Electrical resistance performs a particularly vital function within the circuitry of digital devices. Such units may malfunction if the resistance in their circuitry diverges from the proper level. Nevertheless, electricity is not visible. A specialized measuring instrument is critical to be able to examine whether or not a circuit has the proper resistance.

An instrument similar to a tester is critical in order to measure resistance, but how is such measurement carried out? This page provides an in depth introduction to how a tester or multimeter can be used to measure resistance.

How is resistance measured?
Resistance is measured using an instrument reminiscent of an analog multimeter or digital multimeter. Both types of instrument can measure not only resistance, but also current, voltage, and different parameters, so they can be used in quite a lot of situations.

Nonetheless, resistance measurement doesn't contain measuring the circuit’s resistance value itself. Instead, resistance is calculated by measuring the present and voltage utilized to the circuit. When a current is applied to the circuit under measurement, the circuit (resistance) exhibits a voltage (or more exactly, a voltage drop). Resistance might be calculated by measuring the current and voltage utilizing Ohm’s Law.

As a result, a circuit’s resistance value might be decided if the present and voltage measured values are known. Analog multimeters and digital multimeters make use of the measurement principle of Ohm’s Law to measure resistance.

Resistance measurement with an analog tester
When measuring resistance with an analog multimeter, switch off power 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 based on the circuit’s anticipated resistance.

Brief the black and red test pins and set the needle to 0 Ω using the zero Ω adjustment knob. Then place the red and black test pins in touch with each 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 may damage the tester. Additionally, in case you are unable to perform zero Ω correction, the analog multimeter’s battery may be low. In the event you encounter this difficulty, check the battery's voltage.

Resistance measurement with a digital multimeter
Usually, resistance is measured with a digital multimeter in the same 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 technique is usually the same. However, 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 methodology applies a continuing current and measures the resistance value utilizing the instrument’s voltmeter. This method is identical as that utilized by analog multimeters. Nonetheless, two-terminal measurement has the disadvantage of yielding resistance values that embody the wiring between the instrument and the circuit under measurement.

To reduce the effects of that additional resistance, the test leads are shorted prior to measurement to zero-adjust the resistance value. However, this approach can not fully eliminate the effects. 4-terminal measurement was created to address this shortcoming. Four-terminal measurement makes use of four test leads and separate voltmeter and ammeter circuits.

If you loved this write-up and you would like to obtain more information pertaining to low cost transformer resistance meter kindly browse through our website.