chandra.romel@LIGO.ORG - posted 17:44, Tuesday 16 May 2017 - last comment - 18:21, Sunday 21 May 2017(36227)
X&Y beam manifold pressures
Interesting pressure trends on X & Y beam manifolds. See my previous aLOG about rate of rise test followed by pumping on just turbos (IPs valved out). PT180 (y-arm) trend has shifted and headed up! Does this mean the fault is in IP6 and not a leak?
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Valving in IPs and valving out turbos for the night.
Also interesting is how PT170 steps "up" its reading when reacting to the, as yet unkown internal, gauge "step" change (voltage change?) while PT180 steps "down" when this unknown internal gauge change happens. I wonder if the electronics use varying voltages for various pressure ranges etc?
Those steps that I think you are referring to are me hard closing GV 5,7.