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|  MIL-T-46385A(MU)
dioptometer's optical axis to the optical axis of the unit under test and
obtain a clear sharp image of the telescope reticle on the optical axis.
Make all measurements on the dioptometer by adjusting the objective assembly.
Any and all adjustments to be within the limits of 3.8.3. Rotate the
telescope's eyepiece assembly and observe the amount of rotation from the
zero diopter reading for conformance to the requirement outlined in 3.8.3.
4.6.2.7 Reticle plumb travel. - With the telescope positioned as outlined
in 4.6.2.2, observe where the intersecting point of the boresight cross of
the sliding reticle falls with respect to the intersecting point of the
projected reticle centerlines. By means of the range knob, activate the
boresight cross from reticle's geometric axis (20 nil graduation) to each
extreme of the mil scale and observe parallelism between this intersecting
point and the projected reticle centerline. Parallelism to be maintained
with the limits of 3.8.8.
4.6.2.8 Reticle shift. - With the telescope positioned as outlined in
4.6.2.2, sight through the telescope and observe coincidence between the inter-
secting point boresight cross and the projected center reticle lines while
rotating the range knob first in the clockwise and then counterclockwise
direction. Rotation of the knob shall not shift the horizontal line of the
boresight cross in excess of the limits of 3.8.60 During this rotation of
the range knob also observe that the horizontal line of the boresight cross
does not shift from the zero range lines when coincidence has been established
as outlined in 4.6,2.2.
4.6.2.9 Parallax. - This test may be performed with the telescope posi-
tioned as outlined in 4.6.2.2. Adjust the collimator projector to either
parallax kistance specified in 3.8.10. Sight through the telescope and by
means of the range knob position the horizontal line of the boresight on the
geometric axis of the telescope under test (use 20 mil graduation for location
of teometric axis). Observe any apparent movement between the intersecting
point of the boresight cross and the intersecting point of the projector
collimators center horizontal and vertical reticle lines. Any apparent move-
ment between these two points when the inspectors head is moved up and down
or from side to side is considered parallax. The amount of movement shall
not exceed the limits specified in 3.8.10. Repeat this procedure wiht the
projector collimator set to infinity.
4.6.2.10 Resolution. - TO perform this test, a wall target containing
the appropriate resolution target shall be employed. Construction of the
resolution target and the method of inspection shall be as outlined in
MIL-O-13830. The telescope must resolve the test pattern within the limits
outlined in 3.8.7. Durin this test, the telescope may be supported in a
"V" block. The use of packing or shims may be used to position the tele-
scope. When making this test, use a dioptometer having a minimum of 3 power.
4.6.2.11 Image tilt. - This test may be performed with the telescope
positioned as outlined in 4.6.2.2. The test is performed by sighting through
the auxillary telescope and observe parallelism between the center vertical
reticle line of the projector collimator and the center vertical reticle line
of the auxillary telescope. They must be parallel within the limits of the
angular lines of the projector collimator reticle to assure compliance with 3.8.5.
10.
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