From relder@space.mit.edu Tue Jan  7 13:14:17 1997
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Date: Tue, 07 Jan 97 13:13:58 EST
From: relder@space.mit.edu (Dick Elder)
To: dd@space.mit.edu
Subject: Dim gratings
Cc: mm@space.mit.edu
Status: R

Listed below are the dimmest of the gratings.  (The detector bias voltages 
are from the Postvibration test however it doesn't change much with time)

Location	       Detector Bias	  PostVib_roll_error
3A7            0.37                     0.28
3A1            0.47                     0.05
1FF3            0.57                    -0.07
1FF8            0.71                    -0.18
1A2             0.79                     0.38
1FF9            0.85                    -0.18
1B8             0.86                     0.61
1B7             0.88                    -0.52
3FF6            0.89                    -0.25
3FF4            0.90                    -0.19
1FF6            0.91                    -0.22
3A6             0.93                    0.08
3B6             0.95                    0.14
1B5             0.95                    0.10
1A6             1.01                    -0.20
1FF1            1.01                    -0.20
1FF7            1.03                    -0.56
3FF5            1.07                    0.87
1B6             1.07                    0.52
1FF2            1.07                    -0.26
3B3             1.08                    0.89
1A1             1.09                    -0.40

The following list shows the time spent working on the grating during initial 
alignment.  Not all gratings are evaluated here because the data is 
determined by subtracting alignment completion times.  This is somewhat of a 
stability indicator because the gratings with longer time usually had greater 
sensitivity and variation in sensitivity to roll induced by pressure of the 
two alignment fingers.
Location	       Elapsed_time
3FF2   0:32:41
1B4    0:27:36
6FF1   0:21:11
4B1    0:17:03
4B3    0:16:48
3A7    0:15:41
3EE7   0:15:32
4FF6   0:13:45
1A1    0:13:37
6EE4   0:13:36
1A2    0:13:36
3A4    0:12:41
3EE4   0:12:35
6A2    0:12:25
1A3    0:12:24
4A5    0:12:19
4A4    0:12:12
6A4    0:12:09
6B4    0:11:41
1EE7   0:11:36
6FF4   0:11:20
1EE4   0:11:18
1B5    0:10:52
3B4    0:10:33
4A7    0:10:17
1B8    0:10:16
3B2    0:10:14

Listed below are gratings which showed slightly erratic behavior.  The 
gratings in sector A and B behaved well compared to these.
3EE2    .8 jump preglue,       -.6 jump postvib

3EE3   -.8 jump at postvib

3EE4   -.8 jump at postvib

1FF7   -.6 jump at postviba


Sectors A and B looked nice and stable.

Dick