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Re: RMS calculation

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Sorry for using this thread as i cant find way to post new problem.

How amplitude and level measurement VI calculates RMS calue for multitone signal. For single tone, Vrms= Vpeak/sqrt(2) gives same result but for multitone signal, result doesnt match with "amplitude and level measurement VI" calculated RMS. I need formula to calculate RMS value of multitone signal for PAPR calculations. i need formula of RMS for multitone to implement PAPR calculation in Hardware. 

Attached code shows calculation of PAPR by using different RMS values. Only Labview RMS calculation gives correct results as comapare to "Vrms= Vpeak/sqrt(2)".  

 

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Solution
Accepted by crossrulz

RMS = SQRT(SUM(X^2)/sizeof(X))

 

If just turns out that for a full cycle of a sine wave, the RMS turns into Vpeak/sqrt(2).  For anything else, you need to go through the full definition of RMS to calculate it.


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