betsy.weaver@LIGO.ORG - posted 13:52, Friday 20 November 2015 - last comment - 13:47, Saturday 21 November 2015(23601)
VCO channel flipped once 10 days ago - does this mean anything to anyone?
While trying to understand and deal with the Beckhoff SDF diffs in OBSERVE mode, I stumbled on a weird channel that toggled states around 4pm local last Wed Nov 11 (01 UTC WED 11th). (Note, this occured well before the windy troublesome locking period when we saw a power glitch on Tuesd Wed 17th.) If the VCO Frequency Servo is set to "Int" (see the center of the medm pic attached below), do we care what this EXTFREQUENCYOFFSET channel is doing? And where is the medm for this EXTFREQUENCYOFFSET channel anyways? - Even with commissioners, we couldn't immediately find it... And, and, what's with the glitch in the middle of the 20 day trend on Wed 11th?
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Not sure but it might be related to this entry. https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=23293 Perhaps the wrong button was pushed? Or if there were problems encountered re-locking the input modecleaner after installation of the 45 MHz RFAM hardware, this may have been flipped to see if the input modecleaner would lock.