 |
|||
|
|
|||
| ||||||||||
|
|  MIL-T-46386A(MU)
Sheet 1. The gas used shall be dry nitrogen having a dew point of -25F.
After connecting the test fixture to the panoramic telescope, adjust
testing pressure to the pressure specified in 3.6.1 and maintain the
pressure for time specified in 3.6.1. Pressure gage shall remain con-
stant to assure compliance with 3.6.1. At the completion of this test
connect a dew point tester to the exit post and purge the optical assembly
until -25F is recorded and seal the unit.
4.6.1.2.1 Sealing (counter assembly). - This test to be accomplished
as outlined above, however, the pressure and time values specified in 3.6.2
shall apply.
4.7 Performance testing.
4.7.1 Orientaiton. - 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 F8565945,
and when aligned as outlined in set-up instructions specified on Drawing
F8213899. With the panoramic telescope positioned on the fixture as out-
lined above the line of sight, elbow assembly, counters and the five mil
click mechanism shall be set as specified in 3.7.1.
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 pro-
jector. This coincidence must be within the limits outlined in 3.7.1.
Record this position. Exercise can not to move the setting of the pan-
oramic 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 out-
lined in Procedure V of MIL-F-13926; however, the duration shall be as
specified in 3.4.3. 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 3.4.3.
4.7.2.1.2 Post vibration. - Immediately after completing the vibra-
tion test reassemble 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 specif-
ied in 3.4.3 Close the cover and observe where the line of sight falls
with respect to the recorded position of the optical axis. They must coin-
cide within the limits outlined in 3.7.1.1.
4.7.2.1.3 Image wander. - With the cover opened and wiht the tele-
scope positioned as outlined in 4.7.1, rotate the telscop azimuth mecn-
anism in one direction to any azimuth setting and rotate the azimuth mech-
anism of the test fixture and equal amount in the opposite direction. Now
observe coincidence between the optical axes. Non-coincidence between the
axes shall not exceed an 18 mil spread to assure compliance with 3.7.2.1.
11
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals