When looking at a receive path for an 9361 BIST tone in the IIO Osc's FFT plot, the BIST tone shows a dBFS of -1.76, yet the time domain shows a full-scale +/-2048 amplitude swing. Other input signals seem lower than expected as well.
For looking a sine waves this doesn't really make too much sense...
The offset is caused by an attempt to correct the power for the ENBW of the Hanning Window used.
Some interesting reading can be found here .
Yes you are correct. IIO plotting may be doing the scaling.
Moving to Linux sub space for more comments.
Retrieving data ...