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Fluke 5725A instruction manual Theory of Operation, Detailed Circuit Description, aq21f.eps

Models: 5725A

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Theory of Operation 4

Detailed Circuit Description

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Figure 4-5. High Voltage Sense Assembly Block Diagram

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Fluke 5725A instruction manual Theory of Operation, Detailed Circuit Description, aq21f.eps

Contents

Amplifier 5725AInstruction Manual LIMITED WARRANTY AND LIMITATION OF LIABILITY Table of Contents Theory of Operation 5725ACalibration and Verification MaintenanceTroubleshooting How to Obtain Parts Schematic DiagramsService Centers Parts ListsTitle List of TablesTable 8-15 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 SUMMARYDo 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 5725A1-1.Introduction 1-2.Where to Go From Here 1-4.5725A Getting Started Manual 1-3.How to Use the Manuals1-5.5725A Instruction Manual 1-6.5700A/5720A Series II Manual Set1-10.5700A/5720A Series II Service Manual 1-11.SpecificationsIntroduction and Specifications 1-12.DC Voltage SpecificationsDC Voltage Specifications 5720A5700A 5725A5700A Instruction ManualDC Voltage Specifications Introduction and SpecificationsNotes Overshoot 5 %5725A 1-13.AC Voltage Specifications5720A Instruction ManualAC Voltage Specifications Introduction and Specifications5720A 95 % Confidence Level5700A 5725AInstruction Manual 99 % Confidence LevelAC Voltage Specifications Introduction and Specifications5700A 95% Confidence LevelRange 5725AInstruction Manual AC Voltage Specifications Introduction and Specifications5725A Amplifier Figure 1-1. Volt-HertzCapability5725A 1-14.Resistance Specifications5720A 5720AResistance Specifications Introduction and Specifications5700A 5700AInstruction Manual 5725AResistance Specifications Introduction and SpecificationsTable 1-12.Current Derating Factors I < IL5725A 1-15.DC Current Specifications5720A 99% 5720A 95%DC Current Specifications Introduction and Specifications5700A 5700AInstruction Manual 5725ANotes Overshoot: <5 %Introduction and Specifications 1-16.AC Current SpecificationsAC Current Specifications 5720A 99%5720A 95% 5725AInstruction Manual 95 % Confidence LevelAC Current Specifications Introduction and Specifications5700A 99 % Confidence Level5700A 5725AInstruction Manual 95 % Confidence LevelStability ±1 C Note Introduction and SpecificationsAC Current Specifications Instruction Manual 5725A1-28 Introduction and Specifications 1-18.General SpecificationsGeneral Specifications Guard isolation: 205220A AC Current, 180-dayspecifications 1-19.Auxiliary Amplifier SpecificationsTemperature Coefficient for 0-18C and 28-50C 5725AChapter InstallationTitle PageInstruction Manual 5725AInstallation 2-1.Introduction2-2.Unpacking and Inspection Instruction Manual 5725ATYPE VOLTAGE/CURRENT2-4.Placement and Rack Mounting 2-3.Service Information2-5.Cooling Considerations Service InformationFigure 2-2.Correct Way to Dress Interface Cable 2-6.Connecting to the 5700A CalibratorSelecting Line Voltage 2-7.Selecting Line Voltage2-8.Accessing the Fuse Connecting to Line Power 2-9.Connecting to Line PowerInstruction Manual 5725AChapter Operating NotesInstruction Manual 5725AOperating Notes 3-1.IntroductionFigure 3-1.Front Panel Features 3-2.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 3-3.Rear Panel Features5725A Instruction ManualTable 3-2.Rear Panel Features A B C D E F G HCALIBRATION Switch 5700A CALIBRATOR Connector3-5.Warm Up 3-4.Turning on the 5725A Amplifier3-7.Standby 3-6.5725A Operating Functions and ModesVoltage Standby 5725A Operating Functions and Modes Current StandbyOperating Notes Voltage Operate 3-10Current Operate 3-11Operating Notes Conditions That Activate the 5725A3-12.Conditions That Activate the 5725A Chapter Theory of OperationHigh Voltage Amplifier A3 High Voltage Sense Assembly A6High Voltage Heat Sink Assemblies High Voltage Amplifier Feedback4-2.Overall Functional Description 4-1.IntroductionInstruction Manual Figure 4-1.5725A Overall Block Diagram5725A 4-3.1100V AC Range Functional Description 4-4.11A Range Functional Description 4-6.Operation in the 11A AC Range 4-5.Operation in the 11A DC Range4-7.Voltage and Current Standby Modes 4-8.Voltage Standby4-11.Description of the Out-GuardLines 5725A Side 4-10.How the 5700A and 5725A Communicate4-12.Description of the In-GuardLines 4-13.Functional Summaries by Assembly 4-14.Detailed Circuit Description 4-15.Interconnect Assembly A14-16.Power Supply Assembly A4 ASSEMBLY 4-17.High Voltage Supply SectionREF DES Table 4-1.Internal Fuse Data4-18.Switching Section 4-20.System Supply Section 4-19. Current-LimitSection4-21.Fan Supply Section 4-22.Digital Assembly A54-23.Microcomputer 4-24.External RAMTheory of Operation Figure 4-2.Digital Assembly Block DiagramDetailed Circuit Description aq19f.eps4-27.Data Latch 4-26.EEROM4-28.Strobe Lines 4-29.Led Driver4-33.Watchdog Timer 4-32.Power Up and Reset Circuitry4-34.Current Amplifier Assembly A2 4-31. Break-DetectCircuitryaq20f.eps 5725AInstruction Manual 4-35.Error Amplifier Section 4-37.Monitor Section 4-36.Output Stage Section4-39.Power Supply Section 4-38.Control and Switching Section4-41.Input Amplifier 4-40.High Voltage Amplifier A3aq22f.eps Theory of OperationDetailed Circuit Description 4-44.Input Clamp 4-42.Integrator4-43.Window Comparator 4-46.Midstage 4-45.Transconductance and Cascode Stage4-47.Midstage -400VFilter 4-48.High Voltage Heat Sink Assemblies4-50.Autobias Sense Circuit 4-49.Autobias Current Source4-53.Temperature Monitoring 4-52.Signal Transformers4-51.High Voltage Amplifier Feedback Table 4-2.Signal Transformer Usage4-54.High Voltage Sense Assembly A6 aq21f.eps Theory of OperationDetailed Circuit Description 4-55.Sense Amplifier Section ±3.2V during calibration SIGNAL 4-56.Analog Monitor SectionSTANDBY VOLTAGE LIMITS1 PHYSICAL4-57.Serial Interface/Guard Crossing Section 4-58.Analog Input Switching Section4-59.Control Section 4-60.AC Line Voltage Selection Section Instruction Manual 5725AChapter Calibration and VerificationInstruction Manual 5725ACalibration and Verification 5-2.Where to Find Further Information5-1.Introduction Instruction Manual 5725AA Message From static awarenessFluke Corporation 6.DO NOT SLIDE S.S. DEVICES OVER ANY SURFACE Chapter MaintenanceInstruction Manual 5725A6-2.Replacing the Fuse 6-1.Introduction6-3.Cleaning the Air Filter General Cleaning 6-4.General Cleaning6-5.Cleaning PCA’s Figure 6-3.Assembly Location Diagram 6-6.Access ProceduresA. TOP VIEW B. BOTTOM VIEW6-7.Initial Access Procedure HIGH VOLTAGE 6-9.Accessing the Digital Assembly A5 6-8.Accessing the Power Supply Assembly A4Figure 6-5.Accessing the Digital Assembly WHEN REINSTALLING DIGITAL ASSEMBLY5725A Instruction Manual6-10.Accessing the Current Amplifier Assembly A2 Figure 6-6.Correct Way to Dress Cables 6-11.Accessing the High Voltage Amplifier A36-12.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 Chapter Troubleshooting5725A 7-1.Introduction 7-2.5725A Fault Codes7-3.Self Diagnostics FAULT Table 7-1.5725A Fault Codes5725A Instruction Manual MESSAGETable 7-1.5725A Fault Codes cont Self DiagnosticsFAULT MESSAGE7-4.Manual Tests for Fault Isolation Table 7-2.Analog Monitor Faults Manual Tests for Fault IsolationFAULT NO MESSAGE7-9. Reduced-VoltageTroubleshooting Mode Testing the Power Supply By Itself 7-10.Testing the Power Supply By ItselfInstruction Manual 5725AChapter List of Replaceable PartsInstruction Manual 5725A8-5.Service Centers 8-2.How to Obtain Parts8-1.Introduction 8-3.Manual Status InformationAssembly Name 8-6.Parts ListsTable 8-2.Final Assembly 5725AList of Replaceable Parts Parts ListsTable 8-2.Final Assembly cont 5725A Table 8-2.Final Assembly contInstruction Manual TM1 W1 W13 W14 W15 W16 W44 XF501Figure 8-1.Final Assembly Parts ListsList of Replaceable Parts aq24f.tif5725A Figure 8-1.Final Assembly contInstruction Manual aq25f.tifFigure 8-1.Final Assembly cont Parts ListsList of Replaceable Parts aq26f.tif5725A Figure 8-1.Final Assembly contInstruction Manual aq27f.tifFigure 8-1.Final Assembly cont Parts ListsList of Replaceable Parts aq28f.tif5725A Figure 8-1.Final Assembly contInstruction Manual aq29f.tifFigure 8-1.Final Assembly cont Parts ListsList of Replaceable Parts aq30f.tif5725A Figure 8-1.Final Assembly contInstruction Manual aq31f.tifTable 8-3.A1 Interconnect PCA Parts ListsList of Replaceable Parts Instruction Manual 5725A5725A-1611 Figure 8-2.A1 Interconnect PCATable 8-4.A2 Current Amplifier PCA Parts ListsList of Replaceable Parts Instruction Manual 5725ATable 8-4.A2 Current Amplifier PCA cont Reference Description DesignatorList of Replaceable Parts Parts ListsTable 8-4.A2 Current Amplifier PCA cont R233,R237,R238 R273 R243,R244 R247,R2485725A-1650 5725AFigure 8-3.A2 Current Amplifier PCA aq37f.epsTable 8-5.A3 High Voltage Amplifier PCA Parts ListsList of Replaceable Parts Table 8-5.A3 High Voltage Amplifier PCA cont 5725AList of Replaceable Parts Parts ListsTable 8-5.A3 High Voltage Amplifier PCA cont R640,R642 R641,R648 R643 R647 R651 R654,R661,R684Instruction Manual 5725A5725A-1661 Figure 8-4.A3 High Voltage Amplifier PCATable 8-6.A4 Power Supply PCA Parts ListsList of Replaceable Parts Reference Designator5725A Table 8-6.A4 Power Supply PCA contInstruction Manual ReferenceTable 8-6.A4 Power Supply PCA cont Parts ListsList of Replaceable Parts R351 R355 R361,R3625725A Figure 8-5.A4 Power Supply PCAInstruction Manual 5725A-1631List of Replaceable Parts Parts ListsTable 8-7.A5 Digital PCA ReferenceInstruction Manual 5725A5725A-1650 Figure 8-6.A5 Digital PCATable 8-8.A6 High Voltage Sense PCA Parts ListsList of Replaceable Parts Table 8-8.A6 High Voltage Sense PCA cont 5725AInstruction Manual List of Replaceable Parts Parts ListsTable 8-8.A6 High Voltage Sense PCA cont R154 R155 R156,R158,R168 R173 R162 R171 R172,R175Instruction Manual 5725A5725A-1601 Figure 8-7.A6 High Voltage Sense PCAList of Replaceable Parts Parts ListsTable 8-9.A12 Transformer Enclosure Assembly aq32f.tif Figure 8-8.A12 Transformer Enclosure Assembly5725A aq33f.tif Parts ListsList of Replaceable Parts aq34f.tif 5725AInstruction Manual aq35f.tif Parts ListsList of Replaceable Parts Instruction Manual 5725ATable 8-10.A30 Inductor PCA Figure 8-9.A30 Inductor PCAChapter Schematic Diagrams5725A 5725A-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 Instruction Manual Figure 9-4.A4 Power Supply PCA cont5725A Figure 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 5725A