After I got the sinewave signal (12Hz), I used the Scaledwindow, AutoPowerSpectrum, and HarmonicAnalyzer to find the THD. I expect ed the harmonic frequency from HarmonicAnalyzer return as 12,24,36,48. But most of the time the harmanic frequencies are not what I expected. Examples: 12,21,37,51. Please help me how to get the amplitudes on the exact harmonic frequencies out from the fundamental. Thanks.
