camilla.compton@LIGO.ORG - posted 12:59, Monday 06 May 2024 - last comment - 13:35, Monday 06 May 2024(77652)
H1:ETMY_L3_LOCK_BIAS_OFFSET was at -7.5, nominal -3.
To get back into Observing, Jenne and Sheila reverted H1:ETMY_L3_LOCK_BIAS_OFFSET (with a 120s ramptime) from -7.5 to it's usual observing value of -3.0.
lscparams.py has been changed from -3.0 to -7.5. Maybe this is the 200V change Robert puts in 77633 but it looks like it's either been 320V or 115V recently, plot attached.
From 'svn diff /opt/rtcds/userapps/release/isc/h1/guardian/lscparams.py':
-ETMY_GND_MIN_BIAS = -3.0 # should be + 115V alog 67075, bias set to minimize coupling of noise on ground to DARM.
+ETMY_GND_MIN_BIAS = -7.5 # should be + 115V alog 67075, bias set to minimize coupling of noise on ground to DARM.
+ETMY_GND_MIN_BIAS = -7.5 # should be + 115V alog 67075, bias set to minimize coupling of noise on ground to DARM.
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This was my typo from last week, which didn't show up until today because the guardian was never loaded. It should be correct now: 77656