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If the harmonic signals go down when you increase the input attenuation, does this not mean that those signals were present at the input? In the video, you conclude that the harmonics are internally generated, even though they decrease with an increase in input attenuation.

The tinySA compensates when you increase attenuation so the measured level stays the same.
You can see this happen at the fundamental under marker 1.
The level of marker 1 does not change when you increase the attenuation

Thank you, Erik. Lots to learn!