Noticed in this post that attenuation issue is fixed in next release: Changing RMS Voltage when changing attenuation
Changed to version 1.201 and firmware was upgraded to version 60.
Item 1:
seems not solved: At -21dBVS I expected still to get 1V rms on output after amp (21dBV gain). However I still get 1.4V (3dB off).
Item 2:
is now closed: Now in FFT the input attenuator scaling is compensated with v 1.201
New issues: in the Automated tests:
3: AMP-freq-response Chirp: does not report strange result, output signal is seen on scope of QA40x v1.201, but does not look like normal….
4A: AMP-Gain-and-Distortion versus Amplitude gets stuck in 0dB input attenuation when Autoset Input Range is enabled. Is logical, but should be fool-safe: can easily be solved in software by ignoring this function when the I2S source is selected,
4B: AMP-Gain-and-Distortion versus Amplitude; first measurement point (-40dBV input) gives a wrong gain 36dB, 2nd point is 24dB (should be 21dBV actually). When starting at a lower input level (-46dBV input) it goes ok
Will test more in the coming days.