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Page Title:
Parallelism of image and reticle |
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|  MIL-T-46316B(MU)
Align the dioptometer's optical axis to the telescope optical axis and
obtain a clear sharp image of the telescope's reticle on the optical
axis. Make all measurements on the dioptometer by adjusting the ob-
jective assembly. Any and all adjustments to be within the limits of
3.7.6. Repeat this procedure after sliding the alternate reticle
(when required) into position.
4.7.2.6 Parallelism of image and reticle.- With the telescope
positioned as outlined in 4.7.1, observe coincidence between one end of
the instrument's horizontal reticle line with respect to the comparable
projector collimator's horizontal reticle line and observe where the
opposite end of the telescope horizontal reticle line falls with re-
spect to the projector collimator horizontal line, both lines must coin-
cide within the "limits specified in 3.7.3. Repeat this procedure using
alternate reticle when provided.
4.7.2.7 Parallax.- Using the set-up outlined in 4.7.1, parallax
will be checked after the distances specified in 3.7.8 have been set
into the projector collimator. The test is performed by aligning a re-
ticle line or mark near or on the optical axis of the projector colli-
mator reticle. Observe this positioning, there shall be no apparent
movement between the selected lines or mark when the observer moves his
head from side to side or up and down. Reticle displacement shall not
exceed the limits outlined in 3.7.8. Use the thickness of the elbow
telescope reticle line to estimate any apparent movement.
4.7.2.8 Reticle accuracy.- Reticle accuracy may be assured by
aligning the normal line for boresighting of the telescope under test
to the corresponding reticle line of the projector collimator. Ad-
justments may be made by means of loosening the telescopes in the test
fixture to obtain coincidence. When coincidence has been established,
observe where the maximum range graduation of telescope's reticle falls
with respect to the corresponding reticle line of the projector colli-
mator. They must coincide within the limits of the reticle tolerance
mark to assure compliance with 3.7.4.
4.7.2.9 Resolution.- This test may be performed after directing
the line of sight toward a target similar to that. specified in MIL-O-
13830. The actual test is performed as outlined in MIL-O-13830. Ob-
serve the definition pattern on the target. The patterns must be re-
solved in the four meridians within the limits outlined in 3.7.7.
4.7.2.10 Sealing.- This test shall be performed on a 100% basis
using testing equipment the accuracy of which shall conform to the
accuracy depicted on Drawing F8565556. When using pressure test fixture,
the fixture shall be set-up as outlined in set-up instructions shown on
Drawing F8565556, Sheet 1. The gas used shall be dry nitrogen having a
"dew point of -25F. After connecting the test equipment to the telescope
adjust the pressure to the pressure specified in 3.5 and maintain the
pressure for the time specified in 3.5. Pressure gage shall remain com-
stant to assure compliance with 3.5. At the completion of this test,
connect a dew point tester to the exit port and purge the telescope
until -25F is recorded and seal the unit containing the pressure speci-
fied in 3.5.
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