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Cryo Lab eLog |
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Tue Jun 22 14:35:40 2021, aaron, shruti, DailyProgress, Control System, slow temperature control 7x
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Wed Jun 23 17:53:21 2021, aaron, DailyProgress, Control System, slow temperature control
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Thu Jun 24 12:26:56 2021, shruti, DailyProgress, Control System, slow temperature control
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Thu Jun 24 14:37:12 2021, aaron, DailyProgress, Control System, slow temperature control, more transfer functions
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Mon Jun 28 10:12:28 2021, shruti, DailyProgress, Control System, glitches, transfer function   
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Mon Jun 28 13:16:07 2021, aaron, DailyProgress, Control System, glitches
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Tue Jun 29 08:53:02 2021, Chris, HowTo, Control System, acquiring slow channels
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Message ID: 2766
Entry time: Mon Jun 28 10:12:28 2021
In reply to: 2765
Reply to this: 2767
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Author: |
shruti |
Type: |
DailyProgress |
Category: |
Control System |
Subject: |
glitches, transfer function |
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The glitches seem to come from the slow controls output and temporarily result in an actuation voltage of +-10 V even when the limit for that channel was set to +-2 V in the PID script. This triggers the 'WIN' light and a beep from the ITC 502 while also losing the lock.
Aaron and I also had observed this last week.
[shruti, chris]
We were able to measure the loop transfer functions with the latest settings of KI=0.5 and PDH_CTL offset=2000cts on the slow control without being affected by the glitches too much. Chris also set up all the slow control channels so that they can be viewed with ndscope. In this we could also see that the transmission monitor sometimes glitched but the loop remained locked.
Attachment 2:
Updated measurement similar to elog 2759 |
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Attachment 4: |
Data.zip
7.726 MB
Uploaded Tue Jun 29 11:10:33 2021
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