Hello everyone.
I have been programming a UI that uses FFT and that can modify its settings. I have adapted the controls and everything works. The problem is that, even with a good resolution and averaging, I have much more sidebands in the FFT calculated by LabVIEW than in the one that I have with an oscilloscope. Is there a way to remove these sidebands? No filtering or averaging has been done. Is that the reason?
I am sure that the measured signal should be a neat sine wave, so the multiple sidebands should not appear as high as they do. I put an example of the spectrum that I can obtain with a high resolution:
