RMS Value for non periodic signals

[MichaGue_01]

Hello,

to calculate the RMS value of periodic signals there is the VI "NI_MAPro.lvlib:Averaged DC-RMS.vi" available. Is there also a vi to calculate the RMS for non periodic signals?

Thanks a lot and best regards,

Michael

[JoeWork]

Can you provide a file with an example of your file?

[MichaGue_01]

You will find the VI "NI_MAPro.lvlib:Averaged DC-RMS.vi" by right clicking in the block diagramm "Signalverlauf -> Analoger Signalverlauf -> Signalverlaufsmessungen -> Mittelwert und RMS".

But I think my statement above is wrong. Inside the "NI_MAPro.lvlib:Averaged DC-RMS.vi" for RMS values the VI "RMS.vi" is used. The helpfile tells, the following formula:

Because it uses sampled data it calculates an approximation of RMS which should work for periodic and non periodic signals. Am I rigth?

Best regards,

Michael

[GerdW]

Hi Michael,

RMS = root mean square - and that's what is calculated according to the formula in your last post.

What's the difference for periodic and non-periodic signals? There is none: you just calculate the RMS of the samples in your array/waveform…