Electrical resistance plays an extremely vital function in the circuitry of digital devices. Such gadgets may malfunction if the resistance of their circuitry diverges from the proper level. Nonetheless, electricity shouldn’t be visible. A specialized measuring instrument is necessary with a view to investigate whether or not a circuit has the proper resistance.
An instrument resembling a tester is necessary to be able to measure resistance, however 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 reminiscent of an analog multimeter or digital multimeter. Each types of instrument can measure not only resistance, but also current, voltage, and other parameters, to allow them to be used in a wide range of situations.
Nevertheless, resistance measurement doesn’t involve measuring the circuit’s resistance worth itself. Instead, resistance is calculated by measuring the current and voltage applied to the circuit. When a present is utilized to the circuit under measurement, the circuit (resistance) exhibits a voltage (or more precisely, a voltage drop). Resistance could be calculated by measuring the current and voltage using Ohm’s Law.
Consequently, a circuit’s resistance worth might be decided if the present 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 enter 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 based mostly on the circuit’s anticipated resistance.
Quick the black and red test pins and set the needle to zero Ω utilizing the zero Ω adjustment knob. Then place the red and black test pins involved with both ends of the circuit under measurement and read the value indicated by the meter.
Keep in mind that making use of a voltage to the test leads while the instrument is set to resistance mode might damage the tester. Additionally, if you’re unable to perform zero Ω correction, the analog multimeter’s battery could also be low. For those who encounter this situation, check the battery’s voltage.
Resistance measurement with a digital multimeter
Generally, resistance is measured with a digital multimeter in the identical method as with an analog multimeter, and it’s a quite simple process. The only distinction is that the value is indicated digitally instead of by an analog needle; otherwise, the essential method is generally the same. Nonetheless, digital multimeters help measurement methods:
Two-terminal measurement
4-terminal measurement
In most cases, when measuring resistance with a digital multimeter, you’ll use the two-terminal measurement method. This technique applies a continuing current and measures the resistance worth using the instrument’s voltmeter. This methodology is similar as that utilized by analog multimeters. Nonetheless, two-terminal measurement has the disadvantage of yielding resistance values that include the wiring between the instrument and the circuit under measurement.
To reduce the effects of that additional resistance, the test leads are shorted previous to measurement to zero-adjust the resistance value. Nonetheless, this method can’t completely remove the effects. 4-terminal measurement was created to address this shortcoming. Four-terminal measurement makes use of 4 test leads and separate voltmeter and ammeter circuits.
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