HV core (-160 V) now attached to bottom 3 FEEs (with grounded kapton)

DSSDs bias OK, leakages unchanged

No appreciable change in waveforms

Some estimates

aida01/aida05/aida09 VHF noise: 5 channels frequency = 10 MHz ?

All FEEs:
Oscillation at ~25-35 channels = 1.4 to 2 MHz ?
Varies a bit with each FEE.

No obvious issue with upper FEEs unsure why 10 MHz is present - fee09 has been replaced but showed it before as well.

Lower frequency noise on every FEE may be ground noise from e.g. switching PSU?

No more access to S4 to check thoroughly again.