Cross Power Spectrum (Not in Base Package)

Computes the single-sided, scaled, cross power spectrum of two real-time signals. Details  

	Signal X is the input, time-domain signal X, usually in volts. At least three cycles of the signal must be contained in the time-domain record for a valid estimate.
	Signal Y is the input, time-domain signal Y, 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 fs is the sampling frequency of the time-domain signal.
	Cross Power XY Spectrum Mag is the single-sided, cross power spectrum between signals X and Y in volts rms squared if the input signals are in volts. If the input signals are not in volts, the results are in input signal units rms squared.
	Cross Power XY Spectrum Phase is the phase spectrum in radians showing the difference between the phases of signal Y and signal X.
	df is the frequency interval of the power spectrum in hertz, if dt is in seconds.

Cross Power Spectrum Details

The cross power spectrum gives the product of the amplitude of the signals X and Y and the difference between their phases, phase of Y minus phase of X.

The Cross Power Spectrum VI computes the cross power spectrum as

where N is the number of points in array Signal X or Signal Y. The Cross Power Spectrum VI then converts the cross power spectrum to single-sided magnitude and phase spectra.