Fluke 787 user manual Using the Current Output Functions, Source Mode

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787

Users Manual

Using the Current Output Functions

The meter provides steady, stepped, and ramped current output for testing 0-20 mA and 4-20 mA current loops. You can choose source mode, in which the meter supplies the current, or simulate mode, in which the meter regulates current in an externally-powered current loop.

current into a passive circuit such as a current loop with no loop supply. Source mode depletes the battery faster than simulate mode, so use simulate mode whenever possible.

The display looks the same in source and simulate modes. The way to tell which mode is in use is to see which pair of output jacks is in use.

Source Mode

Source mode is selected automatically by inserting the test leads into the SOURCE + and − jacks as shown in Figure 7. Use source mode whenever you need to supply

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Contents 787 Limited Warranty & Limitation of Liability Table of Contents 787 IndexRead Safety Information before you use the meter IntroductionContacting Fluke Safety Information 787ProcessMeter International Symbols Meaning Symbol MeaningHow to Get Started Fluke 787 ProcessMeterGetting Acquainted with the Meter Input/Output JacksInput/Output Jacks Measurement Functions Source Current FunctionSimulate Transmitter Function Rotary Switch Positions for Measurements Functions Pushbutton ActionsRotary Switch Positions for mA Output Default Function Pushbuttons Pushbuttons FunctionsPushbutton CoarseElements of the Display Element Display MeaningDisplay Element MA, DC, mV, AC Or kΩ, kHz Auto 400100030 Measuring a Composite Signal Measuring Electrical ParametersInput Impedance RangesTesting Diodes Displaying Minimum, Maximum, and AverageUsing TouchHold Compensating for Test Lead ResistanceUsing the Current Output Functions Source ModeSourcing Current Simulate Mode Changing the Current SpanSimulating a Transmitter MA Output Adjust Pushbuttons AdjustmentProducing a Steady mA Output Manually Stepping the mA Output MA Stepping PushbuttonsMA Step Values Value for each span setting To 20 mA Auto Ramping the mA OutputPower-Up Options Power-Up OptionsPushbutton Default Action TakenBattery Life Using the Holster and Flex-StandMaintenance General MaintenanceUsing the Holster and Flex-Stand Replacing the Battery Replacing the BatteryReplacing a Fuse If the Meter does not Work Replacing a FuseReplacement Parts and Accessories Replacement Parts DescriptionFluke PN or Model no QuantityMP8 Specifications ResolutionDC Volts Measurement Range V dcRange mV dc Resolution 400.0 Accuracy % of Reading + Counts DC Millivolts MeasurementAC Volts Measurement AC Current Measurement DC Current MeasurementRange Resolution Ohms MeasurementMeasurement Current Frequency Counter Accuracy Frequency Counter SensitivityInput Range Minimum Sensitivity rms Sinewave 5 Hz to 5 kHz General Specifications Source modeSimulate Mode Diode Test and Continuity TestCertifications CSA, UL, TÜV Index Knob positions, 9 Pushbuttons Loop supply, external Index 787