Reports until 15:35, Wednesday 09 April 2014
H1 SEI
hugh.radkins@LIGO.ORG - posted 15:35, Wednesday 09 April 2014 (11252)
WHAM4 HEPI Parker Valve

Just for the record, plots attached to show the problem we saw on the horizontal corner1 HEPI actuator.  The first and second plot shows the unmatched response slopes to the H1 drive.  The third plot shows an acceptable result although it might be nice to normalize/overlay the traces but we are also looking at the calculated slopes so we aren't just sticking a thumb up and seeing if it looks ok, but almost.  These acceptable slopes range from 1.75 to 2.00cts/ct.  The first plot H1 slope is low at 1.35 and the second is too high at 2.6cts/ct.  The PTB haven't given an explicit criteria, so, executive decision: if you have to look closely to see if the slopes are much different then they are ok.

Images attached to this report