How to Test and Calibrate a DMM

Digital multimeters are used to test the voltage, amperage or resistance of a circuit. If you are having problems with your DMM, there are a few things that you can do before you buy a new one. Testing the DMM with a known source is the best way to determine whether or not the unit is working properly. If the DMM is not calibrated properly, you can use the self-calibration setting on the unit.

9V battery

Instructions

- 1
  Turn on your DMM and switch the toggle knob to the “Voltage” setting on the meter.
- 2
  Test your DMM against a brand new 9V battery. Hold the red lead to the “+” terminal on the battery and hold the black lead to the “-“ terminal on the battery. Determine if the DMM is working properly by the readout on the display.
- 3
  Change the toggle to the “SELFCAL” setting if the reading is less than 9V.
- 4
  Hold the leads to the battery terminals and wait for the multimeter to read “9V” on the display. The meter is now calibrated.

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