I compared the results of the swept sine acoustic injection tests at the REFL area, performed on May 2 and 16.  (Note that I have not checked the calibration consistency between these days.)
The first figure is the 0-1000 Hz range and the others are their zooming up.

• 150 counts (blue) vs. 200 counts (orange) of the DAC output, 50-900 Hz scan with 5 Hz steps
  • The blue and the orange are almost similar for all frequencies.
• Around 120 Hz, 220 Hz, and 340 Hz: The current sensitivity looks to be occupied by this acoustic noise.