Calibration of multimeter
A multimeter must be calibrated by comparing its readings to a reliable and well-known reference source. The steps for calibrating a multimeter are as follows:
Prepare the calibration tools:
You’ll need a reliable reference source that is known and accurate, like a calibration standard, a voltage or current source, or a resistance decade box. Additionally, you ought to have the manufacturer’s instructions for the particular multimeter model you have.
Set the reference source ready:
Using the proper cables or probes, attach the multimeter to the reference source. Before beginning the calibration, make sure the reference source is stable and has stabilised.
Adjust the multimeter:
Set the multimeter to the proper measurement mode (voltage, current, or resistance) after turning it on. For the measurement you are calibrating, set the range selector to its lowest position.
Compare the readings:
Place the reference source and the multimeter side by side and compare the readings on both instruments. If there is a substantial discrepancy in the results, calibrate the multimeter using the controls. While some multimeters have specific calibration controls, others need the internal parts manually adjusted.
Repeat and confirm:
Make sure the readings are consistent by performing the comparison process numerous times. Document the calibration results, including the date, the person who performed the calibration, and the calibration tools used, as soon as you are confident in the multimeter’s accuracy.
Multimeters need to be calibrated on a regular basis, especially if they are used often or in key applications. The manufacturer’s instructions should be consulted for advice on appropriate calibration intervals and techniques