How to Measure Resistance with a Multimeter and the Precautions for Resistance Measurement
A wide variety of components are used in industrial applications, each with its respective operating‑requirements. As a commonly‑used industrial measuring instrument, a multimeter also requires proper handling during operation.
Important Considerations for Measuring Resistance with a Multimeter
Multimeters are divided into two types: traditional analog multimeters and digital multimeters. The traditional analog multimeter adopts pointer electromagnetic‑deflection. It requires mechanical zero‑adjustment before each use. Its operation is cumbersome, and readings are subjective and inaccurate, so it is seldom used today.
Digital multimeters display numerical values directly without scale reading, delivering relatively accurate results, and represent the mainstream type in current use.
Precautions for Measuring Resistance with a Multimeter
① Perform mechanical zero‑adjustment before use. With no measured signal applied, adjust the multimeter pointer to the zero‑voltage or zero‑current position.
② Do not touch the metal portions of the test‑leads during measurement. This ensures both measurement accuracy and personal safety.
③ Do not switch ranges while taking measurements. This is particularly critical for high‑voltage or high‑current measurements; otherwise the multimeter may be damaged. If range switching is required, disconnect the test‑leads first, change the range, and then resume measurement.
④ Place the multimeter horizontally during operation to avoid measurement errors. In addition, keep the instrument away from interference caused by external magnetic fields.
⑤ After use, set the selector switch to the maximum AC‑voltage range. If the multimeter will not be used for an extended period, remove its internal battery to prevent battery‑induced corrosion of internal components.
A multimeter is a multi‑function, multi‑range measuring instrument. It can measure resistance as well as DC voltage. As an important industrial measuring tool, being familiar with these measurement precautions allows the instrument to deliver optimal performance.
