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Fluke 5725A instruction manual Accessing the Fuse, wCaution

Models: 5725A

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Accessing the Fuse

5725A

Instruction Manual

Accessing the Fuse

2-8.

wCaution

To prevent instrument damage, verify that the correct fuse is installed for the line voltage setting. Acceptable fuse types are Bussman type MTH or Littelfuse type 312 or equivalent, of the appropriate amperage rating. Use only a 4A, 250V fast-blow fuse when the line voltage selection switches are set in the range 200-240V.

Note

A spare 4A, 250V fuse is shipped with the 5725A to ensure that one is available for use on the 200-240V range.

The line power fuse is accessible on the rear panel. The fuse rating label to the right of the fuse holder (labeled FUSE) shows the correct replacement fuse rating for each line voltage setting. To check or replace the fuse, refer to Figure 2-4 and proceed as follows:

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

2.Insert the blade of a standard screwdriver in the slot of the fuse holder labeled FUSE.

3.Turn the screwdriver counterclockwise until the cap and fuse pop free.

4.To reinstall the fuse, reverse this procedure.

WARNING GROUNDING

CONNECTOR IN POWER CORD

MUST BE CONNECTED TO

ENSURE PROTECTION FROM

ELECTRONIC SHOCK.

47-63 Hz 750VA MAX

!

FUSE

CHASSIS

GROUND

S2

CAUTION FOR FIRE PROTECTION REPLACE ONLY WITH A 250V FUSE OF INDICATED RATING.

	VOLTAGE	FUSE
	SELECTION	FUSE
	SELECTION

S2	S3	S4
100V		!
110V		F8A 250V
115V		(FAST)
120V
S2	S3	S4
200V		!
220V		F4A 250V
230V		(FAST)
240V
S3		S4

JOHN FLUKE MFG. CO., INC.

MADE IN U.S.A.

PATENTS PENDING

	NO INTERNAL USER SERVICEABLE							CURRENT
	NO INTERNAL USER SERVICEABLE							OUTPUT
	PARTS REFER SERVICE TO							OUTPUT
	QUALIFIED SERVICE PERSONNEL
	TO CLEAN FILTER
	REMOVE FROM INSTRUMENT							HI
	AND FLUSH WITH WARM
	SOAPY WATER							11A MAX
								11A MAX

						20V PK		LO
							MAX



	5700A CALIBRATOR

CALIBRATION

ENABLE NORMAL

aq5f.eps

Figure 2-4. Accessing the Fuse

2-8

Image 42

Fluke 5725A instruction manual Accessing the Fuse, wCaution

Contents

5725A Instruction ManualAmplifier Page Table of Contents 5725A Theory of OperationCalibration and Verification 5725A Instruction ManualList of Tables TableTitle 5725A Instruction ManualList of Figures FigureTitle 5725A viiiInstruction Manual Interference Information Declaration of the Manufacturer or ImporterBescheinigung des Herstellers/Importeurs Page LETHAL VOLTAGE OPERATOR SAFETY SUMMARYHIGH VOLTAGE Terms in this ManualUse the Proper Power Cord Symbols Marked on EquipmentPower Source Use the Proper FuseDo Not Service Alone SERVICING SAFETY SUMMANYFOR QUALIFIED SERVICE PERSONNEL ONLY Use Care When Servicing With Power OnGet Help FIRST AID FOR ELECTRIC SHOCKFree the Victim From the Live Conductor Never Accept Ordinary and General Tests for DeathIntroduction and Specifications Chapter5725A Instruction ManualIntroduction Where to Go From Here 5700A Operator Manual How to Use the Manuals5725A Instruction Manual 5700A Operator Reference GuideSpecifications 5700A Service ManualDC Voltage Range Resolution Introduction and SpecificationsSpecifications ±5C from calibration temperature5725A Instruction ManualAC Voltage Introduction and Specifications SpecificationsAC Voltage continued AC Voltage continued 5725AInstruction Manual Voltage Range±5C from calibration temperatureNote Introduction and SpecificationsSpecifications TemperatureFour-Wire Two-WireCompFour-Wire 5725A Instruction ManualIntroduction and Specifications SpecificationsDC Current 5725A Instruction ManualAC Current Introduction and Specifications SpecificationsAC Current continued 5725A ResolutionResolution Instruction ManualGeneral Specifications Introduction and SpecificationsSpecifications Temperature performance: Operating: 0C to 50C5725A Instruction ManualPlacement and Rack Mounting InstallationService Information Connecting to the 5700A Calibrator5725A Instruction ManualUnpacking and Inspection InstallationIntroduction TYPE 5725AInstruction Manual VOLTAGE/CURRENTCooling Considerations Service InformationPlacement and Rack Mounting 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 NotesPOWER Front Panel FeaturesFigure 3-1.Front Panel Features 5725ATable 3-1.Front Panel Features A B C D E F G HRear Panel Features 5725A STANDBY Indicator5725A Rear Panel FeaturesFigure 3-2.Rear Panel Features Instruction ManualCALIBRATION Switch A B C D E F G H ITable 3-2.Rear Panel Features 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 Heat Sink Assemblies High Voltage Sense Assembly A6High Voltage Amplifier A3 High Voltage Amplifier FeedbackOverall Functional Description IntroductionFigure 4-1.5725A Overall Block Diagram 5725AInstruction Manual 1100V AC Range Functional Description 11A Range Functional Description Voltage and Current Standby Modes Operation in the 11A DC RangeOperation in the 11A AC Range Voltage StandbyDescription of the Out-GuardLines 5725A Side How the 5700A and 5725A Communicate4-10 4-11Description of the In-GuardLines 4-12Functional Summaries by Assembly 4-134-14 Interconnect Assembly A1Detailed Circuit Description 4-15Power Supply Assembly A4 4-16ASSEMBLY High Voltage Supply Section4-17 REF DESSwitching Section 4-18System Supply Section Current-LimitSection4-19 4-204-21 Digital Assembly A5Fan Supply Section 4-22Detailed Circuit Description Figure 4-2.Digital Assembly Block DiagramTheory of Operation aq19f.epsData Latch EEROM4-26 4-27Current Amplifier Assembly A2 Power Up and Reset CircuitryWatchdog Timer Break-DetectCircuitry5725A Instruction Manualaq20f.eps Error Amplifier Section 4-35Monitor Section Output Stage Section4-36 4-374-38 Control and Switching SectionPower Supply Section 4-39Input Amplifier High Voltage Amplifier A34-40 4-41Theory of Operation Detailed Circuit Descriptionaq22f.eps Window Comparator Integrator4-42 4-43Midstage Transconductance and Cascode Stage4-45 4-46Autobias Sense Circuit Autobias Current Source4-49 4-50High Voltage Amplifier Feedback Signal TransformersTemperature Monitoring 4-51High Voltage Sense Assembly A6 4-54Theory of Operation Detailed Circuit Descriptionaq21f.eps Sense Amplifier Section 4-55±3.2V during calibration SIGNAL Analog Monitor Section4-56 STANDBY VOLTAGE LIMITS14-57 Analog Input Switching SectionSerial Interface/Guard Crossing Section 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 A. TOP VIEW Access ProceduresFigure 6-3.Assembly Location Diagram B. BOTTOM VIEWInitial Access Procedure wWarningHIGH VOLTAGE Accessing the Power Supply Assembly A4 Accessing the Digital Assembly A55725A WHEN REINSTALLING DIGITAL ASSEMBLYFigure 6-5.Accessing the Digital Assembly 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 6-126-13 Accessing the High Voltage Output TransistorsAccessing the Interconnect Assembly A1 6-14Enabling Front or Rear Binding Posts 6-159.Reinstall the top cover Troubleshooting Chapter5725A Instruction Manual5725A Fault Codes Self DiagnosticsIntroduction 5725A Instruction Manual Table 7-1.5725A Fault CodesFAULT MESSAGEFAULT Self DiagnosticsTable 7-1.5725A Fault Codes cont MESSAGEManual Tests for Fault Isolation FAULT NO Manual Tests for Fault IsolationTable 7-2.Analog Monitor Faults MESSAGEProblem 4: Fault When Entering Current Standby Reduced-VoltageTroubleshooting ModeProblem 3: Fault When Entering Voltage Operate 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 ManualNewer Instruments How to Obtain PartsManual Status Information IntroductionTable 8-1.Final Assembly Service CentersAssembly Name 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 Instruction Manual Figure 8-1.Final Assembly cont5725A aq26f.tifFigure 8-1.Final Assembly cont List of Replaceable Partsaq27f.tif Instruction Manual Figure 8-1.Final Assembly cont5725A aq28f.tifFigure 8-1.Final Assembly cont List of Replaceable Partsaq29f.tif Instruction Manual Figure 8-1.Final Assembly cont5725A aq30f.tifFigure 8-1.Final Assembly cont List of Replaceable Partsaq31f.tif 5725A Table 8-2.A1 Interconnect PCAFigure 8-2.A1 Interconnect PCA List of Replaceable Parts5725A-1611 aq36f.eps5725A Instruction ManualTable 8-3.A2 Current Amplifier PCA List of Replaceable Parts Table 8-3.A2 Current Amplifier PCA contTable 8-3.A2 Current Amplifier PCA cont 5725AInstruction Manual Reference Description DesignatorFigure 8-3.A2 Current Amplifier PCA List of Replaceable Parts5725A-1650 aq37f.eps5725A Instruction ManualTable 8-4.A3 High Voltage Amplifier PCA List of Replaceable Parts Table 8-4.A3 High Voltage Amplifier PCA contDesignator Table 8-4.A3 High Voltage Amplifier PCA cont 5725AInstruction Manual R640,R642Figure 8-4.A3 High Voltage Amplifier PCA List of Replaceable Parts5725A-1661 aq38f.epsTable 8-5.A4 Power Supply PCA 5725AInstruction Manual Table 8-5.A4 Power Supply PCA cont List of Replaceable PartsInstruction Manual Table 8-5.A4 Power Supply PCA cont5725A R351 R355 R361,R3625725A-1631 Figure 8-5.A4 Power Supply PCAList of Replaceable Parts aq39f.eps5725A Instruction ManualTable 8-6.A5 Digital PCA Figure 8-6.A5 Digital PCA List of Replaceable Parts5725A-1650 aq40f.eps5725A Table 8-7.A6 High Voltage Sense PCAList of Replaceable Parts Table 8-7.A6 High Voltage Sense PCA contTable 8-7.A6 High Voltage Sense PCA cont 5725AInstruction Manual R154 R155 R156,R158,R168 R173 R162 R171 R172,R175Figure 8-7.A6 High Voltage Sense PCA List of Replaceable Parts5725A-1601 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 5725A-1603 List of Replaceable PartsTable 8-9.A30 Inductor PCA Figure 8-9.A30 Inductor PCA5725A Schematic Diagrams Chapter5725A Instruction ManualFigure 9-1.A1 Interconnect PCA Schematic Diagrams5725A-1611 aq48f.eps5725A Instruction ManualFigure 9-1.A1 Interconnect PCA cont Schematic Diagrams Figure 9-1.A1 Interconnect PCA contFigure 9-2.A2 Current Amplifier PCA 5725AInstruction Manual 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 contFigure 9-3.A3 High Voltage Amplifier PCA 5725AInstruction Manual 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 contInstruction Manual AT PINS 12 AND 13 OF U5075725A TYPICAL COMMUNICATIONS ACTIVITYSchematic Diagrams Figure 9-5.A5 Digital PCA contSTANDBY 5725AInstruction Manual 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 Instruction ManualManual Supplement Change #1 rear