Reports until 14:36, Monday 19 May 2014
H1 SUS
betsy.weaver@LIGO.ORG - posted 14:36, Monday 19 May 2014 - last comment - 12:32, Monday 01 November 2021(11970)
HAM 5 Status

Today, Jeff is on operator duty so I tagged back in on HAM 5.  While Jason was resettting his equipment, I worked on -

- cable routing for SR3, including switching the cables in the bracket since they were mounted backwards.

- positioning all of the lower stage AOSEMs on SR3.

- removing yaw adjustment hardware and torqued remaining dog clamps.

- cable routing on SRM.

- resetting the SRM open light gains/offsets with Arnaud (and creating the safe_snap once set) - Note, this was done because it was last done on a different set of electronics/cables.  Currently, all of the OSEMs are backed out and reading open light - I'll resume setting these tomorrow.

- staging the dog clamps for the upcoming OFI and 3-baffle installs on this table.

Comments related to this report
jeffrey.kissel@LIGO.ORG - 12:32, Monday 01 November 2021 (60477)
Link 

J. Kissel

In Nov 2021, looking at the OSEMINF OFFSETs reveals for the past 8 years reveals that SRM has had these same open light current values since this aLOG. 
I'm not sure where the values ended up recorded in terms of the E1200343 excel spreadsheet we used to keep up-to-date, so I report them here, attached to this aLOG for posterity.
The open light current values (OLC values, in terms of ADC counts) are based on the offsets and gains currently installed, where, as always, OLC [ct] / -2 = OFFSET [ct], and 30000 / OLC [ct] = GAIN, so I've derived the OLC value from the existing OFFSET value.

SRM OSEM       Open Light     OFFSET       NORMALIZING 
               Current [ct]   [ct]         GAIN [ct/ct]
   M1 T1       26908          -13454       1.1149
   M1 T2       25472          -12736       1.1778
   M1 T3       28670          -14335       1.0464
   M1 LF       27764          -13882       1.0805
   M1 RT       26272          -13136       1.1419
   M1 SD       25516          -12758       1.1757
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