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MIL-T-50384(MU)
limits outlined in 3.8.7. During this test, the telescope may be supported
in a "V" Block. The use of packing or shims may be used to position the
telescope. 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.
4.6.2.12 Parallelism of image and reticle. - With the telescope and
fixture positioned as outlined in 4.6.2.1, sight through the telescope
and observe parallelism between the mil scale vertical line and the
corresponding projected reticle line. the extent of non-parallelism is
to be estimated and shall not exceed the width of the mil scale to
assure conformance with paragraph 3.8.9.
4.6.2.13 Reticle accuracy. - This test may be performed with the
telescope positioned as outlined in 4.6.2.2. To facilitate this inspec-
tion, the telescope may be unlocked in the adapter and the zero range
graduations of the reticle placed in coincidence with zero range lines of
the projected target. To obtain this coincidence, shim the unit in the
mount. When this coincidence has been established, observe coincidence
between the maximum range line of the scales. They must be within the
limit lines of the projected reticle for each scale to assure compliance
with 3.8.4.
4.6.2.14 Operability. - This test will be performed at the temperature
specified in 3.9 using a torque wrench and appropriate adapters. Running
torque readings shall conform to the limits specified in 3.9.
4.6.2.15 Reticle illuimination. - Place the instrument in a dark room
having a controlled light source. The obsever and instrumentt mustbecome
dark adapted. Prior to performing the test, place a white matted surface
approximately 2 feet from the telescope window. Perform the test by
observing reticle pattern and determine that this pattern is clearly
discernible by the means of the self-illuminating source in the dark room.
Gradually raise the level of illumination to where the pattern becomes in-
discernible. Place a fixed stop having an aperture as specified in 3.10
over the objective window and observe that the reticle pattern is again
clearly discernible by means of the self-illuminating source, Raise
ambient level of illumination to 10 foot candle, remove the fixed stop
and observe the reticle pattern. It shall appear as when viewed in
ambient light condition to assure conformance with 3.10.
11

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