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|  MIL-P-48571(MU)
assure that there is no failure or flicker of light emission from the image
intensifier tube nor the reticle projector lamp. Imediately 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 3.6.1.
NOTE: Vibration testing of each head, daylight body and passive elbow
assembly is not required when the complete periscope is sub-
jetted to vibration (see 3.1). A record of all data (collima-
tion, pre-vibration settings, etc.) necessary to determine com-
pliance 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 to determine
compliance with 3.8.3. Subsequent to the test-of 4.6.3.1, 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 3.6.2. 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 F11747400).
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 mobilized to any position that shall
prevent it from contacting the travel stops during vibration. Prior to vi-
bration, the image intensifier tube and the reticle projector lamp shall be
energized in accordance with 3.6.2. After allowing a 15 second tube stabi-
lization 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 intensifier tube nor the reticle projector lamp. Immediately foll-
ing the vibration test, the periscope shall be subjected to the test. The
periscope shall be subjected to the tests in 4.6.3.5 through 4.6.3.7.2 in-
clusive. 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.
NOTE:
Vibration testing of each head, daylight body and passive elbow
assembly is not required when the complete periscope is sub-
jected to vibration (see 3.1). A record of all data (collima-
tion, pre-vibration settings, etc.) necessary to determine
compliance with required performance shall be available.
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