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

Power meters
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Keysight N1911A/1912A
P-Series Power Meters
Service Guide

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  • Page 1 Keysight N1911A/1912A P-Series Power Meters Service Guide...
  • Page 2 Federal Acqui- DOCUMENT IS PROVIDED “AS IS,” sition Regulation (“FAR”) 2.101. Pursu- AND IS SUBJECT TO BEING © Keysight Technologies 2006-2017 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 from the factory. Keysight Technologies further certifies that its calibration measurements are traceable to the United States National Institute of Standard and Technology, to the extent allowed by the Institute’s...

  • Page 4: Equipment Operation

    Equipment Operation Personal safety considerations This is a Safety Class I product (provided with a protective earthing ground incorporated in the power cord). The mains plug shall only be inserted in a socket outlet provided with a protective earth contact. Any interruption of the protective conductor, inside or outside the instrument, is likely to make the instrument dangerous.

  • 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. Caution, risk of danger (refer to this manual for specific Warning or Caution Alternating current (AC) information) This symbol indicates the operating switch for ‘Stand-by’...

  • Page 6: General Safety Considerations

    Any adjustments or service procedures that require operation of the CAUTION instrument with protective covers removed should be performed only by trained service personnel. Recommended Calibration Interval Keysight Technologies recommends a two years calibration cycle for the N1911A and N1912A P-Series power meter. Keysight N1911A/1912A Service Guide...

  • Page 7: Environmental Conditions

    Environmental Conditions This instrument is designed for indoor use. 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 – –40 °C to 70 °C Operating condition –...

  • Page 8: Regulatory Information

    Regulatory Information The N1911A/1912A P-Series power meters comply with the following safety and Electromagnetic Compatibility (EMC) compliances: Safety compliance – IEC 61010-1:2010/EN 61010-1:2010 (3rd Edition) – Canada: CAN/CSA-C22.2 No. 61010-1-12 – USA: ANSI/UL 61010-1 (3rd Edition) EMC compliance – IEC 61326-1:2005/EN 61326-1:2006 –...

  • Page 9: 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. ICES/NMB-001 indicates that this ISM The CSA mark is a registered device complies with the trademark of the Canadian Canadian ICES-001.

  • Page 10: 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 11: Table Of Contents

    Table of Contents Certification ..........3 Limitation of Warranty .
  • Page 12 Test method ..........27 Time Base Frequency Accuracy .
  • Page 13 DAP Assembly ..........44 Calibrator Assembly .
  • Page 14 ......114 Before Calling Keysight Technologies ......115 Check the Basics .
  • Page 15 List of Figures Figure 2-1 1 mW power reference level test setup connection diagram ........23 Figure 2-2 System calibration connection diagram .
  • Page 16 THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight N1911A/1912A Service Guide...
  • Page 17 Keysight N1911A/1912A P-Series Power Meters Service Guide Specifications Specifications and Characteristics This chapter provides the power meter’s specifications.

  • Page 18: Specifications

    Specifications Specifications and Characteristics For the characteristics and specifications of the N1911A/1912A, refer to the data sheet at http://literature.cdn.keysight.com/litweb/pdf/5989-2471EN.pdf. Keysight N1911A/1912A Service Guide...
  • Page 19 Keysight N1911A/1912A P-Series Power Meters 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 20: 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 21: Complete Equipment List

    Performance Tests Complete Equipment List Recommended Keysight Al ternative Keysight model Instrument Critical specifications model number 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 reference accuracy: ±0.9% —...
  • Page 22 Performance Tests Recommended Keysight Al ternative Keysight model Instrument Critical specifications model number number Attenuators 20 dB fixed attenuator Type-N (m,f) 8491A (Option 020) 30 dB fixed attenuator Type-N (m,f) 11708A Miscellaneous devices 10 MHz frequency standard Pulse/data generator 81131A output modules 81130A required Frequency: DC to 6 GHz...

  • Page 23: 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, N8480 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 24: Test Method

    Performance Tests Test method 1 Enter the recorded measurement uncertainty of the E4419B or E4417A 1 mW power reference 2 Using the E4419B or E4417A power meter and the 8482A sensor, measure the 1mW power reference of the E4419B or E4417A 3 Using the E4419B or E4417A power meter and the 8482A sensor, measure the 1 mW power reference of the DUT 4 Using all of these values, the N7832A software will calculate the power...

  • Page 25: 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 26 Performance Tests TYPE N MALE PORT Load port 20 dB ATTENUATOR POWER POWER METER SPLITTERS POWER SENSOR CH A CH B 30 dB ATTENUATOR Figure 2-2 System calibration connection diagram P-SERIES POWER METER POWER METER Ch A 20 dB ATTENUATOR Load port TYPE-N POWER SENSOR...

  • Page 27: Test Method

    Performance Tests For rear panel options, the connections will differ from the illustration shown NOTE here. Refer to the connector identification markings on the rear panel for further details. 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.

  • Page 28: 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 29: Test Method

    Performance Tests Test method 1 Enable the path that routes the time base signal to the trigger output connector. 2 Using the 53132A, measure the frequency of the signal at the trigger output connector. – This test can be configured manually via the command NOTE SERV:BIST:TBAS:STAT ON, which enables the 10 MHz feed to the trigger output connector (refer to the programming guide for further details on the...

  • Page 30: 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 31: 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 32: Linearity (Average Path)

    Performance Tests Linearity (Average Path) Description Linearity over the full input voltage range of the measurement path iswarranted 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 33: 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 34: Test Method

    Performance Tests 11683A range 11683A range calibrator rear panel calibrator front panel BNC T-joint connector N1911/1912A P-Series power meter BNC cable BNC cable 3458A digital 33250A function multimeter generator Banana connector Banana connector Figure 2-6 Absolute accuracy test setup The procedure details the key presses required on the Keysight N1911A P-Series NOTE power meter.
  • Page 35 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 N1911A/1912A P-Series power meter.
  • Page 36 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 N1911A/1912A in a table as shown below.

  • Page 37: 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 peak path against the measurement ADC, returning the worst case percentage error.

  • Page 38: Rise/Fall Time (Peak Path)

    Performance Tests Rise/Fall Time (Peak Path) Description The rise and fall time performance of the instrument path has to be quantified accurately. The 81130A pulse generator is used to supply the appropriate pulse with defined rise and fall time. The instrument measures and processes the known signal which is then compared with defined acceptance limits.

  • Page 39: Test Method

    Performance Tests For rear panel options, the connections will differ from the illustration shown NOTE here. Refer to the connector identification markings on the rear panel for further details. Test method 1 Capture a train of 10 pulses with very fast rise/fall times. 2 Combine the sample data to create an equivalent pulse with 10 unit of the sample resolution of the DUT.
  • Page 40 Performance Tests THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight N1911A/1912A Service Guide...
  • Page 41 Keysight N1911A/1912A P-Series Power Meters Service Guide Theory of Operation PPMC Assembly Main Board Assembly DAP Assembly Calibrator Assembly Front Panel Assembly PSU Assembly This chapter describes how each of the power meter’s individual assemblies operate.

  • Page 42: Theory Of Operation

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

  • Page 43: Main Board Assembly

    Theory of Operation Main Board Assembly Purpose – Provides the average measurement path(s) – Provides the peak measurement path(s) to the DAP(s) – Provides external trigger input/ output and recorder output(s) – Provides the driver and the LVDS serialiser for the LCD display –...

  • Page 44: Dap Assembly

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

  • Page 45: 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 main board] – Control, address, and data lines [from PPMC] Outputs – 1 mW (0 dBm) power reference [to external equipment] –...

  • Page 46: Front Panel Assembly

    Theory of Operation Front Panel Assembly Purpose – Provides a keyboard as the manual user interface – Provides an LCD display to assist with manual setups and measurements – Provides mounting for the sensor and power reference connectors (option 101) Inputs –...

  • Page 47: 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 main board] Outputs –...
  • Page 48 Theory of Operation THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight N1911A/1912A Service Guide...
  • Page 49 Keysight N1911A/1912A P-Series Power Meters 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 Rmt I/O, GP-IB and RS232/422 interface ports.

  • Page 50: Troubleshooting Guide

    Troubleshooting Guide Introduction This chapter enables qualified service personnel to diagnose suspected faults with the power meter Rmt I/O (Remote Input/Output) signal lines and RS232/422 serial port. If there is a problem when attempting to use the RS232/422 serial interface or the remote I/O functions, consult the user’s guide and confirm that all the user setups are correct before proceeding with the following fault finding flowcharts.

  • Page 51: Power-Up Problems

    Troubleshooting Guide Power-Up Problems Basic external checks – Check the mains power source is live – Check the mains fuse is operational – Check the mains cable for any obvious damage – Check the line module fuse in the instrument is operational Basic internal checks –...

  • Page 52: 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 voltages are present clears the faults Main board (high probability) Verifies that the calibrator is Check/reseat that cable working...
  • Page 53 Troubleshooting Guide Instrument Purpose Debug tips Possible faul ts Verifies that the peak path of Replace the DAP assembly for channel B is working DAP assembly, channel B (low channel B to see if this clears probability) ChB peak path (Note: This does not prove that the fault the peak path meets its...

  • Page 54: Extended Self-Test

    Troubleshooting Guide Extended Self-Test Instrument Purpose Debug tips Possible faul ts Verifies the operation of every Front panel (defective keymat Keyboard key (apart from the power Not applicable or key flex circuit) button) Verifies that all pixels in the Front panel (defective display, Bitmap display display can be illuminated in Not applicable...

  • Page 55: 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 Main board (low probability) VSWR failures Not applicable Calibrator assembly Check that the BNC cable being used is not damaged Time base frequency accuracy...

  • Page 56: Power Reference Level Adjustment Problems

    Troubleshooting Guide Power Reference Level Adjustment Problems Possible faults – Calibrator assembly (high probability) – Main board (low probability) Keysight N1911A/1912A Service Guide...

  • Page 57: Communication Interface Failures

    Troubleshooting Guide Communication Interface Failures Type of communication Debug tips Possible faul ts Ribbon cable (low probability) Check/reseat the ribbon cable PPMC assembly (low probability) GPIB communication connecting the PPMC to the main board Main board (high probability) Check visually to see whether or LAN/USB communication not the connector is PPMC assembly...

  • Page 58: Additional Diagnostic Tests

    Troubleshooting Guide Additional Diagnostic Tests Type of functionality Reason Recommended test method Possible faul ts Check the DUT responds when The N7832A software only tests USB/LAN functionality *RST is sent to it via the USB/LAN PPMC assembly functionality over GPIB interfaces The N7832A software does not Connect an E4412A sensor to the...

  • Page 59: Repair Guide

    Keysight N1911A/1912A P-Series Power Meters Service Guide Repair Guide Introduction Replaceable Parts Tools Required Required Torque Values for Fasteners Disassembly Instructions Reassembly Instructions Disassembly vs Part Replacement Front Panel Disassembly Instructions Front Panel Reassembly Instructions Additional Repair Notes Replacing the PPMC Assembly Replacing the Calibrator Semi-Rigid/Split Ferrite This chapter details the power meter’s replaceable parts.

  • Page 60: Introduction

    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 61: Replaceable Parts

    Repair Guide Replaceable Parts Front panel assembly Main assembly The standard P-Series power meter has the reference calibrator at the front panel. Option is available to move the reference calibrator to rear panel. Keysight part Description Visual number N1912-61804 Front panel assembly (front calibrator option) Front panel assembly (rear calibrator option) Note: N1912-61805...
  • Page 62 Repair Guide Customization details The standard P-Series power meters have the input sensor connector(s) and reference calibrator connector on the front panel. Option 003 is available to move the input sensor connector(s) and reference calibrator connector to the rear panel. Below are the customization details on front panel assembly.
  • Page 63 Repair Guide Customization parts Keysight part Description Visual number Sensor flex assembly Note: – The same assembly is used for all four sensor positions – The kit includes a spacer, required for fitting N1912-61806 the flex to the rear panel –...
  • Page 64 Repair Guide Keysight part Description Visual number N1912-00025 N1912-00025 Blank front panel dress label N1912-00026 N1912-00026 N1911A front panel dress label N1912-00027 N1912A front panel dress label N1912-00027 N1911-80001 N1911-80001 N1911A nameplate N1912-80003 N1912A nameplate N1912-80003 Keysight N1911A/1912A Service Guide...
  • Page 65 Repair Guide Replaceable parts Keysight part Description Visual number Front panel sub-frame Note: N1912-40003 – This front panel sub-frame is used on all variants of the front panel assembly Display support molding Note: N1912-40002 – This display support molding is used on all variants of the front panel assembly Keymat Note:...
  • Page 66 Repair Guide Keysight part Description Visual number Key flex circuit Note: N1912-66502 – This key flex circuit is used on all variants of the front panel assembly EMI shielded window Note: N1912-20005 – This EMI shielded window is used on all variants of the front panel assembly EMI screen Note:...
  • Page 67 Repair Guide Keysight part Description Visual number Display Front view Note: 2090-1101 – This display is used on all variants of the front panel assembly and must be ordered together with the DC to DC converter (0950-5724) Rear view Display interface board Note: N1912-60002 –...
  • Page 68 Repair Guide Keysight part Description Visual number DC to DC converter Note: 0950-5724 – This DC to DC converter is used on all variants of the front panel assembly and must be ordered together with the display (2090-1101) Backlight cable assembly Note: N1912-61002 –...

  • Page 69: Main Board Assembly

    Repair Guide Main board assembly Keysight part Description Visual number N1911-61801 N1911A main board assembly [new] (non-video output option) N1911-66501 N1911A main board assembly — video output (video output option) option (Option H01) N1912-61801 N1912A main board assembly [new] (non-video output option) N1912-66501 N1912A main board assembly —...

  • Page 70: Ppmc (Processor Pci Mezzanine) Assembly

    Repair Guide PPMC (processor PCI mezzanine) assembly Keysight part number Description Visual PPMC PCA Note: – The same assembly is used for both N1911A and N1912A models N1911-66500 – N1911-66500 (single-channel PPMC PCA) (single-channel PPMC comes pre-programmed with N1911A firmware PCA) Top/bottom views –...

  • Page 71: Dap (Digital Acquisition & Processing) Assembly

    Repair Guide DAP (digital acquisition & processing) assembly Keysight part Description Visual number Measurement board Note: – The same assembly is used for both N1911A N1912-60004 and N1912A models – Two identical DAP assemblies are fitted to the N1912A model –...

  • Page 72: Psu (Power Supply Unit)

    Repair Guide PSU (power supply unit) Keysight part Description Visual number Power supply assembly kit [new] Note: – The same assembly is used for both N1911A N1912-61808 and N1912A models – Refurbished PSUs are not available – Cables N4010-61846 and N4010-61845 are N4010- supplied separately 61846...

  • Page 73: Rear Panel Assembly

    Repair Guide Rear panel assembly Main assembly Keysight part Description Visual number N1912-61007 Rear panel assembly [new] N1912-61031 Revised rear panel assembly [new] Note: – The rear panel assembly must be customized to suit the hardware configuration of the unit being repaired –...
  • Page 74 Repair Guide Customization details The standard P-Series power meters have the input sensor connector(s) and reference calibrator connector on the front panel. Option 003 is available to move the input sensor connector(s) and reference calibrator connector to the rear panel. Below are the customization details on rear panel assembly.
  • Page 75 Repair Guide Customization parts Keysight part number Description Visual E4418-20009 N-Type connector E4418-00016 Lock washer 2950-0132 Hex nut 3050- 2950- E4418- E4418- 0916 0132 20009 00016 3050-0916 Washer N1912-61806 Sensor flex assembly E4418-61015 Recorder output cable Keysight N1911A/1912A Service Guide...
  • Page 76 Repair Guide Keysight part number Description Visual (Two views shown for each part) 6960-0081 Rear panel plug (BNC) 6960-0024 Rear panel plug (sensor) 6960-0178 Rear panel plug (calibrator) 6960- 6960- 6960- 0024 0081 0178 Keysight N1911A/1912A Service Guide...

  • Page 77: Additional Spare Parts

    Repair Guide Additional spare parts Keysight part number Description Visual N1912-61036 Line module N4010-21025 Service connector cable Keysight N1911A/1912A Service Guide...

  • Page 78: Calibrator Assembly

    Repair Guide Calibrator assembly Keysight part number Description Visual Calibrator assembly (front connectors option). For more information on the improved calibrator N1911-61001 assembly, refer to “Improved calibrator assembly” on page 79. Calibrator assembly (rear connectors option) Note: N1911-61002 – Semi-rigid cable N1912-61004 is not included with assembly N1911-61002;...

  • Page 79: Improved Calibrator Assembly

    Repair Guide Improved calibrator assembly The N1911A/N1912A calibrator assembly is improved with a new type-N calibrator connector for a better fit with the front panel assembly as shown in Figure 5-1. The calibrator plug (N1912-21003) will not be needed with the improved calibrator assembly.

  • Page 80: Outer Housing Components

    Repair Guide Outer housing components Keysight part number Description Visual 5041-7717 Clamshell (top) 5041-7718 Clamshell (bottom) N1912-61005 Fan assembly Keysight N1911A/1912A Service Guide...
  • Page 81 Repair Guide Keysight part number Description Visual N1912-61025 Cable clamp 34401-86020 Bumper kit 34401-45021 Handle Keysight N1911A/1912A Service Guide...

  • Page 82: Sundries

    Repair Guide Sundries Keysight part number Description Visual N1911-61004 Calibrator semi-rigid cable (rear option) N1912-80005 Split ferrite N1911-61004 (with N1912-80005) Note: – If the semi-rigid cable is replaced, then the split ferrite must be positioned correctly (see “Additional Repair Notes” on page 109) Line module fuse, 3.15 A/250 V 2110-0957...

  • Page 83: Tools Required

    Repair Guide Tools Required Keysight part number Description Visual – 3 unit of ¼” drive torque wrenches – 1 unit of calibrated to 2.37 Nm (21 lb-in) – 1 unit of calibrated to 1.02 Nm (9 lb-in) – 1 unit of calibrated to 0.68 Nm (6 lb-in) –...

  • Page 84: 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 rear panel GPIB standoffs 9/32” socket 0.68 Nm Special tooling kit Fit rear panel Trig In/Out connectors 2.37 Nm (N1912-61807) Fit rear panel recorder output connectors...

  • Page 85: Disassembly Instructions

    Repair Guide Disassembly Instructions The guidelines in this section describe the disassembly of the major assembling in the Keysight N1911A and N1912A power meters. Instructions Visual – This procedure focuses primarily on model N1912A, Option 101 (i. e. dual channel, with front panel sensor and power reference connectors) –...
  • Page 86 Repair Guide Instructions Visual – Remove the top clamshell (Figure 5-3): Disconnect the mains power connector from the top clamshell. Disconnect the ribbon cable from the main board. Disconnect both earth spade connectors from the top clamshell. Remove top clamshell. Figure 5-3 –...
  • Page 87 Repair Guide Instructions Visual – Remove the PSU (Figure 5-5): Use the T10 Torx screwdriver bit to remove the 6 screws attaching the PSU to the top clamshell. Lift and remove the PSU. Figure 5-5 – Key to Figure 5-6 Figure 5-7: 1 Front panel assembly...
  • Page 88 Repair Guide Instructions Visual – With reference to Figure 5-6 Figure 5-7: – Lift and remove the cable clamp. – Disconnect the cable attaching the fan assembly to the main board. – Lift and remove the fan assembly – Disconnect the sensor RF connections from the main board.
  • Page 89 Repair Guide Instructions Visual – Disconnect the front panel cable (Figure 5-9): Depress both sides of the connector holding the ribbon cable to eject it. Figure 5-9 – Disconnect the semi-rigid cable (Figure 5-10): Note: – This only applies to Option 003 units. Use the 5/16”...
  • Page 90 Repair Guide Instructions Visual – Remove the front panel (Figure 5-11): Carefully lift and remove the front panel assembly. Figure 5-11 – Disconnect PPMC cables (Figure 5-6/Figure 5-7): Disconnect the service connector cable from the PPMC assembly. Disconnect the ribbon cable from the main board, whilst leaving it connected to the PPMC assembly.
  • Page 91 Repair Guide Instructions Visual – Remove DAP/PPMC (Figure 5-12): Use the T8 Torx screwdriver bit to remove the screws attaching the DAP and PPMC assemblies to the main board. Carefully remove the PPMC assembly by lifting the end closest to the DAP assembly.
  • Page 92 Repair Guide Instructions Visual – Remove the rear panel (Figure 5-14): Use the N1912-61807 special tooling kit to remove the fasteners on the trigger connectors. Use the 9/32” socket to remove the GPIB standoffs. Carefully pull the rear panel away from the main board.

  • Page 93: 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: – USB/LAN connectors must rest on top of the rear panels’ EMC spring fingers. –...
  • Page 94 Repair Guide Instructions Visual – Sensor RF connections (Figure 5-17): E — Channel A(+), Black cable F — Channel A(–), Black/White cable G — Channel B(+), Black cable H — Channel B(–), Black/White cable Note: – Only connect E and F for N1911A –...
  • Page 95 Repair Guide Instructions Visual – PSU cable routing (Figure 5-19): Ensure the PSU cables are positioned such that the cable guide does not trap them or pinch them. Figure 5-19 Keysight N1911A/1912A Service Guide...

  • Page 96: Disassembly Vs Part Replacement

    Repair Guide Disassembly vs Part Replacement Disassembly of replacement part Instructions Main board / Rear panel assembly / – Full strip-down required Bottom clamshell – Remove handle, bumpers, and top clamshell (including PSU) PSU / Top clamshell – PSU can now be removed from the top clamshell –...
  • Page 97 Repair Guide Disassembly of replacement part Instructions – Remove handle, bumpers, and top clamshell (including PSU) – Disconnect the sensor RF connections from the main board DAP assembly, Channel A (front connectors – Disconnect the sensor flex connection(s) from the main option) board –...
  • Page 98 Repair Guide Disassembly of replacement part Instructions – Remove handle, bumpers, and top clamshell (including PSU) – Disconnect calibrator semi-rigid from the rear panel assembly – Disconnect the calibrator assembly cable connection Front panel assembly (rear connectors from the main board option) –...

  • Page 99: Front Panel Disassembly Instructions

    Repair Guide Front Panel Disassembly Instructions Instructions Visual IMPORTANT NOTE: – The front panel assembly should only be repaired in a clean and dust-free environment. – Failure to do so may introduce contamination between the EMI shielded window and the display.
  • Page 100 Repair Guide Instructions Visual Flex cable White plastic plug Step 2: – Use ODU socket to remove N1912-61806 sensor flex assembly – Release the tab holding the flex cable to the display interface board, and then disconnect it Step 3: –...
  • Page 101 Repair Guide Instructions Visual Step 5: – Remove the 4 screws that attach the display to the display support molding, and then disconnect it from the display interface board Step 6: – Lift the display interface board off of the plastic mounting lugs on the display support molding to separate them from one another Keysight N1911A/1912A Service Guide...
  • Page 102 Repair Guide Instructions Visual Step 7: – Remove the 3 screws that attach the calibrator assembly to the display support molding, and separate them from one another Note: EMI spring – Take care not to damage the EMI spring fingers finger on the calibrator assembly Step 8:...
  • Page 103 Repair Guide Instructions Visual Step 10: – Release the metal tabs holding the EMI screen to the front panel sub-frame, and separate them from one another Step 11: – Disengage the rubber tabs that attach the key flex circuit to the keymat, and carefully lift it out Step 12: –...

  • Page 104: Front Panel Reassembly Instructions

    Repair Guide Front Panel Reassembly Instructions Instructions Visual Step 1: – Insert the keymat into the front panel Sub-frame Step 2: – Insert the EMI shielded window into the keymat, ensuring that it is clean and free from fingerprints Step 3: –...
  • Page 105 Repair Guide Instructions Visual Step 4: – Overlay the EMI screen onto the key flex circuit, ensuring that all of the metal tabs are engaged to hold it securely Step 5: – Fit the display interface board onto the plastic mounting lugs on the display support molding Keysight N1911A/1912A Service Guide...
  • Page 106 Repair Guide Instructions Visual Step 6: – Attach the inverter board to the display interface board using the 2 screws removed earlier Step 7: – Connect the inverter board to the display interface board using the backlight cable assembly Note: –...
  • Page 107 Repair Guide Instructions Visual Step 10: – Fit the split washer to the calibrator assembly Step 11: – Attach the display to the display interface board using the 4 screws removed earlier Step 12: – Connect the white plastic plug to the display interface board Keysight N1911A/1912A Service Guide...
  • Page 108 Repair Guide Instructions Visual Step 13: – Attach the front panel sub-frame to the display support moulding, ensuring that all plastic clips are engaged to hold it securely Step 14: – Connect the flex cable to the display interface board, and then tighten the locking tab Step 15: –...

  • Page 109: 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 5-20): 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 110: Main Board Vs. Rear Panel Assembly

    Repair Guide Main board vs. rear panel assembly Instructions Visual – Due to a difference in the connector positions Main board revision 102 for main board revision 102 and revision 103, there are TWO different rear panels – Revision 102 main boards are not available as Figure 5-21 spares —...

  • Page 111: Replacing The Ppmc Assembly

    Repair Guide Replacing the PPMC Assembly – The PPMC assembly is pre-programmed with N1912A firmware – Always perform a firmware upgrade to the instrument if the PPMC assembly has been replaced – Fitting a PPMC assembly that has been pre-programmed with N1912A NOTE firmware to an N1911A power meter will generate errors;...

  • Page 112: Replacing The Calibrator Semi-Rigid/Split Ferrite

    Repair Guide Replacing the Calibrator Semi-Rigid/Split Ferrite Instructions Visual – Separate the two halves of the ferrite (Figure 5-23) Figure 5-23 – Position the ferrite such that it’s furthest edge is 120 mm (4 ¾”) from the bend of the semi-rigid (Figure 5-24) –...

  • Page 113: Contacting Keysight Technologies

    Keysight N1911A/1912A P-Series Power Meters 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 114: Introduction

    Technologies about any aspect of the power meter, from service problems to ordering information, refer to “Sales and Technical Support” on page 10. If you wish to return the power meter to Keysight Technologies, refer to the section titled “Returning Your Power Meter for Service” on page 118.

  • Page 115: 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 116. If your power meter is covered by a separate maintenance agreement, please be familiar with the terms.

  • Page 116: 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 117: Instrument Serial Numbers

    – From the front panel (via the Service menu). – From the serial number label. The serial number label is attached to the rear 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 118: 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 119: Useful Web Pages

    Contacting Keysight Technologies Useful Web Pages – Main product page www.keysight.com/find/wideband_powermeters – Product manuals www.keysight.com/find/pseriesmanuals – Product firmware www.keysight.com/find/pseriesfirmware – Performance test & calibration software www.cal.software.keysight.com – Service notes N1911A https://servicenotes.literature.keysight.com/litapp/SearchSN.do?method=ope nExternalSNSearch&prodNum=N1911A N1912A https://servicenotes.literature.keysight.com/litapp/SearchSN.do?method=ope nExternalSNSearch&prodNum=N1912A Keysight N1911A/1912A Service Guide...
  • Page 120 Contacting Keysight Technologies THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK. Keysight N1911A/1912A Service Guide...
  • Page 121 This information is subject to change without notice. Always refer to the Keysight website for the latest revision. © Keysight Technologies 2006-2017 Edition 19, November 17, 2017 Printed in Malaysia *N1912-90015* N1912-90015 www.keysight.com...

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