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Fluke 5725A instruction manual High Voltage

Models: 5725A

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HIGH VOLTAGE

5725A

Instruction Manual

		HIGH VOLTAGE
		AMPLIFIER
		(A3)
			LED
	TP307		CR317
LED	TP304		TP301
CR318			TP301
CR318
			POWER
		MODE
		CURRENTSTANDBY
		5725A
		FAULT	FRONT PANEL
		OVERLOADOFF	FRONT PANEL
		OVERLOADOFF
		CABLE
		11A
		MAX
		2OV
		PK
		MAX
		POWER SUPPLY
			(A4)
			aq16f.eps

Figure 6-4. Initial Access Procedure

6.Verify that both LEDs CR317 and CR318 on the Power Supply assembly (A4) are off. If either is lit after three minutes, there is a fault in the high voltage capacitor bleed-off path. Do not rely on an off condition as an indication that dangerous voltage no longer exists on the filter capacitors.

Warning

Do not rely on the power supply leds as an indication of the presence of high voltage. Always use a voltmeter to check for high voltage between TP307 and TP301, and between TP307 and TP304.

7.To confirm that high voltage has dissipated, set a DMM to the 1000V dc range, and take a reading with the common lead to TP307 and the high lead to TP301 on the Power Supply assembly. This is the +400V filter capacitor test point, and it should be at a safe level near zero.

6-8

Image 108

Fluke 5725A instruction manual High Voltage

Contents

5725A Instruction ManualAmplifier Page Table of Contents 5725A Theory of OperationCalibration and Verification 5725A Instruction ManualList of Tables TableTitle 5725A List 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 SUMMANY 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 ManualIntroduction Where to Go From Here How to Use the Manuals 5700A Operator Manual5700A Operator Reference Guide 5700A Remote Programming Reference GuideSpecifications 5700A Service ManualIntroduction and Specifications SpecificationsDC Voltage Range Resolution Absolute Uncertainty5725A Instruction ManualAC Voltage Introduction and Specifications SpecificationsAC Voltage continued 5725A Instruction ManualAC Voltage continued Voltage RangeIntroduction and Specifications SpecificationsTwo-WireAdder active compensation Note Lead Resistance Nominal ValueTwo-WireComp Four-WireFour-Wire 5725A Instruction ManualIntroduction and Specifications SpecificationsDC Current 5725A Instruction ManualAC Current Introduction and Specifications SpecificationsAC Current continued Resolution Resolution5725A Instruction ManualIntroduction and Specifications SpecificationsGeneral Specifications Temperature performance: Operating: 0C to 50C5725A Instruction ManualInstallation Service InformationPlacement and Rack Mounting Connecting to the 5700A Calibrator5725A Instruction ManualUnpacking and Inspection InstallationIntroduction 5725A Instruction ManualTYPE VOLTAGE/CURRENTService Information Placement and Rack MountingCooling Considerations Service InformationConnecting to the 5700A Calibrator Figure 2-2.Correct Way to Dress Interface CableSelecting Line Voltage Selecting Line VoltageAccessing the Fuse wCautionConnecting to Line Power Connecting to Line Power5725A Instruction ManualOperating Notes Chapter5725A Instruction ManualIntroduction Operating NotesFront 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 IndicatorRear Panel Features Figure 3-2.Rear Panel Features5725A Instruction ManualA B C D E F G H I Table 3-2.Rear Panel FeaturesCALIBRATION Switch 5700A CALIBRATOR ConnectorTurning on the 5725A Amplifier Warm Up5725A Operating Functions and Modes StandbyVoltage Standby Current Standby 5725A Operating Functions and ModesVoltage Operate 3-10Current Operate 3-11Conditions That Activate the 5725A Conditions That Activate the 5725A 3-12Theory of Operation ChapterHigh Voltage Sense Assembly A6 High Voltage Amplifier A3High Voltage Heat Sink Assemblies High Voltage Amplifier FeedbackOverall Functional Description IntroductionFigure 4-1.5725A Overall Block Diagram 5725AInstruction Manual 1100V AC Range Functional Description 11A Range Functional Description Operation in the 11A DC Range Operation in the 11A AC RangeVoltage and Current Standby Modes Voltage StandbyHow the 5700A and 5725A Communicate 4-10Description of the Out-GuardLines 5725A Side 4-11Description of the In-GuardLines 4-12Functional Summaries by Assembly 4-13Interconnect Assembly A1 Detailed Circuit Description4-14 4-15Power Supply Assembly A4 4-16High Voltage Supply Section 4-17ASSEMBLY REF DESSwitching Section 4-18Current-LimitSection 4-19System Supply Section 4-20Digital Assembly A5 Fan Supply Section4-21 4-22Figure 4-2.Digital Assembly Block Diagram Theory of OperationDetailed Circuit Description aq19f.epsEEROM 4-26Data Latch 4-27Power Up and Reset Circuitry Watchdog TimerCurrent Amplifier Assembly A2 Break-DetectCircuitry5725A Instruction Manualaq20f.eps Error Amplifier Section 4-35Output Stage Section 4-36Monitor Section 4-37Control and Switching Section Power Supply Section4-38 4-39High Voltage Amplifier A3 4-40Input Amplifier 4-41Theory of Operation Detailed Circuit Descriptionaq22f.eps Integrator 4-42Window Comparator 4-43Transconductance and Cascode Stage 4-45Midstage 4-46Autobias Current Source 4-49Autobias Sense Circuit 4-50Signal Transformers High Voltage Amplifier Feedback4-51 4-52High Voltage Sense Assembly A6 4-54Theory of Operation Detailed Circuit Descriptionaq21f.eps Sense Amplifier Section 4-55±3.2V during calibration Analog Monitor Section 4-56SIGNAL STANDBY VOLTAGE LIMITS1Analog Input Switching Section Serial Interface/Guard Crossing Section4-57 4-58Control Section 4-59AC Line Voltage Selection Section 4-605725A Instruction ManualCalibration and Verification Chapter5725A Instruction ManualWhere to Find Further Information IntroductionCalibration and Verification 5725A Instruction ManualMaintenance Chapter5725A Instruction ManualReplacing the Fuse IntroductionCleaning the Air Filter General Cleaning Cleaning PCA’sGeneral Cleaning Access Procedures Figure 6-3.Assembly Location DiagramA. TOP VIEW B. BOTTOM VIEWInitial Access Procedure wWarningHIGH VOLTAGE Accessing the Power Supply Assembly A4 Accessing the Digital Assembly A5WHEN REINSTALLING DIGITAL ASSEMBLY Figure 6-5.Accessing the Digital Assembly5725A Instruction ManualAccessing the Current Amplifier Assembly A2 6-10Accessing the High Voltage Amplifier A3 6-11Figure 6-6.Correct Way to Dress Cables Accessing the High Voltage Sense Assembly A6 6-12Accessing the High Voltage Output Transistors Accessing the Interconnect Assembly A16-13 6-14Enabling Front or Rear Binding Posts 6-159.Reinstall the top cover Troubleshooting Chapter5725A Instruction Manual5725A Fault Codes Self DiagnosticsIntroduction Table 7-1.5725A Fault Codes FAULT5725A Instruction Manual MESSAGESelf Diagnostics Table 7-1.5725A Fault Codes contFAULT MESSAGEManual Tests for Fault Isolation Manual Tests for Fault Isolation Table 7-2.Analog Monitor FaultsFAULT NO MESSAGEReduced-VoltageTroubleshooting Mode Problem 3: Fault When Entering Voltage OperateProblem 4: Fault When Entering Current Standby Problem 5 Fault When Entering Current OperateTesting the Power Supply By Itself 7-10Testing the Power Supply By Itself 5725A Instruction ManualList of Replaceable Parts Chapter5725A Instruction ManualHow to Obtain Parts Manual Status InformationNewer Instruments IntroductionService Centers Assembly NameTable 8-1.Final Assembly 5725ATable 8-1.Final Assembly cont List of Replaceable PartsFigure 8-1.Final Assembly 5725Aaq24f.tif Figure 8-1.Final Assembly cont List of Replaceable Partsaq25f.tif Figure 8-1.Final Assembly cont 5725AInstruction Manual aq26f.tifFigure 8-1.Final Assembly cont List of Replaceable Partsaq27f.tif Figure 8-1.Final Assembly cont 5725AInstruction Manual aq28f.tifFigure 8-1.Final Assembly cont List of Replaceable Partsaq29f.tif Figure 8-1.Final Assembly cont 5725AInstruction Manual aq30f.tifFigure 8-1.Final Assembly cont List of Replaceable Partsaq31f.tif 5725A Table 8-2.A1 Interconnect PCAList of Replaceable Parts 5725A-1611Figure 8-2.A1 Interconnect PCA aq36f.eps5725A Instruction ManualTable 8-3.A2 Current Amplifier PCA List of Replaceable Parts Table 8-3.A2 Current Amplifier PCA cont5725A Instruction ManualTable 8-3.A2 Current Amplifier PCA cont Reference Description DesignatorList of Replaceable Parts 5725A-1650Figure 8-3.A2 Current Amplifier PCA aq37f.eps5725A Instruction ManualTable 8-4.A3 High Voltage Amplifier PCA List of Replaceable Parts Table 8-4.A3 High Voltage Amplifier PCA contDesignator 5725A Instruction ManualTable 8-4.A3 High Voltage Amplifier PCA cont R640,R642List of Replaceable Parts 5725A-1661Figure 8-4.A3 High Voltage Amplifier PCA aq38f.epsTable 8-5.A4 Power Supply PCA 5725AInstruction Manual Table 8-5.A4 Power Supply PCA cont List of Replaceable PartsTable 8-5.A4 Power Supply PCA cont 5725AInstruction Manual R351 R355 R361,R362Figure 8-5.A4 Power Supply PCA List of Replaceable Parts5725A-1631 aq39f.eps5725A Instruction ManualTable 8-6.A5 Digital PCA List of Replaceable Parts 5725A-1650Figure 8-6.A5 Digital PCA aq40f.eps5725A Table 8-7.A6 High Voltage Sense PCAList of Replaceable Parts Table 8-7.A6 High Voltage Sense PCA cont5725A Instruction ManualTable 8-7.A6 High Voltage Sense PCA cont R154 R155 R156,R158,R168 R173 R162 R171 R172,R175List of Replaceable Parts 5725A-1601Figure 8-7.A6 High Voltage Sense PCA aq41f.epsTable 8-8.A12 Transformer Enclosure Assembly 5725AInstruction Manual Figure 8-8.A12 Transformer Enclosure Assembly List of Replaceable Partsaq32f.tif 5725A aq33f.tifList of Replaceable Parts aq34f.tif5725A Instruction Manualaq35f.tif List of Replaceable Parts Table 8-9.A30 Inductor PCA5725A-1603 Figure 8-9.A30 Inductor PCA5725A Schematic Diagrams Chapter5725A Instruction ManualSchematic 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 5725ASchematic 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 STANDBYVOLTAGE STANDBY CURRENT 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 Instruction ManualManual Supplement Change #1 rear