FFT Spectrum (Mag-Phase) unit

[Massif]

  Hi,

I used the VI  "FFT Spectrum (Mag-Phase) " for 1 Chanfor 1 channel with input data in V.

The magnitude seems to be in volts-rms (V_rms).

Is it possible to have the result of the magnitude in V?

I have seen different topics about that, but no clearly reponse.

  Regards

  Julien

link to LabVIEW help

https://www.ni.com/docs/en-US/bundle/labview-api-ref/page/vi-lib/measure/maspectr-llb/fft-spectrum-m... 

[K_Bull]

Hi Massif,

Please Read the following KB - What is the definition of root mean square (RMS) voltage? [link removed; article no longer available]

Here it mentions how you can convert the Vrms value to a V peak value.

I have attached a small VI which you can use to do this conversion.

Enjoy.

Message Edited by Kabul on 06-10-2008 01:09 PM

[Massif]

   Dear Kabul,

Thank you for your answer.

I understand all now.