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Keysight Technologies 8480 Series, Operating And Service Manual

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Keysight Technologies 8480 Series Operating And Service Manual Download Page 21

Introduction

1

Keysight 8480 Series Operating and Service Manual

21

50 GHz Frequency operation (8487A and 8487D)

8480 series sensors that operate up to 50 GHz are fitted with 2.4mm (m) 

connectors as standard. To convert the 2.4mm (m) connector for calibration, 

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-year calibration cycle for the 8480 

series power sensors.

NOTE

The 2.4mm to Type-N adapter is intended for use only at the 1 mW, 50 MHz 

power reference of the power meter. Its function as a calibration reference may 

be compromised if used for other purposes. 

Summary of Contents for 8480 Series

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

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

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

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

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

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

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

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

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

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

Page 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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