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Service

Keysight 8480 Series Operating and Service Manual

FET Balance Adjustment

The FET balance adjustment should be performed if the wires connecting J1 (the

sensor cable connector) to A2 (the power sensor board assembly) have been

moved. If you have replaced A2 assembly or moved the wires during

troubleshooting you need to perform this adjustment.

Equipment Required

– Oscilloscope
– BNC cables (2 required)
– Power meter (modified as described in

Appendix A

)

Test Description

This test applies to both thermocouple and diode power sensors. Among the

required equipment is a modified E4418B Power Meter. The High Gain output of

the power meter is connected to Channel 1 of an oscilloscope, and the Chop

Output (220Hz square wave) of the power meter is connected to the oscilloscope

trigger - the High Gain output is the amplified version of the Power Sensor

chopped signal. Ideally, when no RF power is applied to the power sensor, the

High Gain output signal displayed on the oscilloscope is a straight line. If there is

a sensor offset, the offset signal is visible on the oscilloscope as a square wave

(chopped signal). Also, a switching transient (spike) usually occurs at the edge of

the chopped signal, due to the switching of the FET in the Power Sensor. Sensor

offset and spike balance are affected by the relative positions of the wires

connected to pins G and H of connector J1. One wire is black and white; the other

is brown and white. Moving the black and white wire adjusts the amplitude of the

switching transient (spike). Moving the brown and white wire changes the offset.

Once positioned, care must be taken not to displace these wires. To correctly

position these wires, perform the “FET Balance Procedure” on page 66.

NOTE

You do not need to perform a FET balance adjustment after an A1 bulkhead

assembly replacement, if the wires between J1 and A2 have not been disturbed.

Содержание 8480 Series

Страница 1: ...Keysight 8480 Series Coaxial Power Sensors Operating and Service Manual...

Страница 2: ...se rights customarily provided to the public to use modify reproduce release per form display or disclose commercial computer software or commercial com puter software documentation No additional gove...

Страница 3: ...t not limited to the implied warranties of merchantability and fitness for a particular purpose Keysight Technologies shall not be liable for errors contained herein or for incidental or consequential...

Страница 4: ...nd pressure emission at the operator position 70 dB A Sound Pressure Lp 70 dB A At Operator Position Normal Operation According to ISO 7779 1988 EN 27779 1991 Type Test Hersteller bescheinigung Diese...

Страница 5: ...s www keysight com find powersensors product specific information and support software and documentation updates www keysight com find assist worldwide contact information for repair and service The C...

Страница 6: ...6 Keysight 8480 Series Operating and Service Manual THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK...

Страница 7: ...ption 14 Dimensions 17 8480 series B models information 17 8480 series Options 18 Recommended Calibration Interval 21 8480 Series Power Sensor Specifications 23 Supplemental Characteristics 30 Install...

Страница 8: ...e 59 Troubleshooting power sensors 60 A1 Bulkhead thermocouple sensors 60 Repair 63 A1 Bulkhead Assembly 63 A2 Power Sensor Board Assembly 64 FET Balance Adjustment 65 Equipment Required 65 Test Descr...

Страница 9: ...onnection 45 Figure 2 3 Power linearity performance verification equipment setup 47 Figure 2 4 Illustrated major parts breakdown 51 Figure 3 1 Schematic diagram 58 Figure 3 2 Example of an acceptable...

Страница 10: ...h a permanent marker and adhesive labels 81 Figure B 1 8481A and 8481B 90 Figure B 2 8481A Option 001 91 Figure B 3 8482A and 8482B 92 Figure B 4 8481D 93 Figure B 5 8481H and 8482H 94 Figure B 6 8483...

Страница 11: ...Table 1 8 High sensitivity sensors 100 pW to 10 W 70 dBm to 20 dBm 29 Table 1 9 Cal factor to dB conversion chart 37 Table 2 1 Power sensor SWR and reflection coefficient 42 Table 2 2 Bulkhead assemb...

Страница 12: ...12 Keysight 8480 Series Operating and Service Manual THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK...

Страница 13: ...eneral Information 14 8480 Series Power Sensor Specifications 23 Installation 34 Operation 35 This Operating and Service Manual contains information about initial inspection performance tests adjustme...

Страница 14: ...e prefix are a code identifying the date of a major design change incorporated in your power sensor The four digit suffix is a sequential number and coupled with the prefix provides a unique identific...

Страница 15: ...iode power sensing elements are used Both types of power sensing elements have a maximum 50 dB dynamic range Thermocouple sensors have a square law region from 30 dBm to 20 dBm and with an attenuator...

Страница 16: ...hopper sampling gate and an AC coupled low noise amplifier The dc voltage is routed on gold wires to the chopper circuit which converts the low level dc voltage to an ac voltage To do this the chopper...

Страница 17: ...on is referred to as the power sensor Table 1 1 8480 Series power sensor dimensions including the RF connector 8480 series power sensor models Dimensions A models 8481A 8482A and 8483A 38 mm wide 30 m...

Страница 18: ...st be taken into consideration when calibrating the power meter and sensor The REF CAL FACTOR on the power sensor label has been adjusted for the impedance mismatch This REF CAL FACTOR when used to ca...

Страница 19: ...ensor the 1 mW 50 MHz Power Reference supplied by the power meter must be reduced to 1 W The reference attenuator provides the means to do this CAUTION Remove the mechanical adapter from the power sen...

Страница 20: ...ded with the power sensors Figure 1 4 shows the parts included with your power sensor Figure 1 4 8485A 8485A 033 8485D 8485D 033 sensor accessories NOTE The 11708A 30 dB attenuator is intended for use...

Страница 21: ...adapter 2 4mm f to Type N m is included with the power sensors shown in Figure 1 5 Figure 1 5 8487A power sensor with adapter Recommended Calibration Interval Keysight Technologies recommends a one ye...

Страница 22: ...this manual Power sensors are warranted only when they are operated within their specifications especially the maximum power handling capability Any power sensor returned to Keysight Technologies und...

Страница 23: ...ters Table 1 3 Typical measurement uncertainties of Calibration Factor CF data printed on the power sensor Frequency 25 C 3 C 8481A 8482A 8483A 8485A 100 kHz to 10 MHz 0 87 1 59 10 MHz to 30 MHz 0 81...

Страница 24: ...to 500 MHz 1 38 1 48 1 51 0 88 0 92 1 33 1 24 0 81 500 MHz to 1 2 GHz 1 34 1 48 1 48 0 87 0 88 1 35 1 26 0 81 1 2 GHz to 6 GHz 1 41 1 54 1 53 0 98 0 95 1 41 1 35 0 97 6 GHz to 14 GHz 1 59 1 71 1 36 1...

Страница 25: ...b 35 C to 55 C 25W avg 0 01 to 5 8 GHz 500W pk 5 8 to 18 GHz 125W pk 500W s pulse Type N m Net 0 8 kg 1 75 lb Shipping 1 5 kg 3 25 lb 8482B 100 kHz to 4 2 GHz 100 kHz to 2 GHz 1 10 2 GHz to 4 2 GHz 1...

Страница 26: ...eight 8481H 10 MHz to 18 GHz 10 MHz to 8 GHz 1 20 8 GHz to 12 4 GHz 1 25 12 4 GHz to 18 GHz 1 30 25 dBm to 35 dBm 5 3 5W avg 100W pk 100W s pulse Type N m Net 0 2 kg 0 38 lb Shipping 0 5 kg 1 0 lb 848...

Страница 27: ...ipping 0 5 kg 1 0 lb Option 8485A 033 26 5 MHz to 33 GHz 26 5 GHz to 33 GHz 1 40 10 dBm to 20 dBm 3 300 mW avg 15 W pk 30 W s pulse APC 3 5mm m Net 0 2 kg 0 38 lb Shipping 0 5 kg 1 0 lb 8481A 10 MHz t...

Страница 28: ...MHz to 100 MHz 1 15 100 MHz to 2 GHz 1 10 2 GHz to 12 4 GHz 1 15 12 4 GHz to 18 GHz 1 20 18 GHz to 26 5 GHz 1 25 26 5 GHz to 40 GHz 1 30 40 GHz to 50 GHz 1 50 10 dBm to 20 dBm 3 300 mW avg 15W pk 30 W...

Страница 29: ...18 GHz 10 MHz to 30 MHz 1 40 30 MHz to 4 GHz 1 15 4 GHz to 10 GHz 1 20 10 GHz to 15 GHz 1 30 15 GHz to 18 GHz 1 35 30 dBm to 20 dBm 1 100 mW avg 100 mW pk Type N m Net 0 16 kg 0 37 lb Shipping 0 5 kg...

Страница 30: ...50 MHz to 100 MHz 1 19 100 MHz to 2 GHz 1 15 2 GHz to 12 4 GHz 1 20 12 4 GHz to 18 GHz 1 29 18 GHz to 34 GHz 1 37 34 GHz to 40 GHz 1 61 40 GHz to 50 GHz 1 89 30 dBm to 20 dBm 2 100 mW avg 100 mW pk 10...

Страница 31: ...Introduction 1 Keysight 8480 Series Operating and Service Manual 31 Figure 1 6 Typical CAL FACTOR and SWR vs Frequency Frequency GHz Cal factor SWR SWR CF...

Страница 32: ...1 Introduction 32 Keysight 8480 Series Operating and Service Manual Figure 1 7 Typical CAL FACTOR and SWR vs Frequency 8485D...

Страница 33: ...Introduction 1 Keysight 8480 Series Operating and Service Manual 33 Figure 1 8 Typical CAL FACTOR and SWR vs Frequency 8487D...

Страница 34: ...ontainers and materials identical to those used in factory packaging are available through Keysight Technologies offices If the instrument is being returned to Keysight Technologies for servicing atta...

Страница 35: ...calibration procedure located in your power meter s user s guide Temperature Sensitivity The sensitivity of the power sensor is influenced by ambient temperature The sensor should be recalibrated at...

Страница 36: ...nd the maximum is 100 If the cal factor setting for your frequency of interest is below the meter s minimum or above the meter s maximum set the cal factor control to 100 and divide the reading in wat...

Страница 37: ...170 from the displayed reading Table 1 9 Cal factor to dB conversion chart Cal factor dB Cal factor dB 70 1 55 101 0 43 71 1 49 102 0 86 72 1 43 103 0 128 73 1 37 104 0 170 74 1 31 105 0 212 75 1 25 1...

Страница 38: ...or submultiples of the chopper frequency beat notes may occur Unless these beat notes are exactly the chopper frequency they can usually be eliminated by averaging filtering since the amplitudes are...

Страница 39: ...d Service Manual 39 2 General Information Connector Care 40 Performance Test 41 Adjustments 50 Replaceable Parts 51 This chapter contains information about recommended equipment performance tests and...

Страница 40: ...ensors have a Type N hex nut for tightening to the device under test or the power meter s 1 mW Power Reference Older 8480 series power sensors have a knurled portion on the connector Turn the connecto...

Страница 41: ...res the following equipment PNA Series network analyzer 8753ES and or 8510C calibration kit 85036B and or 85052B Procedure 1 Turn on the network analyzer and allow it to warm up for approximately an h...

Страница 42: ...0 0 048 2 to 12 4 GHz 1 18 0 083 12 4 to 18 GHz 1 28 0 123 8482A 100 to 300 kHz 1 60 0 231 300 kHz to 1 MHz 1 20 0 091 1 MHz to 2 GHz 1 10 0 048 2 to 4 2 GHz 1 30 0 130 8483A 100 to 600 kHz 1 80 0 286...

Страница 43: ...0 kHz to 2 GHz 1 10 0 048 2 to 4 2 GHz 1 18 0 083 8481H 10 MHz to 8 GHz 1 20 0 091 8 to 12 4 GHz 1 25 0 112 12 4 to 18 GHz 1 30 0 130 8482H 100 kHz to 4 2 GHz 1 20 0 091 8481D 10 to 30 MHz 1 40 0 167...

Страница 44: ...ero This performance test requires a compatible Keysight power meter with the DUT and a computer with the Keysight IO Libraries Suite installed 4 to 12 GHz 1 19 0 085 12 to 18 GHz 1 25 0 112 18 to 26...

Страница 45: ...meter as shown in the following figure Figure 2 2 DUT to power meter connection 2 Warm up the DUT for approximately 30 minutes Recommended 50 MHz 50 Ohm Type N f to 75 Ohm Type N m 11852B adapter use...

Страница 46: ...ing UNIT POW W 10 Disconnect the DUT from the power meter 1 mW calibrator 11 Perform zeroing for the DUT by sending CAL ZERO AUTO ONCE 12 Set the DUT to the single trigger mode by sending INIT CONT OF...

Страница 47: ...the DUT using the reference sensor with the power meter For 8481 5 7D models during the zero and calibration please use the 50 MHz 30 dBm attenuator pad 11708A 3 Connect the power splitter 11667A opti...

Страница 48: ...r level using the following equations 9 Compare and record the calculated linearity error against the system linearity error specifications 10 Repeat step 6 to step 9 by sweeping through the warranted...

Страница 49: ...or in the system at 50 MHz The error specification caused by the reference sensor and the DUT can be found in their respective data sheet The RSS error specification calculation is computed by using t...

Страница 50: ...n has indicated that some parameters are out of specification Performance verification must be completed after any repairs that may have altered the characteristics of the 8480 Series power sensors Th...

Страница 51: ...Replaceable Parts Table 2 2 to Table 2 7 are a list of replaceable parts Figure 2 4 illustrates the major parts To order a part listed in Table 2 2 to Table 2 7 contact your nearest Keysight Technolo...

Страница 52: ...1B A1 08481 60019 1 Bulkhead Assembly Type N 8482B A1 08482 60011 1 Bulkhead Assembly Type N 8481D A1 08481 60145 1 Bulkhead Assembly Type N 8485D A1 08485 60008 1 Bulkhead Assembly 3 5mm 8485D Opt 03...

Страница 53: ...ble 2 5 Adapters and attenuators Model Part number Quantity Description 8483A 1250 0597 1 50 Ohm to 75 Ohm Coax Adapter 8485A 8485D 08485 60005 1 3 5mm to N m Coax Adapter 8487A 8487D 08487 60001 1 2...

Страница 54: ...001 1 8482H ID Label Table 2 6 Identification labels Model Part number Quantity Description Table 2 7 Miscellaneous labels Part number Quantity Description 08481 80115 1 Cal Label Blank For Zebra bran...

Страница 55: ...l 55 3 Service Principles of Operation 56 Troubleshooting 59 Repair 63 FET Balance Adjustment 65 Disassembly Reassembly Procedures 69 This Service chapter contains information about principles of oper...

Страница 56: ...h to the A2 Power Sensor Board Assembly The dc output from the bulkhead assembly is applied to the two field effect transistors FETs in A2U1 These transistors function as a sampling gate or chopper Th...

Страница 57: ...g gate output at pin 3 of A2U1 is a 220 Hz square wave proportional to the power input The sampled 220 Hz ac output is applied to the input amplifier A2Q1 which is the input stage for an operational a...

Страница 58: ...3 Service 58 Keysight 8480 Series Operating and Service Manual Figure 3 1 Schematic diagram...

Страница 59: ...titute a known good power sensor cable Troubleshooting should be performed with the Power Sensor opened and the printed circuit board exposed Refer to the Disassembly Reassembly Procedures on page 69...

Страница 60: ...ensors The most common cause of Power Sensor failure is the application of power levels beyond the specified tolerance The second most common cause of failure is applying torque to the body of the Pow...

Страница 61: ...30dB Attenuator 5 Turn on the 1mW Power Reference and measure the voltage across the two gold wires The voltage should be between 0 9mV and 1 5mV If the voltage is incorrect then the A1 Bulkhead Asse...

Страница 62: ...he A2 Assembly to fail Eliminate the power meter the sensor cable and the A1 Bulkhead Assembly before suspecting the A2 Assembly In most cases the operational amplifier made up of A2Q1 and the first a...

Страница 63: ...nd replacement See Disassembly Reassembly Procedures on page 69 3 Check the FET balance using the procedure described in FET Balance Adjustment on page 65 If you did not disturb the wires it is likely...

Страница 64: ...ed in order to remove and replace the wires from connector J1 Remember that the Power Sensor is a highly sensitive device As such it is affected by very small temperature differences between its compo...

Страница 65: ...f the Power Sensor chopped signal Ideally when no RF power is applied to the power sensor the High Gain output signal displayed on the oscilloscope is a straight line If there is a sensor offset the o...

Страница 66: ...illoscope and set it up as follows 3 Connect the CHOP OUTPUT on the modified Power Meter to CHANNEL 2 on the Oscilloscope and set it up as follows CAL FACTOR 100 POWER REF ON POSITION 0 Volts centered...

Страница 67: ...his shows an example of a High Gain output signal with acceptable sensor offset and spike balance settings Figure 3 2 Example of an acceptable waveform 6 Allow no more than 50 mV variance on the senso...

Страница 68: ...waveform shown on the oscilloscope does not change If the waveform has changed remove the cover and readjust the black white and brown white wires again NOTE You will find that positioning the wire f...

Страница 69: ...y the sections apart See CAUTION Disassembly must be performed in sequence described in the following procedure otherwise damage may be caused to the two gold wires between the bulkhead assembly and t...

Страница 70: ...op The small hole 5 should be on the left side of the RF input connector Remove the allen cap screws 1 2 10 and 13 Loosen 11 and 12 Remove the upper chassis from the Power Sensor 4 Remove the spring c...

Страница 71: ...nual 71 Figure 3 5 Power sensor hardware locations Reassembly Procedures CAUTION The gold wires connecting the A1 Bulkhead assembly and the A2 power sensor board assembly are extremely delicate and ma...

Страница 72: ...ck plastic guide on A2 input amplifier 6 Using tweezers position the ends of the gold wires over the electrical pads 7 Place and hold plastic clamp 16 over the gold wires As you tighten the clamp scre...

Страница 73: ...3 A EPM Series Power Meter E4418B Modification The Material and Tools Required 74 Modification Procedure 75 This Appendix describes the modification procedure for adapting an E4418B Power Meter to all...

Страница 74: ...AWG 20 single core wire Three screw fit BNC Female connectors Keysight Part Number 1250 0118 A fine tip marker pen and adhesive labels A 10 20 Watt pencil tip soldering iron 60 40 0 8 mm rosin activat...

Страница 75: ...1 Using the T 15 torque screwdriver remove the two screws shown in Figure A 1 Figure A 1 Remove screws 2 Remove the power meter handle To remove the handle pull the 2 ends as shown in Figure A 2 CAUT...

Страница 76: ...ight 8480 Series Operating and Service Manual Figure A 2 Remove the power meter handle 3 Remove the power meter cover To remove the cover slide it open as shown in Figure A 3 Figure A 3 Remove the pow...

Страница 77: ...ting and Service Manual 77 4 Figure A 4 shows the power meter with its cover removed Figure A 4 Power meter with its cover removed 5 Use the razor blade or craft knife to remove three hole plugs in th...

Страница 78: ...fferent view of the holes in the rear panel Figure A 6 Holes in the rear panel 7 Using the three lengths of AWG 20 wire strip away 2cm from each end of the wires Solder an end of each wire onto the sc...

Страница 79: ...igure A 8 Use the 25 lb in torque wrench to tighten the nuts Figure A 8 Fit the three BNC connectors into the three holes in the rear panel 9 The Measurement PCB A6 must now be modified The call outs...

Страница 80: ...and Service Manual Figure A 9 Location to solder each wire 10 Figure A 10 shows a different view of the modified Measurement PCB Figure A 10 Different view of the modified Measurement PCB Chop Output...

Страница 81: ...Label each of the BNC connectors using the permanent marker and adhesive labels as shown in Figure A 11 Refit the cover handle and the rear bumper to the power meter Tighten both screws with the T 15...

Страница 82: ...A EPM Series Power Meter E4418B Modification 82 Keysight 8480 Series Operating and Service Manual THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK...

Страница 83: ...Keysight 8480 Series Coaxial Power Sensors Operating and Service Manual 83 B Bulkhead Assemblies This Appendix contains the material lists and exploded graphics of the Bulkhead Assemblies...

Страница 84: ...0306 MP6 Center Conductor Cartridge Adapter 5020 3296 5020 3296 5020 3296 MP7 Compression Spring 1460 0977 1460 0977 1460 0977 MP8 Sliding Contact 5020 3297 5020 3297 5020 3297 MP9 Bulkhead 08481 2001...

Страница 85: ...Spring 1460 0977 MP8 Sliding Contact 5020 3297 MP9 Adapter Connector 08481 20034 MP10 Center Conductor Contact 08481 20032 MP11 Insulator 5040 0306 MP12 Stepped Center Conductor 08481 20033 MP13 Rear...

Страница 86: ...Contact 5020 3297 5020 3297 MP9 Housing 08492 2000 08492 2000 MP10 Attenuator Adapter 5021 0154 5021 0154 MP11 Sliding Contact 5020 3297 5020 3297 MP12 Compression Spring 1460 1547 1460 1547 MP13 Con...

Страница 87: ...H Table B 4 Bulkhead parts for the 8483A model Reference designator Part description Sensor model 8483A MP1 Connector Nut 5021 7255 MP2 Connector Component 1250 0016 MP3 Connector Body 1250 2132 MP4 C...

Страница 88: ...1 MP4 Outer External Coax 5021 7092 5021 7092 MP5 Outer Conductor Spacer 00281 20046 00281 20046 MP6 Center Conductor 5040 6958 5040 6958 MP7 Center Internal Coax 5021 7093 5021 7093 MP8 Bellows 0955...

Страница 89: ...ct 1250 2115 1250 2115 MP7 Bead Ring Assembly 1250 2107 1250 2107 MP8 Internal Center Conductor 08487 20003 08487 20003 MP9 Bellows 0955 0333 0955 0333 MP10 Outer Internal Coax 08487 20004 08487 20004...

Страница 90: ...B Bulkhead Assemblies 90 Keysight 8480 Series Operating and Service Manual Bulkhead Exploded Graphics Figure B 1 8481A and 8481B...

Страница 91: ...Bulkhead Assemblies B Keysight 8480 Series Operating and Service Manual 91 Figure B 2 8481A Option 001...

Страница 92: ...B Bulkhead Assemblies 92 Keysight 8480 Series Operating and Service Manual Figure B 3 8482A and 8482B...

Страница 93: ...Bulkhead Assemblies B Keysight 8480 Series Operating and Service Manual 93 Figure B 4 8481D...

Страница 94: ...B Bulkhead Assemblies 94 Keysight 8480 Series Operating and Service Manual Figure B 5 8481H and 8482H 8481H Only 8481H Only...

Страница 95: ...Bulkhead Assemblies B Keysight 8480 Series Operating and Service Manual 95 Figure B 6 8483A...

Страница 96: ...B Bulkhead Assemblies 96 Keysight 8480 Series Operating and Service Manual Figure B 7 8485A 8485A Opt 033 8485D and 8485D Opt 033...

Страница 97: ...Bulkhead Assemblies B Keysight 8480 Series Operating and Service Manual 97 Figure B 8 8487A and 8487D...

Страница 98: ...B Bulkhead Assemblies 98 Keysight 8480 Series Operating and Service Manual THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK...

Страница 99: ...to change without notice Always refer to the English version at the Keysight website for the latest revision Keysight Technologies 2003 2017 Edition 6 October 1 2017 Printed in Malaysia 08481 90173 0...

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