Auto Power Spectrum (Not in Base Package)
 |
Signal specifies the input time-domain signal, usually in volts. The time-domain record must contain at least three cycles of the signal for a valid estimate. |
 |
dt is the sample period of the time-domain signal, usually in seconds. dt is defined as 1/fs, where fs is the sampling frequency of the time-domain signal. |
 |
Power Spectrum returns the single-sided power spectrum. If the input Signal is in volts (V), Power Spectrum has units of volts-rms squared (Vrms2). If the input Signal is not in volts, Power Spectrum has units of the input signal unit-rms squared. |
 |
df is the frequency interval of the power spectrum in hertz, if dt is in seconds. |
Auto Power Spectrum Details
This VI computes the power spectrum using the following equation.
where n is the number of points in the Signal and * denotes the complex conjugate. This VI then converts the power spectrum into a single-sided power spectrum.
Example
Refer to the FFT and Power Spectrum Units VI in the labview\examples\measure\maxmpl.llb for an example of using the Auto Power Spectrum VI.