Arnaud had sent along some measurements on HAM1, trying to measure the transmissibility from the HAM1 stack to the RM suspensions. I ran these measurments this morning, during the maintenance period. It looks like the LLO and LHO RM damping designs might differ a bit, maybe the LLO damping filter is a bit more aggressive? First image is just the RM1 L plant measurement, it was taken with the RMs both in DAMPED (unaligned) and HEPI isolated (SC was off, but HAM1 uses high UGF, blended (L4C/IPS) loops). The second image is the HEPI X to RM1 L transfer function, which was taken with HEPI in READY and the RMs still DAMPED. Both templates are saved in the SVN in H1/ HAM1/Data/Transfer_Functions/Measurements/Undamped folder.

EDIT: LLO's measurements are the black refs, my measurements are the red. Arnaud reports that the difference is due to an old damp filter design on the RMs, LLO now matches us.