MDM Trouble Report for 2011 Feb 20

Telescope: 2.4m
Observer(s): Brendan Miller (University of Michigan)
Instrument: CCDS

Problem(s) Encountered:
A/C display showed periodic spikes in temperature readings that were clearly inaccurate (e.g., saying dome went from 0 to 20C almost immediately).
Briefly gave message (before returning to normal): system disabled, sensors appear to be malfunctioning.
Seemed to maintain correct control (ie, cooling appropriately, mirror kept above dewpoint) so treated as software/sensor glitch. 
Monitored situation but it did not appear that any direct action or intervention was necessary or would be helpful. 

Conditions during night were fairly cold (to -3C outside) with extremely high humidity (100% to 90% over course of night). 
Only somewhat less extreme within dome. Dome was shut all evening. There was some snow in afternoon/early evening, and rain earlier. 


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Submitted on 2011 Feb 21 [6:04:28]