mark.barton@LIGO.ORG - posted 10:42, Friday 11 January 2013 - last comment - 11:16, Friday 11 January 2013(5077)
ITMy OL values
Mark B and Betsy.
The values being returned from the L2 AOSEMs were a bit odd, so Betsy and Travis investigated. It was decided to replace the LL OSEM which had been reading only some 14K counts. Old SN was 443, new is 491.
We also concluded that the gains and offsets in the L2 OSEMINF block weren't up to date, because even with the AOSEMs backed out to the OL condition, the UL, UR and LR _OUT values weren't +15000. So we remeasured the OLs and recalculated the gains and offsets:
prettyOSEMgains(logOLs('H1','ITMY'),'ITMY')
...
L2UL 25076 1.196 -12538
L2LL 22916 1.309 -11458
L2UR 17540 1.710 -8770
L2LR 18608 1.612 -9304
Betsy entered these and as hoped all four _OUT values were then very close to 15000.
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