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|  MIL-P-48450A(MU)
3.4 Environmental.
3.4.1 Storage temperature.- The periscope shall show no evidence
of cement separation, glass breakage or other physical failure, and
shall meet all the requirements of this specification at standard ambient
temperature, Plus 60 to plus 90 Fahrenheit (F), after having been
exposed and thermally stabilized at temperatures of minus 80 and plus
o
160 F.
3.4.2 Operating temperatures.- The periscope shall meet the
applicable requirements of 3.6.10 while exposed and thermally stabilized
at temperatures of minus 40 and plus 150F9
3.4.3 Vibration/Shock.
3.4.3.1 Vibration "A".- 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 vibration input to the periscope shall be at the interface
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
.65 G (peak).
b. During a frequency sweep of 5 to 9 Hz, increase acceleration
linearly from .65 to 1.5 G's (peak).
c. During a frequency sweep of 9 to 500 Hz, maintain constant
acceleration of 1.5 G's (peak).
d. During a frequency sweep of 500 to 9 Hz, maintain constant
acceleration of 1.5 G's (peak).
e. During a frequency sweep of 9 to 5 Hz, decrease acceleration
linearly from 1.5 G's to .65 G (peak).
f.
At 5 Hz, the acceleration shall be .65 G (peak).
The frequency of applied vibration shall be swept logarithmically in 15
minute 1 minute sweep cycles for a total of two hours per axis. There
shall be no failure or flicker of light emission from the image intensi-
fier 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.
3.4.3.2 Vibration "B".- 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 vibration input to the periscope shall at the interface
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