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|  MIL-P-48450A(MU)
and frequency range shall be as specified in 3.4.3.1. 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 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
Sheet 1 of Drawing F11727450). 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
3.4.3.1. 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 3.4.3.1. 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 follow-
ing the vibration test the periscope shall be subjected to the tests in
4.6.3.5 through 4.6.3.6.2 inclusive. Periscopes that have passed the
above tests shall then be subjected to the-tests specified in 4.6.4, 4.6.5,
4.6.3.7 and 4.6.3.8 respectively, to determine overall conformance with
3.4.3.1.
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, pre-vibration settings, etc.) necessary to
determine compliance with required performance shall be
available.
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 and 4.6.3.1.1
to determine compliance with 3.6.3. Subsequent to the above tests, the
periscope shall be vibrated in accordance with Test Method 514.2, Procedure
VIII (Tracked Vehicles) of MIL-STD-810, except the test level and frequency
range shall be as specified in 3.4.3.2. 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 speci-
fied 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 Sheet 1 of Drawing F11727450).
The periscope shall be clamped on the vibrating equipment by means of an
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