Problem Fourier's transphorm result

1

I want to plot in the scope the FFT of my sinus signal with perturbations at 50KHz. In comparison with a perfect sinus at 50Hz, the Plecs result is identical whereas I should have one harmonics at 50kHz. How can I solve it?

2

Hello,

This is probably because of your FFT settings. If you set the base frequency (f) as 50 Hz, then to see a harmonic at 50 kHz, you need to set the number of Fourier coefficients (N) to at least a 1000 or higher. Please see the attached example.

Regards,
Manu

FFT.plecs (5.77 KB)

3

Thanks for your answer, my setting was ok. It was coming from my input signal. The command were wrong and my FFT was correct. Sorry