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Fluke 45 user manual Replacing the 100 mA Input Fuse, Replacing the 10 A Input Fuse, WWarning

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Replacing the 100 mA Input Fuse

Maintenance 6

Current Input Fuses

If the fuse is good, the meter will read between .04 Ω and 1.0 Ω . If the fuse is blown, the meter will read >10 MΩ to OL.

Replacing the 100 mA Input Fuse

WWarning

For protection against fire or arc flash, replace a blown fuse only with one of identical rating.

The 100 mA input fuse is mounted in the front panel input jack (see Figure 6-2).

To replace this fuse, first unplug the line cord. Then press in on the input jack and turn it 90 degrees counter-clockwise as shown in Figure 6-2. Slide out the fuse holder and fuse.

Replace a blown fuse with one of identical rating (see Table 6-5) and reinsert the fuse and holder into the input terminal socket. Secure the fuse holder by pressing in and turning the holder 90 degrees clockwise.

F1 Fuse (500 mA, 250V, Fast Blow)

1500 A Minimum Breaking Capacity

	Front Panel Input Terminal
V
600V
1000V CAT					10A	100 mA Input Socket
COM	CAT				10A
	CAT

					100
	FUSE				mA
	FUSE				F1
		500			F1
	FUSED	F		mA
	FUSED		250V

Fuse Holder

To remove, push in and turn counter clockwise.

To insert, reverse this procedure.

qb13f.eps

Figure 6-2. Replacing the 100 mA Input Fuse

Replacing the 10 A Input Fuse

The 10 A input fuse is located inside the meter. To replace the fuse:

1.Remove the single Phillips-head screw on the bottom of the case and the Phillips - head screw on each side of the rear bezel.

WWarning

Opening the case may expose hazardous voltages. To avoid electric shock, always disconnect the power cord and measuring inputs before opening the case.

2.Remove the bezel and slip the case back from the front of the meter. The fuse and fuse clip are visible at the front of the main printed circuit assembly (pca) near the input terminals.

6-3

Image 94

Fluke 45 user manual Replacing the 100 mA Input Fuse, Replacing the 10 A Input Fuse, WWarning

Contents

Dual Display Multimeter LIMITED WARRANTY & LIMITATION OF LIABILITY Interference Information Safety ClassDeclaration of the Manufacturer or Importer Introduction Table of ContentsTitle Getting StartedOperating the Meter Using the Computer Interface ApplicationsMaintenance AppendicesList of Tables TitlePerformance Tests for mA Current Functions Replacement PartsPerformance Tests for A Current Functions List of Figures TitleIntroducing the Fluke 45 Dual Display Multimeter IntroductionChapter WWarningWhere to go from Here Options and AccessoriesChapter 1 Introduction Chapter 4 Applications Chapter 6 MaintenanceChapter 2 Getting started AppendicesPage TO AVOID ELECTRICAL SHOCK OR OTHER INJURY WWARNINGMULTIMETER SAFETY Getting Started Adjusting the HandleLine Power IntroductionFigure 2-1.Front Panel Figure 2-2.Rear PanelUsing the Pushbuttons Turning the Meter onFigure 2-4.Summary of Basic Pushbutton Operations Taking Some Basic Measurements Selecting a Measurement RangeAutomatic Input Terminal Selection WWarningMeasuring Voltage, Resistance, or Frequency Diode/Continuity TestingMeasuring Current Getting Started FREQFREQ Taking Some Basic MeasurementsCIRCUIT Figure 2-7.Continuity TestingFigure 2-8.Diode Testing Note This is a Diode Test FunctionRack Mounting Operating the Meter Under Battery Power OptionalOperating the Meter Under Battery Power Optional 2-10 Chapter Operating the Meter From the Front PanelFront Panel Operations IntroductionPrimary Display DisplaySecondary Display EXT TRG REMOTE SMFMAX dB REL AUTO MIN HOLDInput Terminals Figure 3-4.Input TerminalsE, U, T Selecting a Measurement FunctionRanging AutorangingFigure 3-5.Function Selection Buttons Operating the Meter From the Front Panel RangingManual Ranging Measuring FrequencyFrequency Ranging Operating the Meter From the Front Panel Frequency Measurement RatesFrequency Sensitivity Selection Measuring FrequencySelecting A Function Modifier K, I, H, JOperating the Meter From the Front Panel REL Relative Readings ModifierWWarning Selecting A Function ModifierdB Decibels and Audio Power Modifier HOLD Touch Hold Modifier Using Function Modifiers in CombinationMN MX Minimum Maximum Modifier Using the SButton Selecting A Measurement Rate Rate3-15 Operating the Meter From the Front PanelSelecting A Function Modifier PushbuttonsUsing The Compare Comp Function The List and Number EditorsUsing the List Editor Using the Number Editor Factory Settings of Power-UpConfiguration Power-UpConfigurationChanging the Power-UpConfiguration Calibration Chapter Using the Dual DisplayApplications IntroductionUsing Measurement Functions in Combination Using the Dual Display ApplicationsResponse Times How the Meter Makes Dual Display Measurements How the Meter Makes Dual Display MeasurementsMeas Function Update Rate in the Dual Display Mode External TriggerThermal Voltages True RMS Measurements When Measuring ResistanceTwo-WireConfiguration Correcting for Test Lead ResistanceEffects of Internal Noise in AC Measurements Calculated AC + DC RMS MeasurementsTrue RMS Measurements Figure 4-3.Waveform Comparison ChartApplications 4-114-12 Computer Interfaces Operating the Meter Using the Computer InterfaceLocal and Remote Operations ChapterSetting Communication Parameters RS-232 RS-232 Print-OnlyMode Character Echoing and Deletion Device Clear Using C CNTRL CCabling the Meter to a Host or Printer RS-232 RS-232PromptsEnabling the IEEE-488Interface Installing the IEEE-488InterfaceIEEE-488Operating Limitations Addressing the MeterInstallation Test for IEEE-488Operations Getting Started With An Installation TestInstallation Test for RS-232Operations Cabling the Meter to a HostInput Strings How the Meter Processes InputIf Test Fails Input TerminatorsTypical IEEE-488Input Strings Sending Command Strings to the MeterSending Numeric Values to the Meter 1.Commands to configure the meter if any 5-10 Figure 5-1.Typical IEEE-488Input StringsTriggering Output How the Meter Processes OutputExternal Triggering from the Front Panel Setting the Trigger Type Configuration External Triggering via the Computer InterfaceTable 5-3.Trigger Type Write Command Event Status Enable RegisterRead Command Enable RegisterPage Event Status and Event Status Enable Registers 7 6 5 4Status Byte Register Reading the Status Byte RegisterService Request Enable Register Computer Interface Command Set IEEE-488Capabilities and Common Commands5-20 Table 5-9. IEEE-488Common CommandsCommand Table 5-8. IEEE-488Interface Function SubsetsTable 5-10. IEEE-488Common Commands cont Operating the Meter Using the Computer InterfaceComputer Interface Command Set CommandTable 5-11.Function Commands and Queries Function Commands and QueriesFunction Modifier Commands and Queries CommandsCommand Operating the Meter Using the Computer InterfaceComputer Interface Command Set Table 5-12.Function Modifier Commands and Queries5-24 CommandDescription Computer Interface Command Set Range and Measurement Rate Commands and QueriesOperating the Meter Using the Computer Interface 5-25TRIGGER 5, unexpected results will be obtained Measurement Queries5-26 Compare Commands and Queries Trigger Configuration CommandsTable 5-17.Miscellaneous Commands and Queries Miscellaneous Commands and QueriesCommand 5-28Computer Interface Command Set RS-232Remote/Local ConfigurationsOperating the Meter Using the Computer Interface Command5-30 Sample Program Using the RS-232Computer Interfaceaam23f.eps 5-31 Operating the Meter Using the Computer Interfaceaam24s.tif 5-32 aam25s.tif5-33 Operating the Meter Using the Computer Interfaceaam26s.tif 5-34 aam27s.tifOperating the Meter Using the Computer Interface 5-35Line Fuse MaintenanceCleaning WWarningTesting Current Input Fuses Current Input FusesWWarning Replacing the 100 mA Input FuseReplacing the 10 A Input Fuse WWarningSelf-TestDiagnostics and Error Codes Performance TestsService Input Level FunctionRange Rate FrequencyReplacement Parts Replacement PartsMaintenance Quantity Fluke Part Number Part DescriptionTable 6-5.Replacement Parts cont DESCRIPTION FLUKE PART NOPage AppendicesAppendix SpecificationsPage Display Counts and Reading Rates SpecificationsAppendix A RS-232and IEEE-488Reading Transfer RatesNormal Mode Rejection Ratio DC VoltageInput Impedance Common Mode Rejection RatioAppendices Decibel ResolutionTrue RMS AC Voltage, AC-Coupled Maximum InputAC + DC Voltage Accuracy Decibel Reference ResistanceMaximum Crest Factor Input ImpedanceAppendices DC CurrentAC Current Maximum InputMaximum Input AccuracyMaximum Crest Factor RangeFrequencyOpen Circuit Voltage OhmsDiode Test/Continuity Input ProtectionSensitivity Level of AC Current FrequencySensitivity of AC Voltage Open Circuit VoltageSpecifications A EnvironmentalAppendices General OptionsASCII/IEEE-488Bus Codes Appendix BPage Appendices ASCII/IEEE-488Bus Codes BImplementation of IEEE Standard IEEE-488.2Device Documentation RequirementsAppendix C IntroductionDevice-specificcommands used All queries generate a response when parsedNo commands are coupled NUMERIC RESPONSE DATAMEASUREMENT Format 1 NR3 NUMERIC RESPONSE DATAFormat 2 NR3 NUMERIC RESPONSE DATA UNIT Volts dcThe *RDT and *RAT? commands are not implemented There are no additional data structures