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Entry  Thu Aug 8 12:01:12 2019, gautam, Update, IOO, MC1 suspension oddness MC1_suspension.pngMC1_suspension.pdf
    Reply  Mon Aug 12 19:58:23 2019, gautam, Update, IOO, MC1 suspension oddness 
Message ID: 14836     Entry time: Thu Aug 8 12:01:12 2019     Reply to this: 14842
Author: gautam 
Type: Update 
Category: IOO 
Subject: MC1 suspension oddness 

At ~1am PDT today, all the MC1 shadow sensor readbacks (fast CDS channels and Slow Acromag channels, latter not shown here) went to negative values. Of course a negative value makes no sense. After ~3 hours, they came back to positive values again. But since then, the shadow sensor RMS noise has been significantly higher in the >20 Hz band, and there are frequent glitches which kick the suspension. The IMC has been having trouble staying locked. I claim that this has to do with the Satellite box.

No action being taken now while I work on the ALS. In the past the problem has fixed itself.

Attachment 1: MC1_suspension.png  135 kB  Uploaded Thu Aug 8 13:03:18 2019  | Hide | Hide all
Attachment 2: MC1_suspension.pdf  34 kB  Uploaded Thu Aug 8 13:08:51 2019  | Hide | Hide all
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