harmonics analyze

[yogui]

I'm sorry, but I really don't arrive to do it.

Must I use the analyzer_hamonics_distorsion.vi to do this ?

I'm lost a little.

Thank you

[yogui]

Just a little precision.

I have a signal with fundamental frequency. And I would like to know the exactly frequency of an harmonic.

For example, the fundamental frequency is 60 Hz. I know the harmonic that I sook is between 100 et 105 Hz. And I want to know the exactly frequency. I would, thanks to a VI, to have a output with this value.

Thank you

[Dr._Imad]

As I said, the harmonic analyzer vi does that.  The outputs are the fundamnetal frequency and the signal levels at the different harmonics.  The frequencies of the harmonics are not given because it is assumed and is a known fact that they are a multiple of the fundamental harmonic.

if the Fundamental freq= F

then the harmonic frequencies are kF, where k=2,3,4...

[yogui]

Yes, I was badly explained. I don't want the harmonics kF but a particularlly harmonic frequency. It's my problem, so I can't use kF. I only say that my harmonic frequency is located entre 2 frequencies ; I know just the small interval where will be located harmonic frequency but not the exact frequency.

[tbob]

What Dr. Imad is trying to say is that if your fundamental frequency is 60Hz, your harmonics will be 120Hz, 180Hz, 240Hz, etc.   Just multiply the fundamental by 2 to get the second harmonic (2*60=120), multiply by 3 to get the third harmonic, and so on.  This is the basic definition of the harmonic.  If your fundamental is 60Hz, your 2nd harmonic will not be between 100 and 105 like you mentioned, this is not physically possible.  If you are seeing a harmonic between 100 and 105, then either your fundamental is between 50 and 52.5, or you are seeing something other than a harmonic, like some intermodulation frequency resulting from the mixing of two frequencies.