What is the difference between Cross Power.vi, Cross Power Spectrum.vi, Auto Power Spectrum.vi, and Power Spectrum.vi?
Cross Power Spectrum.vi and Auto Power Spectrum.vi are high-level VI’s found in the Measurement subpalette. The others are lower-level. It’s usually best to stick with the high-level VI’s. The (Auto)Power Spectrum computes the power present in the signal, but you lose phase information. The Cross Power (Spectrum) computes the power present in both signals and also returns the phase difference between their spectrums.
