How to Measure Resistance

Electrical resistance plays an especially vital position in the circuitry of digital devices. Such devices might malfunction if the resistance of their circuitry diverges from the proper level. Nevertheless, electricity shouldn’t be visible. A specialized measuring instrument is critical with a purpose to investigate whether or not a circuit has the proper resistance.

An instrument comparable to a tester is necessary to be able to measure resistance, but how is such measurement carried out? This page provides a detailed introduction to how a tester or multimeter can be utilized to measure resistance.

How is resistance measured?

Resistance is measured utilizing an instrument comparable to an analog multimeter or digital multimeter. Both types of instrument can measure not only resistance, but additionally current, voltage, and other parameters, so they can be used in a variety of situations.

Nevertheless, resistance measurement does not contain measuring the circuit’s resistance value itself. Instead, resistance is calculated by measuring the present and voltage applied to the circuit. When a current is utilized to the circuit under measurement, the circuit (resistance) exhibits a voltage (or more precisely, a voltage drop). Resistance can be calculated by measuring the current and voltage utilizing Ohm’s Law.

Because of this, a circuit’s resistance value will be decided if the current and voltage measured values are known. Analog multimeters and digital multimeters employ the measurement precept of Ohm’s Law to measure resistance.

Resistance measurement with an analog tester

When measuring resistance with an analog multimeter, switch off energy to the circuit under measurement. Plug the red test lead into the positive input terminal with the “+” mark and the black test lead into the COM enter terminal. Switch the instrument to Ω mode and set the range button as appropriate primarily based on the circuit’s anticipated resistance.

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Quick the black and red test pins and set the needle to 0 Ω utilizing the 0 Ω adjustment knob. Then place the red and black test pins in touch with both ends of the circuit under measurement and read the value indicated by the meter.

Keep in mind that applying a voltage to the test leads while the instrument is set to resistance mode might damage the tester. Additionally, in case you are unable to perform 0 Ω correction, the analog multimeter’s battery could also be low. If you happen to encounter this subject, check the battery’s voltage.

Resistance measurement with a digital multimeter

In general, resistance is measured with a digital multimeter in the identical method as with an analog multimeter, and it’s a very simple process. The only distinction is that the value is indicated digitally instead of by an analog needle; in any other case, the basic technique is mostly the same. Nevertheless, digital multimeters assist two measurement methods:

Two-terminal measurement

4-terminal measurement

In most cases, when measuring resistance with a digital multimeter, you’ll use the 2-terminal measurement method. This methodology applies a relentless present and measures the resistance value utilizing the instrument’s voltmeter. This methodology is identical as that used by analog multimeters. Nonetheless, -terminal measurement has the disadvantage of yielding resistance values that include the wiring between the instrument and the circuit under measurement.

To minimize the effects of that additional resistance, the test leads are shorted previous to measurement to zero-adjust the resistance value. Nonetheless, this technique cannot utterly remove the effects. 4-terminal measurement was created to address this shortcoming. Four-terminal measurement uses four test leads and separate voltmeter and ammeter circuits.

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