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Fluke 5725A instruction manual Testing the Power Supply By Itself, 7-10

Models: 5725A

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Troubleshooting 7

Testing the Power Supply By Itself

3.Remove plug P301 from J301 and inserting it into J303. Now the high voltage power supply will power up in the ±50V mode. The high voltage amplifier may also be serviced in the ±50V mode.

Testing the Power Supply By Itself

7-10.

To turn on a Power Supply assembly (A4) by itself for troubleshooting, proceed as follows:

1. Turn off the POWER switch and disconnect the line power cord from ac line power.

Warning

Follow the instructions under "initial access procedure" in section 6 to make sure high voltage has been bled off before you touch anything inside the 5725A.

The power supply assembly generates lethal voltages. Use extreme caution when you are working inside the 5725A with the power connected. Use only non-conductive tools, and keep one hand behind your back to avoid making a circuit through your body. If you work on a 5725A with the power cord attached, and/or you are not certain the high voltage has not bled off, do not wear a grounded wrist strap. Wearing a strap increases risk of dangerous electrical shock.

2.Place the Power Supply assembly in the service position as described in the access procedures in Section 6.

3.Plug P301 onto the E302 header where the label MAN appears (pins 2 and 3).

4.This allows momentary-contact pushbutton switch SW302 to generate a strobe signal for U302, turning the supplies on. You turn the supplies off by pressing switch SW301.

5.You may want to troubleshoot in the low-voltage mode by plugging the high voltage secondary plug into J303. The previous procedure describes how to do this.

7-9

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Fluke 5725A instruction manual Testing the Power Supply By Itself, 7-10

Contents

Amplifier 5725AInstruction Manual Page Table of Contents Theory of Operation 5725ACalibration and Verification Instruction Manual 5725ATitle List of TablesTable Instruction Manual 5725ATitle List of FiguresFigure Instruction Manual 5725Aviii Bescheinigung des Herstellers/Importeurs Interference InformationDeclaration of the Manufacturer or Importer Page HIGH VOLTAGE OPERATOR SAFETY SUMMARYLETHAL VOLTAGE Terms in this ManualPower Source Symbols Marked on EquipmentUse the Proper Power Cord Use the Proper FuseFOR QUALIFIED SERVICE PERSONNEL ONLY SERVICING SAFETY SUMMANYDo Not Service Alone Use Care When Servicing With Power OnFree the Victim From the Live Conductor FIRST AID FOR ELECTRIC SHOCKGet Help Never Accept Ordinary and General Tests for DeathChapter Introduction and SpecificationsInstruction Manual 5725AIntroduction Where to Go From Here 5725A Instruction Manual How to Use the Manuals5700A Operator Manual 5700A Operator Reference Guide5700A Service Manual SpecificationsSpecifications Introduction and SpecificationsDC Voltage Range Resolution ±5C from calibration temperatureAC Voltage 5725AInstruction Manual AC Voltage continued Introduction and SpecificationsSpecifications Instruction Manual 5725AAC Voltage continued Voltage RangeSpecifications Introduction and Specifications±5C from calibration temperatureNote TemperatureFour-Wire Two-WireCompFour-Wire 5725A Instruction ManualDC Current Introduction and SpecificationsSpecifications AC Current 5725AInstruction Manual AC Current continued Introduction and SpecificationsSpecifications Resolution Resolution5725A Instruction ManualSpecifications Introduction and SpecificationsGeneral Specifications Temperature performance: Operating: 0C to 50CInstruction Manual 5725AService Information InstallationPlacement and Rack Mounting Connecting to the 5700A CalibratorInstruction Manual 5725AIntroduction Unpacking and InspectionInstallation Instruction Manual 5725ATYPE VOLTAGE/CURRENTPlacement and Rack Mounting Service InformationCooling Considerations Service InformationFigure 2-2.Correct Way to Dress Interface Cable Connecting to the 5700A CalibratorSelecting Line Voltage Selecting Line VoltagewCaution Accessing the FuseConnecting to Line Power Connecting to Line PowerInstruction Manual 5725AChapter Operating NotesInstruction Manual 5725AOperating Notes IntroductionFigure 3-1.Front Panel Features Front Panel FeaturesPOWER 5725ARear Panel Features A B C D E F G HTable 3-1.Front Panel Features 5725A STANDBY IndicatorFigure 3-2.Rear Panel Features Rear Panel Features5725A Instruction ManualTable 3-2.Rear Panel Features A B C D E F G H ICALIBRATION Switch 5700A CALIBRATOR ConnectorWarm Up Turning on the 5725A AmplifierStandby 5725A Operating Functions and ModesVoltage Standby 5725A Operating Functions and Modes Current Standby3-10 Voltage OperateConditions That Activate the 5725A Current Operate3-11 3-12 Conditions That Activate the 5725AChapter Theory of OperationHigh Voltage Amplifier A3 High Voltage Sense Assembly A6High Voltage Heat Sink Assemblies High Voltage Amplifier FeedbackIntroduction Overall Functional DescriptionInstruction Manual Figure 4-1.5725A Overall Block Diagram5725A 1100V AC Range Functional Description 11A Range Functional Description Operation in the 11A AC Range Operation in the 11A DC RangeVoltage and Current Standby Modes Voltage Standby4-10 How the 5700A and 5725A CommunicateDescription of the Out-GuardLines 5725A Side 4-114-12 Description of the In-GuardLines4-13 Functional Summaries by AssemblyDetailed Circuit Description Interconnect Assembly A14-14 4-154-16 Power Supply Assembly A44-17 High Voltage Supply SectionASSEMBLY REF DES4-18 Switching Section4-19 Current-LimitSectionSystem Supply Section 4-20Fan Supply Section Digital Assembly A54-21 4-22Theory of Operation Figure 4-2.Digital Assembly Block DiagramDetailed Circuit Description aq19f.eps4-26 EEROMData Latch 4-27Watchdog Timer Power Up and Reset CircuitryCurrent Amplifier Assembly A2 Break-DetectCircuitryaq20f.eps 5725AInstruction Manual 4-35 Error Amplifier Section4-36 Output Stage SectionMonitor Section 4-37Power Supply Section Control and Switching Section4-38 4-394-40 High Voltage Amplifier A3Input Amplifier 4-41aq22f.eps Theory of OperationDetailed Circuit Description 4-42 IntegratorWindow Comparator 4-434-45 Transconductance and Cascode StageMidstage 4-464-49 Autobias Current SourceAutobias Sense Circuit 4-50Temperature Monitoring Signal TransformersHigh Voltage Amplifier Feedback 4-514-54 High Voltage Sense Assembly A6aq21f.eps Theory of OperationDetailed Circuit Description 4-55 Sense Amplifier Section±3.2V during calibration 4-56 Analog Monitor SectionSIGNAL STANDBY VOLTAGE LIMITS1Serial Interface/Guard Crossing Section Analog Input Switching Section4-57 4-584-59 Control Section4-60 AC Line Voltage Selection SectionInstruction Manual 5725AChapter Calibration and VerificationInstruction Manual 5725ACalibration and Verification Where to Find Further InformationIntroduction Instruction Manual 5725AChapter MaintenanceInstruction Manual 5725AIntroduction Replacing the FuseCleaning the Air Filter General Cleaning General CleaningCleaning PCA’s Figure 6-3.Assembly Location Diagram Access ProceduresA. TOP VIEW B. BOTTOM VIEWwWarning Initial Access ProcedureHIGH VOLTAGE Accessing the Digital Assembly A5 Accessing the Power Supply Assembly A4Figure 6-5.Accessing the Digital Assembly WHEN REINSTALLING DIGITAL ASSEMBLY5725A Instruction Manual6-10 Accessing the Current Amplifier Assembly A2Figure 6-6.Correct Way to Dress Cables Accessing the High Voltage Amplifier A36-11 6-12 Accessing the High Voltage Sense Assembly A6Accessing the Interconnect Assembly A1 Accessing the High Voltage Output Transistors6-13 6-146-15 Enabling Front or Rear Binding Posts9.Reinstall the top cover Chapter TroubleshootingInstruction Manual 5725AIntroduction 5725A Fault CodesSelf Diagnostics FAULT Table 7-1.5725A Fault Codes5725A Instruction Manual MESSAGETable 7-1.5725A Fault Codes cont Self DiagnosticsFAULT MESSAGEManual Tests for Fault Isolation Table 7-2.Analog Monitor Faults Manual Tests for Fault IsolationFAULT NO MESSAGEProblem 3: Fault When Entering Voltage Operate Reduced-VoltageTroubleshooting ModeProblem 4: Fault When Entering Current Standby Problem 5 Fault When Entering Current OperateTesting the Power Supply By Itself Testing the Power Supply By Itself7-10 Instruction Manual 5725AChapter List of Replaceable PartsInstruction Manual 5725AManual Status Information How to Obtain PartsNewer Instruments IntroductionAssembly Name Service CentersTable 8-1.Final Assembly 5725AList of Replaceable Parts Table 8-1.Final Assembly contaq24f.tif Figure 8-1.Final Assembly5725A aq25f.tif Figure 8-1.Final Assembly contList of Replaceable Parts 5725A Figure 8-1.Final Assembly contInstruction Manual aq26f.tifaq27f.tif Figure 8-1.Final Assembly contList of Replaceable Parts 5725A Figure 8-1.Final Assembly contInstruction Manual aq28f.tifaq29f.tif Figure 8-1.Final Assembly contList of Replaceable Parts 5725A Figure 8-1.Final Assembly contInstruction Manual aq30f.tifaq31f.tif Figure 8-1.Final Assembly contList of Replaceable Parts Table 8-2.A1 Interconnect PCA 5725A5725A-1611 List of Replaceable PartsFigure 8-2.A1 Interconnect PCA aq36f.epsTable 8-3.A2 Current Amplifier PCA 5725AInstruction Manual Table 8-3.A2 Current Amplifier PCA cont List of Replaceable PartsInstruction Manual 5725ATable 8-3.A2 Current Amplifier PCA cont Reference Description Designator5725A-1650 List of Replaceable PartsFigure 8-3.A2 Current Amplifier PCA aq37f.epsTable 8-4.A3 High Voltage Amplifier PCA 5725AInstruction Manual Designator List of Replaceable PartsTable 8-4.A3 High Voltage Amplifier PCA cont Instruction Manual 5725ATable 8-4.A3 High Voltage Amplifier PCA cont R640,R6425725A-1661 List of Replaceable PartsFigure 8-4.A3 High Voltage Amplifier PCA aq38f.epsInstruction Manual Table 8-5.A4 Power Supply PCA5725A List of Replaceable Parts Table 8-5.A4 Power Supply PCA cont5725A Table 8-5.A4 Power Supply PCA contInstruction Manual R351 R355 R361,R362List of Replaceable Parts Figure 8-5.A4 Power Supply PCA5725A-1631 aq39f.epsTable 8-6.A5 Digital PCA 5725AInstruction Manual 5725A-1650 List of Replaceable PartsFigure 8-6.A5 Digital PCA aq40f.epsTable 8-7.A6 High Voltage Sense PCA 5725ATable 8-7.A6 High Voltage Sense PCA cont List of Replaceable PartsInstruction Manual 5725ATable 8-7.A6 High Voltage Sense PCA cont R154 R155 R156,R158,R168 R173 R162 R171 R172,R1755725A-1601 List of Replaceable PartsFigure 8-7.A6 High Voltage Sense PCA aq41f.epsInstruction Manual Table 8-8.A12 Transformer Enclosure Assembly5725A aq32f.tif Figure 8-8.A12 Transformer Enclosure AssemblyList of Replaceable Parts aq33f.tif 5725Aaq34f.tif List of Replaceable Partsaq35f.tif 5725AInstruction Manual Table 8-9.A30 Inductor PCA List of Replaceable Parts5725A-1603 Figure 8-9.A30 Inductor PCA5725A Chapter Schematic DiagramsInstruction Manual 5725A5725A-1611 Schematic DiagramsFigure 9-1.A1 Interconnect PCA aq48f.epsFigure 9-1.A1 Interconnect PCA cont 5725AInstruction Manual Figure 9-1.A1 Interconnect PCA cont Schematic DiagramsInstruction Manual 5725AFigure 9-2.A2 Current Amplifier PCA 5725A-1650Figure 9-2.A2 Current Amplifier PCA cont Schematic DiagramsFigure 9-2.A2 Current Amplifier PCA cont 5725AInstruction Manual Figure 9-2.A2 Current Amplifier PCA cont Schematic DiagramsInstruction Manual 5725AFigure 9-3.A3 High Voltage Amplifier PCA 5725A-1661Figure 9-3.A3 High Voltage Amplifier PCA cont Schematic DiagramsFigure 9-3.A3 High Voltage Amplifier PCA cont 5725AInstruction Manual aq59f.eps Schematic DiagramsFigure 9-4.A4 Power Supply PCA 5725A Figure 9-4.A4 Power Supply PCA contFigure 9-4.A4 Power Supply PCA cont Schematic Diagrams5725A AT PINS 12 AND 13 OF U507Instruction Manual TYPICAL COMMUNICATIONS ACTIVITYFigure 9-5.A5 Digital PCA cont Schematic DiagramsInstruction Manual 5725ASTANDBY VOLTAGE STANDBYFigure 9-6.A6 High Voltage Sense PCA cont Schematic DiagramsFigure 9-6.A6 High Voltage Sense PCA cont 5725AInstruction Manual Figure 9-6.A6 High Voltage Sense PCA cont Schematic DiagramsFigure 9-6.A6 High Voltage Sense PCA cont 5725AInstruction Manual aq45f.eps Schematic DiagramsFigure 9-7.A12 Transformer Enclosure Assembly Instruction Manual 5725AIndex 5725A Page Instruction Manual 5725AManual Supplement rear Change #1