bennog wrote:Look at the 100kHz square with a sample rate of 199 and 496 kS/sec
And you will see why the fft is showing the data you posted.
That it works at 500 kS/sec is because the source clock of the generator is the same as the clock source of the scope.
If you had used a external function generator you would get the same odd fft's.
Try making the FFT with 1GS/sec then all works ok.
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