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Agilent Technologies e4418b Agilent E4418B/E4419B Service Guide, Troubleshooting, Introduction

Models: e4419b e4418b

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Troubleshooting

Introduction

A

Select

Preset/local

Confirm

Lower Window - using

Meas/Setup

Limits

Limits On

TTL Output

TTL Output On, Fail O/P Low

			Yes		DVM reading			No
			Yes		5.0V+/-0.5V?			No
					5.0V+/-0.5V?


							Power down meter.
Select							Power down meter.
Select							Disconnect ac power and battery if fitted.
Fail O/P High							Remove A2 Processor assy, as directed on page
							5-9, to access the Comms Assembly connector.
							Use DVM to check resistance between J4 pin 42
							and Rmt I/O connector pin 4.

DVM reading

Yes 0.0V+/-0.5V?

No Fault found with Upper Window TTL Over Limit detection circuit - check user application/implementation

No

A2 Processor Assy

Defective

Yes		DVM reading		No
		450Ω +/- 10%

A4 Comms Assy

Defective

End

6-6	Agilent E4418B/E4419B Service Guide

Image 114

Agilent Technologies e4418b, e4419b manual Agilent E4418B/E4419B Service Guide, Troubleshooting, Introduction

Contents

Agilent Technologies E4418B/E4419B Power Meters Service GuideAgilent E4418B/E4419B Service Guide Copyright 1998, 2003Agilent TechnologiesPrinted in the UK Warranty Legal InformationCertification Limitation of Warranty Exclusive RemediesPersonal Safety Considerations Equipment OperationWarnings and Cautions General Safety Considerations MarkingsStatement of Compliance Installation InstructionsIEC 1010-1 Compliance User EnvironmentList of Related Publications Agilent E4418B/E4419B Service Guide is available by ordering OptionSales and Service Offices Europe Latin AmericaUnited States Returning Your Power Meter for Service Package the Power Meter for ShipmentChapter 3 Adjustments About this GuideChapter 1 Specifications Chapter 6 TroubleshootingTable of Contents PageSpecification Test SetupProcedure Test ProcedureMeasurement Uncertainty Analysis Instrument Accuracy Test1 Measurement Uncertainty Analysis Power Reference Level Test1 Specifications Introduction IntroductionPower Range Power Meter SpecificationsMeter Power SensorsPower Sensor AccuracyTable 1-1 Zero Set Specifications Instrumentation1 mW Power Reference1 50 MHz nominalPower Meter Supplemental Characteristics Measurement SpeedZero Drift of Sensors x2 mode Measurement NoiseNormal Mode Noise MultiplierZero Drift Measurement NoiseNormal Mode Settling TimeFor Agilent 8480 series power sensors x2 modex2 mode For Agilent E-series power sensorsNormal Mode Settling Time sMaximum dBm Normal Modex2 Mode Maximum dBmZero Drift Power Sensor SpecificationsDefinitions Zero Set Measurement NoiseWeight Battery Option 001 Operational CharacteristicsService Life Typical Operating TimeLine Power General CharacteristicsRear Panel Connectors Recorder OutputsOperating Environment Environmental CharacteristicsGeneral Conditions Storage ConditionsSafety DimensionsWeight GeneralCommand Language Remote ProgrammingNon-Volatile Memory Battery1-18 Agilent E4418B/E4419B Service GuideSpecifications GeneralPerformance Tests Introduction User’s GuidePerformance Tests Table 2-1 Required Equipment Equipment RequiredCritical Specification EquipmentPerformance Tests Test ProceduresPerformance Test Record Calibration CycleZero Test SpecificationTest Setup DescriptionProcedure Input SettingsSpecification Test ProcedureInstrument Accuracy Test DescriptionFigure 2-2 Instrument Accuracy Test Setup Test SetupProcedure ConfirmWhen switching the range calibrator to STANDBY, allow enough 3 ∝W 10 ∝W30 ∝W Figure 2-3 Instrument Accuracy Average Path Test Setup Test ProcedureTest Setup EquipmentThere is a small risk of mild electrical shock from the Procedurethe power meter is connected chassis of the 11683A option H01 range calibrator unlessInput Settings , More Table 2-4 Instrument Accuracy Results Description Power Reference Level TestCharacteristics ElectricalEquation 2-4 Power Level Provided By The Reference Oscillator Figure 2-4 Power Reference Level Test Setup Test SetupProcedure PowerActual Result Press , Power Ref OnTable 2-5 Power Reference Level Test Result 0.999 mWAgilent E-Series Power Sensor Interface Test ProcedureAgilent E-Series Power Sensor Interface Test Figure 2-5 Sensor Functional Test Setup Agilent E-Series Power Sensor Functional TestProcedure DescriptionFigure 2-6 Sensor Functional Test Setup with Attenuator Table 2-6 Functional Test Result Performance Test Record Performance Test Record1. This test is not channel related Adjustments power applied to the instrument and with protective Safety ConsiderationsAdjustments described in this chapter are performed with covers removed. Maintenance should be performed only byAssembly Replaced Post-Repair AdjustmentsTable 3-1 Post Repair Adjustments, Tests, and Checks Related Adjustments, PerformanceFigure 3-1 Adjustment Setup Power Reference Oscillator Frequency AdjustmentProcedure DescriptionFigure 3-2 A2L9 Adjustment Location Power Reference Oscillator Level Adjustment Power Reference Oscillator Level AdjustmentDescription Thermistor Mount + INPUTINPUT VcompProcedure EquipmentPower Ref On Zero CalMeasurement Uncertainty Figure 3-4 A2R90 Adjustment LocationProcedure Display Brightness and Contrast AdjustmentIntroduction ServiceDisplay Brightness and Contrast Adjustment Agilent E4418B/E4419B Service GuideAdjustments 3-12Theory of Operation Introduction Theory of OperationIntroduction A1 Power Supply/Battery Charger A1 Power Supply/Battery ChargerA2 Processor Assembly A2 Processor AssemblyAgilent E4418B/E4419B Service Guide The microcontroller circuits that control all the above functions, and A3 Front Panel Assembly pressing System , More , Service , Self Test, IndividualDisplay A4 Comms Assembly A4 Comms AssemblyA5 Daughter Assembly A5 Daughter AssemblyA6 Measurement Assembly A6 Measurement AssemblyAgilent 8480 series power sensors this is 0 V and -10 V at 217 Hz A8 Rechargeable Battery Assembly A8 Rechargeable Battery AssemblyRemove this page and replace with pullout.fm Agilent E4418B/E4419B Service GuideA8 Rechargeable Battery Assembly 4-134-14 Agilent E4418B/E4419B Service GuideA8 Rechargeable Battery Assembly Theory of OperationReplaceable Parts Introduction Replaceable PartsDescription Assembly Part NumbersReference Agilent PartAgilent Part ReferenceDescription DesignatorPower Supply Assembly Types Front Panel Connector Repair Front Panel Connector RepairFirmware Upgrades Downloading FirmwareAssembly and Disassembly Guidelines Removing the Power Meter CoverRemoving the A1 Power Supply Assembly Removing the A2 Processor Assembly n n nRemoving the A4 Comms Assembly screwsRemoving the A5 Daughter or A6 Measurement Assemblies 2. Remove the pins which attach the fan to the chassis Removing the A7 Fan Assembly1. Remove the A1 power supply assembly as shown on page Agilent E4418B/E4419B Service GuideRemoving the Power Meter RAM Battery BT1 This power meter uses a lithium battery which may explode ifbattery terminals or to excessive heat Removing the A3 Front Panel Assembly Replacing the Front Panel Power Sensor Cable Assemblies Front panel sensor retaining clip recess5-17 Agilent E4418B/E4419B Service GuideAssembly and Disassembly Guidelines Replaceable PartsReplacing the Front Panel Power Reference Cable Assembly Rear panel sensor retaining clip recess 5-20 Agilent E4418B/E4419B Service GuideAssembly and Disassembly Guidelines Replaceable PartsReplacing the Rear Panel Power Reference Cable Assembly Option Replacing the Rear Panel Recorder Outputs Cable Assembly Replacing The Chassis Assembly 5-24 Agilent E4418B/E4419B Service GuideAssembly and Disassembly Guidelines Replaceable PartsTroubleshooting Suggested Diagnostic Equipment TroubleshootingIntroduction Connect Sensor to Channel A Any Sensor Errors? TroubleshootingStart Power Up meter POST Pass? Self Test Errors?Introduction TroubleshootingPreset/local Confirm Meas/Setup Limits Limits On TTL Output TTL Output On, Fail O/P LowConnect Sensor to Channel A Any Sensor Errors? TroubleshootingStart Power Up meter POST Pass? Self Test Errors?Agilent E4418B/E4419B Service Guide TroubleshootingIntroduction Any Sensor Errors?Yes TroubleshootingStart Power Up meter POST Errors?Introduction Agilent E4418B/E4419B Service GuideTroubleshooting DualAgilent E4418B/E4419B Service Guide TroubleshootingIntroduction All/Other TroubleshootingIntroduction StartAppendix A Measurement Uncertainty Analysis Instrument Accuracy TestMeasurement Introduction Power MeterUncertainties Define the MeasurandDefine the Measurement Equation Uncertainty Equation u2MA = CTSE ⋅ uTSE 2 + CMV ⋅ u MVStandard Deviation of Power LevelStandard Uncertainty uxi Conversion to Linear UnitsWorst case error on 1V range Worst case error on 0.1V rangeVoltage Error Voltage ErrorPower mW Worst case error on 15.8V maximum power settingVoltage Error DistributionSensitivity Coefficients Ci Combined Standard Uncertainty ucy Expanded Uncertainty kucyMeasurement Uncertainty Analysis - Instrument Accuracy Test Agilent E4416A/E4417A Service GuideA-10 Measurement IntroductionMeasurement Uncertainty Analysis - Power Reference Level Test Appendix BMeasurement Uncertainty Analysis - Power Reference Level Test Define the Measurement Equation Measurement IntroductionDefine the Measurand Pmeas =Figure B-1 Measurement Setup Pmeas = fVcomp,V1,V0,R,CF,MsMsUncertainty = 1 ⁄ 1±2PsPd Uncertainty EquationVoltage Measurements Uncertainty 1 j = ∑i +Voltage measurement Mismatch= ±49.25uV UncertaintyVSWR VSWR +1.05 + Calibration factor Sensor Calibration Factor Driftu Ms = ---------------------------------------------------- = 10ppm of reading + 0.5ppm of range ResistanceRepeatability 200 ⋅ 10 + 5 + 3 1000 ⋅ 0.5 +Measurement ADJUST REFTable B-1 Measurement Repeatability Results REF. LEVEL TESTI mW Power Measured = fVcomp, V1, V0, R, CF, Ms Sensitivity Coefficients CiUsing the above values gives 1.224 ⋅Expanded Uncertainty Combined Standard Uncertainty ucyIndex Page Page Agilent E4418B/E4419B Service Guide Index-4