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Assembling passive elbow to head assembly |
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|  MIL-P-48571(MU)
4.6.3.7 Collimation repeatability.
4.6.3.7.1 Assembling daylight body to head assembly.- Perform this
test subsequent to test in 4.6.3.6. Remove the daylight body from the head
assembly. Repeated removal and installation (a minimum of three times)
shall be performed. The periscope shall be inspected after each installa-
tion for repeatability of the daylight collimation measurement recorded in
4.6.3.6. The periscope shall meet the requirements specified in 3.8.4.1,
as measured on the boresight knob scales.
4.6.3.7.2 Assembling passive elbow to head assembly.- Perform this
test subsequent to the test in 4.6.3.7.1. Remove the passive elbow from
the head assembly. Repeated removal and installation (a minimum of three
times) shall be performed. The periscope shall be inspected after each in-
stallation for repeatability of the passive collimation setting recorded in
4.6.3.6. The periscope shall meet the requirements of 3.8.4.1, as measured
on the boresight knob scales.
4.6.4 Modules.- Subsequent to the examinations and tests on the peri-
scope, the head body and elbow assemblies shall be separated and separately
subjected to the "post-vibration" requirements and tests specified in their
respective module specifications identified in 3.1. Subsequent to meeting
the respective module specification post-vibration requirements and tests,
the head, body and elbow assemblies shall be examined and tested in accord-
ance with 4.6.5 to determine conformance to cleanliness as specified in 3.7.
4.6.5 Cleanliness.- Each separate assembly (see 4.6.4) shall be sub-
jected to the, tests in 4.6.5.1, 4.6.5.2 and 4.6.5.3 respectively, to deter-
mine compliance with 3.7.
4.6.5.1 Body assembly (daylight).- The optical surfaces of the body
assembly shall be visually examined with the unaided eye. While viewing
through each end of the module, inspection for defects shall be made by
the technique of shadowing. While viewing through the eyepiece, inspection
for dirt shall be made by viewing a uniformly illuminated field having a
brightness of approximately 300 apparent foot candles. The body assembly
(daylight) shall conform to the requirements of 3.7a and 3.7b(l).
4.6.5.2 Elbow assembly (passive).-
The image intensifier tube shall
be de-energized for this portion of the test. With a light source held
close to the objective window and the eyelens, view the glass components
of the elbow assembly to determine compliance with the cleanliness require-
ments of 3.7a. Upon successful completion of this portion of the test, en-
ergize the image intensifier tube from a power source capable of supplying
and maintaining 24 volts DC. The image tube shall be permitted a stabili-
zation period of 15 seconds prior to performing the cleanliness test. Sub-
sequent to the tube stabilization period, obtain best focus of the phosphor
grain on the screen of the image tube by adjustment of the eyepiece diopt-
er ring. The screen surface of the image tube shall then be visually in-
spected for -cleanliness in accordance with 3.7b(2) and shall conform to
the requirements specified therein. "Cold" and "Hot" spots on the screen
surface of the image tube shall not be considered dirt.
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