Quote:
Originally Posted by Skywave
Quote:
Originally Posted by terrykc
As RMS stands for the Root Square Mean of a sine wave, . . . .
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No reference is made to the shape of any waveform (electrical or otherwise): deals purely with 'R.M.S' as a mathematical concept.
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My mental model of a 'true RMS' voltmeter or ammeter is that it tells me the heating effect of the measured quantity in a resistive load. So it doesn't fully make sense to me that such a meter would ignore the DC component, which has certainly would have a heating effect!
I'm not at all sure why the manufacturers use AC coupling on true RMS AC ranges. Maybe it makes the RMS conversion easier.
Chris