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New Member
Hi everybody,
When one measures AC voltage with multimeter it is :
RMS or E Peak or E Average?

E peak = RMS x 1.414
E Average = RMS x 0.9



Well-Known Member
Most Helpful Member
Unless the voltmeter is specifically stated to be true RMS responding, then it responds to the average value of the waveform but is calibrated to display the RMS value of a sine-wave (1.1 times the average measurement). Thus for any waveform other than a sine-wave it will be in error, the amount of error depending upon how much difference there is between it's average and RMS values as compared to a sine-wave.
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