Does the Extract Single Tone Information.vi only find the fundamental harmonic?

[solitude]

I capture a waveform that only has 1 frequency.  If I use the Extract Single Tone Information.vi to extract a single tone, is this single tone the fundamental harmonic?  And if I feed the residual portion of the waveform into the Extract Single Tone Information.vi, will the next tone be the second harmonic?  And so on?  Is it possible to compute the total harmonic distortion just by feeding the the waveform into the Extract Single Tone Information.vi over and over again (only feed the residual waveform into the vi continously)?

Message Edited by solitude on 08-18-2005 09:28 AM

[tbob]

Notice the title of the vi:  Extract SINGLE Tone.  It is expecting only one frequency.  This vi is not intended to handle a carrier frequency or audio with harmonics.  You say that you capture a waveform that has 1 frequency.  If this is so, then there should be no harmonics.  To measure harmonic frequencies, you must perform spectral analysis.  To measure total harmonic distortion, there exists a THD vi in the Waveform Analysis palette.