Auto Power Spectrum VI
Owning Palette: Spectral Analysis VIs
Requires: Full Development System
Computes the single-sided, scaled, auto power spectrum of a time-domain signal.
 Add to the block diagram |
 Find on the palette |
Owning Palette: Spectral Analysis VIs
Requires: Full Development System
Computes the single-sided, scaled, auto power spectrum of a time-domain signal.
| Add to the block diagram |
Find on the palette |
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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. |
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dt is the sample period of the time-domain signal, usually in seconds. Set dt to 1/fs, where fs is the sampling frequency of the time-domain signal. The default is 1. |
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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. |
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df is the frequency interval of the power spectrum in hertz, if dt is in seconds. |
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.
Output Units for FFT-Based VIs
Refer to the FFT and Power Spectrum Units VI in the labview\examples\Signal Processing\Transforms directory for an example of using the Auto Power Spectrum VI.
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