Not sure if that's really required, since cross alignment is, first, used to identify time/phase differences between signal, isn't it ?
You may just change the ADC scale.
I'm using 10V as a target for Scaler, personnaly.
Hello Rja4000
As promised I tried to go to
10V on the ADC.
If the D50III is in 5V position and
the output is at 0 dB I can only work
at 50% of a full bit signal on the ADC, the 2nd gain
of the scaler is 7db.
With this level I cannot with a correlation
of 1000 reduce the noise sufficiently, and in addition the noise
of the ADC at 10v is a little higher than at 4.5v.
I arrived at -116.2 dBFSA without correlation
and at -124.4dBFSA with correlation.
The calculated noise of the signal being -134.5 dBFSA.
I tried to push the Nb of correlation with overlap to 8000
but it is still not enough, the noise of the signal with this input level
must be even lower.
So in these conditions I arrive at the limit of the possibilities
of the correlation in these conditions.
I went back to 4.5 and I saw that at -0.5db on the D50III
I did not saturate.
the measurement in this condition gives -126.62 dBFSA for the THD+N