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|  MIL-P-48619(AR)
4.6.3.2 Vibration "A". -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 3.6.1. Vibration shall be
applied along each of 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 Require-
ments" of MIL-STD-810. The vibrating equipment shall also be
capable of vibrating the periscope along three mutually perpen-
dicular 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
interface features as 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 3.6.1. After allowing 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 vibrated in accordance with
the test procedure specified above and swept logarithmically for the
time period specified in 3.6.1. 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 intensifier 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 respect-
ively, to determine overall conformance with 3.6.1.
NOTE:
Vibration testing of each head, daylight body and passive
elbow assembly is not required when the complete periscope is
subjected to vibration (see 3.1). A record of all data
(collimation, previbration settings, etc.) necessary to
determine compliance with required performance shall be
available.
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