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Page Title:
Post-Vibration/Post-Shock examination |
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|  MIL-P-48571(MU)
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 com-
pliance with 3.8.3.
The shock equipment and test procedure shall be in
accordance with Procedure I, of Method 516.2 specified in MIL-STD-810,
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 accord-
ance 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 eye-
piece (passive). The periscope 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 periscope). 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,
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 sub-
jected 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.
Shock testing of each head, daylight body and passive elbow
NOTE:
assembly is not required when the complete periscope is sub-
jected 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 the vi-
bration/shock test, the periscope shall be thoroughly examined for physical
defects resulting from poor workmanship and materials to determine compli-
ance 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 and bonding (separations, chipping or
rupture). An audible examination shall be made for loose internal optical
and mechanical components. Any one of the possible defects above shall be
cause to consider a periscope defective.
4.6.3.6 Post-Vibration/Post-Shock collimation.- Subsequent to the test
in 4.6.3.5, the periscope shall again be subjected to the test procedure
specified in 4.6.3.1. Any difference from the recorded boresight knob
scale settings established in 4.6.3.l, shall not exceed the tolerance speci-
fied in 3.8.3.2, as measured on the boresight knob scales. Record the bore-
sight knob scale settings for use in the tests in 4.6.3.7.
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