40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  PSL  Not logged in ELOG logo
Entry  Thu Mar 19 15:34:41 2020, anchal, DailyProgress, North Cavity, North path's buggy nature solved IMG_20200319_154013.jpg
    Reply  Sun Mar 22 17:23:29 2020, anchal, DailyProgress, North Cavity, North path's buggy nature NOT solved 
       Reply  Wed Mar 25 15:50:57 2020, anchal, DailyProgress, North Cavity, North path's buggy nature NOT solved Screen_Shot_2020-03-25_at_3.48.24_PM.png
          Reply  Tue Apr 14 12:24:16 2020, anchal, DailyProgress, North Cavity, North path's buggy nature Strikes Again! NorthPathWentBuggy.pdf
             Reply  Thu Apr 16 18:08:56 2020, anchal, DailyProgress, North Cavity, North path stopped being buggy NorthPathStoppedBeingBuggy.pdf
Message ID: 2563     Entry time: Thu Mar 19 15:34:41 2020     Reply to this: 2564
Author: anchal 
Type: DailyProgress 
Category: North Cavity 
Subject: North path's buggy nature solved 

I found out that since the slow PID of the FSS used Cavity reflection DC level, it is important that this path remains rigid and undisturbed from any testing. In CTN:2559, when Shruti and I were realigning North PMC, we used  BNC-T (which was permanently attached to the rack) to pick-off North cavity reflection DC signal. During this putting on and off the cable, we made the BNC-T itself loose and the connection to acromag card became buggy.

I have fixed this by connecting the acromag cards directly to the cable coming from the table behind the rack. Now connections/disconnections at the front of the rack shouldn't disturb this vital connection. Still, we need to be careful about this from next time. I had no idea what went wrong and was about to start a full-scale investigation into PMC and FSS loops. Thankfully, I figured out this problem before that.

 

Attachment 1: IMG_20200319_154013.jpg  4.189 MB  Uploaded Thu Mar 19 16:45:38 2020  | Hide | Hide all
IMG_20200319_154013.jpg
ELOG V3.1.3-