Status of INGRID on the 26-April-2002 
=====================================


NOTE: this was an UES night after the last  warm up  of INGRID (in
----  which they put the old motors again). We took a few hours of the 
night from the observers to check the work done on INGRID.  After this 
night INGRID was moved to NASMYTH.  Therefore nobody  observed at Cass 
after this day.

*The rotator center of the telescope is  now at pixel (460,482), i.e.,
 aprox. 12" left and 7.2" down of the  center of the array, confirming
 that the translation of the detector was corrected.   (The sky PA was
 set to 180 deg when this test was done)

*A change of +0.1mm in telescope focus corresponds to ~+220 microns in
 the INGRID focus.

*The readout noise of  the detector is a bit  higher than before (~7.2
 ADU compared to ~4.5ADU before).

*The  number of hot pixels  is aprox. the  same (~0.20%  of the total)
 than in the  previous  cold down.  Measured  in  a dark frame  of ~2s
 integration time.

*With  the PI in  the beam and  the cass-k pupil   stops, I measured a
 misalignment in the vertical direction of ~800-1000 microns.

 I could not measure it for other pstops because I did not have access
 to the instrument to allow for UES setup. I measured the misalignment
 of ALL the  pupil stops the  following day (26-April-2002).  The info
 obtained is in another document.

*There was a misalignment also in the direction of the movement of the
 pstop wheel  (for the cass-k  stop),  which seemed  to  be due  to  a
 software problem. We compensated for  that by moving the pstop  wheel
 by  -1deg    (See   the    measurements done   the     following  day
 (26-April-2002).

*The  array  is rotated by   0.84+/-0.06deg  (measured by  making  the
 astrometry on an  image of M67;   16 stars were  used).  The position
 angle of  the line joining each pair  of stars is always greater than
 the real position angle obtained  with the coordinates of the  stars.
 Taking into account that the UltraDas software  inverts the image, it
 is obtained that we should rotate the  detector clock-wise to get the
 right orientation.

*For INGRID focus  -1200microns and telescope  focus 98.30mm the plate
 scale was measured to be 0.245"/pix.

*I did not have really any time to do tests on the mechanisms.

*A few faults/notes:

 -the  command 'datum  ingrid pstop'  does not  work (was  the command
  disabled? I really do not remember!)
 
 -the   RTD  stopped several  times  displaying  images, though it was
  showing  'scanning' and 'data   detection on'.  This  happened while
  taking 1s exposures  with  a 'multrun ingrid  100  1'.  To  fix  the
  problem  it was necessary to  type 'startobssys'.  I do not remember
  having this problem  before, although I have  used this command with
  the same exposure time many times.

 -The    script 'ifocusrun' was   not   working. The  command was  not
  recognized.

 -The ingrid   internal    focus    does not  accept    values    like
  e.g. -534. 'ifocus ingrid -534' gives  an error message and an alarm
  appears, but  'ifocus ingrid -530' is fine.  I know  the accuracy is
  not that high, but could the software be modified  so that it rounds
  the values?