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Page Title:
Post-Vibration/Post-Shock examination |
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|  MIL-P-48619(AR)
4.6.3.4 Shock. -Prior to performing this test, the periscope
shall be subjected to the test procedure specified in 4.6.3.1 to
determine compliance with 3.8.3. The shock equipment and test
procedure shall be in accordance with MIL-STD-81O, Method 516.2,
Procedure I, except conditions such as "G" values, time duration and
wave form shock pulse shall be as "specified in 3.6.3. The periscope
shall be clamped on the shock equipment by means of an appropriate
adapter having the same interface features as Mount Periscope:
M118E1. Prior to shock, the image intensifier tube and reticle
projector lamp shall be energized in accordance with 3.6.3. The
input coupling shall be immobilized to any position that shall
prevent it from contacting the travel stops during the shock test.
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
periscope eyepiece (passive). The periscope shall then be shocked
in accordance with the test procedure specified above, except the
application of shook along the vertical axis shall be in one
direction only (normal operating position of the periscope). Sub-
sequent 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, the periscope shall be subjected to the
tests in 4.6.3.5 through 4.6.3.7.2 inclusive. Periscopes that have
passed the above tests shall then be subjected to the tests
specified in 4.6.6, 4.6.7, 4.6.4 and 4.6.5 respectively, to
determine overall conformance with 3.6.3.
NOTE:
Shock testing of each head, daylight body and passive elbow
assembly is not required when the complete periscope is
subjected to shock (see 3.1). A record of all data
(collimation, pre-shock settings, etc.) necessary to
determine compliance with required performance shall be
available.
4.6.3.5 Post-Vibration/Post-Shock examination. -Subsequent to
vibration/shock test, the periscope shall be thoroughly examined for
physical defects resulting from-poor workmanship and materials to
determine compliance with 3.6, prior to being subjected to the
remaining tests specified herein. A visual examination shall also
be made for missing or damaged parts, glass chips, foreign matter
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