Fluke 80 Series III user manual Measuring Resistance

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80 Series III

Users Manual

Measuring Resistance

Caution

To avoid possible damage to the meter or to the equipment under test, disconnect circuit power and discharge all high-voltage capacitors before measuring resistance.

Resistance is an opposition to current flow. The unit of resistance is the ohm (Ω). The meter measures resistance by sending a small current through the circuit. Because this current flows through all possible paths between the probes, the resistance reading represents the total resistance of all paths between the probes.

The meter’s resistance ranges are 400 Ω, 4 kΩ, 40 kΩ, 400 kΩ, 4 MΩ, and 40 MΩ.

To measure resistance, set up the meter as shown in Figure 4.

The following are some tips for measuring resistance:

∙Because the meter’s test current flows through all possible paths between the probe tips, the measured value of a resistor in a circuit is often different from the resistor’s rated value.

∙The test leads can add 0.1 Ω to 0.2 Ω of error to resistance measurements. To test the leads, touch the probe tips together and read the resistance of the leads. If necessary, you can use the relative (REL) mode to automatically subtract this value.

∙The resistance function can produce enough voltage to forward-bias silicon diode or transistor junctions,

causing them to conduct. To avoid this, do not use the 40 MΩ range for in-circuit resistance measurements.

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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 ResistorUsing 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 Testing the Fuses 00.5 Ω Replace fuse OLTouch top half 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

80 Series III specifications

The Fluke 80 Series III digital multimeters are renowned for their robust engineering, precision, and versatility, making them a staple in the toolkit of electricians, engineers, and technicians. Launched by Fluke Corporation, a leading manufacturer of electronic test tools, the 80 Series III has set a benchmark in the multimeter industry for its reliability and performance.

One of the standout features of the Fluke 80 Series III is its wide measurement capabilities. The device can accurately measure AC and DC voltage, DC current, resistance, frequency, and capacitance. This comprehensive feature set allows users to tackle a variety of tasks, from simple household electrical checks to complex industrial applications. The meter's high input impedance prevents loading effects on circuits, ensuring accurate readings, especially in sensitive electronic applications.

Fluke's proprietary True-RMS technology is another defining characteristic of the 80 Series III. This technology ensures that the multimeter provides accurate readings for both non-linear loads and distorted waveforms, which are common in many modern electrical systems. This capability is particularly valuable in diagnosing issues in variable frequency drives, inverters, and other electronic systems that do not present traditional sinusoidal waveforms.

Durability is a key factor in the design of the Fluke 80 Series III. The multimeter is housed in a rugged, impact-resistant case that can withstand the rigors of fieldwork. It features a built-in protective holster with a probe holder, enhancing portability while safeguarding the device against drops and bumps. Furthermore, the 80 Series III boasts an IP67 rating for dust and water resistance, ensuring reliable performance in adverse conditions.

User-friendliness is also a significant aspect of the Fluke 80 Series III. The large, easy-to-read display, combined with intuitive controls, allows users to navigate its functions with ease. The multimeter features a backlight, enabling use in dimly lit environments, while the hold function ensures that readings can be captured and displayed even after disconnecting the probes.

In addition to these features, the Fluke 80 Series III offers various models to cater to specific needs, such as the 87V for highly accurate measurements in industrial environments and the 86V for temperature measurements with added thermocouple support. Each model maintains the high standards of quality and performance that Fluke is known for.

In summary, the Fluke 80 Series III digital multimeters combine advanced features, high accuracy, and rugged durability, making them indispensable tools for professionals who require reliable performance in challenging environments. Whether for routine maintenance or complex troubleshooting, the 80 Series III offers everything necessary to meet the demands of today’s electrical tasks.
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