Keysight Technologies N8262A Service Manual Download Page 69

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Theory of Operation

Keysight N8262A Service Guide

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:

– +12 Vdc [to mother board]
– +5 Vdc [to mother board]
– –5 Vdc [to mother board]
– –12 Vdc [to mother board]

Summary of Contents for N8262A

Page 1: ...Keysight N8262A P Series Modular Power Meter Service Guide ...

Page 2: ...customarily provided to the public to use modify reproduce release per form display or disclose commercial computer software or commercial com puter software documentation No additional government requirements beyond those set forth in the EULA shall apply except to the extent that those terms rights or licenses are explicitly required from all providers of commercial computer software pursu ant t...

Page 3: ...ion or maintenance The design and implementation of any circuit on this product is the sole responsibility of the Buyer Keysight does not warrant the Buyer s circuitry or malfunctions of Keysight products that result from the Buyer s circuitry In addition Keysight does not warrant any damage that occurs as a result of the Buyer s circuit or any defects that result from Buyer supplied products To t...

Page 4: ...s Safety Notices WARNING A WARNING notice denotes a hazard It calls attention to an operating procedure practice or the like that if not correctly performed or adhered to could result in personal injury or loss of life Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met CAUTION A CAUTION notice denotes a hazard It calls attention to an operating proce...

Page 5: ... Earth ground terminal Frame or chassis ground terminal Protective earth ground terminal Equipment protected throughout by double insulation or reinforced insulation Both direct and alternating current Out position of a bi stable push control Caution hot surface In position of a bi stable push control This symbol indicates the operating switch for Stand by mode Note the instrument is NOT isolated ...

Page 6: ...ologies assumes no liability for the customer s failure to comply with these requirements WARNING Before this instrument is switched on make sure it has been properly grounded through the protective conductor of the ac power cable to a socket outlet provided with protective earth contact Any interruption of the protective grounding conductor inside or outside the instrument or disconnection of the...

Page 7: ...e for use by service trained personnel only DO NOT service or adjust alone Under certain conditions dangerous voltages may exist even with the equipment switched off To avoid dangerous electrical shock service personnel must not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present DO NOT operate damaged equipment Whenever it is po...

Page 8: ...8 Keysight N8262A Service Guide CAUTION Applying excessive voltage or overloading the device will cause irreversible damage to the circuitry Use the device with the cables provided ...

Page 9: ...quirements for this instrument Environmental condition Requirement Temperature Operating condition 0 C to 55 C Storage condition 30 C to 70 C Humidity Operating condition Min 15 RH at 40 C non condensing Max 95 RH at 40 C non condensing Storage condition Max 90 RH at 65 C non condensing Altitude Operating condition 3 000 meters 9 840 feet Storage condition 15 420 meters 50 000 feet ...

Page 10: ...etic 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 USA UL 61010 1 2004 EMC compliance Complies with the requirements of the EMC Directive 89 336 EEC ...

Page 11: ...gistered trademark of the Australian Communications and Media Authority ICES NMB 001 indicates that this ISM device complies with the Canadian ICES 001 Cet appareil ISM est conforme a la norme NMB 001 du Canada 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 domes...

Page 12: ...itoring and Control Instrument product The affixed product label is as shown below Do not dispose in domestic household waste To return this unwanted instrument contact your nearest Keysight Service Center or visit http about keysight com en companyinfo environment takeback shtml for more information Sales and Technical Support To contact Keysight for sales and technical support refer to the suppo...

Page 13: ...MC compliance 10 Regulatory Markings 11 Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC 12 Product category 12 Sales and Technical Support 12 1 Specifications Introduction 24 Specification Definitions 25 Conditions 26 General Features 27 P Series Modular Power Meter and Sensor 28 Key system specifications and characteristics 28 P Series Modular Power Meter Specifications 30 P S...

Page 14: ...racteristics Peak Flatness 38 Noise and drift 39 2 Performance Tests Introduction 42 Complete Equipment List 43 1 mW Power Reference Level Test 45 Description 45 Equipment 45 Test method 45 Output Standing Wave Ratio SWR Test 46 Description 46 Equipment 46 Test method 47 Time Base Frequency Accuracy 48 Description 48 Equipment 48 Test method 48 Zero Set Average Path 49 Description 49 Equipment 49 ...

Page 15: ...rity Peak Path 56 Description 56 Equipment 56 Test method 56 Rise Fall Time Peak Path 57 Description 57 Equipment 57 Test method 57 3 Adjustments Introduction 60 Power Reference Level Adjustment 61 Equipment 61 Test method 61 4 Theory of Operation PPMC Assembly 64 Mother Board Assembly 65 Measurement Board Assembly 66 Calibrator Assembly 67 Front Panel Assembly 68 PSU Assembly 69 5 Troubleshooting...

Page 16: ...ceable Parts 83 Front panel assembly 83 Mother board assembly 86 PPMC processor PCI mezzanine assembly 86 Measurement board assembly 87 PSU power supply unit 88 Calibrator assembly 89 Required Torque Values for Fasteners 90 Disassembly Instructions 91 Location of replaceable parts 91 Front panel disassembly instructions 93 Calibrator disassembly instructions 102 Power supply disassembly instructio...

Page 17: ...sembly 116 7 Contacting Keysight Technologies Introduction 118 Contacting Keysight Technologies 118 Before Calling Keysight Technologies 119 Check the Basics 120 Instrument Serial Numbers 121 Returning Your Power Meter for Service 122 Useful Web Pages 124 ...

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Page 19: ...igure 1 2 N192XA error in peak to average measurements for a two tone input High Medium Low and Off filters 38 Figure 2 1 Absolute accuracy test setup 53 Figure 6 1 Overview of the main assemblies 91 Figure 6 2 Overview of the replaceable parts 92 Figure 6 3 Overview of the front panel assemblies 92 Figure 6 4 Creating a sharp bend 115 ...

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Page 21: ...Keysight N8262A Service Guide 21 List of Tables Table 1 1 Dynamic response rise time fall time and overshoot ver sus video bandwidth settings 37 ...

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Page 23: ... Power Meter and Sensor 28 P Series Modular Power Meter Specifications 30 P Series Wideband Power Sensor Specifications 32 Sensor Calibration Uncertainty 33 1 mW Power Reference 34 System Specifications and Characteristics 37 Characteristics Peak Flatness 38 This chapter lists the power meter s specifications and describes how to interpret these specifications ...

Page 24: ...range unless otherwise stated and after performing a zero and calibration Supplemental characteristics which are shown in italics are intended to provide information useful in applying the power meter by giving typical but non warranted performance parameters These characteristics are shown in italics or denoted as attributes nominal or approximate For information on measurement uncertainty calcul...

Page 25: ...on Characteristic specifications are not verified on all units There are several types of characteristic specifications These types can be placed in two groups One group of characteristic types describes attributes common to all products of a given model or option Examples of characteristics that describe attributes are product weight and 50 input Type N connector In these examples product weight ...

Page 26: ...hen 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 and used in accordance to the information provided in the N8262A P Series Modular Power Meter User s Guide ...

Page 27: ...inition Time parameter measurements of pulse rise time fall time pulse width time to positive occurrence and time to negative occurrence are also provided Sensor compatibility Keysight P Series modular power meter is compatible with all Keysight P Series wideband power sensors E Series sensors except E9320 range and 8480 Series power sensor a a Information contained in this document refers to oper...

Page 28: ...Pulse Width is the recommended minimum pulse width viewable on the power meter where power measurements are meaningful and accurate but not warranted Overshoot 5 a Average power measurement accuracy N1921A 0 2 dB or 4 5 c N1922A 0 3 dB or 6 7 c Specification is valid over 15 to 12 dBm and a frequency range 0 5 to 10 GHz DUT Max SWR 1 27 for the N1921A and a frequency range 0 5 to 40 GHz DUT Max SW...

Page 29: ... 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 2 system rise time 2 and the error is Error measured rise time signal under test rise time signal under test rise...

Page 30: ...ebase 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 Latency a 160 ns 10 ns Jitter 5 ns RMS External TTL trigger input High 2 4 V Low 0 7 V Latency b 90 ns 10 ns Minimum trigger pulse width 15 ns Minimum trigger repetition period 50 ns Impedance 50 Jitter 5 ns RMS ...

Page 31: ... value to a minimum of 10 ns Trigger level threshold hysteresis Range 3 dB Resolution 0 05 dB a Internal trigger latency is defined as the delay between the applied RF crossing the trigger level and the meter switching into the triggered state b External trigger latency is defined as the delay between the applied trigger crossing the trigger level and the meter switching into the triggered state c...

Page 32: ... Sensor model Frequency range Dynamic range Damage level Connector type N1921A 50 MHz to 18 GHz 35 to 20 dBm 500 MHz 23 dBm average power 30 dBm 1 s duration peak power Type N m 30 to 20 dBm 50 to 500 MHz N1922A 50 MHz to 40 GHz 35 to 20 dBm 500 MHz 2 4mm m 30 to 20 dBm 50 to 500 MHz Frequency band N1921A N1922A 50 MHz to 10 GHz 1 2 10 GHz to 18 GHz 1 26 18 GHz to 26 5 GHz 1 3 26 5 GHz to 40 GHz 1...

Page 33: ...bration process Physical characteristics 1 Beyond 70 humidity and additional 0 6 should be added to these values Frequency band N1921A N1922A 50 MHz to 500 MHz 4 5 4 3 500 MHz to 1 GHz 4 0 4 2 1 GHz to 10 GHz 4 0 4 4 10 GHz to 18 GHz 5 0 4 7 18 GHz to 26 5 GHz 5 9 26 5 GHz to 40 GHz 6 0 Dimensions Length x Width x Height N1921A N1922A 135 mm 40 mm 27mm 127 mm 40 mm 27 mm Weights with cable Option ...

Page 34: ...able to the National Physical Laboratory NPL UK Accuracy over 2 years 1 2 0 to 55 o C 0 4 25 to 10 oC Frequency 50 MHz nominal SWR 1 08 0 to 55 o C 1 05 typical Connector type Type N f 50 Recorder outputs a a Two recorder outputs are available on the N8262A P Series modular power meter Analog 0 to 1 V 1 k output impedance SMB connector There are two recorder outputs with SMB connector Trigger inpu...

Page 35: ...ction Line power Input voltage range 100 to 120 V 10 220 to 240 V 10 Input frequency range 50 to 60 Hz 10 all voltages 400 to 440 Hz 10 100 to 120 V Power requirement 50 VA 30 watts not exceeding 75 VA 50 watts WARNING A 3 kV 100 kHz transient in the power line may cause the instrument to reset Interface 10 100 BaseT LAN interface Command language SCPI standard interface commands Measurement speed...

Page 36: ...e Physical characteristics Dimensions The following dimensions exclude front and rear panel protrusions 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 Shipping weight 7 7 kg 17 0 lb approximately ...

Page 37: ...ides the warranted rise time and fall time specification and is the recommended setting for minimizing overshoot on pulse signals Table 1 1 Dynamic response rise time fall time and overshoot versus video bandwidth settings Video bandwidth setting Parameter Low Medium High Off 5 MHz 15 MHz 30 MHz 500 MHz 500 MHz Rise time fall time a 56 ns 25 ns 13 ns 36 ns 13 ns Overshoot b 5 5 a Specified as 10 t...

Page 38: ...s 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 Figure 1 2 N192XA error in peak to average measurements for a two tone input High Medium Low and Off filters ...

Page 39: ...e length 10 ns to a limit of 50 nW Sensor model Zeroing Zero set Zero drift a Noise per sample Measurement noise free run b 500 MHz 500 MHz N1921A N1922A No RF on input 200 nW 200 nW 100 nW 2 W 50 nW 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 This component can be disregarded with Auto zero mode set to ON b Measured over...

Page 40: ...1 Specifications 40 Keysight N8262A Service Guide THIS PAGE HAS BEEN INTENTIONALLY LEFT BLANK ...

Page 41: ... 45 Output Standing Wave Ratio SWR Test 46 Time Base Frequency Accuracy 48 Zero Set Average Path 49 Zero Set Peak Path 50 Linearity Average Path 51 Absolute Accuracy Test Average Path 52 Linearity Peak Path 56 Rise Fall Time Peak Path 57 This chapter contains procedures which allow you to test the power meter s electrical performance to it s specifications ...

Page 42: ...nce Output Time Base Frequency Accuracy Zero Set Average Path Zero Set Peak Path Linearity Average Path Absolute Accuracy Test Average Path Rise Fall Time Peak Path NOTE This document does not provide a complete breakdown for these tests it only gives a brief overview of each in line with Keysight s recommendation that the Keysight N7832A calibration software should be used at all times Performanc...

Page 43: ...sal counter Frequency 10 MHz Gate time 10 seconds 53132A 53131A Meters Power meter Dual channel Absolute accuracy 0 5 Power reference accuracy 0 9 a E4419B E4419A Power sensor two required Frequency 50 MHz Amplitude range 70 dBm to 20 dBm SWR 1 15 at 50 MHz 8481D Power sensor Frequency 50 MHz Amplitude range 30 dBm to 20 dBm SWR 1 1 at 50 MHz 8482A Attenuators 20 dB fixed attenuator Type N m f 849...

Page 44: ...ion 001 SMB f to BNC m cable Frequency DC to 10 GHz 50 Coax 120 cm 48 in Calibration test cable N1912 61017 Sensor cable required 11730A N type calibration kit 85032B Assorted accessories cables and adapters required a A best capability measurement is required for the power reference output the power level must be accurately measured and the uncertainty of this measurement must also be known Instr...

Page 45: ...d 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 1 mW 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 reference level of the DUT NOTE...

Page 46: ... 8753ES ET network analyzer 1 unit of 85032B type N calibration kit 1 unit of E4419B or E4417A dual channel power meter 2 units of 8481D power sensor 2 units of 11667A 001 power splitter 1 unit of 20 dB pad male to female e g 8491A 1 unit of 30 dB pad e g 11708A reference attenuator An alternative network analyzer can be used as long as it can measure S11 in the 45 to 55 MHz range Either of the E4...

Page 47: ...wer reference level of the DUT 4 Remove the OPEN connector from the Measurement System terminate it with the 50 R load from the 85032B calibration kit and repeat the 1 mW power reference level measurement 5 Using all of these values the N7832A software will calculate the VSWR of the power reference output NOTE This test cannot be performed manually due to the complexity of the equipment calibratio...

Page 48: ...ed as long as it has the appropriate bandwidth 10 MHz 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 NOTE This test can be configured manually via the command SERV BIST TBAS STAT ON which enables the 10 MHz feed to the trigger output connector refer to the Programm...

Page 49: ...d as the measured value Equipment No test equipment required Test Method 1 Execute the internal zero set measurement procedure for Channel A 2 Read back the result of the measurement from the DUT 3 Repeat this procedure for Channel B 4 The test will take a few minutes to complete 5 The measurement result should be less than 0 0000175 The smaller the measurement result the smaller the amount of res...

Page 50: ...as the measured value Equipment No test equipment required Test method 1 Execute the internal zero set measurement procedure for Channel A 2 Read back the result of the measurement from the DUT 3 Repeat this procedure for Channel B 4 The test will take a few minutes to complete 5 The measurement result should be less than 0 015 The smaller the measurement result the smaller the amount of residual ...

Page 51: ...nt No test equipment required Test method 1 Execute the internal linearity measurement procedure for Channel A 2 Read back the result of the measurement from the DUT 3 Repeat this procedure for Channel B 4 The test will take a few minutes to complete 5 The measurement result should be less than 0 5 and greater than 0 5 The optimum measurement result for this test is 0 NOTE This test can be perform...

Page 52: ...sure 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 2 units of 10503A BNC cable 1 unit of BNC T joint connector BNC female male female 1 unit of BNC female to dual banana connector ...

Page 53: ... to enable the 11683A Option H01 range calibrator to operate properly 11683A range calibrator front panel 11683A range calibrator rear panel N8262A P Series modular power meter BNC T joint connector 3458A digital multimeter BNC cable BNC cable Banana connector Banana connector 33250A function generator NOTE For the Keysight N8262A P Series modular power meter the equivalent key presses should be p...

Page 54: ...nput and the voltmeter using cables and a BNC T joint connector at the range calibrator 9 Configure the DUT as shown below 10 Configure the voltmeter using the default setup settings NOTE When switching the range calibrator to STANDBY allow enough time for the range calibrator to settle to its zero value before attempting to zero the Keysight N8262A P Series modular power meter This settling would...

Page 55: ...uracy of the N8262A in a table as shown below Effective power DC voltage Voltmeter range Power meter filter voltmeter NRDNS CH A error CH B error Specification 12 dBm 0 00565 V 0 1 V 256 0 5 5 dBm 0 02834 V 0 1 V 64 0 5 5 dBm 0 28400 V 1 V 64 0 5 8 dBm 0 56700 V 1 V 16 0 5 10 dBm 0 90100 V 1 V 16 0 5 12 dBm 1 43500 V 10 V 16 0 5 14 dBm 2 29000 V 10 V 16 0 5 16 dBm 3 66700 V 10 V 16 0 5 17 dBm 4 65...

Page 56: ...nnel A 2 Read back the result of the measurement from the DUT 3 Repeat this procedure for Channel B 4 The test will take a few minutes to complete 5 The measurement result should be less than 0 8 and greater than 0 8 The optimum measurement result for this test is 0 NOTE This test can be performed manually via the commands SERV BIST PEAK 1 2 LIN 0 SERV BIST PEAK 1 2 LIN PERR Refer to the Programmi...

Page 57: ... 2 units of N1912 61017 calibration test cable 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 units of the sample resolution of the DUT 3 Analyze the equivalent pulse to determine the 10 and 90 voltage levels of the rising falling edges 4 Analyze the equivalent pulse to determine when the 10 and 90 crossover...

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Page 59: ...8262A P Series Modular Power Meter Service Guide 59 3 Adjustments Introduction 60 Power Reference Level Adjustment 61 This chapter contains checks and adjustments that ensure proper performance of the power meter ...

Page 60: ...e 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 Adjustment can be carried out without having to remove the outer covers from the DUT ...

Page 61: ...ure power ref level as per the performance test a If the result is 1 mW then decrement FINE by 1 b If the result is 1 mW then increment FINE by 1 5 Repeat step 4 until the result crosses the 1 mW boundary in either direction 6 The adjustment is completed NOTE This adjustment can be performed manually via the commands SERV CAL ADJ COUR Value SERV CAL ADJ COUR SERV CAL ADJ FINE Value SERV CAL ADJ FI...

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Page 63: ...ce Guide 63 4 Theory of Operation PPMC Assembly 64 Mother Board Assembly 65 Measurement Board Assembly 66 Calibrator Assembly 67 Front Panel Assembly 68 PSU Assembly 69 This chapter describes how each of the power meter s individual assemblies operate ...

Page 64: ... interfaces for LAN Stores the power meter firmware in Flash EEPROM Stores the power meter serial number and option data Inputs Power supplies from PSU via mother board Control and data lines from mother board and measurement board s LAN communications from external equipment Outputs Control address and data lines to mother board and measurement board s ...

Page 65: ...corder output s Provides signal routing between the PPMC and measurement board s Inputs Power supplies from PSU Sensed power level s from sensor flex s Trigger input from external equipment Control address and data lines from PPMC Outputs Processed average path measurement to PPMC Unprocessed peak path measurement samples to measurement board s Trigger output and recorder output s to external equi...

Page 66: ... 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 Processed peak path measurement data to PPMC via mother board Control and data lines to PPMC via mother board ...

Page 67: ...r 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 Control and data lines to PPMC via mother board ...

Page 68: ...ly 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 Control and data lines to PPMC via mother board ...

Page 69: ...embly 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 12 Vdc to mother board 5 Vdc to mother board 5 Vdc to mother board 12 Vdc to mother board ...

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Page 71: ... Power Up Problems 73 Instrument Self Test 74 Extended Self Test 76 Performance Test 77 Power Reference Level Adjustment Problems 78 Communication Interface Failures 79 Additional Diagnostic Tests 80 This chapter contains troubleshooting flow charts designed to isolate faults in the LAN interface port ...

Page 72: ...ied 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: ...s Check reseat the cable between the line module and the PSU Check reseat the cable between the PSU and the mother board Green LED DS1 If this is off then the PSU may be faulty Green LED DS4 This should come on when the power button is pressed Green LEDs DS2 DS3 These will flash on and off during normal operation Possible faults PSU Mother board Rocker switch defect Loose front panel board ribbon ...

Page 74: ...k reseat the cable between the fan assembly and the mother board Check visually to see whether or not the fan is working Fan assembly high probability Mother board low probability Battery Checks that the lithium manganese battery on the mother board is working Replace the battery to see if this clears the fault Lithium manganese battery high probability Mother board low probability ChA peak path V...

Page 75: ...ations Replace the measurement board assembly for channel B to see if this clears the fault Measurement board assembly channel B low probability Mother board high probability ChB CW path Verifies that the average path of channel B is working Note This does not prove that the average path meets its specifications Not applicable Mother board ChB measurement board check Executes an internal self test...

Page 76: ...ide Extended Self Test Instrument Purpose Debug tips Possible faults Time base Provides a means to measure time base frequency accuracy Check that the SMB cable being used is not damaged Check that the SMB is connected to Trig Out not Trig In Mother board ...

Page 77: ...that the SMB is connected to Trig Out not Trig In Mother Board Zero set average path failures Not applicable Mother Board Zero set peak path failures Not applicable Mother Board Linearity average path failures Not applicable Mother Board Linearity peak path failures Replace the measurement board assembly for the channel to see if this clears the fault Measurement board assembly low probability Mot...

Page 78: ...5 Troubleshooting Guide 78 Keysight N8262A Service Guide Power Reference Level Adjustment Problems Possible faults Calibrator assembly high probability Mother board low probability ...

Page 79: ... 5 Keysight N8262A Service Guide 79 Communication Interface Failures Type of communication Debug tips Possible faults LAN communication Check visually to see whether or not the connector is obstructed damaged PPMC assembly ...

Page 80: ...gnostic Tests Type of functionality Reason Recommended test method Possible faults Sensor functionality The N7832A software does not prove both paths of the sensor flex assembly Connect an E4412A sensor to the DUT and ensure it can be zeroed calibrated Sensor flex assembly ...

Page 81: ...placeable Parts 83 Required Torque Values for Fasteners 90 Disassembly Instructions 91 Reassembly Instructions 113 Additional Repair Notes 115 Replacing the PPMC Assembly 116 This chapter details the power meter s replaceable parts It also explains how to assemble and disassemble the power meter ...

Page 82: ...assemble the power meter for repair The contents included are 1 Replaceable Parts 2 Required Torque Values for Fasteners 3 Disassembly Instructions 4 Reassembly Instructions 5 Additional Repair Notes 6 Replacing the PPMC Assembly To order parts contact your local Keysight Technologies Sales and Service Office To return your power meter for servicing at a qualified service center refer to Chapter 7...

Page 83: ...ailable 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 N8262 60107 Front panel assembly N8262 20201 Front frame ...

Page 84: ...or positions The sensor flex assembly is supplied straight and so it must be folded to match the assembly being replaced see Additional Repair Notes on page 115 Channel A and B sensor flex assembly is not included with front panel assembly part number N8262 60107 if this is required it is available as a separate item N8262 60209 Recorder cable Keysight part number Description Visual ...

Page 85: ...262 60208 Trigger in out cable N8262 20101 Power reference input Note 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 part number Description Visual ...

Page 86: ...embly Keysight part number Description Visual N8262 63001 PCA mother board assembly Keysight part number Description Visual N8200 60002 PPMC assembly Note Refurbished PPMC assemblies are not available The PPMC assembly must be programmed once it has been installed see Additional Repair Notes on page 115 ...

Page 87: ...eysight N8262A Service Guide 87 Measurement board assembly Keysight part number Description Visual N1912 60004 Measurement board Note There are two identical measurement board in the N8262A P Series modular power meter ...

Page 88: ... Repair Guide 88 Keysight N8262A Service Guide PSU power supply unit Keysight part number Description Visual 0950 5146 PSU Note Refurbished PSUs are not available N8262 60202 Power supply cable assembly ...

Page 89: ...Repair Guide 6 Keysight N8262A Service Guide 89 Calibrator assembly Keysight part number Description Visual N1911 61002 Calibrator assembly Top view Bottom view N8262 6021 Calibrator cable assembly ...

Page 90: ...it 9 in Ibs Fit calibrator to bottom chassis T6 Torx screwdriver bit 3 in Ibs Fit mother board to chassis Fit measurement board to mother board Fit PPMC board to mother board T8 Torx screwdriver bit 6 in Ibs Fit recorder output to front frame Fit trigger in out to front frame 1 4 socket 6 in Ibs Fit channel A B to front frame ODU socket 6 in Ibs Fit power reference input cable to calibrator 5 16 s...

Page 91: ...ssembly Calibrator disassembly Power supply disassembly Mother board measurement board and PPMC board disassembly Location of replaceable parts Figure 6 1 Overview of the main assemblies Power Supply Assembly Calibration Board Assembly PPMC Board Mother Board Ch A Measurement Board Ch B Measurement Board Power Supply Assembly Calibration Board Assembly PPMC Board Mother Board Ch A Measurement Boar...

Page 92: ... Assem bly Calibrator cable assem bly Recorder 1 2 Cable Channel B Flex Cable Channel A Flex Cable Fan W ire Trigger In Trigger Out Cable Trigger Board Assem bly Power Supply Cable Assem bly Calibrator cable assem bly Recorder 1 2 Cable Channel B Flex Cable Channel A Flex Cable Fan W ire Trigger In Trigger Out Cable Trigger Board Assem bly Front Panel Assembly ...

Page 93: ...vice Guide 93 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 ...

Page 94: ...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 Step 1 Lift and remove channel B sensor flex cable from J23 Step 2 Lift and remove channel A sensor flex cable from J18 Instructions Visual ...

Page 95: ...ve 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 Instructions Visual ...

Page 96: ...om J4 Step 4 Lift and remove the bottom coaxial cable labeled 5 channel A from J5 Note These coaxial cables originally routed under the measurement board assembly 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 out from P2 Note These coaxial cable are originally routed on the right side of the chassis along the wall See the...

Page 97: ...tor 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 Instructions Visual ...

Page 98: ... 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 Note During this step you will be able to take out the front panel assembly which is inclusive of channel A and B sensor flex assembly recorder output cables and trigger in out cables Instructions Visual ...

Page 99: ...ker switch assembly during this step Step 1 Use the 1 4 socket to remove the nuts Remove the trigger in out cables and the recorder output cables Step 2 Use the ODU socket to remove the nut of channel A and B s sensor flex assembly Note You are not require to remove all the nuts and sockets unless you wish to remove the front frame You may remove the nuts or sockets for parts that need to be disas...

Page 100: ...ch 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 Instructions Visual ...

Page 101: ...nect 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 Instructions Visual ...

Page 102: ...x 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 Pull and remove the cover at the rear panel See the figure to the right for more details ...

Page 103: ...rx 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 Instructions Visual ...

Page 104: ...orx 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 Pull and remove the cover at the rear panel See the figure to the right for more details ...

Page 105: ...ove 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 Use the same tool to remove the three remaining screws Instructions Visual ...

Page 106: ...ve 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 Instructions Visual ...

Page 107: ...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 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 on the right column for more details ...

Page 108: ... and remove recorder 1 and recorder 2 from J31 and J30 which are located on the mother board assembly Step 2 Lift and remove power supply cable assembly from the mother board Step 3 Disconnect the RS 232 ribbon cable from the PPMC assembly Step 4 Disconnect the LAN extension cable from PPMC assembly Note You will be able to remove PPMC assembly at this step Instructions Visual ...

Page 109: ...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 Lift and remove the measurement board assembly Note You will be able to remove the measurement board assembly at this step Instructions Visual 1 2 ...

Page 110: ...rd 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 out from P2 Note These coaxial cable are originally routed on the right side of the chassis along the wall See the figure to the right for more details Instructions Visual ...

Page 111: ...ard assembly at this step 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 Step 4 Lift and remove the bottom coaxial cable labeled 5 channel A from J5 Note These coaxial cables originally routed under the measurement board asse...

Page 112: ...ribbon cable which is connected from the mother board assembly to the front panel board Use a T20 Torx screwdriver bit and T8 screwdriver bit accordingly to remove the six screws which holds the mother board assembly to the chassis Lift and remove the mother board assembly from chassis carefully Note You will be able to remove the mother board assembly at this step Instructions Visual ...

Page 113: ...ou connect a new front panel board ribbon cable When connecting a new trigger in out cable assembly or channel A and B sensor flex cable you are recommended to label each of the cable as follows Channel A top cable labeled with 4 Channel A bottom cable labeled with 5 Channel B top cable labeled with 2 Channel B bottom cable labeled with 3 Trigger in cable labeled with 1 Trigger out cable labeled w...

Page 114: ...ew 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 Instructions Visual ...

Page 115: ...nt after heat has been applied to it i e using a hot air gun or a similar device Figure 6 4 Creating a sharp bend NOTE Once this sharp bend has been created the flex should not be bent at this point again to do so may break the tracking within the flex Route and connect the sensor flex assembly once the sensor flex assembly has been attached to the power meter it should be folded to match the rout...

Page 116: ...re 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 Instrument option s This these can be stored in the PPMC assembly via the command SERV OPT CHARACTER DATA Refer to the Programming Guide for further details on the use of these commands ...

Page 117: ...ing Keysight Technologies Introduction 118 Before Calling Keysight Technologies 119 Check the Basics 120 Instrument Serial Numbers 121 Returning Your Power Meter for Service 122 Useful Web Pages 124 This chapter details what to do if you have a problem with your power meter ...

Page 118: ...e titled Before Calling 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 on page 12 If you wish to return the power meter to Keysight Technologies refer to...

Page 119: ...eter is covered by a separate maintenance agreement please be familiar with the terms Keysight Technologies offers several maintenance plans to service your power meter after warranty expiration Call your Keysight Technologies Sales and Service Center for full details If the power meter becomes faulty and you wish to return the faulty instrument follow the description on how to return the faulty i...

Page 120: ...heck that the line socket has power Check that the power meter is plugged into the proper ac power source Check that the power meter is switched on Check that the other equipment cables and connectors are connected properly and operating correctly Check the equipment settings in the procedure that was being used when the problem occurred Check that the test being performed and the expected results...

Page 121: ...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 The serial number is divided into two parts the prefix two letters and the first four numbers and the suffix the last four numbers The prefix letters indicate the country of...

Page 122: ...gh to accommodate the power meter and allow at least 3 to 4 inches on all sides of the power meter for packing material Surround the power meter with at least 3 to 4 inches of packing material or enough to prevent the power meter from moving in the carton If packing foam is not available the best alternative is SD 240 Air Cap TM from Sealed Air Corporation Commerce CA 90001 Air Cap looks like a pl...

Page 123: ...Contacting Keysight Technologies 7 Keysight N8262A Service Guide 123 Mark the shipping container FRAGILE HANDLE WITH CARE to ensure careful handling Retain copies of all shipping papers ...

Page 124: ... Contacting Keysight Technologies 124 Keysight N8262A Service Guide Useful Web Pages Main Product Page www keysight com find powermeter Performance Test Calibration Software www cal software keysight com ...

Page 125: ...ion 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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