RMS means Root of the Means Squared. It is primarily used in the measurement of non sinusoidal waveforms where the effective value is the norm for pure sinusoidal waves. Both are intended to measure the equivalent heating effect of straight DC so that you have a comparison heating effect.
So an RMS meter takes a sampling of the instantaneous voltages and squares them, adds them together and then takes the square root of the product. Reason for this is that energy responds to the square of the voltage so if you square a large number vs a small number (voltage amplitude) you will have a much larger number but since it isn't continuous, it has to be combined with the other amplitudes.
At least that's the way I remember it and it has been awhile.
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Today's Featured Article - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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