One of the most basic functions of a DMM is to measure voltage. Testing the voltage is usually the first step in troubleshooting a circuit problem. If there is no voltage or if the voltage is too low or too high, the first thing to do is to fix the power problem before checking further.
The waveform of the AC voltage may be sinusoidal (sine wave) or non-sinusoidal (sawtooth, square, etc.). Many DMMs can display the "rms" (effective value) of AC voltage. The rms value is the value at which the AC voltage is equivalent to the DC voltage.
Many tables have an "average responding" function, which gives valid values when a pure sine wave is input. Such meters cannot accurately measure the rms value of non-sinusoidal waves. DMMs with true-rms function (true-rms) can accurately measure the true-rms value of non-sinusoidal waves.
The ability of a DMM to measure AC voltage is limited by the frequency of the signal being measured. Most DMMs can accurately measure AC voltages from 50 Hz to 500 Hz. However, the AC measurement bandwidth of the DMM can reach hundreds of kilohertz. For AC voltage and current, the frequency range should be consistent with the DMM specification.
GVDA Digital Clamp meter GD118B:
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