Keysight Technologies 8481A Operating And Service Manual
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Keysight Technologies 8481A Operating And Service Manual

Keysight Technologies 8481A Operating And Service Manual

Coaxial power sensors
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Keysight 8480 Series Coaxial
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Operating and
Service Manual

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Summary of Contents for Keysight Technologies 8481A

  • Page 1 Keysight 8480 Series Coaxial Power Sensors Operating and Service Manual...
  • Page 2 Federal Acqui- DOCUMENT IS PROVIDED “AS IS,” sition Regulation (“FAR”) 2.101. Pursu- AND IS SUBJECT TO BEING © Keysight Technologies 2003-2017 ant to FAR 12.212 and 27.405-3 and CHANGED, WITHOUT NOTICE, IN No part of this manual may be repro- Department of Defense FAR Supple- FUTURE EDITIONS.

  • Page 3: Notice

    Notice The information contained in this document is subject to change without notice. Keysight Technologies makes no warranty of any kind with regard to this material, including but 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 damages in connection with the furnishing, performance, or use of this material.

  • Page 4: Manufacturer's Declaration

    Manufacturer's Declaration This statement is provided to comply with the requirements of the German Sound Emission Directive, from 18 January 1991. This product has a sound pressure emission (at the operator position) < 70 dB(A). – Sound Pressure Lp < 70 dB(A). –...

  • Page 5: Regulatory Markings

    Regulatory Markings The CE mark is a registered trademark of the European Community. This CE mark shows that the product complies with all the relevant European Legal Directives. [a] The CE mark is only applicable for 8481D, 8487D and 8485D. Sales and Technical Support To contact Keysight for sales and technical support, refer to the support links on the following Keysight websites:...
  • Page 6 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 8480 Series Operating and Service Manual...

  • Page 7: Table Of Contents

    Table of Contents Notice ........... . 3 Warranty .
  • Page 8 Zero set performance verification ......44 Power linearity performance verification ..... 46 Adjustments .
  • Page 9 List of Figures Figure 1-1 Example serial number ......14 Figure 1-2 8480 Series power sensor simplified block diagram .
  • Page 10 ......81 Figure B-1 8481A and 8481B ......90...
  • Page 11 ....61 Table B-1 Bulkhead parts for the 8481A, 8481B, 8482B, and 8482B models ........84...
  • Page 12 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 8480 Series Operating and Service Manual...
  • Page 13 Keysight 8480 Series Coaxial Power Sensors Operating and Service Manual Introduction General Information 8480 Series Power Sensor Specifications Installation Operation This Operating and Service Manual contains information about initial inspection, performance tests, adjustments, operation, troubleshooting and repair of the Keysight 8480 Series Coaxial Power Sensors.

  • Page 14: Introduction

    Introduction General Information Instruments Covered by Manual A serial number label is attached to the power sensor. The serial number has two parts: the prefix (two letters and the first four numbers), and the suffix (the last four numbers). Refer to the Example Serial Number shown in Figure 1-1.
  • Page 15 Introduction power meter. Suitable and compatible power meters are the EPM series power meters (E4418B and E4419B), the EPM-P series power meters (E4416A and E4417A) and the E1416A VXI power meter. Discontinued and obsolete power meters that are compatible with the 8480 series sensors include the E4418A, E4419A, 435B, 436A, 437B, 438A and 70100A MMS power meter.
  • Page 16 Introduction Cable Balanced Chopper AC Signal Input Thermistor Feed back Autozero Chop Signal Chop Signal Figure 1-2 8480 Series power sensor simplified block diagram Figure 1-2 shows a basic power sensor block diagram for both thermocouple and diode power sensing elements. From the RF or microwave signal input, both thermocouple and diode detector mounts generate very low voltages, (on the order of nV or µV).

  • Page 17: Dimensions

    8480 Series power sensor dimensions (including the RF connector) 8480 series power Dimensions sensor models 8481A, 8482A and 8483A: 38 mm wide, 30 mm high, 105 mm long (1.5 in. x 1.2 in. x 4.1 in) A-models 8485A and 8487A: 38 mm wide, 30 mm high, 95 mm long (1.5 in.

  • Page 18: 8480 Series, Options

    Introduction Removal of the D-ring that is on the sensor assembly WILL VOID THE CAUTION WARRANTY. The input connector on the sensor has a D-ring to prevent the sensor from being connected to a high power source when its attenuator is not attached.

  • Page 19: Figure 1-3 Mechanical Adapter (8483A Only)

    Introduction from the data on the sensor label, should be used for any power measurements in a 75 ohm system at 50 MHz. Remove the mechanical adapter from the power sensor before connecting CAUTION the sensor to a 75 ohm source. Figure 1-3 Mechanical adapter (8483A Only) D-model 8480 series sensors (8481D, 8485D, 8485D-033 and 8487D)

  • Page 20: Figure 1-4 8485A, 8485A-033, 8485D, 8485D-033 Sensor Accessories

    Introduction The 11708A 30 dB attenuator is intended for use only at the 1 mW, 50 MHz NOTE power reference of the power meter. Its function as a calibration reference may be compromised if used for other purposes. 26.5 GHz and 33 GHz Frequency operation (8485A, 8485A-033, 8485D and 8485D-033) 8480 series sensors that operate up to 26.5 GHz and 33 GHz are fitted with APC-3.5mm (m) connectors as standard.

  • Page 21: Recommended Calibration Interval

    Its function as a calibration reference may be compromised if used for other purposes. 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. Keysight 8480 Series Operating and Service Manual...
  • Page 22 Introduction Warranty The 8480 series power sensors described in this manual are warranted and certified as indicated on the inside cover of 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 under warranty will be examined carefully to determine if the failure was possibly due to improper use.

  • Page 23: 8480 Series Power Sensor Specifications

    SWR over a wide range of frequencies (100 kHz to 50 GHz) and power levels (-70 dBm to +44 dBm) 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: Table 1-4 Typical Measurement Uncertainties Of Calibration Factor (Cf) Data Printed On The Power Sensor

    Introduction Table 1-4 Typical measurement uncertainties of Calibration Factor (CF) data printed on the power sensor 25°C ± 3°C Frequency 8487A 8481B 8482B 8481H 8482H 8487D 8485D 8481D 100 kHz to 10 MHz 1.50 0.91 10 MHz to 30 MHz 1.48 1.44 0.86...

  • Page 25: Table 1-5 25 Watt Sensors, 1 Mw To 25 W (0 Dbm To +44 Dbm)

    Introduction Table 1-5 25 Watt sensors, 1 mW to 25 W (0 dBm to +44 dBm) Power Frequency Maximum Model Maximum SWR Connector type Weight range power linearity 0°C to 35°C: 30W avg 10 MHz to 35°C to 55°C: 2 GHz: 1.10 Net: 0.8 kg 25W avg (1.75 lb)

  • Page 26: Table 1-6 3 Watt Sensors, 100 Μw To 3 W (-10 Dbm To +35 Dbm)

    Introduction Table 1-6 3 Watt sensors, 100 µW to 3 W (–10 dBm to +35 dBm) Power Frequency Maximum Model Maximum SWR Connector type Weight range power linearity 10 MHz to 8 GHz: 1.20 Net: 0.2 kg 3.5W avg, (0.38 lb) 10 MHz to 18 8 GHz to +25 dBm to...

  • Page 27: Table 1-7 100 Mw Sensors, 1 Μw To 100 Mw (-30 Dbm To +20 Dbm)

    Net: 0.2 kg 300 mW avg, (0.38 lb) 10 MHz to 18 50 MHz to 2 +10 dBm to +20 15 W pk 8481A Type-N(m) GHz: 1.10 dBm: ±3% Shipping: 0.5 kg 30 W.µs / pulse (1.0 lb) 2 GHz to 12.4 GHz: 1.18...
  • Page 28 Introduction Table 1-7 100 mW sensors, 1 µW to 100 mW (–30 dBm to +20 dBm) Power Frequency Maximum Model Maximum SWR Connector type Weight range power linearity 100 kHz to 600 Net: 0.2 kg (0.38 8483A kHz: 1.80 Type-N(m) 100 kHz to +10 dBm to +20 300 mW avg,...

  • Page 29: Table 1-8 High Sensitivity Sensors, 100 Pw To 10 Μw (-70 Dbm To -20 Dbm)

    Introduction Table 1-8 High sensitivity sensors, 100 pW to 10 µW (–70 dBm to –20 dBm) Power Frequency Maximum Model Maximum SWR Connector type Weight range power linearity 10 MHz to 30 MHz: 1.40 30 MHz to 4 GHz: 1.15 Net: 0.16 kg (0.37 lb) 10 MHz to 18...

  • Page 30: Supplemental Characteristics

    Introduction Table 1-8 High sensitivity sensors, 100 pW to 10 µW (–70 dBm to –20 dBm) Power Frequency Maximum Model Maximum SWR Connector type Weight range power linearity Net: 0.2 kg (0.38 Option 50 MHz to 26.5 GHz to -30 dBm to 100 mW avg, APC - 3.5mm 8485D...

  • Page 31: Figure 1-6 Typical Cal Factor And Swr Vs. Frequency

    Introduction Frequency (GHz) Figure 1-6 Typical CAL FACTOR and SWR vs. Frequency Keysight 8480 Series Operating and Service Manual...

  • Page 32: Figure 1-7 Typical Cal Factor And Swr Vs. Frequency (8485D)

    Introduction Figure 1-7 Typical CAL FACTOR and SWR vs. Frequency (8485D) Keysight 8480 Series Operating and Service Manual...

  • Page 33: Figure 1-8 Typical Cal Factor And Swr Vs. Frequency (8487D)

    Introduction Figure 1-8 Typical CAL FACTOR and SWR vs. Frequency (8487D) Keysight 8480 Series Operating and Service Manual...

  • Page 34: Installation

    Containers 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, attach a tag indicating the type of service required, return address, model number, and serial number. Also, mark the container FRAGILE to assure careful handling.

  • Page 35: Operation

    Introduction Operation Environment The operating environment for the Power Sensor should be as follows: Temperature 0 to +55 Relative humidity <95% Altitude < 4,572 metres (15,000 ft.) Operating Precautions Before the Power Sensor is connected, the following precautions must be observed.

  • Page 36: Figure 1-9 Typical Influence Of Temperature On Sensitivity

    Introduction Temperature ( -0.5 -1.0 Figure 1-9 Typical influence of temperature on sensitivity Operating Instructions To operate the Power Sensor, refer to the operating instructions in of the power meter’s user’s guide. Power Measurements To correct for varying responses at different frequencies a cal factor table is included on the Power Sensors.

  • Page 37: Table 1-9 Cal Factor To Db Conversion Chart

    Introduction value. On the other hand, if the cal factor is 104%, subtract 0.170 from the displayed reading. Table 1-9 Cal factor to dB conversion chart Cal factor Cal factor 1.55 101% –0.43 1.49 102% –0.86 1.43 103% –0.128 1.37 104% –0.170 1.31...
  • Page 38 Introduction Modulation Effects When measuring RF or microwave sources that are modulated at the chopper frequency (nominally 220 Hz), at the first or second harmonic 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 plus and minus the actual power.
  • Page 39 Keysight 8480 Series Coaxial Power Sensors Operating and Service Manual General Information Connector Care Performance Test Adjustments Replaceable Parts This chapter contains information about recommended equipment, performance tests, and replacement parts of the Keysight Coaxial Power Sensors.

  • Page 40: General Information

    General Information Connector Care Keeping in mind its flammable nature, a solution of pure isopropyl or ethyl alcohol can be used to clean connectors. The RF connector bead deteriorates when contacted by any chlorinated or CAUTION aromatic hydrocarbon such as acetone, trichlorethane, carbon tetrachloride, and benzene.

  • Page 41: Performance Test

    General Information Performance Test Voltage standing wave ratio (VSWR) and reflection coefficient (Rho) performance verification test VSWR is a measure of how efficiently radio frequency (RF) power is transmitted from an RF power source. In real systems, mismatched impedances between the RF source and load can cause some of the power to be reflected towards the source and vary the VSWR.

  • Page 42: Table 2-1 Power Sensor Swr And Reflection Coefficient

    General Information Table 2-1 Power sensor SWR and reflection coefficient Frequency Maximum SWR (reflection coefficient) Actual measurement 8481A 10 to 30 MHz < 1.40 (0.166) 30 to 50 MHz < 1.18 (0.083) 50 MHz to 2 GHz < 1.10 (0.048) 2 to 12.4 GHz...
  • Page 43 General Information Table 2-1 Power sensor SWR and reflection coefficient Frequency Maximum SWR (reflection coefficient) Actual measurement 12.4 to 18 GHz < 1.20 (0.091) 18 to 26.5 GHz < 1.25 (0.111) 26.5 to 40 GHz < 1.30 (0.130) 40 to 50 GHz <...

  • Page 44: Zero Set Performance Verification

    General Information Table 2-1 Power sensor SWR and reflection coefficient Frequency Maximum SWR (reflection coefficient) Actual measurement 4 to 12 GHz < 1.19 (0.085) 12 to 18 GHz < 1.25 (0.112) 18 to 26.5 GHz < 1.29 (0.127) 8487D 50 to 100 MHz <...

  • Page 45: Figure 2-2 Dut To Power Meter Connection

    General Information Recommended 50 MHz, 50 Ohm Type-N (f) to 75 11852B adapter Ohm Type-N (m): (used with 8483A) Recommended 50 MHz, 30 dB Attenuator Pad 11708A adapter APC-3.5mm to Type-N: (used with 8481/5/7D) Procedure Power meter Figure 2-1 Zero set performance verification equipment setup 1 Connect the DUT (8483A/1D/5D/7D) to the power meter as shown in the following figure.

  • Page 46: Power Linearity Performance Verification

    General Information 3 Launch the Interactive IO on the Keysight IO Libraries Suite to send SCPI commands to the DUT. 4 Reset the power meter in a known state by sending “*RST” command, followed by “SYST:PRES” command to pre-set the meter's output to its default value.

  • Page 47: Figure 2-3 Power Linearity Performance Verification Equipment Setup

    General Information – power splitter (11667A-Option 001) – amplifier – step attenuators (8494H and 8496H) – attenuator/switch driver (11713B) – 50 MHz, 30 dBm attenuator pad (11708A) Procedure 1 Turn on the signal generator and power meter. Connect the DUT (848xA) to the channel A and the reference sensor (N8481A) to the channel B of the power meter (E4416/7A).
  • Page 48 General Information 5 Start tuning the signal generator and/or attenuator/switch driver (optional) until the DUT measures the power level as close as 0 dBm. Record the values as P at 0 dBm and P at 0 dBm. Do not exceed the maximum input power (27 dBm) of the power splitter to CAUTION avoid damage to the power splitter.
  • Page 49 DUT error 2 Ref sensor error 2 System linearity error specification ± The following example of the DUT is measured at 50Mhz, 20dBm: – DUT used is 8481A – Reference sensor used is N8481A (3%) 2 (0.8%) 2 System linearity error specification 3.10%...

  • Page 50: Adjustments

    General Information Adjustments Adjustments are usually required on a yearly basis. They are normally performed only after a performance verification 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. The 8480 Series power sensors can be adjusted using the Keysight N7800 Series calibration software or can be returned to Keysight for adjustments.

  • Page 51: Replaceable Parts

    Figure 2-4 illustrates the major parts. To order a part listed in Table 2-2 Table 2-7, contact your nearest Keysight Technologies Sales and Service Office. Figure 2-4 Illustrated major parts breakdown Keysight 8480 Series Operating and Service Manual...

  • Page 52: Table 2-2 Bulkhead Assembly

    Table 2-2 Bulkhead assembly Reference Model Part number Quantity Description designator 8481A 08481-60004 Bulkhead Assembly, Type N 8481A Opt 001 08481-60005 Bulkhead Assembly, Type APC-7 8482A 08482-60003 Bulkhead Assembly, Type N 8483A 08483-60003 Bulkhead Assembly, Type N 8485A 08485-60007 Bulkhead Assembly, 3.5mm...

  • Page 53: Table 2-4 Common Chassis Components

    11708-60001 Precision 30dB Attenuator Table 2-6 Identification labels Model Part number Quantity Description 8481A 08481-80002 8481A ID Label 8482A 08482-80002 8482A ID Label 8483A 08483-80001 8483A ID Label 8485A 08485-80002 8485A ID Label Keysight 8480 Series Operating and Service Manual...

  • Page 54: Table 2-7 Miscellaneous Labels

    General Information Table 2-6 Identification labels Model Part number Quantity Description 8487A 08487-80001 8487A ID Label 8481B 08481-80004 8481B ID Label 8482B 08482-80003 8482B ID Label 8481D 08481-80011 8481D ID Label 8485D 08485-80003 8485D ID Label 8487D 08487-80004 8487D ID Label 8481H 08481-80003 8481H ID Label...

  • Page 55: Service

    Keysight 8480 Series Coaxial Power Sensors Operating and Service Manual Service Principles of Operation Troubleshooting Repair FET Balance Adjustment Disassembly / Reassembly Procedures This Service chapter contains information about principles of operation, troubleshooting, and repair of the Keysight Coaxial Power Sensors.

  • Page 56: Principles Of Operation

    Service Principles of Operation Thermocouple sensors The A1 Bulkhead Assembly presents a 50 Ohm load (75 Ohm for model 8483A) to the RF source. The RF signal is coupled through a dc blocking capacitor and absorbed by the thermocouples, generating a dc voltage proportional to the RF input power. The dc voltage is routed from the thermocouples to the input amplifier via gold wires reducing unwanted thermocouple effects.

  • Page 57: Diode Sensors

    Service Diode sensors The A1 Bulkhead Assembly presents a 50 Ohm load to the RF source. A diode assembly in the bulkhead rectifies the applied RF to produce a dc voltage that varies with the square of the RF power across the 50 Ohm load. Thus the voltage varies with the RF power dissipated in the load.

  • Page 58: Figure 3-1 Schematic Diagram

    Service Figure 3-1 Schematic diagram Keysight 8480 Series Operating and Service Manual...

  • Page 59: Troubleshooting

    Service Troubleshooting Troubleshooting information is intended to first isolate the Power Sensor or the Power Meter as the defective component. When the Power Sensor is isolated, troubleshooting information is intended to identify the A1 Bulkhead Assembly or the A2 Power Sensor Board Assembly as the defective component. Before you open the Power Sensor to continue with the troubleshooting procedures, try the substitution method of elimination.

  • Page 60: Troubleshooting - Power Sensors

    Service This is done by ensuring the power meter is providing the correct 220Hz drive signal. Check the following levels of the square wave with an oscilloscope. – At the black/white wire: -0.05 ± 0.05 Vdc (top of square wave). –...

  • Page 61: Table 3-1 Bulkhead Assembly Resistance

    Service Table 3-1 Bulkhead assembly resistance Model Measured resistance 8481A, 8481B, 8481H, 8485A, 8487A: 200 Ohms ± 10 Ohms 8482A, 8482B, 8482H: 245 Ohms ± 12.5 Ohms 8483A: 375 Ohms ± 17.5 Ohms If the resistance value is incorrect (failure is usually indicated by an open circuit), then the A1 Bulkhead Assembly is defective.
  • Page 62 Service A2 Power Sensor Board Assembly It is extremely rare for the 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 amplifier of the power meter,) is operating correctly if the dc voltage on the metal cover of A2Q1 (collector) is -70 ±30 mV dc.

  • Page 63: Repair

    Service Repair Power Sensor repair consists of replacing either the A1 Bulkhead Assembly, or the A2 Power Sensor Board Assembly. A1 Bulkhead Assembly Repair Strategy The recommended repair strategy for the A1 Bulkhead Assembly is to completely replace it. The replacement Bulkhead is calibrated at the factory, and is supplied with a calibration report and a new calibration sticker for the Power Sensor.

  • Page 64: A2 Power Sensor Board Assembly

    Service A2 Power Sensor Board Assembly Repair Strategy The recommended repair strategy for the A2 Power Sensor Board Assembly is to completely replace it. Replacing this assembly is usually less costly than the time it takes to troubleshoot and replace faulty components. Procedure When replacing the A2 Power Sensor Board Assembly, some soldering is required in order to remove and replace the wires from connector J1.

  • Page 65: Fet Balance Adjustment

    Service 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.

  • Page 66: Fet Balance Procedure

    Service FET Balance Procedure 1 Set the power meter as follows: CAL FACTOR 100% POWER REF 2 Connect the HIGH GAIN OUTPUT on the modified Power Meter to CHANNEL 1 on the Oscilloscope and set it up as follows: POSITION 0 Volts (centered) COUPLING PROBE...

  • Page 67: Figure 3-2 Example Of An Acceptable Waveform

    Service 4 Connect the Power Sensor to channel A of the Power Meter. Heat can affect the adjustments so handle the sensor as little as possible. NOTE 5 Adjust the black/white and brown/white wires until the waveform shown on the oscilloscope is similar to that shown in Figure 3-2.

  • Page 68: Figure 3-3 Example Of An Unacceptable Waveform

    Service Figure 3-3 Example of an unacceptable waveform You will find that positioning the wire for switching transients affects the offset. NOTE Go back and forth between the two wires, positioning and repositioning, until both adjustments are deemed acceptable. 7 Reassemble the Power Sensor, ensuring that the waveform shown on the oscilloscope does not change.

  • Page 69: Disassembly / Reassembly Procedures

    Service Disassembly / Reassembly Procedures Disassembly Procedure Disassemble the Power Sensor by performing the following steps: Disassembly must be performed in sequence described in the following CAUTION procedure, otherwise damage may be caused to the two gold wires between the bulkhead assembly and the Power Sensor Board Assembly. If these wires are damaged, the A1 Bulkhead Assembly must be replaced.

  • Page 70: Figure 3-4 Removing The Power Sensor's Cover

    Service Figure 3-4 Removing the power sensor’s cover 2 At the other side of the sensor, again pry the cover shell sections apart. Remove the shells and the inner magnetic shields. 3 Position the Power Sensor as shown in (top). The small hole 5 should be on the left side of the RF input connector.

  • Page 71: Reassembly Procedures

    Service Figure 3-5 Power sensor hard ware locations Reassembly Procedures The gold wires connecting the A1 Bulkhead assembly and the A2 power CAUTION sensor board assembly are extremely delicate and may be easily broken. Be careful when working around them. Keysight 8480 Series Operating and Service Manual...
  • Page 72 Service 1 Set the printed circuit board and connector into place as shown in , bottom view. 2 Insert cap screws 8, 9, 11, 12, 14, and 15 but do not tighten. 3 Center the circuit board so there is equal air gap between each side and the chassis.

  • Page 73: Epm Series Power Meter (E4418B) Modification

    Keysight 8480 Series Coaxial Power Sensors Operating and Service Manual EPM Series Power Meter (E4418B) Modification The Material and Tools Required Modification Procedure This Appendix describes the modification procedure for adapting an E4418B Power Meter to allow it to be used for the 8480 Series Power Sensor FET Balance Adjustment.

  • Page 74: The Material And Tools Required

    EPM Series Power Meter (E4418B) Modification The Material and Tools Required The following material and tools are required for this modification: – A T-15 torque screwdriver. – A Razor blade or Craft Knife. – Three 30 cm lengths of AWG 20 single core wire. –...

  • Page 75: Modification Procedure

    EPM Series Power Meter (E4418B) Modification Modification Procedure Precautions must be taken to protect the Power Meter’s PCBs from Electrical CAUTION Static Damage (ESD). 1 Using the T-15 torque screwdriver, remove the two screws shown in Figure A-1. Remove these 2 screws Figure A-1 Remove screws 2 Remove the power meter handle.

  • Page 76: Figure A-2 Remove The Power Meter Handle

    EPM Series Power Meter (E4418B) Modification Pull Pull 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. Slide cover this direction Figure A-3 Remove the power meter cover Keysight 8480 Series Operating and Service Manual...

  • Page 77: Figure A-4 Power Meter With Its Cover Removed

    EPM Series Power Meter (E4418B) Modification 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 the rear panel, as shown in Figure A-5.

  • Page 78: Figure A-6 Holes In The Rear Panel

    EPM Series Power Meter (E4418B) Modification Figure A-6 shows a different 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.

  • Page 79: Figure A-8 Fit The Three Bnc Connectors Into The Three Holes In The Rear Panel

    EPM Series Power Meter (E4418B) Modification 8 Securely fit the three BNC connectors into the three holes in the rear panel, as shown in Figure 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.

  • Page 80: Figure A-9 Location To Solder Each Wire

    EPM Series Power Meter (E4418B) Modification Chop Output Low Gain Output High Gain Output Figure A-9 Location to solder each wire Figure A-10 shows a different view of the modified Measurement PCB. Low Gain Output High Gain Output Chop Output Figure A-10 Different view of the modified Measurement PCB Keysight 8480 Series Operating and Service Manual...

  • Page 81: Figure A-11 Label The Bnc Connectors With A Permanent Marker And Adhesive Labels

    EPM Series Power Meter (E4418B) Modification 11 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 torque screwdriver. Figure A-11 Label the BNC connectors with a permanent marker and adhesive labels...
  • Page 82 EPM Series Power Meter (E4418B) Modification THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 8480 Series Operating and Service Manual...

  • Page 83: Bulkhead Assemblies

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

  • Page 84: Bulkhead Parts Lists

    Bulkhead Assemblies Bulkhead Parts Lists Table B-1 Bulkhead parts for the 8481A, 8481B, 8482B, and 8482B models Sensor model Reference Part description 8481A 8481A 8482A designator 8481B Opt 001 8482B Connector Nut 5021-7255 5021-7255 Connector Component 1250-0016 1250-0016 Connector Body...

  • Page 85: Table B-2 Bulkhead Parts For The 8481D Model

    Bulkhead Assemblies Table B-2 Bulkhead parts for the 8481D model Sensor model Reference Part description designator 8481D Connector Nut 5021-7255 Connector Component 1250-0016 Connector Body 1250-2132 Contact Assembly 1250-0917 Insulator 5040-0306 Center Conductor - Cartridge Adapter 5020-3296 Compression Spring 1460-0977 Sliding Contact 5020-3297 Adapter Connector...

  • Page 86: Table B-3 Bulkhead Parts For The 8481H And 8482H Models

    Bulkhead Assemblies Table B-3 Bulkhead parts for the 8481H and 8482H models Sensor model Reference Part description designator 8481H 8482H Connector Nut 5021-7255 5021-7255 Connector Component 1250-0016 1250-0016 Connector Body 1250-2132 1250-2132 Contact Assembly 1250-0917 1250-0917 Insulator 5040-0306 5040-0306 Center Conductor - Cartridge Adapter 5020-3296 5020-3296 Compression Spring...

  • Page 87: Table B-4 Bulkhead Parts For The 8483A Model

    Bulkhead Assemblies Table B-3 Bulkhead parts for the 8481H and 8482H models Sensor model Reference Part description designator 8481H 8482H MP25 Inner Conductor Spacer 5020-8540 or 08742-0005 5020-8540 or 08742-0005 MP26 Flat Washer 2190-0831 or 3050-0622 Cartridge 08481-60042 08482-60019 Cartridge Assembly 08481-60011 08481-60011 Table B-4...

  • Page 88: Table B-5 Bulkhead Parts For The 8485A And 8485D Models

    Bulkhead Assemblies Table B-5 Bulkhead parts for the 8485A and 8485D models Sensor model Reference Part description 8485A 8485D designator 8485A Opt 033 8485D Opt 033 Connector Nut 08485-20005 08485-20005 Connector Component 1250-0016 1250-0016 Bulkhead 08485-20011 08485-20011 Outer External Coax 5021-7092 5021-7092 Outer Conductor Spacer...

  • Page 89: Table B-6 Bulkhead Parts For The 8487A And 8487D Models

    Bulkhead Assemblies Table B-6 Bulkhead parts for the 8487A and 8487D models Sensor model Reference Part description designator 8487A 8487D Connector Nut 5021-7081 5021-7081 Connector Component 1250-0016 1250-0016 Bulkhead 08487-20001 08487-20001 Outer External Coax 08487-20002 08487-20002 Pin Depth Washer 08487-00001 08487-00001 Center Contact 1250-2115...

  • Page 90: Bulkhead Exploded Graphics

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

  • Page 91: Figure B-2 8481A Option 001

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

  • Page 92: Figure B-3 8482A And 8482B

    Bulkhead Assemblies Figure B-3 8482A and 8482B Keysight 8480 Series Operating and Service Manual...

  • Page 93: Figure B-4 8481D

    Bulkhead Assemblies Figure B-4 8481D Keysight 8480 Series Operating and Service Manual...

  • Page 94: Figure B-5 8481H And 8482H

    Bulkhead Assemblies Figure B-5 8481H and 8482H Keysight 8480 Series Operating and Service Manual...

  • Page 95: Figure B-6 8483A

    Bulkhead Assemblies Figure B-6 8483A Keysight 8480 Series Operating and Service Manual...

  • Page 96: Figure B-7 8485A, 8485A Opt 033, 8485D, And 8485D Opt 033

    Bulkhead Assemblies Figure B-7 8485A, 8485A Opt 033, 8485D, and 8485D Opt 033 Keysight 8480 Series Operating and Service Manual...

  • Page 97: Figure B-8 8487A And 8487D

    Bulkhead Assemblies Figure B-8 8487A and 8487D Keysight 8480 Series Operating and Service Manual...
  • Page 98 Bulkhead Assemblies THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight 8480 Series Operating and Service Manual...
  • Page 99 This information is subject 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* 08481-90173 www.keysight.com...

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