I'm not confident in the explanation in English, but I'll try it anyway.
The D90SE is in DAC mode from start to finish.
Only the graph of D90SE alone is an automatic sweep of 80 points. The AP's digital generator output level is variable.
When measuring D90SE + MONITOR1, D90SE + Volume2 and D90SE + Pre90, the AP digital generator output level is always 0dBFS. I turned each volume knob to attenuate in the analog range.
From here, we will return to the Stone Age.
To change the measurement level, turn the volume knob while staring at the dBrA meter on the dashboard. The pot is difficult.
I want to record the values for the plot, but I can't follow the THD+N meter with my eyes, so I'll take a screenshot. Rewrite the file name to the model and dBrA value for later identification.
View attachment 213937
Open the screenshot image from the edge and make the dashboard meter value text.
View attachment 213938
Change them into a form that can be read by the AP, and import them into the graph of the D90SE alone that was first automatically swept.
There is still some work to be done, but the above is a rough procedure.
I was a primitive man.
It took more than an hour from the first automatic sweep to the completion of the posted graph image.
I do not recommend it to others. Choose a more efficient method.
edit
Now I noticed the button.
The CSV file is generated the first time, and the meter values are added to the same file from the second time onward...
View attachment 213939