MDM Trouble Report for 2015 Sep 05

Telescope: 2.4m
Observer(s): R. M. Wagner (OSU)
Instrument: OSMOS

Problem(s) Encountered:
Three problems tonight.  We continue to have problems with the disperser 
indexing with OSMOS.  It behaved the same way Stephan described earlier in
the day.  Nothing would reset it.  When I got here it thought it was in position 1,
the blue VPH.  I took a spectrum with a slit in and found that this could not be
correct.  It had to be an open position.  So I guessed first that it was position 2
and commanded >disper reset 2 .  After that it seemed to work find between 
positions 1 and 2.  But once I went to position 3 it failed again.  Toggling between
positions 1 and 2 works ok so far.  I fixed my acquisition script to assume the
open position is slot 2.

The 2nd problem is that the x and y guider stages do not move.  Commanding
the unit to go to the field center resulted in an immediate reset to 0 0.  Putting
in a x position like 7000 in the x field did exactly the same thing.  I looked at the
telescope and the documentation but could not find a smoking gun as to the
possible cause that could allow me to continue.  This effectively closed me 
down.

The third problem is that the telescope collimation is still not optimal.  In pupil
images obtained at the beginning of the night, the secondary is noticeably 
offset from the center of the image.  We might be able to re-center it with 
iterative direct images but I would probably need help up here with the cell 
adjustments.


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Submitted on 2015 Sep 6 [1:19:16]