Daniel, Camilla
Following on from Ryan's 71420, we looked at the movement of ITMY (only has ASC control) during DHARD_WFS and see there is now larger spikes during locking than before 29th, see attached plot where H1:SUS-ITMY_L2_OSEMINF_{U,L}{L,R}_INMON spikes during locking are larger after the t-cursor (see bottom purple plot for when violins rang up).
Zooming in, attached plot, we can see when the Input to the DHARD_Y filter is turned on that the output to DHARD_Y filter has a large transient lasting ~1second, not seen in DHARD_Y inmon. The only filter that is on during that time FM6 and although it has a larger step response, there is a 5s TRAMP so Daniel doesn't see an issue with this.
Nothing obvious happened to DHARD on the 29th, only alog around that date shows a change that was reverted 70928.
During relock on Tuesday we plan to increase this DHARD_Y ramp time (currently 5s) to see if we can reduce this transient that appears to have increased by a factor of 10 around June 29th. See attached plots of relock before and after the violins rang up.
There were some SDF Diffs (71670) for H1:ASC-DHARD_Y_TRAMP and H1:ASC-DHARD_P_TRAMP that I accepted, which bumped the ramp times up to 15 seconds.
