TM 5-6675-323-14
h. Rotate autocollimator until virtual and reflected cross hair images
are the collimation error. Difference between virtual and reflected
vertical line is X-axis error, and difference between virtual and
reflected horizontal line is Y-axis error.
Loosen locknuts. Then alternately tighten and slacken adjustment
i.
screws to remove X-axis error.
Loosen locknuts. Then alternately tighten and slacken adjustment
j.
screws to remove Y-axis error.
k. Observe X-axis error and readjust screws to obtain closest possible
fit between reflected and virtual image.
Lift mirror and move to position on edge of view field. At each
1.
position, center autocollimator and observe error.
NOTE
Allowable error is 10 minutes of arc in X- or Y-direction.
If error exceeds allowable error, make collimation adjustment a t
m.
worst point and center point to bring all points as close as pos-
sible to specification.
n.
Tighten locknuts on adjusting screws without changing adjustment
setting.
R e m o v e and store mirror.
o.
Unplug and secure autocollimator.
p.
Reinstall stereoscope.
q.
5-45
