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Fluke 45 DC Voltage, Input Impedance, Normal Mode Rejection Ratio, Common Mode Rejection Ratio

Models: 45

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DC Voltage

45

Users Manual

DC Voltage

Range

300 mV

3V

30V

300V

1000 V

100mV

1000 mV

10 V

100V

1000 V

Slow

—

—

—

—

—

1µ V

10µ V

100µ V

1mV

10mV

Resolution

Medium

10µ V

100µ V

1mV

10mV

100mV

—

—

—

—

—

Fast

100µ V

1mV

10mV

100mV

1V

—

—

—

—

—

Accuracy

(6 Months)	(1 Year)

002 % + 2	0.025 % + 2
0.02 % + 2	0.025 % + 2
0.02 % + 2	0.025 % + 2
0.02 % + 2	0.025 % + 2
0.02 % + 2	0.025 % + 2

0.02 % + 6	0.025 % + 6
0.02 % + 6	0.025 % + 6
0.02 % + 6	0.025 % + 6
0.02 % + 6	0.025 % + 6
0.02 % + 6	0.025 % + 6

Input Impedance

10 Me in parallel with <100 pF

Note

In the dual display mode, when the volts ac and volts dc functions are selected, the 10 MΩ dc input divider is in parallel with the 1 MΩ ac divider.

Normal Mode Rejection Ratio

>80 dB at 50 Hz or 60 Hz, slow and medium rates

>54 dB for frequencies between 50-440 Hz, slow and medium rates

>60 dB at 50 Hz, fast rate (Note: Fast rate has no filtering)

Maximum Allowable AC Voltage While Measuring DC Voltage or (AC + DC) Voltages

Range	Max Allowable Peak AC
	Voltage
	Voltage

Peak Normal Mode Signal

300 mV	100 mV	15 V
3 V	1000 mV	15 V
30 V	10 V	1000 V
300 V	100 V	1000 V
1000 V	1000 V	1000 V

* NMRR is the Normal Mode Rejection Ratio

† Normal Mode Rejection Ratio at 50 Hz or 60 Hz ± 0.1 %

NMRR* >80 dB†

15V

15V

50V

50V

200V

NMRR >60 dB†

15V

15V

300V

300V

1000 V

Common Mode Rejection Ratio

>90 dB at do, 50 or 60 Hz, (1 ke unbalanced, medium and slow rates)

Image 103

Fluke 45 user manual DC Voltage, Input Impedance, Normal Mode Rejection Ratio, Common Mode Rejection Ratio

Contents

Dual Display Multimeter LIMITED WARRANTY & LIMITATION OF LIABILITY Interference Information Safety ClassDeclaration of the Manufacturer or Importer Getting Started Table of ContentsTitle IntroductionApplications Operating the Meter Using the Computer InterfaceAppendices MaintenanceTitle List of TablesPerformance Tests for mA Current Functions Replacement PartsPerformance Tests for A Current Functions Title List of FiguresWWarning IntroductionChapter Introducing the Fluke 45 Dual Display MultimeterWhere to go from Here Options and AccessoriesChapter 1 Introduction Appendices Chapter 6 MaintenanceChapter 2 Getting started Chapter 4 ApplicationsPage TO AVOID ELECTRICAL SHOCK OR OTHER INJURY WWARNINGMULTIMETER SAFETY Introduction Adjusting the HandleLine Power Getting StartedFigure 2-2.Rear Panel Figure 2-1.Front PanelTurning the Meter on Using the PushbuttonsFigure 2-4.Summary of Basic Pushbutton Operations WWarning Selecting a Measurement RangeAutomatic Input Terminal Selection Taking Some Basic MeasurementsMeasuring Voltage, Resistance, or Frequency Diode/Continuity TestingMeasuring Current Taking Some Basic Measurements FREQFREQ Getting StartedNote This is a Diode Test Function Figure 2-7.Continuity TestingFigure 2-8.Diode Testing CIRCUITRack Mounting Operating the Meter Under Battery Power OptionalOperating the Meter Under Battery Power Optional 2-10 Introduction Operating the Meter From the Front PanelFront Panel Operations ChapterPrimary Display DisplaySecondary Display MIN HOLD REMOTE SMFMAX dB REL AUTO EXT TRGFigure 3-4.Input Terminals Input TerminalsAutoranging Selecting a Measurement FunctionRanging E, U, TFigure 3-5.Function Selection Buttons Ranging Operating the Meter From the Front PanelManual Ranging Measuring FrequencyFrequency Ranging Measuring Frequency Frequency Measurement RatesFrequency Sensitivity Selection Operating the Meter From the Front PanelK, I, H, J Selecting A Function ModifierSelecting A Function Modifier REL Relative Readings ModifierWWarning Operating the Meter From the Front PaneldB Decibels and Audio Power Modifier HOLD Touch Hold Modifier Using Function Modifiers in CombinationMN MX Minimum Maximum Modifier Selecting A Measurement Rate Rate Using the SButtonPushbuttons Operating the Meter From the Front PanelSelecting A Function Modifier 3-15The List and Number Editors Using The Compare Comp FunctionUsing the List Editor Using the Number Editor Factory Settings of Power-UpConfiguration Power-UpConfigurationChanging the Power-UpConfiguration Calibration Introduction Using the Dual DisplayApplications ChapterUsing Measurement Functions in Combination Applications Using the Dual DisplayResponse Times How the Meter Makes Dual Display Measurements How the Meter Makes Dual Display MeasurementsMeas Function External Trigger Update Rate in the Dual Display ModeThermal Voltages Correcting for Test Lead Resistance When Measuring ResistanceTwo-WireConfiguration True RMS MeasurementsCalculated AC + DC RMS Measurements Effects of Internal Noise in AC Measurements4-11 Figure 4-3.Waveform Comparison ChartApplications True RMS Measurements4-12 Chapter Operating the Meter Using the Computer InterfaceLocal and Remote Operations Computer InterfacesSetting Communication Parameters RS-232 RS-232 Print-OnlyMode RS-232Prompts Device Clear Using C CNTRL CCabling the Meter to a Host or Printer RS-232 Character Echoing and DeletionAddressing the Meter Installing the IEEE-488InterfaceIEEE-488Operating Limitations Enabling the IEEE-488InterfaceCabling the Meter to a Host Getting Started With An Installation TestInstallation Test for RS-232Operations Installation Test for IEEE-488OperationsInput Terminators How the Meter Processes InputIf Test Fails Input StringsTypical IEEE-488Input Strings Sending Command Strings to the MeterSending Numeric Values to the Meter 1.Commands to configure the meter if any Figure 5-1.Typical IEEE-488Input Strings 5-10Triggering Output How the Meter Processes OutputExternal Triggering from the Front Panel External Triggering via the Computer Interface Setting the Trigger Type ConfigurationTable 5-3.Trigger Type Enable Register Event Status Enable RegisterRead Command Write CommandPage 7 6 5 4 Event Status and Event Status Enable RegistersReading the Status Byte Register Status Byte RegisterService Request Enable Register IEEE-488Capabilities and Common Commands Computer Interface Command SetTable 5-8. IEEE-488Interface Function Subsets Table 5-9. IEEE-488Common CommandsCommand 5-20Command Operating the Meter Using the Computer InterfaceComputer Interface Command Set Table 5-10. IEEE-488Common Commands contCommands Function Commands and QueriesFunction Modifier Commands and Queries Table 5-11.Function Commands and QueriesTable 5-12.Function Modifier Commands and Queries Operating the Meter Using the Computer InterfaceComputer Interface Command Set Command5-24 CommandDescription 5-25 Range and Measurement Rate Commands and QueriesOperating the Meter Using the Computer Interface Computer Interface Command SetTRIGGER 5, unexpected results will be obtained Measurement Queries5-26 Trigger Configuration Commands Compare Commands and Queries5-28 Miscellaneous Commands and QueriesCommand Table 5-17.Miscellaneous Commands and QueriesCommand RS-232Remote/Local ConfigurationsOperating the Meter Using the Computer Interface Computer Interface Command Set5-30 Sample Program Using the RS-232Computer Interfaceaam23f.eps 5-31 Operating the Meter Using the Computer Interfaceaam24s.tif aam25s.tif 5-325-33 Operating the Meter Using the Computer Interfaceaam26s.tif aam27s.tif 5-345-35 Operating the Meter Using the Computer InterfaceWWarning MaintenanceCleaning Line FuseCurrent Input Fuses Testing Current Input FusesWWarning Replacing the 100 mA Input FuseReplacing the 10 A Input Fuse WWarningPerformance Tests Self-TestDiagnostics and Error CodesService Frequency FunctionRange Rate Input LevelQuantity Fluke Part Number Part Description Replacement PartsMaintenance Replacement PartsFLUKE PART NO Table 6-5.Replacement Parts cont DESCRIPTIONSpecifications AppendicesAppendix PagePage RS-232and IEEE-488Reading Transfer Rates SpecificationsAppendix A Display Counts and Reading RatesCommon Mode Rejection Ratio DC VoltageInput Impedance Normal Mode Rejection RatioMaximum Input Decibel ResolutionTrue RMS AC Voltage, AC-Coupled AppendicesInput Impedance Decibel Reference ResistanceMaximum Crest Factor AC + DC Voltage AccuracyMaximum Input DC CurrentAC Current AppendicesRangeFrequency AccuracyMaximum Crest Factor Maximum InputInput Protection OhmsDiode Test/Continuity Open Circuit VoltageOpen Circuit Voltage FrequencySensitivity of AC Voltage Sensitivity Level of AC CurrentSpecifications A EnvironmentalAppendices Options GeneralAppendix B ASCII/IEEE-488Bus CodesPage ASCII/IEEE-488Bus Codes B AppendicesIntroduction IEEE-488.2Device Documentation RequirementsAppendix C Implementation of IEEE StandardNUMERIC RESPONSE DATA All queries generate a response when parsedNo commands are coupled Device-specificcommands usedVolts dc Format 1 NR3 NUMERIC RESPONSE DATAFormat 2 NR3 NUMERIC RESPONSE DATA UNIT MEASUREMENTThere are no additional data structures The *RDT and *RAT? commands are not implemented