[Dsg-halla_ecal] [Revised Logentry] ECal card showing regular oscillation between two values

[jonesdc at jlab.org]

Logentry Text:
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Just when we thought we had seen all failure modes, a new one shows up. Now the card that reads the heater thermocouples that are used to control zones 17-32 are showing a regular oscillation between two values around 15 degC apart 207 to 222 (see attached plot). This particular card seems to be failing more and more often. I suspect it will soon need to be replaced. I cycled the power to stop the oscillation. 

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