Auto Power Spectrum (Not in Base Package)

Computes the single-sided, scaled, auto power spectrum of a time-domain signal. Details

Signal is the input, time-domain signal, usually in volts. At least three cycles of the signal must be contained in the time-domain record for a valid estimate.
dt is the sample period of the time-domain signal, usually in seconds. dt is also where is the sampling frequency of the time-domain signal.
Power Spectrum is the single-sided power spectrum in volts rms squared if the input signal is in volts. If the input signal is not in volts, the results are in input signal units rms squared.
df is the line frequency interval of the power spectrum in Hertz, if dt is in seconds.

Auto Power Spectrum Details

This VI computes the power spectrum as

,

where N is the number of points in the signal array and * denotes complex conjugate. The VI then converts the power spectrum into a single-sided power spectrum result.