I measured the OMC DCPD dark noise.

It is basically the same as the one measured in March (fig. 1).

There is an extra peak around 8Hz, which was not present in the reference (March 5 2024).
Except for the peak the spectra are the same.

However, sometimes, the noise get worse 70-80Hz as shown in fig.2 and fig.3.

This bump appears only briefly and sporadically. I had to take many (20?) measurements to catch this bump.