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|  MIL-T-50384(MU)
F8566269 and the unit under test to the fixture as outlined in the adapter
set-up instructions. Upon completion of all set-up instructions, the unit
shall be orientated as outlined in 3.8.1.
4.6.2.2 Collimation (pre-vibration). - With the unit positioned as
outlined in 4.6.2.1, position the intersecting point of the boresight cross
of the sliding reticle in coincidence with the horizontal reticle line of
the projected reticle. Observe where this point falls with respect to the
vertical limit lines of the projected reticle target. This intersecting
point must fall within the limits of the pip lines to assure conformance
with 3.8.2.2. Record this position. When this coincidence has been
established, sight through the telescope and observe where the left and
right zero range lines fall with respect to the projected target line.
Both extreme zero range lines must coincide to this target line within
the limit of the tolerance lines located above and below this projected
target line to assure conformance with 3.8.2.1. Record this position.
Also observe where the vertical line of the HEX M482 scale falls with
respect to the corresponding target line. this vertical reticle line
must coincide with the limits of projected reticle tolerance lines to
assure conformance with 3.8.2.1. Record this position. By means of the
range knob, raise the horizontal line of the boresight cross to coincide
with extreme right zero range line and observe where the opposite end of
this horizontal line falls with respect to the extreme left zero range
line. They must coincide within the limits of 3.8.2.2. Use one half the
space of the tolerance lines used when determining the locating of the
extreme zero range line. Record this position.
4.6.2.3 Vibration. - This test shall be performed using devices the
accuracy of which shall be equal or exceed the accuracy depicted on
Drawings F7560085 and F8295974. The test is to be performed as outlined
in Procedure V of MIL-F-13926, however, the frequency and duration shall
be as outlined in 3.5.At the conclusion of the test, the unit under
test shall be subjected to a visual and tactile examination and shall
be subjected to the following test to determine conformance with 3.5.
4.6.2.4 Cleanliness. - The unit under test shall be subjected to the
test procedures outlined in MIL-O-13830 for conformance to the require-
ments outlined in 3.6.
4.6.2.5 Post-vibration. - Reassemble the unit to the final test
fixture and repeat the test procedure outlined in 4.6.2.2. The unit under
test shall not have moved from the previously recorded settings for those
requirements outlined in 3.8.2.1 and 3.8.2.2.
4.6.2.6 Eyepiece focus. - This test is to be accomplished by placing
a white background in front of the telescope's window. Eyepiece focus is
to be measured using a 3 power dioptometer conforming to the accuracies
depicted on Drawing 7680631. Adjust the dioptometer eyepiece assembly to
the dioptometer's optical axis. Next direct the dioptometer's line of
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