Fluke 80 Series III user manual WWarning, Measuring AC or DC Current

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80 Series III

Users Manual

Measuring AC or DC Current

WWarning

Never attempt an in-circuit current measurement where the open-circuit potential to earth is greater than 1000 V. You may damage the meter or be injured if the fuse blows during such a measurement.

Caution

To avoid possible damage to the meter or to the equipment under test, check the meter’s fuses before measuring current. Use the proper terminals, function, and range for your measurement. Never place the probes across (in parallel with) any circuit or component when the leads are plugged into the current terminals.

Current is the flow of electrons through a conductor. To measure current, you must break the circuit under test, then place the meter in series with the circuit.

The meter’s current ranges are 400 μA, 4000 μA, 40 mA, 400 mA, 4000 mA, and 10 A. AC current is displayed as an rms value.

To measure current, refer to Figure 7 and proceed as follows:

1.Turn off power to the circuit. Discharge all high- voltage capacitors.

2.Insert the black lead into the COM terminal. For

currents between 4 mA and 400 mA, insert the red lead into the mA/μA terminal. For currents above 400 mA, insert the red lead into the A terminal.

Note

To avoid blowing the meter’s 400 mA fuse, use the mA/μA terminal only if you are sure the current is less than 400 mA.

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Contents
Series Lifetime Limited Warranty Table of Contents Series List of Tables Series List of Figures Series Introduction International Electrical Symbols SeriesSafety Information Your Meter’s Features TerminalInputs Description Switch Position Rotary Switch Positions FunctionButton Function Pushbuttons Button FunctionButton Display Features Model 87 Shown Number Feature Display Features Indication100 ms Display Features Number ΜA, mA ΜF, nF Me, ke Hz, kHz, MHzPower-Up Options Automatic Power-OffInput Alert Feature Making MeasurementsMeasuring AC and DC Voltage Switch Box Testing for Continuity For in-circuit tests, turn circuit power off Measuring Resistance Disconnect Isolating a Resistor Using Conductance for High Resistance or Leakage Tests Measuring CapacitanceMeasuring Capacitance Series Testing Diodes Testing a DiodeWWarning Measuring AC or DC CurrentCurrent through one component Series Measuring Frequency All ranges Measuring Duty Cycle Components of Duty Cycle MeasurementsAnalog Bar Graph Determining Pulse WidthModel 87 Bar Graph 2 Digit Mode Model Models 83 and 85 Bar GraphMIN MAX Recording Mode MIN MAX Functions Touch Hold Mode Relative ModeZoom Mode Models 83 Maintenance Uses for the Zoom Mode Models 83General Maintenance Touch top half Testing the Fuses00.5 Ω Replace fuse OL Input contactsReplacing the Battery Replacing the FusesService and Parts Battery and Fuse Replacement Replacement Parts Fluke Part Or Model NumberQuantity Replaceable Parts Accessories Fluke Part NumberSpecifications Models 85 and 87 AC Voltage Function Specifications KHz 20 kHz2Model 83 AC Voltage Function Specifications Model Current Function Specifications Resolution Model Model 853 Burden Voltage TypicalΜA B Capacitance and Diode Function Specifications Frequency Counter SpecificationsFrequency Counter Sensitivity and Trigger Levels AccuracyElectrical Characteristics of the Terminals MIN MAX Recording Specifications
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