Vertical Scale for FFT

[cju]

If I am using Transforms.PowerSpectrum to convert an array of Volts, how do I know the vertical scale of the return array? It should also be in volts but I am not sure what voltage values the return array relates to.

I understand it is supposed to be the amplitude at a certain frequency, but I should be able to relate that to a specific voltage.

[Santiago D]

The Power Spectrum function is used to determine the frequency and its respective amplitude of a signal.  The vertical scale (y-axis) of the output array contains the values of the signal's amplitude .  Therefore, if you acquire a sign wave that ascilates between -5V and 5V you will receive a value of 5.  The unit for the amplitude will be in the same unit as the signal coming in, in this case, Volts.  The horizontal scale (x-axis) of the output array describes the signal's frequency in Hertz.

Santiago D.