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Old 11th Oct 2018, 11:22 am   #23
cmjones01
Nonode
 
Join Date: Oct 2008
Location: Warsaw, Poland and Cambridge, UK
Posts: 2,669
Default Re: Full wave rectified RMS voltage

Quote:
Originally Posted by Skywave View Post
Quote:
Originally Posted by terrykc View Post
As RMS stands for the Root Square Mean of a sine wave, . . . .
No reference is made to the shape of any waveform (electrical or otherwise): deals purely with 'R.M.S' as a mathematical concept.
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
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