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Page Title:
Performance, elbow assembly with image tube installed |
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|  MIL-E-48441A(MU)"
cycle, the screen surface of the tube and the reticle pattern shall be
monitored to assure that there is no failure or flicker of light emission .
from the image intensifier tube nor the reticle projector lamp. Immediately
following the vibration cycle, and prior to the examination for physical.
defects resulting from poor workmanship and materials, the elbow assembly
shall be subjected to the test in 4.6.5.3 and then tO the test. in 4.6.5.4.
Elbow assemblies that have passed the above tests shall then be subjected
to the tests specified in 4.6.6, 4.6.7 and 4.6.8.
4.6.5.5.2 Shock.- This test shall be performed on elbow assemblies
procured as a repair part item. When the elbow assembly is provided
with a complete. periscope this shock test will not be required when the
complete periscope-is subjected to shock. Prior to performing this
test, the elbow assembly. shall be subjected to the test procedure specified
in 4.6.5.1 to determine compliance with 3.6.4. The shock equipment and .
test procedure shall be in accordance with Procedure I, of Method 516.2
specified in MIL-STD-81O, except conditions such as "G" values, time
duration and wave form shock pulse shall be as specified in 3.6.5.3.
The elbow assembly shall be clamped on the shock equipment by means of
an appropriate adapter having the same interface features as Periscope:
M32E1, M35E1 and M36E1. Prior to shock, the image intensifier tube and
reticle projector lamp shall be energized in accordance with 3.6.5.3.
After allowing a 15-second tube stabilization period, the screen surface
of the tube shall be illuminated and the reticle pattern shall be projected
into the optical system when observed through the elbow assembly eyepiece.
The elbow assembly shall then be shocked in accordance with the test
procedure specified above, except the application of shock along the
vertical axis shall be in one direction only (normal operating position .
of the elbow assembly). Subsequent to each shock, the screen surface of
the tube and the reticle pattern shall be observed. During these observations>
there shall be no failure or flicker of light emission from the image
intensifier tube nor the reticle projector lamp. Immediately following
the shock test, and prior to the examination for physical defects resulting
from poor workmanship and materials the elbow assembly shall be subjected
to the test in 4.6.5.3 and then to the test in 4.6.5.4. Elbow assemblies
that have passed the above test shall then be subjected to the tests
specified in 4.6.6, 4.6.7 and 4.6.8.
4.6.6 Performance, elbow assembly with image tube installed. - The
following tests shall be performed for compliance with 3.6 and 3.6.3. .
The elbow assembly shall be mounted on special testing equipment conforming
to the requirements of 4.5.2.3.2. Set-up of the test equipment, together
with the mounting and securing of the elbow assembly on the test equipments
shall be performed in accordance with the instructions contained on the
test equipment drawing. Unless otherwise specified during these tests,
Collimator "G" shall be adjusted for infinity; the image intensifier
tube and reticle projector lamp shall be energized in accordance with
3.6.3.1 and 3.6.3.2; the Focusing Ring 11733436 shall be adjusted for
best focus of the target image after the diopter adjustment ring of the
eyepiece is set for best focus of the phospher grain on the image intensifier
tube; and Holder "T" containing Telescope "J" with Special Reticle "L" shall
be removed from the optical line of sight of the test equipment. The image .
intensifier tube shall be permitted a stabilization period of 15 seconds prig
to conducting the optical tests.
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