From: Frank Geurts (geurts_at_rice.edu)
Date: Wed Mar 05 2003 - 12:01:51 EST
hi Steve,
the stability of TOFp's HV has been a pain from day 1. That's why I
suggested in the working document for TOF-slowcontrols to keep any TOFp
HV monitoring completely out of the regular red/yellow alarms. We know
about the channels and the way the read-out can act up. The monitoring
of TOFp's HV through SC is very helpful in providing a nicely structured
and archived reference but shouldn't be used to set alarms.
Btw. you're right about the 2000+ voltages ... in my local monitoring
software i can tell from the bit patterns that those are bad readouts.
And, yes ... since this is a readout issue over a shared bus you will
see this behaviour show up semi-randomly throughout the set of HV cells.
Now, what was that backdoor again :) ....
gronstal_at_creighton.edu wrote:
> I have a question for ya. So far I have all your parameters being
> recorded on the slow controls archiver. I haven't had a chance to edit
> the web page to give you easy access to the data. I can show you a back
> door method to get to it though. My main concern before alarming the
> alarm handler of errors is that the TOFp hv's voltage read is often
> fluctuating all the way up to 2000+ V. Since this is a ?false reading? it
> would sound an alarm just about every time it read the file (every 10
> minutes). I was wondering if there is a max value, such that anytime I
> get a value above this, I can just disable the alarm. The other option is
> to use the config screen to take the channel completely out, but it
> appears to be on many channels that rotate. What do you think?
>
> steve
>
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