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Fluke 5725A Access Procedures, A. Top View, B. Bottom View, Front, Lethal Voltage On Output

Models: 5725A

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6-6. Access Procedures

5725A

Instruction Manual

6-6. Access Procedures

Figure 6-3 shows the location of all major modules in the 5725A. View A is a top view, and view B is a bottom view. Both views show the covers removed. The 5725A is constructed so that two modules are completely accessible from the top, and two modules are completely accessible from the bottom. Each of these four modules can be lifted out of the chassis and locked in a service position by pivoting the assembly and inserting two machined pegs into two machined holes in the chassis towards the center of the instrument. (Figure 6-4 shows the High Voltage Amplifier assembly (A3) in the Service position.) Once in the service position, a module can be removed completely by disconnecting all cables attached to it.

HIGH VOLTAGE	DIGITAL	INTERCONNECT			POWER
AMPLIFIER	DIGITAL	INTERCONNECT			SUPPLY
(A3)	(A5)		(A1)		(A4)
A. TOP VIEW		B. BOTTOM VIEW
FRONT			FRONT
	VOLTAGE OUTPUT
	SIGNAL
	TRANSFORMER
CURRENT				HIGH
AMPLIFIER	WARNING			HIGH
AMPLIFIER	WARNING			VOLTAGE
(A2)	LETHAL VOLTAGE ON OUTPUT			VOLTAGE
(A2)	LETHAL VOLTAGE ON OUTPUT			SENSE
	TRANSISTOR HEAT SINKS AND			SENSE
	TRANSISTOR HEAT SINKS AND			(A6)
	MANY OTHER POINTS THROUGHOUT			(A6)
	MANY OTHER POINTS THROUGHOUT
	THE CHASSIS.
					POWER
				TRANSFORMER
					aq15f.eps

Figure 6-3. Assembly Location Diagram

6-6

Image 120

Fluke 5725A Access Procedures, A. Top View, B. Bottom View, Front, Lethal Voltage On Output, Transistor Heat Sinks And

Contents

5725A Instruction ManualAmplifier LIMITED WARRANTY AND LIMITATION OF LIABILITY Table of Contents 5725A Theory of OperationMaintenance TroubleshootingCalibration and Verification Schematic Diagrams How to Obtain PartsService Centers Parts ListsList of Tables TableTitle 5725A 8-15List of Figures FigureTitle 5725A viiiInstruction Manual Interference Information Declaration of the Manufacturer or ImporterBescheinigung des Herstellers/Importeurs Page OPERATOR SAFETY SUMMARY HIGH VOLTAGELETHAL VOLTAGE Terms in this ManualSymbols Marked on Equipment Power SourceUse the Proper Power Cord Use the Proper FuseSERVICING SAFETY SUMMARY FOR QUALIFIED SERVICE PERSONNEL ONLYDo Not Service Alone Use Care When Servicing With Power OnFIRST AID FOR ELECTRIC SHOCK Free the Victim From the Live ConductorGet Help Never Accept Ordinary and General Tests for DeathIntroduction and Specifications Chapter5725A Instruction Manual1-1.Introduction 1-2.Where to Go From Here 1-3.How to Use the Manuals 1-4.5725A Getting Started Manual1-5.5725A Instruction Manual 1-6.5700A/5720A Series II Manual Set1-11.Specifications 1-10.5700A/5720A Series II Service Manual1-12.DC Voltage Specifications Introduction and SpecificationsDC Voltage Specifications 5720A5725A 5700A5700A Instruction ManualIntroduction and Specifications DC Voltage SpecificationsNotes Overshoot 5 %1-13.AC Voltage Specifications 5725A5720A Instruction ManualIntroduction and Specifications AC Voltage Specifications5720A 95 % Confidence Level5725A 5700AInstruction Manual 99 % Confidence LevelIntroduction and Specifications AC Voltage Specifications5700A 95% Confidence Level5725A Instruction ManualRange Introduction and Specifications AC Voltage Specifications5725A Amplifier Figure 1-1. Volt-HertzCapability1-14.Resistance Specifications 5725A5720A 5720AIntroduction and Specifications Resistance Specifications5700A 5700A5725A Instruction ManualIntroduction and Specifications Resistance SpecificationsTable 1-12.Current Derating Factors I < IL1-15.DC Current Specifications 5725A5720A 99% 5720A 95%Introduction and Specifications DC Current Specifications5700A 5700A5725A Instruction ManualNotes Overshoot: <5 %1-16.AC Current Specifications Introduction and SpecificationsAC Current Specifications 5720A 99%5725A 5720A 95%Instruction Manual 95 % Confidence LevelIntroduction and Specifications AC Current Specifications5700A 99 % Confidence Level5725A 5700AInstruction Manual 95 % Confidence LevelIntroduction and Specifications AC Current SpecificationsStability ±1 C Note 5725A 1-28Instruction Manual 1-18.General Specifications Introduction and SpecificationsGeneral Specifications Guard isolation: 201-19.Auxiliary Amplifier Specifications 5220A AC Current, 180-dayspecificationsTemperature Coefficient for 0-18C and 28-50C 5725AInstallation ChapterTitle Page5725A Instruction Manual2-1.Introduction 2-2.Unpacking and InspectionInstallation 5725A Instruction ManualTYPE VOLTAGE/CURRENT2-3.Service Information 2-4.Placement and Rack Mounting2-5.Cooling Considerations Service Information2-6.Connecting to the 5700A Calibrator Figure 2-2.Correct Way to Dress Interface Cable2-7.Selecting Line Voltage Selecting Line Voltage2-8.Accessing the Fuse 2-9.Connecting to Line Power Connecting to Line Power5725A Instruction ManualOperating Notes Chapter5725A Instruction Manual3-1.Introduction Operating Notes3-2.Front Panel Features Figure 3-1.Front Panel FeaturesPOWER 5725AA B C D E F G H Rear Panel FeaturesTable 3-1.Front Panel Features 5725A STANDBY Indicator3-3.Rear Panel Features Figure 3-2.Rear Panel Features5725A Instruction ManualA B C D E F G H Table 3-2.Rear Panel FeaturesCALIBRATION Switch 5700A CALIBRATOR Connector3-4.Turning on the 5725A Amplifier 3-5.Warm Up3-6.5725A Operating Functions and Modes 3-7.StandbyVoltage Standby Current Standby Operating Notes5725A Operating Functions and Modes 3-10 Voltage Operate3-11 Current OperateOperating Notes Conditions That Activate the 5725A3-12.Conditions That Activate the 5725A Theory of Operation ChapterHigh Voltage Sense Assembly A6 High Voltage Amplifier A3High Voltage Heat Sink Assemblies High Voltage Amplifier Feedback4-1.Introduction 4-2.Overall Functional DescriptionFigure 4-1.5725A Overall Block Diagram 5725AInstruction Manual 4-3.1100V AC Range Functional Description 4-4.11A Range Functional Description 4-5.Operation in the 11A DC Range 4-6.Operation in the 11A AC Range4-7.Voltage and Current Standby Modes 4-8.Voltage Standby4-10.How the 5700A and 5725A Communicate 4-11.Description of the Out-GuardLines 5725A Side4-12.Description of the In-GuardLines 4-13.Functional Summaries by Assembly 4-15.Interconnect Assembly A1 4-14.Detailed Circuit Description4-16.Power Supply Assembly A4 4-17.High Voltage Supply Section ASSEMBLYREF DES Table 4-1.Internal Fuse Data4-18.Switching Section 4-19. Current-LimitSection 4-20.System Supply Section4-22.Digital Assembly A5 4-21.Fan Supply Section4-23.Microcomputer 4-24.External RAMFigure 4-2.Digital Assembly Block Diagram Theory of OperationDetailed Circuit Description aq19f.eps4-26.EEROM 4-27.Data Latch4-28.Strobe Lines 4-29.Led Driver4-32.Power Up and Reset Circuitry 4-33.Watchdog Timer4-34.Current Amplifier Assembly A2 4-31. Break-DetectCircuitry5725A Instruction Manualaq20f.eps 4-35.Error Amplifier Section 4-36.Output Stage Section 4-37.Monitor Section4-38.Control and Switching Section 4-39.Power Supply Section4-40.High Voltage Amplifier A3 4-41.Input AmplifierTheory of Operation Detailed Circuit Descriptionaq22f.eps 4-42.Integrator 4-43.Window Comparator4-44.Input Clamp 4-45.Transconductance and Cascode Stage 4-46.Midstage4-47.Midstage -400VFilter 4-48.High Voltage Heat Sink Assemblies4-49.Autobias Current Source 4-50.Autobias Sense Circuit4-52.Signal Transformers 4-53.Temperature Monitoring4-51.High Voltage Amplifier Feedback Table 4-2.Signal Transformer Usage4-54.High Voltage Sense Assembly A6 Theory of Operation Detailed Circuit Descriptionaq21f.eps 4-55.Sense Amplifier Section ±3.2V during calibration 4-56.Analog Monitor Section SIGNALSTANDBY VOLTAGE LIMITS1 PHYSICAL4-58.Analog Input Switching Section 4-57.Serial Interface/Guard Crossing Section4-59.Control Section 4-60.AC Line Voltage Selection Section 5725A Instruction ManualCalibration and Verification Chapter5725A Instruction Manual5-2.Where to Find Further Information 5-1.IntroductionCalibration and Verification 5725A Instruction Manualstatic awareness Fluke CorporationA Message From 6.DO NOT SLIDE S.S. DEVICES OVER ANY SURFACE Maintenance Chapter5725A Instruction Manual6-1.Introduction 6-2.Replacing the Fuse6-3.Cleaning the Air Filter 6-4.General Cleaning 6-5.Cleaning PCA’sGeneral Cleaning 6-6.Access Procedures Figure 6-3.Assembly Location DiagramA. TOP VIEW B. BOTTOM VIEW6-7.Initial Access Procedure HIGH VOLTAGE 6-8.Accessing the Power Supply Assembly A4 6-9.Accessing the Digital Assembly A5WHEN REINSTALLING DIGITAL ASSEMBLY Figure 6-5.Accessing the Digital Assembly5725A Instruction Manual6-10.Accessing the Current Amplifier Assembly A2 6-11.Accessing the High Voltage Amplifier A3 Figure 6-6.Correct Way to Dress Cables6-12.Accessing the High Voltage Sense Assembly A6 6-14.Accessing the Interconnect Assembly A1 6-15.Enabling Front or Rear Binding Posts 9.Reinstall the top cover Troubleshooting Chapter5725A 7-2.5725A Fault Codes 7-3.Self Diagnostics7-1.Introduction Table 7-1.5725A Fault Codes FAULT5725A Instruction Manual MESSAGESelf Diagnostics Table 7-1.5725A Fault Codes contFAULT MESSAGE7-4.Manual Tests for Fault Isolation Manual Tests for Fault Isolation Table 7-2.Analog Monitor FaultsFAULT NO MESSAGE7-9. Reduced-VoltageTroubleshooting Mode 7-10.Testing the Power Supply By Itself Testing the Power Supply By Itself5725A Instruction ManualList of Replaceable Parts Chapter5725A Instruction Manual8-2.How to Obtain Parts 8-5.Service Centers8-1.Introduction 8-3.Manual Status Information8-6.Parts Lists Assembly NameTable 8-2.Final Assembly 5725AParts Lists Table 8-2.Final Assembly contList of Replaceable Parts Table 8-2.Final Assembly cont 5725AInstruction Manual TM1 W1 W13 W14 W15 W16 W44 XF501Parts Lists Figure 8-1.Final AssemblyList of Replaceable Parts aq24f.tifFigure 8-1.Final Assembly cont 5725AInstruction Manual aq25f.tifParts Lists Figure 8-1.Final Assembly contList of Replaceable Parts aq26f.tifFigure 8-1.Final Assembly cont 5725AInstruction Manual aq27f.tifParts Lists Figure 8-1.Final Assembly contList of Replaceable Parts aq28f.tifFigure 8-1.Final Assembly cont 5725AInstruction Manual aq29f.tifParts Lists Figure 8-1.Final Assembly contList of Replaceable Parts aq30f.tifFigure 8-1.Final Assembly cont 5725AInstruction Manual aq31f.tifParts Lists List of Replaceable PartsTable 8-3.A1 Interconnect PCA 5725A Instruction Manual5725A-1611 Figure 8-2.A1 Interconnect PCAParts Lists List of Replaceable PartsTable 8-4.A2 Current Amplifier PCA 5725A Instruction ManualTable 8-4.A2 Current Amplifier PCA cont Reference Description DesignatorParts Lists List of Replaceable PartsTable 8-4.A2 Current Amplifier PCA cont R233,R237,R238 R273 R243,R244 R247,R2485725A 5725A-1650Figure 8-3.A2 Current Amplifier PCA aq37f.epsParts Lists List of Replaceable PartsTable 8-5.A3 High Voltage Amplifier PCA 5725A Table 8-5.A3 High Voltage Amplifier PCA contParts Lists List of Replaceable PartsTable 8-5.A3 High Voltage Amplifier PCA cont R640,R642 R641,R648 R643 R647 R651 R654,R661,R6845725A Instruction Manual5725A-1661 Figure 8-4.A3 High Voltage Amplifier PCAParts Lists Table 8-6.A4 Power Supply PCAList of Replaceable Parts Reference DesignatorTable 8-6.A4 Power Supply PCA cont 5725AInstruction Manual ReferenceParts Lists Table 8-6.A4 Power Supply PCA contList of Replaceable Parts R351 R355 R361,R362Figure 8-5.A4 Power Supply PCA 5725AInstruction Manual 5725A-1631Parts Lists List of Replaceable PartsTable 8-7.A5 Digital PCA Reference5725A Instruction Manual5725A-1650 Figure 8-6.A5 Digital PCAParts Lists List of Replaceable PartsTable 8-8.A6 High Voltage Sense PCA 5725A Instruction ManualTable 8-8.A6 High Voltage Sense PCA cont Parts Lists List of Replaceable PartsTable 8-8.A6 High Voltage Sense PCA cont R154 R155 R156,R158,R168 R173 R162 R171 R172,R1755725A Instruction Manual5725A-1601 Figure 8-7.A6 High Voltage Sense PCAParts Lists Table 8-9.A12 Transformer Enclosure AssemblyList of Replaceable Parts Figure 8-8.A12 Transformer Enclosure Assembly 5725Aaq32f.tif Parts Lists List of Replaceable Partsaq33f.tif 5725A Instruction Manualaq34f.tif Parts Lists List of Replaceable Partsaq35f.tif 5725A Instruction ManualTable 8-10.A30 Inductor PCA Figure 8-9.A30 Inductor PCASchematic Diagrams Chapter5725A Schematic Diagrams 5725A-1611Figure 9-1.A1 Interconnect PCA aq48f.eps5725A Instruction ManualFigure 9-1.A1 Interconnect PCA cont Schematic Diagrams Figure 9-1.A1 Interconnect PCA cont5725A Instruction ManualFigure 9-2.A2 Current Amplifier PCA 5725A-1650Schematic Diagrams Figure 9-2.A2 Current Amplifier PCA cont5725A Instruction ManualFigure 9-2.A2 Current Amplifier PCA cont Schematic Diagrams Figure 9-2.A2 Current Amplifier PCA cont5725A Instruction ManualFigure 9-3.A3 High Voltage Amplifier PCA 5725A-1661Schematic Diagrams Figure 9-3.A3 High Voltage Amplifier PCA cont5725A Instruction ManualFigure 9-3.A3 High Voltage Amplifier PCA cont Schematic Diagrams Figure 9-4.A4 Power Supply PCAaq59f.eps Figure 9-4.A4 Power Supply PCA cont 5725AInstruction Manual Schematic Diagrams Figure 9-4.A4 Power Supply PCA contAT PINS 12 AND 13 OF U507 5725AInstruction Manual TYPICAL COMMUNICATIONS ACTIVITYSchematic Diagrams Figure 9-5.A5 Digital PCA cont5725A Instruction ManualSTANDBY VOLTAGE STANDBYSchematic Diagrams Figure 9-6.A6 High Voltage Sense PCA cont5725A Instruction ManualFigure 9-6.A6 High Voltage Sense PCA cont Schematic Diagrams Figure 9-6.A6 High Voltage Sense PCA cont5725A Instruction ManualFigure 9-6.A6 High Voltage Sense PCA cont Schematic Diagrams Figure 9-7.A12 Transformer Enclosure Assemblyaq45f.eps 5725A Instruction ManualIndex 5725A Page 5725A