...

Page 286: ...he DVM reading while changing the PRESELECTOR TUNE value from 0 to 255 The PRESELECTOR TUNE value is the R T DACl setting 5 Check that the DVM reading increases from 0 to approximately lO Vdc as R T DACl is set from 0 to 255 6 If the voltage does not change as described set the spectrum analyzer to single trigger mode and check the following a Check that A3U409B pin 18 is at 10 Vdc b Check for the...

Page 287: ...SS BAND 0 is displayed Press the Ir key until DATA 300 MHz is displayed Note the number directly below DATA 300 MHz this is the RF Gain DAC value Connect a positive DVM lead to A3J400 pin 13 and the negative DVM lead to A3TP4 Check that the DVM reading increases from near 0 Vdc to between 1 3 and L 9 Vdc as the RF Gain DAC setting is increased from 0 to 4095 If the DVM readings are incorrect press...

Page 288: ...t a TTL high or low troubleshoot the A3 trigger video gating circuits 7 Reconnect W26 to A3JlOl and W20 to A2J4 8 Remove the A3 assembly shield 9 If the video filters appear to be faulty refer to Video Filter in this chapter 10 If there appears to be a peak detector problem refer to Positive Negative Peak Detectors in this chapter 11 Connect the spectrum analyzer CAL OUTPUT to the INPUT 50R and se...

Page 289: ...level between 10 dBm and i 30 dBm If the voltage at A3TP8 is not the same as that at A3TP6 replace A3UllO 21 If the voltage at A3TP8 and A3TP6 are equal move the oscilloscope probe to A3TP7 22 Change the reference level from 10 dBm to 0 dBm The voltage change on A3TP7 should be between 630 mV and 770 mV If the voltage change is outside of these limits refer to Variable Gain Amplifier VGA in this c...

Page 290: ...in step 9 should be 5 f3 If the ratio is not 5 troubleshoot the A3 Interface assembly 11 Reconnect W26 to A3JlOl Video MUX Refer to function block U of A3 Interface Assembly Schematic Diagram in the HP 8560 E Series Spectrum Analyzer Component Level Information 1 Press ET and set the spectrum analyzer controls as follows Center frequency 300MHz Span OHz 2 Press mSWP CAL and IF DJ OFF Connect the C...

Page 291: ...z to 3 MHz video bandwidths Various series resistances and shunt capacitances switch into the video filter to change its cutoff frequency When sample detection is selected the effective video bandwidth is limited to approximately 450 kHz by the track and hold circuitry When Gated Video is selected the video signal is gated turned on periodically for a set duration of time This function is shown in...

Page 292: ...12 Pin 15 300 Hz H L L L L L 1 kHz L L L L L H 3 kHz L H L L L L 10 kHz L L L L H L 30 kHz H L H L L L 100 kHz L L H L L H 300 kHz L H H L L L 1 MHz L L H L H L 3 MHz L L L H L L Video Filter Buffer Amplifier Refer to function block W of A3 Interface Assembly Schematic Diagram in the HP 8560 E Series Spectrum Analyzer Component Level Information The video filter buffer amplifier provides outputs f...

Page 293: ...s in steps a through e below the positive and negative peak detectors are probably faulty Continue with step 3 to check the detectors a b C d The peak to peak deviation of the noise in NORMAL detector mode should be approximately two divisions Press TRACE TMCE B CLEAR WRITE 3 YIEU B TRACE 1 MORF 1 of 3 and DETECTOR MODES Select DESECTDR POS PEAK mode e Confirm that the noise is about one third div...

Page 294: ...onent Level Information 1 Press 1 on the spectrum analyzer and set the controls as follows Center frequency 300MHz Span OHz Sweep time 5 s Detector mode POS PEAK 2 Check that HHOLD A3U526 pin 11 has 18 ps wide pulses every 128 pus 3 Check that HODD U408 pin 5 is a square wave with a period of 16 7 ms 2 x sweep time 600 4 Check LPOS RST U422 pin 4 for 200 ns low going pulses every 128 ps 5 Check LN...

Page 295: ...loscope while reducing the video bandwidth from 1 MHz to 1 kHz 6 As the video bandwidth is decreased to 1 kHz the HROSENFELL line should increasingly show a low logic level With a video bandwidth of 1 kHz a nearly flat line should be displayed on the CRT 7 Set the sweep time to 50 ms Externally trigger the oscilloscope using the spectrum analyzer rear panel BLKG GATE OUTPUT 8 Check that HPOS HLDNG...

Page 296: ...r Section Table 8 9 Logic Levels at A3U108 Detector Mode U108 pin 1 U108 pin 15 U108 pin 16 SAMPLE H L H POS PEAK H L L NEG PEAK L L H 5 Set the spectrum analyzer to the following settings Span 5 MHz Sweep time 50ms 6 Check for the presence of the SCAN RAMP signal by connecting an oscilloscope probe to A3J2 pin 45 component side of A3J2 Connect the negative probe lead to A3TP4 7 A 0 to 10 V ramp s...

Page 297: ...2 removes dc offset to keep U113 in its monotonic range Both U112 and U113 are set to the same value The DAC settings cannot be changed from the front panel Track and Hold Refer to function block AC of A3 Interface Assembly Schematic Diagram in the HP 8560 E Series Spectrum Analyzer Component Level Information 1 Press PRESET on the spectrum analyzer and set the controls as follows Center frequency...

Page 298: ...gnals from the A2 controller assembly HBADC CLKO and HBBKT PULSE HBBKT PULSE is used only in zero span Use the following steps to verify the signals 1 Disconnect W22 from A2J8 2 If a 10 MHz TTL signal is absent on W22 refer to the 10 MHz Reference on the Al5 RF assembly troubleshooting procedure in Chapter 12 RF Section 3 Set the spectrum analyzer m to zero 4 Reconnect W22 5 With an oscilloscope p...

Page 299: ...TL high at A3U509 pin 2 and a TTL low at A3U509 pin 14 7 Press CAL and RF J N LO IF During the realignment A3U509 pin 2 should be TTL low and pin 14 should be TTL high until the 10 kHz and narrower resolution bandwidths are adjusted If correct the Start Stop Control circuitry is being selected properly by the processor and U508 in the ADC Register block is working properly 8 Press PRESET on the sp...

Page 300: ...A3U528 Upon the occurrence of HSTART ADC the SASM successively toggles bits from high to low starting with the most significant bit The digital result is then converted to an analog current in DAC U518 and compared with the SAMPLED VIDEO If the DAC current is too high the output of U512 will be low telling the SASM that the guess was high and that the bit just toggled should remain low It then mov...

Page 301: ...red to the digital ramp counter When the analog sweep ramp exceeds the DAC output generated for that ramp counter setting HRAMP COMP toggles high indicating the end of a bucket The ramp counter counts horizontal buckets There are 601 buckets per sweep so the ramp bucket counter counts from 0 to 600 The ramp counter is incremented by HRST PK ENA 1 Press GZi on the spectrum analyzer and set the cont...

Page 302: ...occur when toggling between 10 MHz 1NT and 10 MHz EXT Monitor U401 pin 5 LFCSTB with an oscilloscope or logic probe This is the strobe for the Al4 frequency control assembly Press AMPLITUDE and check that pulses occur when toggling between ATTEN settings of 10 and 20 dB Monitor U401 pin 7 LIF STB with an oscilloscope or logic probe This is the strobe for the A5 IF assembly Press 1 and check that p...

Page 303: ...14 provide a 2 ps delay between the time HANA BUS goes high and the enable line to demultiplexer A3U407 goes low 1 Press PRESET on the spectrum analyzer and set the controls as follows Center frequency 300 MHz Span lOOMHz 2 Check that A3U407 pin 1 goes low approximately 2 ps after HANA BUS A3U400 pin 3 goes high 3 If HANA BUS is absent check for pulses on ABT A3U505 pin 2 and IA10 A3U505 pin 5 4 I...

Page 304: ...es Spectrum Analyzer Component Level Information Interface strobe select generates the various strobes used by circuits on the A3 Interface Assembly Table 8 10 and Table 8 11 are the truth tables for demultiplexers A3U410 and A3U500 Table 8 10 Demultiple er A3U410 Truth Table Selected Output Line IA1 Pin 15 LSCAN KBD L Pin 14 LDACUl H Pin 13 LDACl L Pin 12 LDAC2 H Pin 11 LDACS L Pin 10 H Pin 9 LTI...

Page 305: ...ace on the Al6 assembly This digital ground plane is totally isolated from the chassis 1 Press PRESET on the Option 007 spectrum analyzer and set the controls as follows Centerfrequency 300 MHz Span OHz Reference level 10 dBm Log division 10 dB DIV Sweep time 20 ms 2 Connect the CAL OUTPUT to the INPUT 500 connector 3 Adjust the Option 007 spectrum analyzer reference level to place the signal at t...

Page 306: ...n the Al6 fast ADC assembly connect the ground or common lead to the ground plane trace on the Al6 assembly This digital ground plane is totally isolated from the chassis 1 Press PRESET on the Option 007 spectrum analyzer and set the controls as follows Center frequency 300 MHz Span OHz Reference level 20 dBm Log division 5 dB DIV Sweep time 20ms 2 Connect the CAL OUTPUT to the INPUT 500 connector...

Page 307: ...he sample rate is less than 12 MHz and the detection mode is peak or pit the SCLK 1 LPEAK P LO and P HI signals control the LP Q signal In these detection modes latch U30 stores the peak or pit value of the samples taken for each bucket The 8 bit digital magnitude comparator U31 compares the input byte P with the output byte Q from latch U30 When P is greater than Q P LO is low 0 and P HI is high ...

Page 308: ...by the two strobe lines MSB STRB and LSB STRB 16 bit word transfers occur as two sequential byte transfers the most significant byte first followed by the least significant byte The primary address ADDR3 low contains the 16 bit control word written by the firmware on the A2 controller assembly The secondary address ADDR3 high supports both 8 bit byte and 16 bit word reads and writes There is no re...

Page 309: ...ed in conjunction with bit 0 Bit 6 Bit 7 Bit 8 Bit 9 LLOADADDR LLOADPOST LVTRIG EN LREADCLK 1 Disables FADC memory for writes 0 Enables FADC memory for writes Enables load address counter 1 Writes to the address counter disabled 0 Writes to the address counter enabled Enables load post trigger counter 1 Writes to the post trigger counter disabled 0 Writes to the post trigger counter enabled Enable...

Page 310: ...ideo trigger level enabled Peak pit detection mode control Enables pit negative peak detection mode if LSAMPLE Bit 4 is also high Enables peak detection mode if LSAMPLE Bit 4 is high Reference Clock Refer to function block B of the Al6 fast ADC assembly schematic diagram in the HP 8560 E Series Spectrum Analyzer Component Level Information The reference clock circuitry takes the 8 MHz CMOS square ...

Page 311: ...address latches U27 and U28 block G and the post trigger counter U19 U20 U21 U22 and U47 begins counting Samples continue to be written to consecutive addresses in RAM U32 until the post trigger counter reaches its terminal count The CPU on the A2 controller assembly monitors the HSWP line and starts a software timer when HSWP goes high after being triggered The software timer is set to slightly l...

Page 312: ...24 U25 and U26 It counts upward from 0 to 32767 and then back to 0 in a circular fashion When a trigger occurs latches U27 and U28 latch the current static RAM address so that the CPU on the A2 controller assembly can later read the latches and determine the static RAM address of the sample that was taken when the trigger occurred The CPU loads the address counter during read mode by first setting...

Page 313: ...n IOB2 through IOB7 is latched into the P input top portion of U34 by the firmware on the A2 controller assembly when the fast ADC is in read mode When the sample on the Q input is higher than the video trigger level on the P input V HI output is high and V LO output is low When the Q input is lower than the P input V HI output is low and V LO output is high And when P is equal to Q both V HI and ...

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Page 315: ...5 P A N E L 0 M S 3 L J 3 6 M H z T T L OUT A N A L O G B U S VIDLO E N A B L E F R O M S H E E T 3 H 0 TP9 1 p T P 1 4 U VIDEO MUX 19 I I t I L L JlOJ M S 5 Q T P 1 7 2 0 C CLOCK AND S A M P L E R A T E GENERATOR A CPU I0 INTERFACE h AND CONTROL I 10 D T R I G G E R V I D E O I NPUT REG I STERS I L V iDE0 T R I G I L P2 P7 aI 1 3 7 e F I G U R E 8 3 F A S T A D C O P T I O N 0 0 7 B L O C K D I A...

Page 316: ...Assembly Log Amplifier Linear Amplifiers Video Offset Video Output Frequency Counter Prescaler Conditioner AM FM Demodulator 4 8 kHz IF Filters 10 7 MHz IF Filters 4 8 kHz and 10 7 MHz IF Filters 10 6952 MHz VCXO Input Switch LO Switch Synchronous Detector Limiter Isolation Amplifier Detector Mixer Log Offset Gain Compensation Log Offset Compensation Log Gain Compensation Video MUX A5 IF Assembly ...

Page 317: ...Inadequate CAL OSC AMPTD Range 300 Hz to 3 kHz Resolution Bandwidth Out of Specification Low Pass Filter Sweep Generator AM FM Demodulation Audio Amplifier and Speaker 9 2 IF Section ...

Page 318: ...ling the TAM for use with the HP 85623 spectrum analyzer When using Automatic Fault Isolation the TAM indicates suspected circuits that need to be manually checked Use Table 9 l to locate the manual procedure Table 9 2 lists assembly test connectors associated with each Manual Probe Troubleshooting test Figure 9 l illustrates the location of A4 and A5 test connectors Figure 9 2 illustrates the lev...

Page 319: ...sured in the limiter and a fault here indicates a broken limiter stage Signal path voltages are measured at the input after the video amplifier in the linear path after the offset and gain compensation circuits in the log path and after the video offset The cal oscillator on A4 is used as an input to the log amp for the purpose of measuring gains Faults in the signal path voltages indicate broken ...

Page 320: ...1 Osc ALC Test Zal Osc Sweep Gen Output Log Amp Input Switch Log Amp Limiter Bias ositive 15 V Supply Logamp Linear Output Logamp Linear MUX Path Logamp Log Output iogamp Compensation Jogamp Log MUX Path ogamp Video Offset 15 v Supply tevision st Step Gain Stage 1 st Step Gain Stage 2 st XTAL Pole Stage Ind XTAL Pole Stage st LC Pole Stage 1 st LC Pole Stage 2 Measured Signal Lines MS1 MS2 MS3 MSl...

Page 321: ...e Revision 4th XTAL Pole Stage Post Amplifier Stage 1 Post Amplifier Stage 3 3rd LC Pole Stage 4th LC Pole Stage FDAC Channels A FDAC Channels B FDAC Channels C IFDAC Channels D Latched IF Control Lines Negative 15 V Supply 5 v Supply 10 V Reference l Measured Simml Liner MSl MS2 MS3 MS2 MS3 MS4 MS3 MS4 MS5 MS4 MS5 MS6 MS5 MS6 MS7 MS6 MS7 MS8 MS8 MSl MS2 MS3 MS2 MS3 MS4 MS3 MS4 MS5 MS5 MS6 MS7 MS6...

Page 322: ...point channels through resistive networks One DAC from each of the quad DAC packages feeds into a network The TAM varies each DAC individually to isolate which ones failed Similarly 10 digitally controlled lines feed into a network and are monitored by the TAM The channels used to monitor the DACs are listed below Channel A A5J9 pin 1 MSl Channel B A5J9 pin 3 MS3 Channel C A5J9 pin 4 MS4 Channel D...

Page 323: ...r output A4U811 pin 9 is 100 kHz If it is not verify that the 10 MHz reference is present at A4U811 pin 1 b Verify that the frequency found on the output of the divider A4U808 pin 15 matches the output of the reference divider Matching frequencies indicate the oscillator loop is locked If the loop is not locked troubleshoot the divider oscillator or phase detector c Verify that the frequency found...

Page 324: ...e IF adjustments are made If STOP ALIGN is pressed the adjustment is halted n If REAXGI LO IF is selected All possible IF adjustments and LO adjustments are made with the most recent IF parameter variables used as the starting point w If FULL IF AD3 is selected All possible IF adjustments are made with the most recent IF parameter variables used as the starting point FULL IF ADJ is located in the ...

Page 325: ...e to maximum gain 4 Fine Attenuator for 32 evenly spaced DAC settings C Log Amplifier Slopes and Fidelity 1 Wideband RES BW 300 kHz through 2 MHz and Narrowband modes RES BW 300 Hz through 100 kHz 2 10 dB division and 2 dB division log expand modes D Linear Scale Gains On the log amplifier assembly P O A4 E Peak Detector Offsets both positive and negative peak detectors with respect to normal samp...

Page 326: ... Hz through 100 Hz if Option 103 A VCXO final LO tuned to align digital bandwidths with crystal bandwidth center frequency B Overall gain C Gain variation with input frequency Requirements For the Automatic IF Adjustment routine to work the spectrum analyzer must provide the following basic functions n Power supplies n Control signals n ADC n 10 MHz frequency reference to the A4 log amp Cal oscill...

Page 327: ... the spectrum analyzer press PRESET SPAN ZlXRO SPBN k 1 1 GHz 1 50 dBm 2 Press ICAL and IF AD3 OFF 3 Disconnect cable W27 coax 3 from A5J5 and connect cable W27 to the output of a signal generator 4 Set the signal generator controls as follows Amplitude i 10 dBm Frequency 10 7MHz 5 Simultaneously decrease the signal generator output and the spectrum analyzer REF LVL in 10 dB steps The signal displ...

Page 328: ... an active probe such as an HP 85024A and another spectrum analyzer If an HP 1120A active probe is being used with a spectrum analyzer having dc coupled inputs such as the HP 8566A B HP 8569A B and the HP 8562A B either set the active probe for an ac coupled output or use a dc blocking capacitor between the active probe and the spectrum analyzer input Failure to do this can result in damage to the...

Page 329: ...4U302 pins 1 and 7 while changing the HP 85623 spectrum analyzer resolution bandwidth from 100 kHz to 300 kHz b If the voltages do not come within a few volts of the 15 V and 15 V supplies U103 and U302 are suspect c Disconnect the digital multimeter and reconnect W27 to A4J3 Linear Amplifiers Refer to function block C of A4 Log Amplifier Schematic Diagram sheet 2 of 4 in the HP 8560 E Series Spec...

Page 330: ...ock P of A4 Log Amplifier Schematic Diagram sheet 3 of 4 in the HP 8560 E Series Spectrum Analyzer Component Level Information The circuit provides a programmable video offset with a step size of 5 mV from 300 mV to i 900 mV 1 On the HP 85623 spectrum analyzer press PRESET SPAN ZEND SPAN 1 1 m iZiiKZ 50 dBm CAL IF AD3 OFF 2 Disconnect W27 coax 3 from A4J3 and connect a signal generator to A4J3 3 S...

Page 331: ...ains and Video Offset in this chapter 10 Reconnect cable W54 to A4J4 Frequency Counter Prescaler Conditioner Refer to function block Q of A4 Log Amplifier Schematic Diagram sheet 4 of 4 in the HP 8560 E Series Spectrum Analyzer Component Level Information The frequency counter prescaler conditioner divides the frequency by two and then attenuates it The circuit consists of frequency divider U703A ...

Page 332: ...A B to 4 8 kHz center frequency and 2 kHz span Caution If a dc block is not used damage to the HP 8566A B results The HP 8566A B and many other spectrum analyzers have dc coupled inputs and cannot tolerate dc voltages on their inputs 5 Connect the VIDEO OUTPUT rear panel of the HP 85623 spectrum analyzer through a 20 dB attenuator and dc block to the input of the HP 8566A B Set the sweep time of t...

Page 333: ...a dc block is not used The HP 8566A B and many other spectrum analyzers have dc coupled inputs and cannot tolerate dc voltages on their inputs 6 Connect the VIDEO OUTPUT rear panel of the HP 85623 spectrum analyzer through a 20 dB attenuator and dc block to the input of the HP 8566A B Set the sweep time of the HP 8566A B to 10 seconds 7 Set the HP 8566A B to single trigger and press TRACE A CLEAR ...

Page 334: ...6952 MHz VCXO path Synchronous Detector A wide dynamic range linear detector is realized by the limiter block G the isolation amplifier block H the LO amplifier block I and the detector mixer block J The combination of these circuits form what is commonly known as a synchronous detector The input signal is split between two paths One path flows through the isolation amplifier and the other path fl...

Page 335: ...The isolation amplifier should have a gain of about 4 dB and also has a log narrow filter that is switched with the control line NARROWB Detector Mixer Refer to function block J of A4 Log Amplifier Schematic Diagram sheet 3 of 4 in the HP 8560 E Series Spectrum Analyzer Component Level Information Sum and difference frequencies are produced in the detector mixer The difference frequency produces v...

Page 336: ...from 300 Hz to 10 kHz The automatic IF adjustment sets the filter bandwidths and symmetry The step gain amplifiers consist of the first step gain stage second step gain stage and third step gain stage These amplifiers provide gain when the HP 85623 spectrum analyzer reference level is changed The amplifiers also provide gain range to compensate for variations in the IF filter gains which change wi...

Page 337: ...P 85623 spectrum analyzer power supply current limiting cannot protect the resistors in series with the power supply Note Some transistors have collectors connected to the case Electrical connection of the case to the collector might not be reliable making collector voltage measurements on the transistor case unreliable IF Signature 1 Disconnect W27 coax 3 from A5J5 2 Connect an SMB tee to A5J5 us...

Page 338: ...566A B controls as follows Sweep time 550ms dB division 5 dB Reference level 5 dBm b Press LF on the HP 8566A B and a very short time later press ADJ Cm IF STATE on HP 85623 spectrum analyzer Figure 9 4 through Figure 9 8 illustrate detailed IF signatures of a properly operating HP 85623 spectrum analyzer It may be necessary to experiment with different time intervals between initiating the sweep ...

Page 339: ...4 Detailed IF Adjust Signature 1 D e t a i l e d I f A d j u s t S i g n a t u r e 2 REF 5 0 dBm ATTEN 1 0 dB M k r 5 0 4 4 msec 3 0 8 0 dBm hP 5 dB SAMPLE I 3RD STEP GAIN STAGE I 1 2ND S T E P I GAIN STAGE 3RD STEP _ GA IN STAGE n SWeP T I AE 2 03 set llP 7 1 ZND S7 EP 2 N D S T E P GAIN STAGE I I I 15 d b REF ERENCE ATTENUATOR I I CENTER 1 0 7 0 0 0 0 0 MHz SPAN 0 Hz RES BW 300 kHz VBW 3 0 0 kHz...

Page 340: ...0 0 kHz VBW 3 0 0 kHz SWP 2 0 0 set Figure 9 6 Detailed IF Adjust Signature 3 D e t a i l e d I f A d j u s t S i g n a t u r e 4 5 0 dBm ATTEN 1 0 dB M K R 1 2 8 4 set t LOG OFYSETS C E N T E R 1 0 7 0 0 0061 M H z S P A N 0 H z R E S B W 3 0 0 kHz V B W 1 kHz S W P 1 4 0 sea Figure 9 7 Detailed IF Adjust Signature 4 IF Section 9 25 ...

Page 341: ...in stage the fine attenuator or the fourth LC pole output amplifier Region C of Figure 9 4 has no 15 dB step Suspect the reference 15 dB attenuator Region D of Figure 9 4 is flat Suspect the second step gain stage Entire signature noisy If the signature resembles Figure 9 9 suspect a broken first step gain stage or a break in the signal path in the input switch first crystal pole or second crystal...

Page 342: ...dBm 5 dB SAMPLE ATTEN 2 0 dB I I I I I I I I I I I S P A N 0 H z C E N T E R 1 0 7 0 0 0 0 0 tvIHZ R E S B W 3 0 0 kHz V B W 3 0 0 kHz S W P 5 0 0 set S K 1 7 9 V B W 3 0 0 kHz S P A N 0 H z SWP 5 0 0 set S K 1 7 8 Figure 9 9 Noisy Signature Figure 9 10 Noise with Correct Shape IF Section 9 27 ...

Page 343: ... 0 kHz V B W 3 0 0 kHz S W P 5 0 0 set Figure 9 11 Region B Amplitude Variation REF 1 0 0 dBm ATTEN 2 0 dB I I I I I I I I I 4 I 5 dB SAMPLE C E N T E R 1 0 7 0 0 0 0 0 MHz S P A N 0 H7 R E S B W 3 0 0 kHz V B W 3 0 0 kHz S W P 560 s e S K 1 8 0 SK181 Figure 9 12 Region B Amplitude Offset 9 28 IF Section ...

Page 344: ...ace flatness is not within 2 5 dB a failure probably exists 4 A trace similar to Figure 9 13 indicates a crystal short failure 5 Press SPAN to set the spectrum analyzer to 3 MHz A trace that slopes across the screen see Figure 9 14 indicates a failed LC pole To isoiate the broken pole refer to the shape factor information in 30 kHz Resolution Bandwidth Problems ATTEN 1 0 d B R L 0dBm lBdB C E N T ...

Page 345: ... four sections of Region E is consistently longer than the others the corresponding LC pole is faulty IF gain compression FET transistors Q301 Q303 Q700 and Q701 can deteriorate with age Measuring less than 0 volts on the FET source indicates a bad FET Bandwidth too wide Check for contamination on the printed circuit board Clean the board as required 3 kHz and 10 kHz Resolution Bandwidth Problems ...

Page 346: ... I of A5 IF filter schematic diagram sheets 1 of 3 and 2 of 3 in the HP 8560 E Series Spectrum Analyzer Component Level Information 1 On the HP 85623 spectrum analyzer press PRESET SPATJ ZIZRO SPAIN 1 and 10 2 Press LCAL and IF BDJ OFF 3 Disconnect W29 coax 7 from A5J3 and W27 coax 3 from A5J5 4 Inject a 5 dBm 10 7 MHz signal into A5J3 5 Monitor the output of A5J5 with another spectrum analyzer 6 ...

Page 347: ... instrument 10 MHz reference The reference divider function block U divides the reference and delivers a 100 kHz TTL signal to the phase detector function block V The divide by N circuitry function block Y divides the oscillator output of 9 9 MHz to 11 5 MHz by 99 to 115 resulting in a 100 kHz output to the phase detector When the cal oscillator PLL is locked narrow positive and negative of equal ...

Page 348: ...U807 pin 5 CALOSC OFF becomes TTL low 0 V at the start of a FULL IF ADJ press a and FULL IF ADJ The phase modulation output at A4U804 pin 8 should also remain at 0 volts If these checks are correct troubleshoot blocks V W X and Y See Figure 9 21 A4 log amplifier Cal oscillator Block Diagram Inadequate CAL OSC AMPTD Range Refer to function block AC of A4 Log Amplifier Schematic Diagram in the HP 85...

Page 349: ...from A4J8 3 Connect an SMB tee to A4J8 using a short coaxial cable with SMB connectors 4 Connect one output of the tee to cable W52 coax 9 5 Connect an HP 85024A active probe to the other output of the tee 6 Connect the output type N connector of the active probe to the input of the HP 8566A B spectrum analyzer 7 Connect the probe power cable to the HP 85623 spectrum analyzer front panel PROBE POW...

Page 350: ...e 9 18 illustrates normal operation Severe failures slope error greater than 30 percent and subtle 3 kHz resolution bandwidth errors less than 30 percent indicate a problem with A4U802 U803 U804 or U106 On the HP 85623 spectrum analyzer press FULL IF RDJ When the message IF ADJUST STATUS 300 Hz RBW appears press s on the HP 8566A B Figure 9 19 illustrates normal operation Severe failures slope err...

Page 351: ...RES BW 1 0 0 kHz VBW i0 kHz SWP 50 0 mssc Figure 9 17 Output Waveform 3 kHz Resolution Bandwidth O u t p u t Waveform i kHt R e s o l u t i o n B a n d w i d t h rp 1 de AEF 3 7 0 dBm ATTEN 10 dB CENTER L i I I I I I I I II II I I I I I I I 0 0 0 MHz SW i0 kHz VBW 1 kHt S P A N 0 H z SWP 200 mscc Figure 9 18 Output Waveform 1 kHz Resolution Bandwidth 9 36 IF Section ...

Page 352: ... 000 Mlit SPAN 0 Hz RES BW i0 kt lz VBW 1 kHz SWP 200 msec Figure 9 19 Output Waveform 300 Hz Resolution Bandwidth RE F 4 3 0 dBm ATTEN 1 0 dB 1 dB CENTER I I I I 1 0 7 1 0 0 0 0 MHz S P A N 0 Hz R E S B W 1 0 kHz VBW 1 kHz SWP 2 0 0 msec S K 1 8 9 Figure 9 20 Failed Crystal Set Symptoms IF Section 9 37 ...

Page 353: ...ting A4C802 and A4C801 the output is at 0 volts These switches open to start the sweep The output of A4U804A pin 1 is 0 35 V to 10 V depending on the sweep width selected by A4U802A and A4U803A This voltage appears across A4R801 Capacitor A4C801 integrates the current through A4R801 The output of A4U804B is a straight negative going ramp Capacitor A4C802 and resistor A4R802 integrate the output of...

Page 354: ...the volume and listen for the variation in speaker output level Clipping is normal at the highest volume levels 6 If the audio is not working correctly monitor the signal at A4U704 pin 3 with an oscilloscope The signal should be 20 mV peak to peak f25 percent with t2 5 V of dc bias If the signal measures outside these limits the fault is prior to the audio amplifier block T 7 If the signal is corr...

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Page 358: ... is operating properly Troubleshooting Using the TAM Blank Display Digital Signature Analysis DSA Display Problems Line Generators Blanking Display Jumbled or Trace Off Screen Intensity Bad Characters or Graticule Long Lines Dimmer Than Short Lines Analog Zero Span Problems Non Option 007 Frequency Count Marker Problems Frequency Counter State and Trace Storage Problems Keyboard Problems Controlle...

Page 359: ... line gen test Y line gen test Intensity offset output Revision X Y Z Output Offset X output amplifier Y output amplifier Blanking test Focus DAC test MS4 MS8 MS2 MS7 MS6 MS1 MS3 MS1 MS3 MS4 MS7 MS7 MS3 MS8 MS2 Use the following procedure if the instrument display is blank This procedure substitutes an HP IB printer for the display 1 Connect the printer to the spectrum analyzer and set the printer...

Page 360: ...3 A 2 CONTROLLER J201 J202 REVISION CONNECTOR Jll T A M T E S T CONNECTOR Figure 10 l A2 Test Connectors SP17 10 Move the probe cable to A2J201 press SOFT KEY I and wait 5 seconds 11 Press SOFT KEY t4 The results will be sent to the printer Follow the procedure in step 9 to obtain more information on any of the tests 12 If no failures were indicated in testing the A2 controller move the probe cabl...

Page 361: ...cy of the previous line 6 If step 4 reveals problems microprocessor A2Ul is probably faulty 7 Press LINE to turn the spectrum analyzer off Replace jumper A2El Move the DSA jumper from connecting E5 and E6 back to connecting E6 and E7 Display Problems Line Generators Refer to function blocks D and I of A2 controller schematic diagram sheet 1 of 4 in the HP 8560 E Series Spectrum Analyzer Component ...

Page 362: ...erator Output Waveforms Blanking Refer to function block J of A2 Controller Schematic Diagram sheet 1 of 4 in the HP 8560 E Series Spectrum Analyzer Component Level Information 1 Using an oscilloscope check for blanking pulses at A2J202 pin 15 A2U206 pin 6 should be at a TTL high Blanking pulses turn the CRT beam off during the sample time of the line generators and when moving the CRT beam to a n...

Page 363: ...divisions shows character mode VECTOR pulses 3 ps apart The BLANK pulses are synchronized to the VECTOR pulses by U214B The fourth trace shows the double pulses which delay the leading and trailing edges of the blanking pulses 6 Set the oscilloscope to the following settings to expand the first and fourth traces This displays how the rising edges of U213 13 determine the transitions of the blankin...

Page 364: ...aveforms look different from those illustrated in Figure 10 2 check the waveforms at the low pass filter input function block E in the component level information binder 3 The waveform at the low pass filter should look like X POS in Figure 10 2 but have an amplitude from 0 V to 5 V 4 If the waveform in step 3 is incorrect set an oscilloscope to the following settings Amplitude scale 10 V div Swee...

Page 365: ...R DAC while vertical distortions apply to the Y LINE GENERATOR DAC The DACS have current outputs so they are not readily observable with an oscilloscope Continue with step 8 to observe the DAC outputs 8 To break the effect of feedback in the line generators and to observe the output of the DACs short J201 pin 13 J201 pin 1 to TP3 GND to observe U201 pin 1 and TP2 U203 pin 1 and TPl Continue with s...

Page 366: ...operly working line generators Whenever there is a pulse on TP2 or TPl the appropriate integrator U201B or U203B generates a ramp the output vector which feeds back to U201A U203A and shows on its output 5 0 V div 0 0 0 v 1 0 0 m s d i v 0 0 0 0 s U201A 1 TP2 U203A 1 TPI SK195 Figure 10 6 Distorted X Y Line Generator Waveforms 5 0 V div 0 0 0 v 2 0 0 us div 0 0 0 0 s U201A 1 T P 2 U203A 1 TPI SK19...

Page 367: ... DISPLAY If the intensity does not change troubleshoot the intensity DAC A2U212A A2U212A is controlled from the front panel The amplitude of the waveform at U211A pin 1 should increase or decrease with intensity changes Clamp U211B limits the voltage to about 4 2 V Short A2J201 1 to ground and set the intensity DAC to a number greater than 80 A major portion of the waveform should be limited to 4 ...

Page 368: ... Short A2J201 pin 13 to ground A2TP3 2 Connect channel A of an oscilloscope to A2J201 pin 2 Connect channel B to A2U210D 14 3 Set an oscilloscope to the following settings Amplitude scale 10 V div Sweep time lms div Triggering External 4 Externally trigger the oscilloscope off the signal at A2U207 pin 8 LBRIGHT 5 The waveforms should look like those illustrated in Figure 10 9 If the waveform at J2...

Page 369: ...time lms div Triggering External 3 Externally trigger the oscilloscope off the signal at A2U207 pin 8 LBRIGHT 4 The display should be similar to Figure lo 11 except that the untriggered trace should show at the left edge of the screen In these settings DEFl causes switching between the line generators and the analog inputs sweep and video DEFl remains high when the CRT adjust pattern is on Refer t...

Page 370: ...s on the A4 log amplifier Cal oscillator or A2 controller assembly 1 Disconnect W53 from A2J7 2 Connect the output of a synthesized source such as an HP 3335A to A2J7 3 Set the synthesized source to the following settings Amplitude lO dBm Frequency 5 35MHz 4 Set the spectrum analyzer to the following settings Center frequency 300 MHz Span lMHz 5 On the spectrum analyzer press FREQ COUNT The freque...

Page 371: ...e for each setting of COUNTER RES The gate time is the period during which U511 pin 3 is high The FREQ COUNT input A2J7 is gated in U511B by HBKT PULSE The gated signal clocks divide by 16 counters U703A and U703B These counters are cascaded to form a divide by 256 counter The MSB of this counter CD7 clocks the CLKO input of U700 The frequency of CD7 is a function of COUNTER RES as shown in Table ...

Page 372: ...ems State storage is in the two of the four Program RAMS and trace storage is in the two display RAMS With low battery voltage it is normal for states and traces to be retained if the power is off for less than 1 minute If the power is left off for more than thirty minutes with low battery voltage the stored states and traces will be lost The following steps test battery backup 1 Measure the volta...

Page 373: ...f the display shows the analyzer to be in RMT and the ATTEN value displayed on the CRT changed according to the program the A2 controller assembly is working properly Refer to Chapter 8 ADC Interface Section 4 If there was no response over HP IB the A2 controller is probably defective Be sure to also check the A19 HP IB assembly and A19Wl 5 If there was an improper response for example the display...

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Page 375: ...Hz VCXO Third LO Driver Amplifier 100 MHz VCXO Unlocked Reference PLL 600 MHz SAWR Operation 600 MHz SAWR Troubleshooting 600 MHz SAWR Third LO Driver Amplifier 600 MHz SAWR Unlocked Offset Lock Loop Sampling Oscillator Operation Troubleshooting Unlocked YTO PLL Operation Troubleshooting an Unlocked YTO PLL Unlocked Fractional N PLL Operation Confirming an Unlocked Condition Fractional N PLL Frequ...

Page 376: ... the active probe for an ac coupled output or use a dc blocking capacitor HP 11240B between the active probe and the spectrum analyzer input Some spectrum analyzers can be set to ac coupled Failure to do this can result in damage to the analyzer or the probe Troubleshooting Using the TAM Refer to Chapter 7 General Troubleshooting for information on enabling the TAM for use with the HP 85623 Spectr...

Page 377: ...I CONNECTOR JIOI A15d2Jl J400 sp128e Figure 11 l Al4 and Al5 Test Connectors PIN 2 l l PIN 16 PIN 1 n 0 0 SP114E Figure 11 2 TAM Connector Pin Locations Table 1 l l Measured Signal Line Location Measured Signal Line MSLl MSL2 MSL3 MSL4 MSL5 GND MSL6 MSL7 MSL8 Connector Pin pin 1 pin 2 pin 3 pin 4 pin 5 pin 6 pin 13 pin 14 pin 15 Synthesizer Section 1 l 3 ...

Page 378: ...main coil tune DAC Check main coil coarse and fine DACs Manual Procedure to Perform Confirming a Faulty Synthesizer Section steps 12 33 Confirming a Faulty Synthesizer Section steps 9 11 Unlocked YTO PLL steps 9 12 Unlocked YTO PLL steps 13 17 Third LO Driver Amplifier steps l 6 Unlocked Reference PLL steps d 13 Unlocked Reference PLL steps 12 and 13 Confirming a Faulty Synthesizer Section steps 1...

Page 379: ... Check the 600 MHz reference loop amplifier Check the YTO loop Check YTO FM coil driver Check YTO FM coil driver and main loop error voltage driver First LO Span Problems 52 MHz step 8 Unlocked Reference PLL steps 17 22 Unlocked Offset PLL steps 3 7 14 f9 Unlocked YTO PLL steps 18 21 Unlocked YTO PLL steps 22 26 Sampler and Sampler IF steps l 15 First LO Span Problems All Spans steps 6 13 Sweep Ge...

Page 380: ...in coil DACs output Main loop error volt DVR Option drive Option drive switch Option drive DAC lo V reference LODA drive Main coil tune DAC Second converter PIN switch Second converter mixer bias Second converter drain bias Second converter doubler bias Second converter driver bias First mixer drive switch First mixer drive DAC R e v i s i o n Fractional N out Divided reference Feedback buffer bia...

Page 381: ... loop buffer C Sampler bias test Positive 15 volt supply Third LO tune voltage Offset lock loop buffer 600 MHz oscillator bias Calibrator AGC amp bias Calibrator amp1 adj 3rd LO driver amp Positive 15 volt supply Flatness compensation 3 Flatness compensation 2 Flatness compensation 1 SIG ID collector bias RF gain control test Revision External mixer switch signal ID switch Ten volt reference Exter...

Page 382: ...frequency will be displayed as a negative number Confirming a Faulty Synthesizer Section The All YTO the spectrum analyzer first LO is a YIG tuned oscillator which tunes from 2 95 to 6 8107 GHz The A7 switched LO distribution amplifier SLODA levels the output of All and distributes the signal to the A8 low band mixer A10 YIG tuned mixer filter RYTHM A15UlOO sampler and the front panel 1ST LO OUTPU...

Page 383: ... the A3 assembly ADC MUX Table 11 4 Center Frequency Tuning Values HP 85623 sampling Center Frequency MHz Oscillator Frequency MHz 2156 3 285 000 2176 3 286 364 2199 5 287 500 2230 3 288 462 799 3 288 889 2263 3 290 000 2282 3 290 909 2302 3 291 667 2155 3 292 500 2158 3 293 478 2336 3 294 444 2196 3 295 000 1 3 296 000 2378 3 296 471 2410 3 297 000 2422 3 297 222 Check A14J301 10 MHz reference in...

Page 384: ... output power is between 9 and 13 dBm f Set jumper A14J23 to the NORM position and reconnect the All YTO Check Al4 frequency control assembly steps 12 18 12 On the spectrum analyzer press c 1 m ZERO SPAhi CAL MORE i OF 2 frREg DTACNOSE and FRBC hl FRE Note the fractional N oscillator frequency Ignore the minus sign if present Fractional N Oscillator Frequency MHz 13 Check A14J304 FRAC N TEST port ...

Page 385: ...onnect W34 from A15UlOOJl and disconnect W32 from A15JlOl 20 Connect a frequency counter to A15JlOl Connect a high frequency test cable from an HP 8340A B synthesized sweeper to A15UlOOJl See Figure 11 4 21 Connect a BNC cable from the spectrum analyzer 10 MHz REF IN OUT to the HP 8340A B FREQUENCY STANDARD EXT input 22 Set the HP 8340A B to the following settings Frequency standard EXT Powerlevel...

Page 386: ...34 to A15UlOOJl and W32 to A15JlOl 27 The First LO OUTPUT located on the front panel must be terminated in 50 ohms If the YTO unlocks only with certain center frequency and span combinations check that the termination is in place 28 Set the spectrum analyzer C3MTEE FREq and SPAN to generate the unlock conditions 29 On the spectrum analyzer press SGLSWP 30 Move jumper A14J23 to the TEST position 31...

Page 387: ...63 118 2410 3 297 000 84 000 2422 3 297 222 91 333 General PLL Troubleshooting The synthesizer section relies heavily on phase locked loops PLL Typically a faulty PLL is either locked at the wrong frequency or unlocked The information below applies to troubleshooting these two classes of problems on a generalized PLL PLL Locked at Wrong Frequency Numbers in the following text identify items in Fig...

Page 388: ...PRETUNE r 1 I DOWN I h t I REF Y 1 1 REFERENCE INPUT UP ALTERNATE I sp129e Figure 11 5 PLL Locked at Wrong Frequency 11 14 Synthesizer Section ...

Page 389: ...ce PLL A155502 pin 3 LO3 ERR Sampler PLL A15J200 pin 13 OFL ERR 1 Fractional N PLL 1 A14TP13 INTEGRATOR 1 UP 2 PRETUNE OUTPUT REF DOWN L _ spl30e Figure 11 6 Unlocked PLL 2 If the integrator output voltage changes in the manner described in step 1 the problem is external to the PLL For example the reference frequency could be faulty If the integrator output voltage appears incorrect confirm that t...

Page 390: ...er circuitry Refer to function block S of the Al5 RF schematic 3 If the tripler output is too low probe the output of A15U700 RF amplifier The level should be i 16 5 dBm f2 dB The level at the input of A15U700 should be i 8 5 dBm f2 dB 4 If the level at the input of A15U700 is too low suspect a faulty 100 MHz VCXO Refer to function block Q of the Al5 RF schematic 5 On the spectrum analyzer press C...

Page 391: ...mately 10 MHz TTL signal is present at U502 pin 11 with 60 percent duty cycle and the RF portion of the phase lock loop is functioning the fault probably lies in the phase frequency detector or the 100 MHz lock loop integrator Check phase frequency detector steps 17 22 17 18 19 20 21 Monitor U504 pin 5 and U503 pin 9 with an oscilloscope These are the two outputs of the phase frequency detector Re...

Page 392: ... Note The 300 MHz CAL OUTPUT signal comes from the tripled 100 MHz which is passed through a leveling loop The 300 MHz signal passes through a low pass filter for reducing higher harmonics These harmonics can fool the detector The 300 MHz signal passes through a variable attenuator controlled by PIN diode CR503 which is controlled by the feedback loop Diode CR504 is the detector diode the same typ...

Page 393: ...uble balanced mixer Check level at amplifier input steps 1 6 1 Press mCTRL_ INTERNAL MIXER Press SIG ID OFF if Option 008 is installed 2 Use an active probe spectrum analyzer combination to confirm the power level of the 300 MHz signal at the following test points A15X602 pin 5 7 dBm A15TP504 15 dBm 3 If the signal at A15X602 pin 5 is low but the signal at A15TP504 is correct press mCTRL INTEENAL ...

Page 394: ... into the phase frequency divide chain is Refer to function block AN on the RF schematic Troubleshooting Check loop references steps 1 and 2 1 Use an active probe and spectrum analyzer to confirm the presence of the following reference to the offset lock loop input A15TP404 300 MHz at 5 dBm 2 If this signal is not correct refer to Unlocked Reference PLL in this chapter Check levels into mixer step...

Page 395: ...2336 3 9 6 5 556 295 000 2196 3 10 6 5 000 296 000 1 3 15 5 4 000 296 471 2378 3 17 5 3 529 297 000 2410 3 20 5 3 000 297 222 2422 3 18 6 2 778 To set the sampling oscillator to a desired frequency set span to 0 Hz and CENTER FREQ to the value listed in the table 1 10 Measure the 296 MHz loop feedback signal at the following test point A15TP400 2 dBm 11 If the feedback signal is not near the indic...

Page 396: ...U406 pin 11 19 Connect a short across A15R425 Connect A15U406 pins 3 and 11 together This puts the same signal on both the phase frequency detector inputs 20 Observe the phase frequency detector outputs U406 pins 6 and 9 with an oscilloscope Narrow TTL pulses should be present Pin 9 is normally low pulsing high and pin 6 is normally high pulsing low 21 Check the end of L417 nearest C445 with an os...

Page 397: ...carried along as a bookkeeping function which determines which way to sweep the fractional N oscillator up or down and what polarity the YTO error voltage should have positive or negative to maintain lock To check if a negative sampler IF is selected press a MORE 1 OF 2 FEEQ DIAGNOSE FRAC N FREQ If the fractional N oscillator frequency is positive the sampler IF is also positive A negative fractio...

Page 398: ... frequency to a higher frequency Table 11 7 summarizes the amplifier polarities for the various combinations of sampler IF polarities and LO spans The YTO main coil filter is used to improve residual FM in FM spans See function block I of Al4 frequency control schematic in the Component Level Information binder Transistors Q304 and Q305 switch the filter capacitor C36 and resistor R48 into the cir...

Page 399: ...analyzer press CAL MORE i OF 2 FREB DTBCBISE and LO FREI The displayed LO FREQ is the desired YTO frequency calculated Record the calculated frequency of the YTO below YTO Frequency calculated MHz 4 Measure the YTO frequency at the front panel First LO OUTPUT jack and record below YTO Frequency measured MHz r Al4 FREQUENCY CONTROL ASSEMBLY 1 I1 I MAIN COIL TUNING TUNING DAC J17 2 I I 9 TO 17 U207 ...

Page 400: ...A14J304 The frequency should be equal to the frequency recorded in step 6 If not refer to Unlocked Fractional N PLL in this chapter b Measure the input and output levels of the A15UlOO sampler If the sampler appears defective check the LO drive to the sampler as described in Sampler and Sampler IF c Refer to steps 34 through 51 below Check First LO pretune frequency and amplitude steps 9 12 9 The ...

Page 401: ...A7 SLODA steps 18 21 18 Set jumper A14J23 to the TEST position and set the spectrum analyzer to the following settings Center frequency 2 9 GHz Span OHz 19 Disconnect cable W34 from A15UlOOJl 20 Use a power meter to measure the A7 SLODA sampler drive output at the end of W34 The power should measure greater than 9 dBm 21 Place jumper A14J23 in the NORMAL position and reconnect W34 to A15UlOOJl Che...

Page 402: ...ain of either 1 5 or 15 the analyzer firmware controls the gain during the locking process The error voltage is read by the ADC on the A3 interface assembly U324D calibrates out any offsets from true ground A14U326A inverts the sense of the YTO loop to lock the YTO on lower sampler sidebands YTO frequency sampler frequency x sampler harmonic The fractional N frequency indicated in the FREQ DIAGNOS...

Page 403: ... Span OHz Trigger Single EXT with no external trigger connected 43 Press SAVE PWR flN STATE and turn off the spectrum analyzer 44 Place jumper A14J23 in the TEST position and turn on the spectrum analyzer Check main coil tune DAC steps 4549 45 Verify the voltages listed in Table 11 9 Table 11 9 Main Coil Coarse and Fine DACs Voltages Measurement Points Voltages A14J17 pin 2 5 Vdc A14J17 pin 3 5 Vd...

Page 404: ... V The voltage may also be determined from the following equation V first LO Frequency 2 95 GHz x 2 654 V GHz 51 The voltage at A14U330 pin 2 should measure 3 4 V f0 2 Vdc This represents a current setting the YTO to approximately 2 95 GHz 52 Return jumper A14J23 to the NORMAL position 1 l 30 Synthesizer Section ...

Page 405: ...n OHz 2 Connect A14J304 FRAC N TEST to the input of a synthesized spectrum analyzer and view the fractional N PLL output at 66 7 MHz Note If a synthesized spectrum analyzer is not available connect A145304 to the input of a 20 dB gain amplifier such as an HP 84473 Connect the output of the amplifier to the input of a frequency counter 3 If the fractional N oscillator measures a stable 66 7 MHz the...

Page 406: ... set to a value for the start frequency and a sweep rate It then sweeps for as long as HSCAN is high Use the following procedure to troubleshoot unlocked loop problems or problems of locking to the wrong frequency by less than 1 MHz 1 Check the two LEDs on Al4 frequency control assembly If either LED is lit the fractional N phase locked loop is not locked 2 The 10 MHz reference is required for fra...

Page 407: ...e voltage at R240 to about fll V If the integrator its output voltage is on TP13 tries to produce a voltage outside this range excess current is shunted through CR131 and Q131 for positive excursions or CR132 and Q132 for negative excursions The bases of these transistors should be at about f9 6 V for proper operation 8 VCO troubleshooting Check the dc biases in the VCO function block The bias vol...

Page 408: ...UNES 2V TO lOV FOR 813 TO 1000 MHz 0 AT VOLTAGE CONTROLLED OSCILLATOR INSIDE INNER SHEILO WALL I 15 FN L 1 6V TN80 neci grounds at this point only I 249 I 19 6 I 0161 I mop I I I I I 3dBm 813 to 1 OOOMHz ...

Page 409: ... given by f f A14TP5 x 80 MHz RAW OSC FREQ where f A14TP5 is the frequency measured at TP5 and RAW OSC FREQ comes from step 4 If the frequency is in error the fractional divider block AS is not functioning Check that FRAC N RUN on U113 pin 39 is high e Use an oscilloscope to verify that the signals at N in U112 pin 8 and N out TP6 are identical except for a sub microsecond delay 11 Detector and in...

Page 410: ...xing Refer to Table 11 13 for a listing of sweep signal destinations versus first LO spans Sweeping the fractional N oscillator results in sweeping the YTO FM coil There is a one to one relationship between the fractional N oscillator frequency span and the span of the first LO The fractional N oscillator sweep is generated digitally The oscillator is always synthesized rather than employing lock ...

Page 411: ...ures a On the spectrum analyzer press CAL EEALTGN LO Ik IF and retest all spans b If the YTO adjustment has sufficient range and only LO spans of 2 01 MHz or above are faulty test YTO linearity by performing step c c Test the span in question at different center frequencies in the same band If the span accuracy changes significantly 2 or more suspect the All YTO 2 If only first LO spans of 2 MHz o...

Page 412: ...loop is locked and then opened while the sweep ramp is summed into the FM coil The FM coil sensitivity is corrected by changing the sensitivity of the FM coil driver 1 Perform the YTO Adjustment procedure in Chapter 2 Adjustment Procedures If the YTO adjustments cannot be performed continue with this procedure 2 Set the spectrum analyzer to the following settings Center frequency 300MHz Span 20MHz...

Page 413: ...ep e press ILINE to turn spectrum analyzer off and disconnect WlO from A14J3 Place a jumper between A14J3 pins 9 and 10 Place a 50 St 3 watt resistor across A14J3 pins 5 and 6 resistor HP part number 0811 1086 Press LINEI to turn spectrum analyzer on On the spectrum analyzer press E STAm STATE 0 If the voltage at U332 pin 2 is correct with A14J3 pins 9 and 10 shorted but was incorrect with WlO con...

Page 414: ...oscope A 0 V to 10 V ramp should be present 8 Change the spectrum analyzer span to 1 MHz and check for a 0 V to 5 V ramp at U323 pin 6 9 Change the spectrum analyzer span to 400 kHz and check for a 0 V to 2 V ramp at U323 pin 6 10 Set the spectrum analyzer to the following settings Start frequency lO MHz Stopfrequency 2 9GHz Sweep time 80ms 11 Monitor A14J15 pin 14 for a 0 V to 7 5 V ramp Switches...

Page 415: ...ators Switch Switch Switch Comparator Comparator U312B U312C U312D U319A Pin 1 U319B Pin 7 Open Open Closed High High Open Open Open High High Closed Closed Open High High First LO Span Problems Multiband Sweeps During multiband sweeps the sweep ramp at A14J15 pin 15 should go from 0 V to lO V for each band or portions of a band covered See function block A of Al4 frequency control schematic in th...

Page 416: ... i j i I i i j i i i i i i i i I i i in Figure 11 9 HP 6562E Sweep and Scan Ramps 11 42 Synthesizer Section ...

Page 417: ... N PLL Offset lock loop or YTO loop YTO Phase Noise in Locked versus Unlocked Spans Input a signal to the spectrum analyzer Set the center frequency to the input signal frequency set the span to 2 MHz and plot the display This plots the system noise for a locked sweep Plot the display again with a span of 2 01 MHz lock and roll sweep The crossover point of the noise floor of the two plots is typic...

Page 418: ...s on A14 particularly the regulator in the reference divider circuitry A14U121 Refer to function block AN on the Al4 frequency control assembly schematic The noise level of the voltage regulator should be l mV The typical noise level is 40 PV RMS between 10 Hz and 100 kHz A coaxial probe with very little unshielded tip area should be used to avoid picking up radiated 60 Hz Check that your measurem...

Page 419: ...l at approximately 0 dBm should be displayed on the other spectrum analyzer 6 Use an active probe spectrum analyzer combination to measure the signal at the following test points A15TPlOl 66 7 MHz 8 dBm A15TP201 296 MHz 9 dBm 7 If a correct signal is seen at A15TP201 but the signal at A15TPlOl is wrong proceed as follows Use an oscilloscope to measure the signals at the following test points A15J4...

Page 420: ...trolled with an 8 bit latch and the control signal HSCAN The latch U308 controls the sweep rate HSCAN determines when to reset the scan ramp and when to let it sweep Operation of the 50 ms to 2 000 second range will be described using a 50 ms sweep time as the example For a 50 ms sweep time Ql shorts out C16 The D to A converter U307 has zero output current U334A is a buffer with zero offset becau...

Page 421: ...DIST AMPLIFIER I I 1 I I m I J 5 1 4 5 T O 1 8 5 dE m __ 1ST LO OUT TO FRONT PANEL J2 13 TO 16 dBn LOW BAND MIXER OUT TO A8 J3 13 TO 16 d n HIGH BAND MIXER OUT TO A10 J 4 9 T O 2 d n 3 T O 6 8 GHz SAMPLER OUT TO A15 I w34 BLACK W32 RAY VIOLET JlO WHEN LOCKED SAME AS FRACTIONAL N FREO 10 MHz APPROX OdaTl 4 J30 w37 GRAY GREEN 6 0 0 MHz APPROX 0 dh T O A l 3 SECOND CONVERTER J305 4w49 I O q I D E L E...

Page 422: ...L 1 1YTO LOOP i III I f III I I I t II I POSTSCALER l J304 FRAC N TEST 1 0 dBm L J GENERATOR 1406 6 TO 500 MHz I 800 TO 1020 MHz I 16 17 20 21 F r a c t i o n a l N D i v i d e I I f I I I I I I I I _ __ J sp135e Figure 1 l l 1 Simplified Al4 Assembly Block Diagram 11 48 Synthesizer Section ...

Page 423: ...EVELS I OSCILLATOR CALIBRATOR AGC AMP SRD LO DRIVER MIXER TP40 1 2 TO 6 d r 2 0 M H z OFFSET PLL 5 lD 15 MHz TTL ioo MHz PLL J7Dl 600 MHz 2ND L O DRIVE 0 dh 10 MHz FROM A21 o c x o J303 1 0 M H z REFl T O A l 4 0 dh J304 10 MHz REF2 T O A 4 0 db J302 10 MHz FREO COUNT T O A 2 0 d n SI 1 2 2 e Figure 11 12 Simplified A15 Assembly Block Diagram Synthesizer Section 11 49 ...

Page 424: ...cessary after OCXO replacement and is generally not recommended If adjustment is necessary the spectrum analyzer must be on continuously for a minimum of 24 hours immediately prior to oscillator adjustment to allow both the temperature and frequency of the oscillator to stabilize Failure to allow sufficient stabilization time could result in oscillator misadjustment Check operation of the A21 OCXO...

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Page 427: ...and Mixer A9 Input Attenuator Al3 Second Converter Al4 Frequency Control Assembly LODA Drive Control Latch for Band Switch Driver YTF Driver Circuit Al5 RF Assembly Confirming a Faulty Third Converter Confirming Third Converter Output Third Converter Flatness Compensation Control Control Latches SIG ID Oscillator Option 008 10 MHz Reference Caution All of the RF assemblies are extremely sensitive ...

Page 428: ...r to the probe Troubleshooting Using the TAM Refer to Chapter 7 General Troubleshooting for information on enabling the TAM for use with the HP 85623 Spectrum Analyzer When using Automatic Fault Isolation the TAM indicates suspected circuits that need to be manually checked Use Table 12 l to locate the manual procedure Table 12 2 lists assembly test connectors associated with each Manual Probe Tro...

Page 429: ...n SIG ID Oscillator Opt 008 Check Second Converter Control Check SIG ID Oscillator Opt 008 Check SIG ID Oscillator Operation Opt 008 Check Third Converter Manual Procedure to Perform Third Converter Third Converter Third Converter Calibrator Amplitude Adjustment in Chapter 2 A7 SLODA Switched LO Distribution Amplifier A8 Low Band Mixer A9 Input Attenuator Al3 Second Converter Al3 Second Converter ...

Page 430: ...p MSl MS8 A15J602 SIG ID Collector Bias MS7 RF Gain Control Test MSl MS3 A15J901 Revision MS3 External Mixer Switch MSl MS8 Signal ID Switch MS5 MS6 External Mixer Bias MS7 Low Band Problems 1 Disconnect all inputs from the front panel INPUT 50R connector 2 Set the HP 85623 to the following settings Center frequency 0 Hz Span lMHz Input attenuator 0 dB 3 The LO feedthrough amplitude observed on th...

Page 431: ...tude Adjustment procedure in Chapter 2 Adjustment Procedures If this adjustment cannot be completed perform the steps located in Third Converter in this chapter 3 Perform the First LO OUTPUT Amplitude performance test Refer to the HP 8560 E Series Spectrum Analyzer Calibration Guide or use TAM functional test 4 If the performance test fails perform the LO Distribution Amplifier Adjustment located ...

Page 432: ...ther the A7 or A14JlO Note Err 334 may be displayed if the LO OUTPUT connector on the front panel is not properly terminated into a 50R termination 0 0 0 0 0 0 l l3 2 0 0 l 0 0 d4 srr632e Figure 12 2 A14J10 Solder Side of Al4 Ignore Pin Numbers on Mating Connector 1 Press LINE to turn the spectrum analyzer off Disconnect W12 from A14JlO 2 Connect a jumper between A14JlO pin 5 and A14J19 pin 6 Conn...

Page 433: ...e spectrum analyzer on 14 If the DVM reading changes significantly the A7 is probably defective A8 Low Band Mixer 1 Connect the HP 85623 CAL OUTPUT to the INPUT 500 connector 2 Set the HP 85623 as follows Center frequency 300 MHz Span OHz Input attenuation 10 dB 3 Check to see that A8 is receiving the 5 V and 4 V supply voltages from Al4 via W12 4 Using another spectrum analyzer check for approxim...

Page 434: ...rcuitry It will be necessary to use the DATA keys to enter an input attenuator setting of 0 dB the step key will not allow selecting 0 dB input attenuation 5 Monitor the pins of A14U420 with a logic probe or DVM while setting the input attenuator to the values listed in Table 12 3 6 If one or more logic levels listed in the tables is incorrect disconnect Wll from A14J6 and repeat step 4 checking o...

Page 435: ...low low low high low high low high low high low high high low high low high low high low low high low low low high low high low Al3 Second Converter Caution The Al3 assembly is extremely sensitive to Electrostatic Discharge ESD For further information regarding electrostatic cautions refer to Electrostatic Discharge in Chapter 1 General Information 1 Connect the HP 85623 CAL OUTPUT to the INPUT 50...

Page 436: ...fault is probably on the Al5 RF assembly 14 Reconnect W33 to A13J4 15 Connect the positive lead of a DVM to A14J19 pin 15 and the negative lead to A14J19 pin 6 16 If the DVM does not measure between t14 0 Vdc and i 15 0 Vdc perform the following a Press LINE to turn spectrum analyzer off and disconnect W13 from A14J12 b Press m to turn spectrum analyzer on and set the spectrum analyzer to the foll...

Page 437: ...e output voltage of A14U429B at A14J18 pin 14 item 2 of Figure 12 3 should be above 0 V If the output power is high the voltage should be more negative than 10 V If the voltages do not measure as indicated check that the voltages at A14J18 pins 5 and 13 item 4 are consistent with the operational amplifier output Note If a TAM is available use Manual Probe Troubleshooting to make measurements on A1...

Page 438: ...e Figure 12 3 A7 First LO Distribution Amplifier Drive Control Latch for Band Switch Driver Refer to function block P on Al4 Frequency Control Schematic Diagram sheet 3 of 5 in the HP 8560 E Series Spectrum Analyzer Component Level Information 1 Connect the positive lead of a DVM to A14U417 pin 14 and the negative lead to A14J18 pin 6 2 Set the HP 85623 to the following settings Center frequency 3...

Page 439: ...ed harmonic of the YTO frequency and the center frequency In low band switch U415A is closed to account for the 3 9107 GHz first IF offset between the YTO frequency and the center frequency This signal is 0 5 V GHz of tuned frequency and is available at the rear panel 1 On the HP 85623 press PRESET and set the controls to the following settings Start frequency 0 Hz Stop frequency 13 2 GHz 2 On the...

Page 440: ...HP 8582E Signal at A14J15 Pin 1 9 Check the voltage at A14J15 pin 3 with the spectrum analyzer center frequency set to the frequencies listed in Table 12 4 The following table lists the voltage that should be measured at A14J15 pin 3 the settings for the three switches U416 in function block Q and the gain through the Sweep Tune Multiplier 12 14 RF Section ...

Page 441: ...nd PBBZL OFFSET 13 Connect a DVM to A14J16 pin 13 14 Set the DAC to values from 0 to 255 to yield DVM readings from 0 V to 10 V respectively 15 Move the jumper on A14J14 from the NORM to the OPT position 16 Connect the DVM to A14J16 pin 1 17 Press PEESEL SLOPE 18 Set the DAC to values from 0 to 255 to yield DVM readings from 0 V to lO V respectively 19 Move the jumper on A14J14 from the OPT to the...

Page 442: ...0 7MHz CW Power 28dBm 7 If a flat line is displayed within 2 dB of the reference level and the performance test passed troubleshoot microcircuits A7 A8 A9 and A13 8 If a flat line is displayed within 2 dB of the reference level and the performance test failed troubleshoot the Al5 RF assembly 9 Disconnect the signal generator from A15J801 and reconnect W35 Confirming Third Converter Output 1 Connec...

Page 443: ...istribution function block A diode CR802 should be forward biased and diode CR801 should be reverse biased 3 Disconnect W35 coax 92 and connect a signal source to A15J801 Set the source to the following settings Frequency 310 7MHz Amplitude 30 dBm Caution For troubleshooting it is recommended that you use an active probe such as an HP 85024A and another spectrum analyzer If an HP 1120A active prob...

Page 444: ...ach attenuator section should be close to 0 mA Caution As long as the flatness data just entered is not stored the previously stored flatness data will be present after the power is cycled 14 Move the A2 controller assembly WR PROT WR ENA jumper to the WR PROT position 15 Reconnect the cable to A15J801 Flatness Compensation Control Refer to function block G on Al5 RF Section Schematic Diagram shee...

Page 445: ...g part of the retrace period and a TTL low during the sweep about 50 ms SIG ID Oscillator Option 008 Refer to function block F on Al5 RF Section Schematic Diagram sheet 4 of 4 in the HP 8560 E Series Spectrum Analyzer Component Level Information SIG ID is available only with Option 008 The SIG ID Oscillator provides a shifted third LO approximately 298 MHz to distinguish true signals from false si...

Page 446: ...d U303D In INTernal frequency reference U304D controls the outputs of these three NAND gates and the output of U304B is held high Check the 10 MHz reference by performing the following steps 1 Set the HP 85623 10 MHz reference to internal by pressing mCTRL REAR PANEL and 10 MHz INT 2 Use a spectrum analyzer to confirm the presence of a 10 MHz signal at the following test points A15J303 L lO dBm A1...

Page 447: ...03 10 If the signal at U304 pin 13 is correct see Figure 12 7 but there is a problem with the signals at A15J301 A155302 A155303 or A15J304 suspect U303 or U304 in the 10 MHz Distribution circuitry hp running 250 000 ns 250 000 ns o ooooo s o ooooo s 50 0 ns div 50 0 ns div 250 000 ns 250 000 ns 200 set 0 000 mV div 000 v 1 dc 1 f 40 00 mV Figure 12 6 10 MHz Reference at A15J302 RF Section 12 21 ...

Page 448: ...Ref et enci at L1 504 Pin 13 i 1 00 V div ioffset 2 000 V 1 o o l dc i p i i f i I I I i i i i fl i i I 250 000 ns 0 00000 s 50 0 ns div 250 000 ns 1 f 2 640 V Figure 12 7 10 MHz TTL Reference at U304 Pin 13 12 22 RF Section ...

Page 449: ...V SIG ID OFF 8V SIG ID ON PIN SW PIN Diode Switch Control SYTF or RYTHM LO Band HI Band PIN DIODE SWITCH PIN Diode Switch Control For 2ND Conv IF Output MIXER BIAS Detected Voltage on 2ND Converter Mixer Diode RFGAIN Voltage to Control Gain of Flatness Comp Amps RFGAINl and RFGAIN2 Currents to Drive PIN Diodes in Flatness Comp Amps LlOdB A L40dB B LSOdBC LDC D Control Lines to Set Attenuator Secti...

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Page 451: ...cord from the instrument before servicing these assemblies Failure to follow this precaution can represent a shock hazard which may result in personal injury n The voltage potential at A6AlW3 is 9 kV If the cable must be disconnected always disconnect it at the CRT with caution Failure to properly discharge A6AlW3 may result in severe electrical shock to personnel and damage to the instrument See ...

Page 452: ...OWER SUPPLY INDICATOR LEDS 42 ONTROLLER 1 2 6 Q Q w7 i28 CRT 1 5 4 A6AlW2 15 Q 5v C R T D R I V E R GENERATORS POWER SUPPLY A S S E M B L Y 1 2 6 b t28 B 110 220 i 1 5 m V O L T A G E f15 0 SE L E C fiR O N R E A R P A N E L 5 D 71 _ 5 15v __I 15v 11ov HV SHUTDOWN j CSV HV ON i ii HIGH VOLTAGE j MODULE 2 45KV I 2 55KV A6AlW3 A18Vl C R T sl133e Figure 13 l Simplified Section Block Diagram 13 2 Disp...

Page 453: ... 5 46 5 5 5 6 6 45 6 6 6 9 10 12 13 14 15 16 17 18 19 20 21 23 23 28 24 24 27 25 25 26 26 26 25 27 27 24 28 28 23 29 29 22 30 30 21 31 31 20 32 32 19 33 33 18 34 34 17 35 35 16 36 36 15 37 37 14 38 38 13 A4Jl A5Jl A6Jl 414Jl 415Jl pins pins pins Pins Pins 9 42 9 9 10 9 12 39 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 12 12 14 37 15 36 16 35 17 34 18 33 19 32 1...

Page 454: ...r control circuitry Dead power supply steps 11 21 Check high voltage supplies High voltage supplies Check input rectifier Dead power supply steps 6 7 Check intensity adjustments Intensity problems steps l 4 Check kick start bias circuitry Dead power supply steps 8 10 Check low voltage supplies Low voltage supplies Troubleshooting Using the TAM Refer to Chapter 7 General Troubleshooting for informa...

Page 455: ...or test MS6 Y line generator test MS1 Intensity offset output MS8 Revision MS1 X Y Z output offset MS3 MS4 MS7 X output amplifier MS7 Y output amplifier MS3 Blanking test MS4 Focus DAC test MS2 SK1121 Blank Display Using the TAM Use the following procedure if your spectrum analyzer has a blank display This procedure substitutes an HP IB printer for the display 1 Connect the printer to the spectrum...

Page 456: ... 12 If no failures were indicated in testing the A2 controller move the probe cable to A17J4 13 Press SOFT KEY i and wait 5 seconds 14 Press SOFT KEY 4 The results will be sent to the printer 15 If no failure is indicated in the printout check the high voltage supplies as described in High Voltage Supplies in this chapter Blank Display 1 If the LED above the front panel LINE switch is lit most of ...

Page 457: ...r or the Al7 CRT driver 9 If a flash does not occur on the display the A2 controller A6Al HV module Al7 CRT driver or A18Vl CRT might be at fault Blanking Signal 1 Connect an oscilloscope probe to A2J202 pin 3 Connect the oscilloscope ground lead to TP3 Set the oscilloscope to the following settings Sweep time 2 ms div Vertical scale 1 V div 2 If a 4 Vp p signal is not observed the A2 controller a...

Page 458: ...cable connections might be at fault 4 Perform the 16 MHz PLL Adjustment in Chapter 2 Adjustment Procedures If the 16 MHz CPU clock is off frequency the display will be distorted 5 Perform the Display Adjustment in Chapter 2 Adjustment Procedures Isolate the problem to either the X or Y axis by noting the behavior of the adjustments If the line generator or fast zero span portion of the adjustment ...

Page 459: ...ront panel adjustment press DISPLAY MORE i OF 2 FOCUS and turn knob have very little effect on focus If the focus of some areas of the screen are worse than normal continue with step 11 If no part of the screen can be brought to sharp focus continue with step 6 CRTs have some normal focus variation across their face Turn off the analyzer and place Al7 in the service position Connect the ground lea...

Page 460: ...roperly If A17Rll CUTOFF does not function properly place the Al7 CRT driver in the service position 5 Verify that blanking pulses are present at A17TP2 using an oscilloscope The pulses should be normal TTL levels approximately 1 ps wide and 4 or 7 ps apart If the blanking pulses are not correct check the BLANKING output of the A2 controller assembly and cable W7 6 If blanking pulses are present c...

Page 461: ...ions and achieve proper intensity 8 If the grid and cathode voltages are correct turn off the spectrum analyzer and check CR10 with an ohmmeter If CR10 is good suspect the A18Vl CRT 9 If the grid and cathode voltages are too low turn off the power and disconnect W8 from the base of A18Vl CRT and recheck the grid and cathode voltages 10 If the grid and cathode voltages are still too low refer to CR...

Page 462: ...rd from the instrument before servicing these assemblies Failure to follow this precaution can present a shock hazard which may result in personal injury n The voltage potential at A6AlW3 is 9 kV If the cable must be disconnected always disconnect it at the CRT with caution1 Failure to properly discharge A6AlW3 may result in severe electrical shock to personnel and damage to the instrument See pro...

Page 463: ...e buck regulator control circuitry 5 Connect a jumper from the dc power supply 12 Vdc output to the positive end of C207 nearest C209 6 Connect a jumper from i 12 Vdc output to the end of A6R202 physically nearest A6U211 7 If the current draw exceeds approximately 50 mA suspect a short in the buck regulator control circuitry or a shorted CR201 or a shorted U207 Shorted components may be hot 8 Chec...

Page 464: ...nds Kick Start See function blocks G D I and L of A6 power supply schematic diagram in the component level information binder If there is a short on the power supply or on one of the other assemblies the power supply will attempt to kick start Every 1 5 seconds the supply will attempt to start but will be shut down by a fault condition The kick start and its bias circuits provide power for the con...

Page 465: ... A6A2 regulator board that is part of the A6 power supply assembly The control circuitry can be checked as follows 1 The voltage at E302 should be 6 8 V 2 If not check for a triangle wave on the regulator board at TP31 or a 35 V peak to peak square wave at CR305 pin 3 3 If these signals are not present check the VBUCK signal for a voltage of about 110 V and check Q103 and Q104 for proper switching...

Page 466: ...11 If the TP403 waveform has pulses similar to those on TP402 the A6 power supply is probably faulty CRT Supply Dropping Out See function block K of A6 power supply schematic diagram in the component level information binder The CRT supply is a separate switching supply which provides the llO Vdc for the Al7 CRT driver from a winding on the A6Al HV module The CRT supply operates at approximately 3...

Page 467: ... This makes the loop gain independent of input line voltage and cancels 120 Hz ripple by more than 10 dB U202D and its associated circuitry permit the power supply to start up at low line voltages at low temperatures At low line voltages U202D will draw charge away from C206 through R205 This allows the buck regulator to turn on and draw current through the thermistors in the input rectifier This ...

Page 468: ... tells the microprocessor that the supplies are up and stable PWR UP will go high when the 5 Vdc supply exceeds t4 99 Vdc PWR UP will go low when this voltage drops below i 4 895 Vdc Once PWR UP is set low it will stay low for at least 50 ms before going high even if the 5 Vdc supply exceeds t4 99 Vdc before 50 ms have elapsed 13 18 Display Power Supply Section ...

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Page 471: ...chematic diagram Each CLIP has an HP part number which is changed whenever the HP part number for its related instrument assembly is changed Updated or replacement CLIPS may be ordered through your local Hewlett Packard Sales or Service Office using the CLIP part number provided in Table A l A complete set of the latest version of CLIPS can be ordered using HP part number 5960 6550 Note CLIPS may ...

Page 472: ...ower Supply 3611A and above 08564 60008t 08564 90004 A6A2 Regulator Board 3611A through 3743A 08564 60009 0856490006 3745A and above 08564 60026 0856490006 Al4 Frequency Control 3611A through 3632A 3711A and above 08563 60090 0856390152 08563 60120t 08563 90178 Al5 RF Board Option 103 with SIG ID 3611A through 3632A 3635A through 3720A 3724A and above 08563 60085 08563 90128 08563 60092 08563 9016...

Page 473: ...hrough 3720A 3724A and above Assembly Part Number 08563 600853 08563 60092 0856360106tt CLIP Part Number 08563 90128 08563 90163 08563 90173 3611A to 3632A 08563 60086 08563 90129 3635A through 3720A 08563 90093 08563 90164 3724A and above 08563 60107t 08563 90174 3611A through 3632A 08563 60084 08563 90127 3635A through 3720A 08563 60091 08563 90162 3724A and above 08563 60105t 08563 90172 Denote...

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Page 475: ...oval 4 15 replacement 4 16 A4 cal oscillator See cal oscillator A4 linear amplifier failures 9 14 A4 log amplifier troubleshooting 9 13 A5 IF assembly problems 9 21 A5 IF section See IF section A6 power supply removal 4 21 replacement 4 22 A7 first LO distribution amplifier removal and replacement 4 30 A8 low band mixer removal and replacement 4 31 A9 input attenuator removal and replacement 4 32 ...

Page 476: ...r sensors 3 6 serial number query 3 8 verifying HP IB 3 8 automated frequency response adjustment menus test menu 3 8 automatic fault isolation 7 14 See also AFI automatic IF adjustment 9 9 automatic IF adjustment parameters 9 10 B Bl fan removal and replacement 4 42 battery caution 4 43 removal and replacement 4 43 warning 4 43 blank display 7 13 10 2 13 6 blank display using the TAM 13 5 blankin...

Page 477: ...36 automatic IF error messages 400 to 599 7 28 battery error message 718 7 39 cal unlock error message 499 7 32 digital and checksum errors 7 37 EEROM checksum error messages 700 to 704 7 37 elimination 7 18 fractional N PLL error message 337 7 26 frequency response adjustment software 3 16 microprocessor error message 717 7 39 model number error message 719 7 39 option modules 7 40 programmed ROM...

Page 478: ...controllers 3 2 conditions menu 3 6 controller setup 3 4 error messages 3 16 19 HP IB cables 3 4 loading the program 3 5 mass storage file 3 7 3 9 numeric error messages 3 18 operating system software 3 2 required test equipment 3 3 sensor data file 3 9 sensor file deletion 3 10 sensor file edits 3 10 sensor serial number 3 9 sensor utilities menu 3 9 10 test descriptions 3 14 15 test record heade...

Page 479: ... 3 12 loading frequency response adjustment software 3 5 local oscillator See LO LO control check 7 15 LODA removal and replacement 4 30 troubleshooting 12 6 LO distribution amplifier 7 43 11 23 removal and replacement 4 30 LO distribution amplifier troubleshooting 12 6 log amplifier adjustments 2 30 detector mixer troubleshooting 9 20 failures 9 13 input switch troubleshooting 9 19 isolation ampl...

Page 480: ...te file 3 12 list files 3 12 system file 3 12 view edit 3 12 power supply 13 12 block diagram 13 19 cover 4 47 CRT 13 16 dead 13 12 high voltage 13 15 low voltage 13 15 removal 4 21 replacement 4 22 restarting 13 14 section 7 51 troubleshooting 7 14 turn on 13 18 power supply adjustment high voltage 2 13 power supply warning 13 1 prescaler 11 21 preselector peaking 8 12 probe power socket 13 7 pro...

Page 481: ... MHz 11 38 20 MHz 11 38 52 MHz 11 39 span accuracy problems 11 36 span problems 11 37 11 40 multiband sweeps 11 41 speaker troubleshooting 9 38 state storage problems lo 15 step gains troubleshooting 9 31 Store Conds softkey 3 12 sweep generator 1 l 46 sweep generator troubleshooting 9 38 sweeping 7 46 span accuracy 11 36 YTO 11 24 sweep ramp 11 42 switching LO distribution amplifier 11 23 adjustm...

Page 482: ...eo offset troubleshooting 9 15 View Edit softkey 3 12 voltage tuned oscillator 1 l 33 W Wl power cable connections 13 2 W3 line switch cable removal 4 48 replacement 4 52 warmup time frequency response adjustment software 3 3 wire assembly cables 5 7 write protect enable jumper 7 6 Y YIG tuned filter mixer 7 44 removal and replacement 4 34 YIG tuned filter mixer adjustment 2 60 YIG tuned oscillato...

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