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- From: DROEGE@fnald.fnal.gov
- Subject: Reply to Bruce Dunn
- Message-ID: <930107161130.20800508@FNALD.FNAL.GOV>
- Sender: scott@zorch.SF-Bay.ORG (Scott Hazen Mueller)
- Reply-To: DROEGE@fnald.fnal.gov
- Organization: Sci.physics.fusion/Mail Gateway
- Date: Thu, 7 Jan 1993 23:03:47 GMT
- Lines: 31
-
- Bruce Dunn wonders if my outside temperarute effect could be due to line
- voltage variations. Don't think so Bruce. There was a table in the early
- version of the Como paper that got cut out of the final version due to the
- space limitations. It listed some of the control measurements taken over
- a three day period of operation, I repeat some of them below:
-
- Variable Mean Sigma
- +5 Volt Reference 5.0008 .00022
- ADC Reference 4.5299 .000081
- +15 Supply 14.9590 .00072
- High Quality Ground 0.00049 .00012
- Cell Current -0.5557 .0011
- Current Sum 0.0017 .00068
-
- In general while running I watch 60 odd such variables. Any that look
- suspicious I can plot, and I store the last 3 1/2 hours so that the recent
- history of anything funny can be brought up. I usually plot about 10, which
- is about the limit of colors that can be distinguished.
-
- The ADC reference has been through three layers of regulator before it is
- used. The last two in a temperature controlled environment. So there are
- lots of checks. But never enough. The Mark II version suffered from some
- cleverness on my part that is too complicated to explain, but probably was the
- source of the reported heat pulses. This was partially fixed in the Mark II/
- V, and will be fully fixed in the Mark III.
-
- So this remains a tough business. Simple open cells, i.e. Mills, have large
- error bars. Complex designs like my kludge can have complex interactions and
- so tale long and careful study.
-
- Tom Droege
-