This is a comparison between the ISS, ILS and PMC signals before (REF traces) and after the changes in the electroncis and the modulation depth, see 31095.

A few observations:

• The ILS HVMon signal is unchanged except above 5 kHz, where the new whitening makes a difference.
• The PMC HVMon signal now shows good coherence with ILS HVMon above 200 Hz.
  Even so there is a gain of 3 of additional loop gain at ~1.5 kHz and higher the peaks are higher than before.
  At frequencies above 1kHz the signal looks significantly better, maybe more than one would expect from the modulation depth change.
• The in-loop PDA signal from the first loop ISS looks the same.
• The out-of-loop PDB signal on the other hand now shows the same peaks as the ILS/PMC length signals—even so the overall noise level is lower.
• The feedback signal to the ISS AOM stayed very similar.
• There was coherence between the HPO power and PDB before, which is now gone.