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VRMS - calcul

Submitted by bovn on Mon, 26/10/2015 - 08:26

Hello,
I would like to know how the VRMS is calculated as it is always in [257-260] volts.
With what information the software calculated the VRMS?

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Robert Wall's picture

Re: VRMS - calcul

Submitted by Robert Wall on Mon, 26/10/2015 - 11:05.

You need to look at the source files for emonLib, which you can get from Github. If you need a written explanation, try Building Blocks or Wikipedia.

The calculation is very simple, from Building Blocks:
"An RMS value is defined as the square root of the mean value of the squares of the instantaneous values of a periodically varying quantity, averaged over one complete cycle."
emonLib does that over many cycles in order to produce a better average.

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