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|  MIL-T-46386A(MU)
4.7.2.1.8 Parallax. - Using the set-up outlined in 4.7.1, parallax
will be checked after each of the distances specified in 3.7.9 has been
set into the projector collimator. The test is performed by aligning a
reticle line or mark near or on the optical axis the projector collimator
reticle. Observe this positioning there shall be no apparent movement
between the selected lines or mark when the observer moves his head from
side to side or up and down. Reticle displacement shall not exceed the
limits outlined in 3.7.9.Use the thickness of the reticle line to
measure apparent movement.
4.7.2.1.9 Reticle accuracy. - Reticle accuracy may be assured by
aligning the intersecting point of the panoramic telescopes verticle and
horizontal reticle line to the corresponding intersecting reticle lines
of the projector collimator Adjustments may be made by means of the
panoramic telescopes azimuth and elevating mechanisms. When coincidence
has been established, observe where the 80 mil graduations of the panoramic
telescope's horizontal reticle line falls with respect to the corresponding
reticle line of the projector collimator. They must coincide within the
limits of the reticle tolerance mark to assure compliance with 3.7.10.
4.7.2.2 Counter operation.
4.7.2.2.1 Gunner aid counters. - This test may be accomplished with
the panoramic telescope positioned as outlined in 4.7.1 with the line of
sight falling upon the projector collimators' reticle as outlined in
4.7.2.1.2. Observe and record the azimuth test fixture reading. Set
any correction reading into either the "L" or "R" counter. Any reading
induced into the right "R" gunner's aid counter shall increase the reset
counter and equal amount and any reading induced into the left "L" gunner's
aid counter shall decrease the reset counter and equal amount to assure
compliance wiht 3.8.2.1.When 50 mils has been inserted into either
gunner's aid counter the reset counter shall reflect an increase or
decrease of 50 mils within the limits outlined in 3.8.2.1 and the correction
counter shall have traveled the minimum excursion outlined in 3.8.2 and
the 6400 mil counter shall remain unchanged (see 3.8.2.1). The test for
accuracy shall be performed by inserting a correction into either the "L"
or "R" gunner's aid counter and observing the appropriate change in the
reset counter. Turn the azimuth fixture plate to traverse the line of
sight in a clockwise direction an equal amount when a correction is placed
into the "L" counter. By means of the azimuth knob of the panoramic
telescope traverse the line of sight in the opposite direction until the
reset counter records 3200 mils. Now sighting through the panoramic
telescope and observe coincidence between the panoramic telescopes optical
axis and the point on the projector collimators reticle established in
4.7.2.1.2. This coincidence must be maintained within the limits specified
in 3.8.2.1. Repeat this procedure at two additional correction readings
and at the 50 mil correction setting of each gunner's aid counter.
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