Reports until 13:32, Tuesday 08 March 2022
H1 SUS (SUS)
rahul.kumar@LIGO.ORG - posted 13:32, Tuesday 08 March 2022 - last comment - 15:33, Tuesday 08 March 2022(62107)
ISC Satellite Amplifiers - transimpedance resistor values changed from 150k ohm (incorrect) to 121k ohm (correct)

Marc, Fil, Daniel, Rahul

This morning Marc and I went into the LVEA and pulled out the Sat amps which had incorrect 150 kOhm resistors (as identified by Fil and Marc last week). The affected suspensions were ZM4-5-6, OMC, OFI, OM1-3 and RM1-2 (TJ took them to SAFE state). Next, in the EE lab Marc replaced the 150 kOhm resistor with 121 kOhm resistor. We then went back to the LVEA and installed the Sat amps back into their respective racks. Given below are the s/n of the Sat amps on which we worked on - S1106060, S1106064, S1200942, S1200943, S1200171.

I will update the offsets and gains on the input osem filters for all of these suspensions after estimating the OLC (basically reducing it by 20% approximately).

Comments related to this report
rahul.kumar@LIGO.ORG - 15:33, Tuesday 08 March 2022 (62112)

Given below are the new offsets and gain, which I have accepted on the SDF as well,

sus osem OLC (121k Ohm) offsets (-OLC/2) gain (30000/olc)
OM1 UL 24394.608 -12197.304 1.2298
  LL 17747.4 -8873.7 1.6904
  UR 25814.4 -12907.2 1.1621
  LR 19602.81 -9801.405 1.5304
OM2 UL 17747.4 -8873.7 1.6904
  LL 18554.1 -9277.05 1.6169
  UR 25007.7 -12503.85 1.1996
  LR 25814.4 -12907.2 1.1621
OM3 UL 25814.4 -12907.2 1.1621
  LL 22587.6 -11293.8 1.3282
  UR 25814.4 -12907.2 1.1621
  LR 18554.1 -9277.05 1.6169
OMC T1 16939.0866 -8469.5433 1.7711
  T2 17098.8132 -8549.4066 1.7545
  T3 19054.254 -9527.127 1.5745
  LF 18337.9044 -9168.9522 1.6360
  RT 17524.7508 -8762.3754 1.7119
  SD 17902.2864 -8951.1432 1.6758
ZM6 UL 25249.71 -12624.855 1.1881
  LL 26432.3322 -13216.1661 1.1350
  UR 26432.3322 -13216.1661 1.1350
  LR 23555.64 -11777.82 1.2736
ZM4 UL 22740.873 -11370.4365 1.3192
  LL 28865.3394 -14432.6697 1.0393
  UR 27648.8358 -13824.4179 1.0850
  LR 28600.7418 -14300.3709 1.0489
ZM5 UL 28865.3394 -14432.6697 1.0393
  LL 28878.2466 -14439.1233 1.0388
  UR 27080.919 -13540.4595 1.1078
  LR 28904.061 -14452.0305 1.0379
OFI LF 23784.7428 -11892.3714 1.2613
  RT 18981.651 -9490.8255 1.5805
  SD 20598.2778 -10299.1389 1.4564
RM1 UL -24846.36 12423.18 1.2074
  LL -28879.86 14439.93 1.0388
  UR -16134 8067 1.8594
  LR -22587.6 11293.8 1.3282
RM2 UL -23555.64 11777.82 1.2736
  LL -31299.96 15649.98 0.9585
  UR -27105.12 13552.56 1.1068
  LR -28234.5 14117.25 1.0625