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RMS

Discussion in 'Wiki' started by derekleffew, Nov 28, 2008.

  1. derekleffew

    derekleffew Resident Curmudgeon Senior Team Premium Member

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    Root Mean Square. A method of averaging, most often used in the theatre when discussing DMMs in measuring voltage and current. See Learn Root Mean Square(RMS)/Quadratic Mean(QM) tutorial, definition, example, formula.

    RMS is most applicable when describing or measuring the power contained in an AC waveform that is not a pure sine wave. A common place in the theatre where this occurs is on the output of a phase-control dimmer. Likewise, the current drawn by a phase-control dimmer is non-sinusoidal, or nonlinear. A true-RMS meter must be used for accurately measuring both voltage and current on a phase-control dimmer.

    "Crest factor" is a measure of just how non-sinusoidal a particular waveform is.

     
    Last edited by a moderator: Nov 28, 2008

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