MDM Trouble Report for 2007 Jun 20

Telescope: 2.4m
Observer(s): John Thorstensen (Dartmouth)
Instrument: echelle CCD direct + 2 in FW

Problem(s) Encountered:
Three minor glitches, none of which cost any time:

1) During the afternoon something caused the mirror A/C breaker 
to trip.  There was a large anomaly in the A/C temperature curve
that lasted a couple hours, the problem occurred after that (there
was also some kind of power glitch, the microwave oven clock was 
blinking).  I caught the problem around 4 PM and reset the 
breaker, so the mirror was below ambient all night anyway.

2) After filling the dewar in the evening around 7 PM, I thought
to check the temp with the ut command in ccdcom and found that it
was around -94 C, but the set temp is -100.  At first I thought 
I must have let the dewar warm up -- it had been about 15 hrs
since I filled it, the days are so long now -- but that's 
never happened with this dewar before, and the temperature 
stayed a few degrees above the set point all night.  I wonder
if the very warm ambient T is causing too much heat to leak 
into the dewar?  In any case, no time was lost.  Unless the 
staff feels that the dewar needs to be taken off and checked 
immediately, I'll ask that it stay put, so that my flatfields
etc do not need to be repeated.

3) The dome did not return to the home position at the end -- 
it was somewhat less than 2 feet out (it read 322.4 when 
manually returned to the contacts).

------------------------------

Submitted on 2007 Jun 21 [5:38:33]