In electronic maintenance, resistance measurement is an important aspect. The measurement of resistance is often carried out under DC conditions, but it is also measured under AC conditions. However, regardless of the measurement situation, it should be ensured that the measured results are accurate and error free. Do you know how to measure resistance? Below, Ouyou Electronics will introduce to you:

Method of measuring resistance:

1. Amperometry method

The ammeter method is a method of calculating resistance using Ohm's law by measuring the current and terminal voltage flowing through the measured resistor.

2. Ohmmeter method

The ohmmeter method is used to measure the resistance of resistors, although the accuracy is not high, it can meet the general requirements for use. This method, due to its convenience, is a commonly used method for measuring resistance. The accuracy of an ohmmeter depends on the accuracy of the ammeter and the stability of the power supply electromotive force, so its accuracy is not high and the measurement error is large. It is necessary to regularly check the ohmmeter for this purpose. The commonly used inspection method is to measure precision resistors (standard resistors) and make corrections after comparison.

3. DC bridge method

The measurement accuracy of the DC bridge method is higher than that of the ohmmeter method. There are many types of electric bridges, and the most commonly used ones are the Wheatstone bridge and the Kelvin bridge. With the development of integrated circuits and digital technology, various new types of resistance measuring instruments have been developed.

4. Digital ohmmeter

Digital ohmmeters convert resistors into voltage, and then use analog-to-digital conversion voltmeters to measure the voltage, and then determine the resistance R to be tested from the voltage. The main testing items for variable resistors and potentiometers are to determine their resistance and whether there is noise when adjusting the center tap position. The commonly used noise detection methods for measuring resistance include the ohmmeter method and the oscilloscope method.

The above content introduces some common methods for measuring resistance. Of course, there are many methods for measuring resistance, and you can choose the method you are familiar with or suitable for measuring resistance. However, regardless of the measurement method used, the accuracy of the measurement result data should be ensured.