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|  MIL-T-60895(MU)
4.7 Performance testing.
4.7.1 Orientation. - Proper orientation of the panoramic telescope
is assured when mounted and secured to an adapter, the accuracy of which
shall be equal to or better than the accuracy-depicted on Drawing F8599913,
and when aligned as outlined in set-up instructions specified on Drawing
F8599913. With the panoramic telescope positioned on the fixture as out-
lined above the line of sight, elbow assembly, counters and the click
mechanism shall be set as specified in 3.6.
4.7.2 Collimation.
4.7.2.1 Previbration. - With telescope positioned as outlined in
4.7.1 observe coincidence between the panoramic telescope line of sight
and the optical axis of the test reticle (target) in the collimator
projector. This coincidence must be within the limits outlined in 3.7.1.1.
Record this position. Exercise care not to move the setting of the panora-
mic telescope.
4.7.2.1.1 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 3.3.4. At the conclusion of the test, the telescope shall
be subjected to a visual and tactile examination and shall be subjected
to the following performance test to determine conformance with 3.3.4.
4.7.2.1.2 Post vibration. - Immediately after completing the vibration
test re-assemble the telescope to the adapter and without disturbing any
previous settings observe where the panoramic telescope's optical line of
sight falls upon the projector collimator reticle. This observed point and
the recorded position (4.7.2.1) shall coincide within the limits specified
in 3.7.1.2.
4.7.2.1.3 Cleanliness. - The panoramic telescope shall be tested for
cleanliness by using the shadowing technique outlined in MIL-O-13830. At
the conclusion of this test, dirt particles shall not exceed th elimits
outlined in 3.5.
4.7.2.1.4 Image tilt. - With the panoramic telescope and fixture
positioned as outlined in 4.7.1, image tilt shall be observed by sighting
through Collimator F5549108 aligned to the optical axis of the eyepiece
assembly and note parallelism between its vertical reticle line and the
vertical line of the collimator target. Both lines shall be parallell
within the limits provided on the projected target (collimator reticle)
to assure conformance with the 3.7.2. Repeat this test with the elbow
assembly against each of the stops to assure conformance with 3.7.2.
Again observe parallelism between the reticle lines. Repeat this test at
eight different azimuth counter settings in 6400 mils of rotation. Each
setting in azimuth will require the azimuth fixture plate to be rotated
an equal amount in an opposite direction to permit reestablishing the line
11.
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