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Reports until 15:01, Tuesday 19 January 2016
H1 SEI
jim.warner@LIGO.ORG - posted 15:01, Tuesday 19 January 2016 (25028)
ETMX ISI T240's recentered

Hugh worked on a script looking at the ISI T240 centering in alog 24902. I noticed on that list that ETMX had one T240 that had all 3 legs mis-centered. Eager for any straw to grasp on the ETMX ISI ring up, I took a couple of minutes to recenter all of ETMX's  T240s. First I repeated Hugh's measurement, using his script from 24902, then I took the ISI down to Damped and opened all three of the T240 filter banks from the overview. I then clicked on FM6 (labeled AutoZ) on the first (X) bank for each T240 for several seconds. This triggers the T240's Auto-zero servo, which centers up the masses. I watched the readouts on the ISI overview and waited for them to settle down to below ~1000 counts, retook the centering measurement, then re-isolated the ISI. This fixed the centering of the out of range T240, according the to voltages Hugh's script read out.

My before measurement of the corner 2 T240 was:

ETMX T240 2 DOF X/U = -1.988 [V]
ETMX T240 2 DOF Y/V = -2.227 [V]
ETMX T240 2 DOF Z/W = -1.135 [V]

After, from Hugh's script is:

ETMX T240 2 DOF X/U = 0.084 [V]
ETMX T240 2 DOF Y/V = 0.065 [V]
ETMX T240 2 DOF Z/W = 0.097 [V]

Much better. It's entirely likely this doesn't matter that much, we'll have to wait and see. I've been watching ETMX all day and it hasn't really rung up, so far.

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