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|  MIL-P-48619(AR)
4.6.3.3 Vibration "B". -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. Subsequent to the test
of 4.6.3.1, the periscope shall be vibrated in accordance with
MIL-STD-810, Method 514.2, Procedure VIII,except the test level and
frequency range shall be as specified in 3.6.2. Vibration shall be
applied along three mutually perpendicular axes of the periscope.
Vibrating equipment capable of providing the test level and
frequency ranges specified above shall be utilized for this test.
The vibrating equipment shall be in accordance with the "Tolerance
of Test Conditions" specified in the "General Requirements" of
MIL-STD-810. The vibrating equipment shall also be capable of
vibrating the periscope along three mutually perpendicular axes
while the periscope is maintained in it's normal mounting or
operating position (as depicted in the front view on Drawing
11747440). The periscope shall be clamped on the vibrating
equipment by means of an appropriate adapter having the same inter-
face features of Mount Periscope: M118E1. The input coupling shall
be immobilized to any position that shall prevent it from contacting
the travel stops during vibration. Prior to vibration, the image
intensifier tube and the reticle projector lamp shall be energized
in accordance with 3.6.2. After allowing a 15 second tube stabil-"
ization 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. The periscope shall
then be vibrated in accordance with the test procedure specified
above and swept logarithmically for the time period specified in
3.6.2. During each vibration sweep 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 inten-
sifier tube nor the reticle projector lamp. Immediately following
the vibration 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 3.6.2.
Vibration testing of each head, daylight body and passive
NOTE:
elbow assembly is not required when the complete periscope is
subjected to vibration (see 3.1). A record of all data
(collimation, pre-vibration settings, etc.) necessary to
determine compliance with required performance shall be
available.
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