Recent content by tombo56

Thank you very much. How will that fix influence calculated distortion? I just wonder in which case calculated distortion was correct.

There is possible interaction between external generator jitter and REW algorithms. If using internal REW generator, there is as well some carrier jumping if option “Lock frequency to RTA FFT” is not being used. However, using “Show phase of harmonics” immediately makes carrier stable in RTA.

Source is Victor’s oscillator which is very stable and low distortion source. Observed behavior is present with both ADC’s I have, Focusrite Solo 3rd gen. and Cosmos ADC. It is enough to tick “Show phase of harmonics” and distortion numbers will go up by some 6 dB in most cases. Example...

There is, what seems to me, an error with coherent averaging. I first noticed that with certain sampling rate and FFT length ratios, when coherent averaging is turned on, measured signal and harmonics would start to jump down and up by several dB and up to 10 dB or more in some combinations. As...