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|  MIL-P-48450A(MU)
of the periscope and mount. Vibration shall be applied along each of
three mutually perpendicular axes of the periscope. The vibration shall
be sinusoidal as follows:
a. At a frequency of 5 Hertz (Hz), the acceleration shall be
1.0 G (peak).
b. During a frequency sweep of 5 to 500 Hz, maintain constant
acceleration of 1.0 G (peak).
c. During a frequency sweep of 500 to 5 Hz, maintain constant
acceleration of 1.0 G (peak).
At 5 Hz, the acceleration shall be 1.0 G (peak).
d.
The frequency of applied vibration shall be swept logarithmically in 15
minute 1 minute sweep cycles for a total of 15 minute 1 minute along
each of the three mutually perpendicular axes (total vibration time 45
minutes 3 minutes). There shall be no failure or flicker of light
emission from the image intensifier tube nor the reticle projector lamp
during vibration and the periscope shall show no evidence of physical
failure subsequent to vibration. Following the vibration test the
periscope shall meet the requirements of 3.6.3.2, 3.6.4.1, 3.6.9, 3.6.2,
3.6.3.1, 3.6.3.1.1, 3.6.3.1.2, 3.6.5, 3.6.6, 3.6.6.1, 3.6.7, 3.6.8, 3.2,
3.1, 3.5 and then each module (see 3.1) shall meet their own respective
post-vibration test requirements.
3.4.3.3 Shock.- This requirement shall be met with the image
intensifier tube and reticle projector lamp energized by the application
of +24 6.0 VDC to Contact 11733497 (Reference Drawing F11733401). The
shock input to the periscope shall be at the interface of the periscope
and mount. The periscope shall be subjected to 24 cumulative shocks
consisting of three each at 100 G's$ then 40 G's, applied in each direction
along each of the two mutually perpendicular horizontal axes (all four
sides). The periscope shall also be subjected to six cumulative shocks
consisting of three each at 90 G's, then 35 G's applied in one direction
along the verticle axis (normal operating position of periscope only).
The shock pulse shall have a half sine wave. For 100 G's 10% and 90
G"s + 10% the shock pulse shall have a time duration of 3 .2 milli-
seconds; for 40 G's 10% and 35 G's - 10% the shock pulse shall have a
time duration of 18 3 milliseconds. Subsequent to shock, there shall
be no failure or flicker of light emission from the image tube nor the
reticle projector lamp. The periscope shall also show no evidence of
physical failure. Following the shock test the periscope shall meet the
requirements of 3.6.3.2, 3.6.4.1, 3.6.9, 3.6.2, 3.6.3.1, 3.6.3.1.1,
3.6.3.1.2, 3.6.5, 3.6.6, 3.6.6.1, 3.6.7, 3.6.8, 3.2, 3.2, 3.1, 3.5 and
then each module (see 3.1) shall meet their own respective post-shock
test requirements.
3.5 Cleanliness.- With the periscope disassembled, the three
modular units shall meet the following requirements:
a. Defects.- There shall be no evidence of moisture, grease,
fingerprints, condensates, fractures, and adhesive separations on any
glass component when viewing through either end of each module (including
the unity power system).
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