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Objective focusing mechanism - Daylight
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Periscope, Tank: M32E1
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Cleanliness



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MIL-P-48571(MU)
Following the vibration test the periscope shall meet the requirements of
3.8.3.2, 3.8.4.1, 3.8.9, 3.8.2, 3.8.3.1.1, 3.8.3.1.2, 3.8.5, 3.8.6, 3.8.6.19
3.8.7, 3.8.8, 3.2, 3.1, 3.7 and then each module (see 3.1) shall meet their
own respective post-vibration test requirements.
3.6.2 Vibration "B".- This requirement shall be met with the image in-
tensifier tube and reticle projector lamp energized by the application of
+24 6.0 VDC to Contact 11733497 (Reference Drawing F11733401). The vibra-
tion input to the periscope shall be at the interface of the periscope and
mount.  Vibration shall be applied along each of three mutually perpendicu-
lar 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 5OO Hz, maintain constant ac-
celeration of 1.0 G (peak).
c. During a frequency sweep of 500 to 5 Hz, maintain constant ac-
celeration of 1.0 G (peak).
d.
At 5 Hz, the acceleration shall be 1.0 G (peak).
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 re-
quirements of 3.8.3.2, 3.8.4.1, 3.8.9, 3.8.2, 3.8.3.1.1, 3.8.3.1.2, 3.8.5,
3.8.6, 3.8.6.1, 3.8.7, 3.8.8, 3.2, 3.1, 3.7, and then each module (see 3.1)
shall meet their own respective post-vibration test requirements.
3.6.3 Shock.- This requirement shall be met with the image intensi-
fier tube and reticle projector lamp energized by the application of +24
6.0 VDC to Contact 11733497 (Reference Drawing F11733401). The shock in-
put 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
vertical 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 mini-seconds; for 40 G's
the shock pulse shall have a time duration of
10% and 35 G's 10%
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.
5

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