Keysight Technologies P Series Service Manual
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Keysight Technologies P Series Service Manual

Keysight Technologies P Series Service Manual

Modular power meter
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Keysight N8262A P-Series
Modular Power Meter
Service Guide

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Summary of Contents for Keysight Technologies P Series

  • Page 1 Keysight N8262A P-Series Modular Power Meter Service Guide...
  • Page 2 DOCUMENT IS PROVIDED “AS IS,” sition Regulation (“FAR”) 2.101. Pursu- AND IS SUBJECT TO BEING © Keysight Technologies 2007 - 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: Certification

    Certification Keysight Technologies certifies that this product met its published specifications at the time of shipment. Keysight further certifies that its calibration measurements are traceable to the United States National Institute of Standard and Technology (formerly National Bureau of Standards), to the extent allowed by that organization’s calibration facility, and to the calibration facilities of other...

  • Page 4: Safety Summary

    Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and intended use of the instrument. Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements.

  • Page 5: Safety Symbols

    Safety Symbols The following symbols on the instrument and in the documentation indicate precautions which must be taken to maintain safe operation of the instrument. Direct current (DC) Alternating current (AC) Off (mains supply) On (mains supply) Caution, risk of danger (refer to this Caution, risk of electric shock manual for specific Warning or Caution information)

  • Page 6: Safety Considerations

    Safety Considerations Read the information below before using this instrument. The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards for design, manufacture, and intended use of the instrument.

  • Page 7: General Safety Information

    REMOVE POWER and do not use the product until safe operation can be verified by service-trained personnel. If necessary, return the product to a Keysight Technologies Sales and Service Office for service and repair to ensure the safety features are maintained.
  • Page 8 – Applying excessive voltage or overloading the device will cause CAUTION irreversible damage to the circuitry. – Use the device with the cables provided. Keysight N8262A Service Guide...

  • Page 9: Environmental Conditions

    Environmental Conditions The N8262A is designed for indoor use and in an area with low condensation. The table below shows the general environmental requirements for this instrument. Environmental cond ition Requirement Operating condition – 0 °C to 55 °C Temperature Storage condition –...

  • Page 10: Regulatory Information

    Regulatory Information The N8262A complies with the following safety and Electromagnetic Compatibility (EMC) compliances: Safety compliance – EN61010-1: 2001/IEC 1010-1:2001 – EN 55011:1991 – EN 55011:1991 – IEC 61326-1:1997+A1:1998/EN 61326-1:1997+A1:1998 – CISPR 11:1990/EN 55011:1991 – Canada: CSA C22.2 No. 61010- 1:2004 –...

  • Page 11: Regulatory Markings

    Regulatory Markings The CSA mark is a registered Industrial, Scientific and Medical trademark of the Canadian Equipment does not exceed 400GHz. Standards Association. ICES/NMB-001 indicates that this ISM The RCM mark is a registered device complies with the trademark of the Australian Canadian ICES-001.

  • Page 12: Waste Electrical And Electronic Equipment (Weee) Directive 2002/96/Ec

    Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC This instrument complies with the WEEE Directive (2002/96/EC) marking requirement. This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste. Product category With reference to the equipment types in the WEEE directive Annex 1, this instrument is classified as a “Monitoring and Control Instrument”...

  • Page 13: Table Of Contents

    Table of Contents Certification ..........3 Limitation of Warranty .
  • Page 14 Physical characteristics ........33 1 mW Power Reference .
  • Page 15 Test method ..........50 Linearity (Average Path) .
  • Page 16 Introduction ..........72 Power-Up Problems .
  • Page 17 ......118 Before Calling Keysight Technologies ......119 Check the Basics .
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  • Page 19 List of Figures Figure 1-1 Measured rise time percentage error versus signal under test rise time ......29 Figure 1-2 N192XA error in peak-to-average measurements for a two-tone input (High, Medium, Low, and Off filters)
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  • Page 21 List of Tables Table 1-1 Dynamic response - rise time, fall time, and overshoot ver- sus video bandwidth settings ....37 Keysight N8262A Service Guide...
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  • Page 23 Keysight N8262A P-Series Modular Power Meter Service Guide Specifications Introduction Specification Definitions General Features P-Series Modular Power Meter and Sensor P-Series Modular Power Meter Specifications P-Series Wideband Power Sensor Specifications Sensor Calibration Uncertainty 1 mW Power Reference System Specifications and Characteristics Characteristics Peak Flatness This chapter lists the power meter’s specifications and describes how to interpret these specifications.

  • Page 24: Specifications

    Specifications Introduction This chapter details the power meter’s specifications and supplemental characteristics Specifications describe the warranted performance and apply after a 30 minute warm-up. These specifications are valid over the power meter’s operating and environmental range unless otherwise stated and after performing a zero and calibration.

  • Page 25: Specification Definitions

    Specifications Specification Definitions There are two types of product specifications: Warranted specifications are specifications which are covered by the product warranty and apply over 0 to 55½ C unless otherwise noted. Warranted specifications include measurement uncertainty calculated with a 95% confidence.

  • Page 26: Conditions

    Specifications Conditions The power meter and sensor will meet its specifications when: – stored for a minimum of two hours at a stable temperature within the operating temperature range, and turned on for at least 30 minutes; – the power meter and sensor are within their recommended calibration period; –...

  • Page 27: General Features

    Specifications General Features Number of channels Dual channel N1921A P-Series Wideband Power Sensor, 50 MHz to 18 GHz Frequency range N1922A P-Series Wideband Power Sensor, 50 MHz to 40 GHz Average, peak and peak-to-average ratio power measurements are provided with free-run or time gate definition. Measurements Time parameter measurements of pulse rise time, fall time, pulse width, time to positive occurrence, and time to negative occurrence...

  • Page 28: P-Series Modular Power Meter And Sensor

    Specifications P-Series Modular Power Meter and Sensor Key system specifications and characteristics Maximum sampling rate 100 Msamples/sec, continuous sampling  Video band wid th 30 MHz  Single shot band wid th 30 MHz Rise time and fall time 13 ns (for frequencies 500 MHz) , see Figure 1-1 Minimum pulse wid th...
  • Page 29 Specifications Figure 1-1 Measured rise time percentage error versus signal under test rise time Although the rise time specification is 13 ns, this does not mean that the  P-Series modular power meter and sensors combination can accurately measure a signal with a known rise time of 13 ns. The measured rise time is the root sum of the squares (RSS) of the signal under test rise time and the system rise time (13 ns): Measured rise time = ((signal under test rise time)

  • Page 30: P-Series Modular Power Meter Specifications

    Specifications P-Series Modular Power Meter Specifications Meter uncertainty Instrumentation linearity ±0.8% Timebase Timebase range 2 ns to 100 msec/div Accuracy ±10 ppm  Jitter 1 ns Trigger Internal trigger Range –20 to +20 dBm Resolution 0.1 dB Level accuracy ±0.5 dB 160 ns ±...
  • Page 31 Specifications Trigger External TTL trigger output Low to high transition on trigger event High >2.4 V <0.7 V 30 ns ± 10 ns Latency  Impedance  Jitter 5 ns RMS Trigger delay Delay range ±1.0 s, maximum Delay resolution 1% of delay setting, 10 ns maximum Trigger hold-off ...

  • Page 32: P-Series Wideband Power Sensor Specifications

    Specifications P-Series Wideband Power Sensor Specifications The P-Series wideband power sensors are designed for use with the P-Series power sensor only. Sensor model Frequency range Dynamic range Damage level Connector type –35 to +20 dBm +23 dBm (500 MHz) (average power); N1921A 50 MHz to 18 GHz Type N (m)

  • Page 33: Sensor Calibration Uncertainty

    Specifications Sensor Calibration Uncertainty Definition: Uncertainty resulting from non-linearity in the sensor detection and correction process. This can be considered as a combination of traditional linearity, cal factor and temperature specifications, and the uncertainty associated with the internal calibration process. Frequency band N1921A N1922A...

  • Page 34: Mw Power Reference

    Specifications 1 mW Power Reference The 1mW power reference is provided for calibration of E-Series (E4410 and NOTE E9300) and 8480 Series Sensors. The P-Series sensors are automatically calibrated do not need this reference calibration. 1.00 mW (0.0 dBm) - Factory set ±0.4% traceable to the National Power output Physical Laboratory (NPL) UK ±1.2% (0 to 55...

  • Page 35: Rear Panel Inputs/Outputs

    Specifications Rear panel inputs/outputs 10/100 BaseT LAN Interface allow communication with an external controller. Ground Binding post, accepts 4 mm plug or bare-wire connection. Line power 100 to 120 V ± 10% Input voltage range 220 to 240 V ± 10% 50 to 60 Hz ±...

  • Page 36: Physical Characteristics

    Specifications Physical characteristics The following dimensions exclude front and rear panel protrusions: Dimensions 44.2 mm H × 212.6 mm W × 420.3 mm D (1.75 in H × 8.5 in W× 19.63 in D)  Net weight 3.5 kg (7.7 lb) approximately ...

  • Page 37: System Specifications And Characteristics

    Specifications System Specifications and Characteristics The video bandwidth in the meter can be set to High, Medium, Low, and Off. The video bandwidths stated in the table below are not the 3 dB bandwidths, as the video bandwidths are corrected for optimal flatness (except the Off filter). Refer to Figure 1-2 for information on the flatness response.

  • Page 38: Characteristics Peak Flatness

    Specifications Characteristics Peak Flatness The peak flatness is the flatness of a peak-to-average ratio measurement for various tone-separations for an equal magnitude two-tone RF input. Figure 1-2 refers to the relative error in peak-to-average ratio measurements as the tone separation is varied. The measurements were performed at –10 dBm with power sensors with 1.5 m cable lengths.

  • Page 39: Noise And Drift

    Specifications Noise and drift Zero set Measurement Noise per noise (free Sensor model Zeroing Zero drift sample <500 MHz >500 MHz run) No RF on input 200 nW 200 nW N1921A/ 100 nW 2 W 50 nW N1922A RF present 550 nW 200 nW [a] Within 1 hour after a zero, at a constant temperature, after 24 hour warm up of the power meter.
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  • Page 41 Keysight N8262A P-Series Modular Power Meter Service Guide Performance Tests Introduction Complete Equipment List 1 mW Power Reference Level Test Output Standing Wave Ratio (SWR) Test Time Base Frequency Accuracy Zero Set (Average Path) Zero Set (Peak Path) Linearity (Average Path) Absolute Accuracy Test (Average Path) Linearity (Peak Path) Rise/Fall Time (Peak Path)

  • Page 42: Performance Tests

    Performance Tests Introduction The performance tests described in this chapter test the power meter’s electrical performance against the specifications detailed in Chapter 1. They are used for incoming inspection, the calibration cycle (also called periodic maintenance), or after repairs have been made. –...

  • Page 43: Complete Equipment List

    Performance Tests Complete Equipment List Recommended Keysight Al ternative Keysight Instrument Critical specifications model number model number Analyzers N3381A Network analyzer N3383A N3382A 8753ES/ET Counters Frequency: 10 MHz Universal counter 53132A 53131A Gate time: 10 seconds Meters Dual channel Absolute accuracy: ±0.5% Power meter E4419B E4419A...
  • Page 44 Performance Tests Recommended Keysight Al ternative Keysight Instrument Critical specifications model number model number Miscellaneous Devices 10 MHz frequency standard Pulse/Data generator 81130A 81131A output modules (required) Frequency: DC to 6 GHz Insertion loss: 6 to 7 dB, 3 GHz Power splitter (required) 11667A SWR:...

  • Page 45: Mw Power Reference Level Test

    Performance Tests 1 mW Power Reference Level Test Description The 1 mW power reference is used for the calibration of 8480 Series and E-Series power sensors, and is traceable to national standards. This test uses an 8482A power sensor to transfer the power measured on an accurately calibrated E4419B or E4417A power meter to the DUT reference.

  • Page 46: Output Standing Wave Ratio (Swr) Test

    Performance Tests Output Standing Wave Ratio (SWR) Test Description Connector mismatch is the largest single contributor to measurement uncertainty, so this specification must be warranted to provide assurance of instrument accuracy. The 1 mW power reference level test must be carried out prior to this test, as the VSWR specification is only valid at 1 mW.

  • Page 47: Test Method

    Performance Tests Test method 1 Obtain the S11 parameter of the Calibration System. 2 Connect the Measurement System to the Calibration System and obtain its S21 (load) and S21 (open) parameters. 3 Using only the Measurement System, terminated with the OPEN connector from the 85032B calibration kit, measure the 1 mW power reference level of the DUT.

  • Page 48: Time Base Frequency Accuracy

    Performance Tests Time Base Frequency Accuracy Description The accuracy of the 100 MHz sample clock determines the accuracy of all measurements that are based on samples taken over time. This test measures the time base by dividing the sample clock by 10 (within the meter) and feeding it out of the trigger output connector, where it can be directly measured by a frequency counter.

  • Page 49: Zero Set (Average Path)

    Performance Tests Zero Set (Average Path) Description Zero set is defined as the amount of residual offset error that is present following a zero operation. This offset error is caused by contamination from several sources, including circuit noise. This test measures the effectiveness of zero set by performing 15 back-to-back zero operations of the average path (with no sensor attached), after which the standard deviation of the results is calculated and returned as the measured value.

  • Page 50: Zero Set (Peak Path)

    Performance Tests Zero Set (Peak Path) Description Zero set is defined as the amount of residual offset error that is present following a zero operation. This offset error is caused by contamination from several sources, including circuit noise. This test measures the effectiveness of zero set by performing 15 back-to-back zero operations of the peak path (with no sensor attached), after which the standard deviation of the results is calculated and returned as the measured value.

  • Page 51: Linearity (Average Path)

    Performance Tests Linearity (Average Path) Description Linearity over the full input voltage range of the measurement path is warranted to provide assurance of instrument accuracy. This test measures Linearity by using a calibration DAC and a calibration ADC (built into the DUT) to stimulate and compare performance of the Average Path against the measurement ADC, returning the worst case percentage error.

  • Page 52: Absolute Accuracy Test (Average Path)

    Performance Tests Absolute Accuracy Test (Average Path) Description The absolute accuracy test checks the ability of the power meter to accurately measure the power sensor voltage and display the appropriate power level. Equipment – Required test equipment: 1 unit of 3458A digital multimeter 1 unit of 33250A function generator 1 unit of 11683A (Option H01) range calibrator 1 unit of 11730A power sensor cable...

  • Page 53: Test Method

    Performance Tests 11683A range 11683A range calibrator front panel calibrator rear panel BNC T-joint connector N8262A P-Series modular power meter BNC cable BNC cable 3458A digital 33250A function multimeter generator Banana connector Banana connector Figure 2-1 Absolute accuracy test setup For the Keysight N8262A P-Series modular power meter, the equivalent key NOTE presses should be performed on both channels.
  • Page 54 Performance Tests Disconnect the power cord to stop the operation of the range calibrator as the range calibrator will continue to operate with no power applied. When switching the range calibrator to STANDBY, allow enough time for the NOTE range calibrator to settle to its zero value before attempting to zero the Keysight N8262A P-Series modular power meter.
  • Page 55 Performance Tests 11 Perform a power meter zero on the DUT. The voltage of the range calibrator is assumed to be 0 V. 12 Set the DC voltage to 89.6056 mV as measured by the voltmeter. 13 Perform a power meter calibration on the DUT. 14 Measure and record the absolute accuracy of the N8262A in a table as shown below.

  • Page 56: Linearity (Peak Path)

    Performance Tests Linearity (Peak Path) Description Linearity over the full input voltage range of the measurement path is warranted to provide assurance of instrument accuracy. This test measures linearity by using a calibration DAC and a calibration ADC (built into the DUT) to stimulate and compare performance of the Average Path against the measurement ADC, returning the worst case percentage error.

  • Page 57: Rise/Fall Time (Peak Path)

    Performance Tests Rise/Fall Time (Peak Path) Description Linearity over the full input voltage range of the measurement path is warranted to provide assurance of instrument accuracy. This test measures linearity by using a calibration DAC and a calibration ADC (built into the DUT) to stimulate and compare performance of the peak path against the measurement ADC, returning the worst case percentage error.
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  • Page 59 Keysight N8262A P-Series Modular Power Meter Service Guide Adjustments Introduction Power Reference Level Adjustment This chapter contains checks and adjustments that ensure proper performance of the power meter.

  • Page 60: Adjustments

    Adjustments Introduction This chapter attempts to correct the power reference level if the performance test has failed. The power reference level is controlled by the coarse and fine settings of a digital potentiometer. Adjustment of the coarse and fine settings can only be carried out via remote commands.

  • Page 61: Power Reference Level Adjustment

    Adjustments Power Reference Level Adjustment Equipment As per the test equipment list for the 1 mW Power Reference Level Test Test method 1 Set: Coarse = 834, Fine = 550 2 Measure the power ref. level as per the performance test: a If the result is >1 mW, then increment COARSE by 1.
  • Page 62 Adjustments THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight N8262A Service Guide...
  • Page 63 Keysight N8262A P-Series Modular Power Meter Service Guide Theory of Operation PPMC Assembly Mother Board Assembly Measurement Board Assembly Calibrator Assembly Front Panel Assembly PSU Assembly This chapter describes how each of the power meter’s individual assemblies operate.

  • Page 64: Theory Of Operation

    Theory of Operation PPMC Assembly Purpose – Provides the main processor and memory for the power meter – Provides external interfaces for LAN – Stores the power meter firmware in Flash EEPROM – Stores the power meter serial number and option data Inputs –...

  • Page 65: Mother Board Assembly

    Theory of Operation Mother Board Assembly Purpose – Provides the average measurement path(s) – Provides the peak measurement path(s) to the measurement board(s) – Provides external trigger input/output and recorder output(s) – Provides signal routing between the PPMC and measurement board(s) Inputs –...

  • Page 66: Measurement Board Assembly

    Theory of Operation Measurement Board Assembly Purpose – Provides data acquisition and processing for the peak measurement path of a channel Inputs – Power supplies [from PSU, via mother board] – Unprocessed peak path measurement samples [from mother board] – Control, address, and data lines [from PPMC] Outputs –...

  • Page 67: Calibrator Assembly

    Theory of Operation Calibrator Assembly Purpose – Provides a 1 mW (0 dBm) power reference level at 50 MHz Inputs – Power supplies [from PSU, via mother board] – Control, address, and data lines [from PPMC] Outputs – 1 mW (0 dBm) power reference [to external equipment] –...

  • Page 68: Front Panel Assembly

    Theory of Operation Front Panel Assembly Purpose – Provides mounting for the channel A and B sensor flex, rocker switch, LED, recorder output, trigger in/out, and power reference connector Inputs – Power supplies [from PSU, via mother board] – Front panel board assembly Outputs –...

  • Page 69: Psu Assembly

    Theory of Operation PSU Assembly Purpose: – Provides various DC power supplies Inputs: – 100 Vac ~ 240 Vac, 50 Hz ~ 60 Hz, 150 VA max [from an external source] – Control lines [from front panel, via mother board] Outputs: –...
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  • Page 71: Troubleshooting Guide

    Keysight N8262A P-Series Modular Power Meter Service Guide Troubleshooting Guide Introduction Power-Up Problems Instrument Self-Test Extended Self-Test Performance Test Power Reference Level Adjustment Problems Communication Interface Failures Additional Diagnostic Tests This chapter contains troubleshooting flow charts designed to isolate faults in the LAN interface port.

  • Page 72: Introduction

    Troubleshooting Guide Introduction This chapter enables qualified service personnel to diagnose suspected faults with the power meter LAN interface port. If there is a problem when attempting to use the LAN interface function, consult the User’s Guide and confirm that all the user setups are correct before proceeding with the following fault finding flowcharts.

  • Page 73: Power-Up Problems

    Troubleshooting Guide Power-Up Problems Basic external checks – Check that the mains power source is live – Check the mains cable for any obvious damage Basic internal checks – Check/reseat the cable between the line module and the PSU – Check/reseat the cable between the PSU and the mother board –...

  • Page 74: Instrument Self-Test

    Troubleshooting Guide Instrument Self-Test Instrument Purpose Debug tips Possible faul ts – PSU (low probability) Checks that all of the supply Replace the PSU to see if this Test point voltages – Mother board (high voltages are present clears the faults probability) –...
  • Page 75 Troubleshooting Guide Instrument Purpose Debug tips Possible faul ts – Measurement board Executes an internal self-test assembly, channel A (high Replace the measurement ChA measurement board procedure on the probability) board assembly for channel A check measurement board assembly to see if this clears the fault –...

  • Page 76: Extended Self-Test

    Troubleshooting Guide Extended Self-Test Instrument Purpose Debug tips Possible faul ts – Check that the SMB cable being used is not damaged Provides a means to measure Time base Mother board – Check that the SMB is time base frequency accuracy connected to ‘Trig Out’...

  • Page 77: Performance Test

    Troubleshooting Guide Performance Test Type of failures Debug tips Possible faul ts Calibrator Assembly (high 1 mW power reference level Attempt to adjust the 1 mW probability) failures Power Reference Level Mother Board (low probability) VSWR failures Not applicable Calibrator Assembly –...

  • Page 78: Power Reference Level Adjustment Problems

    Troubleshooting Guide Power Reference Level Adjustment Problems Possible faults – Calibrator assembly (high probability) – Mother board (low probability) Keysight N8262A Service Guide...

  • Page 79: Communication Interface Failures

    Troubleshooting Guide Communication Interface Failures Type of communication Debug tips Possible faul ts Check visually to see whether or LAN communication not the connector is obstructed/ PPMC assembly damaged Keysight N8262A Service Guide...

  • Page 80: Additional Diagnostic Tests

    Troubleshooting Guide Additional Diagnostic Tests Type of functionality Reason Recommended test method Possible faul ts The N7832A software does not Connect an E4412A sensor to Sensor functionality prove both paths of the sensor the DUT and ensure it can be Sensor flex assembly flex assembly zeroed/calibrated...
  • Page 81 Keysight N8262A P-Series Modular Power Meter Service Guide Repair Guide Introduction Replaceable Parts Required Torque Values for Fasteners Disassembly Instructions Reassembly Instructions Additional Repair Notes Replacing the PPMC Assembly This chapter details the power meter’s replaceable parts. It also explains how to assemble and disassemble the power meter.

  • Page 82: Repair Guide

    Repair Guide Introduction This chapter contains details of some of the higher level components and assemblies, which can be ordered from Keysight Technologies. It also details how to assemble and disassemble the power meter for repair. The contents included are:...

  • Page 83: Replaceable Parts

    Repair Guide Replaceable Parts Front panel assembly Front panel assembly can be available Main assembly The standard P-Series modular power meter has the reference calibrator (semi-rigid reference cable), rocker switch, recorder cable, trigger in/out cable, channel A/B sensor flex assembly at the front panel. Keysight part number Description Visual...
  • Page 84 Repair Guide Keysight part number Description Visual N8262-63002 Front panel board assembly Channel A and B sensor flex assembly Note: The same assembly is used for all two sensor positions. The sensor flex assembly is supplied straight, and so it must be folded to match the N8262-60206 assembly being replaced (see “Additional...
  • Page 85 Repair Guide Keysight part number Description Visual N8262-60208 Trigger in/out cable Power reference input Note: N8262-20101 Power reference input is not included with front panel assembly, part number N8262-60107; if this is required, it is available as a separate item. Keysight N8262A Service Guide...

  • Page 86: Mother Board Assembly

    Repair Guide Mother board assembly Keysight part number Description Visual N8262-63001 PCA, mother board assembly PPMC (processor PCI mezzanine) assembly Keysight part number Description Visual PPMC assembly Note: Refurbished PPMC assemblies are not available. The PPMC assembly must be N8200-60002 programmed once it has been installed (see “Additional Repair Notes”...

  • Page 87: Measurement Board Assembly

    Repair Guide Measurement board assembly Keysight part number Description Visual Measurement board N1912-60004 Note: There are two identical measurement board in the N8262A P-Series modular power meter. Keysight N8262A Service Guide...

  • Page 88: Psu (Power Supply Unit)

    Repair Guide PSU (power supply unit) Keysight part number Description Visual 0950-5146 Note: Refurbished PSUs are not available. N8262-60202 Power supply cable assembly Keysight N8262A Service Guide...

  • Page 89: Calibrator Assembly

    Repair Guide Calibrator assembly Keysight part number Description Visual Top view N1911-61002 Calibrator assembly Bottom view N8262-6021 Calibrator cable assembly Keysight N8262A Service Guide...

  • Page 90: Required Torque Values For Fasteners

    Repair Guide Required Torque Values for Fasteners Required tools and torque values for fasteners are listed below: Item Description/Defaul t Range of values – Fit mother board to chassis – Fit front frame to chassis T20 Torx screwdriver bit 21 in Ibs –...

  • Page 91: Disassembly Instructions

    Repair Guide Disassembly Instructions The guidelines in this section describe the disassembly of four major assembling in the Keysight N8262A P-Series modular power meter. – Front panel disassembly – Calibrator disassembly – Power supply disassembly – Mother board, measurement board, and PPMC board disassembly Location of replaceable parts Calibration Board Assembly Calibration Board Assembly...
  • Page 92 Repair Guide P o w er S up p ly C a ble A ssem b ly P o w er S up p ly C a ble A ssem b ly F a n W ire F a n W ire R e cord e r 1 &...

  • Page 93: Front Panel Disassembly Instructions

    Repair Guide Front panel disassembly instructions Instructions Visual Use the T10 Torx screwdriver bit to remove the four captive screws and remove the bumper foot. Note: You need to remove the bumper foot first before removing the cover. Keysight N8262A Service Guide...
  • Page 94 Repair Guide Instructions Visual – Use a T20 Torx screwdriver bit to remove the four screws located at the rear panel. – Pull and remove the cover at the rear panel. See the figure to the right for more details. –...
  • Page 95 Repair Guide Instructions Visual – Use a T8 Torx screwdriver bit to remove the eight screws, which holds the measurement board assembly. See the figure to the right for more details. – Lift and remove the measurement board assembly. Lift and remove recorder 1 cable and recorder 2 cable from J31 and J30 respectively on the mother board assembly.
  • Page 96 Repair Guide Instructions Visual – Step 1: Lift and remove the top coaxial cable labeled 2 (channel B) from J2. – Step 2: Lift and remove the bottom coaxial cable labeled 3 (channel B) from J3. – Step 3: Lift and remove the top coaxial cable labeled 4 (channel A) from J4.
  • Page 97 Repair Guide Instructions Visual – Remove the power reference input connector (see the figure to the right): – Use the 19 mm socket to remove the nut on the power reference input connector on the front panel. Use a T20 Torx screwdriver bit to remove the four screws (located at both side of the front panel), which holds the front frame to the chassis.
  • Page 98 Repair Guide Instructions Visual – Step 1: Disconnect the ribbon cable, which connects the front panel board assembly to the rocker switch. – Step 2: Pull and remove the LED wire from the front panel board assembly. Take out the six coaxial cables through the hole in the chassis carefully.
  • Page 99 Repair Guide Instructions Visual Use a T10 Torx screwdriver bit to remove the two screws (as shown in the figure to the right), which holds the rocker switch board assembly. Note: You will be able to take out the rocker switch assembly during this step.
  • Page 100 Repair Guide Instructions Visual Disconnect the ribbon cable, which connects the mother board assembly and front panel board assembly. Use a T10 Torx screwdriver bit to remove the two screws, which holds the front panel board assembly to the chassis. Note: You will be able to remove the front panel board assembly during this step.
  • Page 101 Repair Guide Instructions Visual – Disconnect the fan assembly (as shown in the figure to the right) – Use a T10 Torx screwdriver bit to remove the four screws, remove the fan guard, and disconnect the fan assembly. Note: You may use the same method to disconnect all the fan assemblies.

  • Page 102: Calibrator Disassembly Instructions

    Repair Guide Calibrator disassembly instructions Instructions Visual Use a 10 Torx screwdriver bit to remove the four captive screws and remove the bottom feet. Note: You need to remove the bumper foot first before removing the cover. – Use a T20 Torx screwdriver bit to remove four screws located at the rear panel.
  • Page 103 Repair Guide Instructions Visual Use a T6 Torx screwdriver bit to remove the three screws located on the bottom of the chassis. Use the 5/16” spanner to disconnect the power reference input from the calibrator assembly. Note: You will be able to remove the calibrator assembly at this step.

  • Page 104: Power Supply Disassembly Instructions

    Repair Guide Power supply disassembly instructions Instructions Visual Use a T10 Torx screwdriver bit to remove the four captive screws and remove the bumper foot. Note: You need to remove the bottom feet first before removing the cover. – Use a T20 Torx screwdriver bit to remove four screws located at the rear panel.
  • Page 105 Repair Guide Instructions Visual Lift and remove the line module from the power supply unit. See the figure to the right for more details. – Use a T10 Torx screwdriver bit to remove the screw, and remove the lug from the power supply unit.
  • Page 106 Repair Guide Instructions Visual – Step 1: Lift and remove the power supply cable assembly from the mother board assembly. – Step 2: Lift and remove the power supply unit. Disconnect the power supply cable assembly from the power supply unit. Lift and remove the power supply cable assembly from the power supply.

  • Page 107: Mother Board, Measurement Board, And Ppmc Board Disassembly Instructions

    Repair Guide Mother board, measurement board, and PPMC board disassembly instructions Instructions Visual Use a T10 Torx screwdriver bit to remove the four captive screws and remove the bumper foot. Note: You need to remove the bumper foot first before removing the cover.
  • Page 108 Repair Guide Instructions Visual Use a T8 Torx screwdriver bit to remove the four screws. Lift and remove PPMC assembly from the mother board assembly. – Step 1: Lift and remove recorder 1 and recorder 2 from J31 and J30, which are located on the mother board assembly.
  • Page 109 Repair Guide Instructions Visual – Step 1: Lift and remove channel B flex cable from J23. – Step 2: Lift and remove channel A flex cable from J18. – Use a T8 Torx screwdriver bit to remove the eight screws, which holds the measurement to the mother board.
  • Page 110 Repair Guide Instructions Visual Lift and remove calibrator cable assembly from the mother board assembly at J8. – Step 1: Lift and remove the coaxial cable labeled 1 (trig. in) from P1. – Step 2: Lift and remove the coaxial cable labeled 2 (trig.
  • Page 111 Repair Guide Instructions Visual Use a 1.5 Hex Allen tool to disconnect the trigger board from the mother board assembly. Remove all the locks and flat washers. Note: You will be able to remove the trigger interface board assembly at this step. –...
  • Page 112 Repair Guide Instructions Visual Disconnect the fan wire connector from the mother board assembly. Lift and remove the fan wire from the chassis wall. – Pull and remove the ribbon cable, which is connected from the mother board assembly to the front panel board. –...

  • Page 113: Reassembly Instructions

    Repair Guide Reassembly Instructions Instructions Visual – The reassembly process is simply the reverse of the disassembly process. However, there are various points to be aware of: – Make sure the ribbon cable is shaped as in the figure to the right when you connect a new front panel board ribbon cable.
  • Page 114 Repair Guide Instructions Visual – When connecting a new calibrator, make sure that you have remove the metal gasket by removing the attached screws using a T6 Torx screwdriver bit. – After removing the metal gasket, place back the screws to original position. Note: The new calibrator comes with a metal gasket.

  • Page 115: Additional Repair Notes

    Repair Guide Additional Repair Notes Replacing a sensor flex assembly: – The Sensor Flex Assembly is supplied straight. – Create a sharp bend (Figure 6-4): The flex circuit must be bent at a right-angle where it meets the printed circuit board. It can only be bent after heat has been applied to it (i.e.

  • Page 116: Replacing The Ppmc Assembly

    Repair Guide Replacing the PPMC Assembly – The PPMC Assembly is pre-programmed with N8262A firmware. – Always perform a firmware update to the instrument if the PPMC assembly has been replaced. – Instrument serial number: This can be stored in the PPMC assembly via the command: SERV: SNUM <CHARACTER DATA>...
  • Page 117 Keysight N8262A P-Series Modular Power Meter Service Guide Contacting Keysight Technologies Introduction Before Calling Keysight Technologies Check the Basics Instrument Serial Numbers Returning Your Power Meter for Service Useful Web Pages This chapter details what to do if you have a problem with your power meter.

  • Page 118: Introduction

    Keysight Technologies. This section contains a checklist that helps identify some of the most common problems. If you wish to contact Keysight Technologies to enquire about the N8262A P-Series modular power meter, from service problems to ordering information, refer to “Sales and Technical Support”...

  • Page 119: Before Calling Keysight Technologies

    Contacting Keysight Technologies Before Calling Keysight Technologies Before calling Keysight Technologies or returning the power meter for service, please make the checks listed in “Check the Basics” on page 120. If your power meter is covered by a separate maintenance agreement, please be familiar with the terms.

  • Page 120: Check The Basics

    Contacting Keysight Technologies Check the Basics Problems can be solved by repeating what was being performed when the problem occurred. A few minutes spent in performing these simple checks may eliminate time spent waiting for instrument repair. Before calling Keysight...

  • Page 121: Instrument Serial Numbers

    *IDN? – From the serial number label. The serial number label is attached to the bottom of each Keysight Technologies instrument. This label has two instrument identification entries. The first provides the instruments serial number and the second provides the identification number for each option built into the instrument.

  • Page 122: Returning Your Power Meter For Service

    Use the information in this section if you need to return your power meter to Keysight Technologies. Packaging the power meter for shipment to Keysight Technologies for service – Fill in a blue service tag (available at the end of most hardcopy Keysight Service Guides) and attach it to the power meter.
  • Page 123 Contacting Keysight Technologies – Mark the shipping container “FRAGILE, HANDLE WITH CARE” to ensure careful handling. – Retain copies of all shipping papers. Keysight N8262A Service Guide...

  • Page 124: Useful Web Pages

    Contacting Keysight Technologies Useful Web Pages – Main Product Page www.keysight.com/find/powermeter – Performance Test & Calibration Software www.cal.software.keysight.com Keysight N8262A Service Guide...
  • Page 125 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 2007 - 2017 Edition 7, July 3, 2017 Printed in Malaysia *N8262-90004* N8262-90004 www.keysight.com...

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N8262a

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