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|  MIL-T-46316B(MU)
4.7.2 Collimation.
4.7.2.1 Previbration.- With the telescope positioned as outlined in
4.7.1, observe coincidence between the intersecting point of the vertical
reticle line and the horizontal line designated as the normal line for
boresighting (N), to a comparable collimator projector reticle mark. This
coincidence must be within the limits outlined in 3.7.1. Record this
position. Repeat this procedure using alternate reticle, if provided,
and observe coincidence for conformance with 3.7.2. Inspect telescope
for cleanliness using techniques outlined in MIL-O-13830 for conformance
with 3.4. Exercise care not to move telescope settings.
4.7.2.2 Vibration.- This test shall be performed using a testing
device, the accuracy of which shall be equal to or exceed the accuracy
depicted on Fixture Drawing F7560085. The test shall be performed as
outlined in Procedure V of MIL-F-13926; however, the duration shall be
as specified in 3.3.3. At the conclusion of the test, the telescope
shall be subjected to a visual and tactile examination and shall be sub-
jected to the following performance test to determine conformance with
3.3.3. Repeat test for cleanliness.
4.7.2.3 Post vibration.- Immediately after completing the vibration
test and test for cleanliness, reassemble the telescope to the testing
fixture or medium without disturbing any previous settings. Observe where
the intersecting point of the telescopes reticle fall upon the collimator
projector reticle with respect to the recorded position observed in 4.7.2.1.
They must coincide within the limits of 3.7.1. Repeat this procedure
using alternate reticle and observe coincidence for conformance with re-
quirement outlined in 3.7.2.
4.7.2.4 Boresight error due to reticle rotation.- Position the
telescope as specified in 4.7.1. By means of the cant knob rotate the
objective end of the telescope five (5) degrees to the right or left.
When the cant knob is moved the intersecting point of the telescope reticle
lines (see 4.7.1) shall not move from the position established in 4.7.1
beyond the limit specified in 3.7.5. Repeat this procedure in the
opposite direction. Repeat both procedures (right and left cant) when
alternate reticle is used.
4.7.2.5 Eyepiece focus.- This test is to be accomplished by placing
a white background in front of the telescope s objective lens. 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 reticle until a clear sharp image appears
on the dioptometer's optical axis. Next direct the dioptometer's line
of sight toward a 500 feet distant target such as a smoke stack, edge
of a building, or some other well defined target image. Adjust the ob-
jective assembly until parallax is removed. Set the dioptometer scale
to sero diopters. Parallax is defined as any apparent movement between
the reticle and target image when the head is moved from side to side or
up and down.
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