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In the two-wire method, the multimeter applies a small current to the component under test through the red (positive) and black (negative) test leads. The multimeter measures the voltage drop across the component using its internal circuitry. The multimeter calculates the resistance based on the measured voltage and the known current value.
Sep 14, 2023 · 3. Turn on the multimeter and select the best testing range. The resistance of a component can range from ohms (1 ohm) to megaohms (1,000,000 ohms). In order to get an accurate reading of resistance you must set the multimeter to the proper range for your component.
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Plug the red or yellow lead into the resistance input jack. Select the resistance setting. Touch the probe tips across the component or portion of the circuit. View the reading and note the unit of measurement, ohms, kilohms, or megohms. Resistance Measurement Procedures. Follow the steps below to measure resistance:
Electrical resistance can be measured by using either a multimeter or an ohmmeter. A multimeter is a multifunctional tool that can measure voltage, current, resistance, and other types of electrical measurements, depending on the style of the multimeter. An ohmmeter only measures resistance. Units of Measurement for Electrical Resistance
Plug the red test lead into the positive input terminal with the “+” mark and the black test lead into the COM input terminal. Switch the instrument to Ω mode and set the range button as appropriate based on the circuit’s anticipated resistance. Short the black and red test pins and set the needle to 0 Ω using the 0 Ω adjustment knob.
To measure resistance: 1. Turn power to circuit OFF. If a circuit includes a capacitor, discharge the capacitor before taking any resistance reading. 2. Turn digital multimeter dial to resistance, or ohms, which often shares a spot on the dial with one or more other test/measurement modes (continuity, capacitance or diode; see illustration below).
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Jun 21, 2015 · The most common and simplest way to measure resistance is with a digital multimeter, or DMM. This indispensable device knows all about Ohm’s law and is happy to do the work for you: when you connect the terminals of the resistor to the two probes, it supplies a known current, measures the resulting voltage drop, and calculates the resistance.
