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MIL-P-48450A(AR)
AMENDMENT 1
15 October 1979
MILITARY SPECIFICATION
PERISCOPE, TANK: M35E1
This amendment forms a part of Military Specification MIL-P-48450A(MU)
dated 15 March 1976.
PAGE 3
Paragraph 3.4.3.1 - Delete and substitute:
"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.O VDC to Contact 11733497 (Reference Drawing
11733401).  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 shall be sinusoidal as follows:
a. A frequency of 5 Hertz(Hz), the acceleration shall be .5 G
10%.
b.  During a frequency sweep of 5 to 9 Hz, increase acceleration
linearly from .5 G to 1.5 G's lO%.
c. During a frequency sweep of 9 to 500 Hz, maintain constant
acceleration of 1.5 G's 10%.
d. During a frequency sweep of 500 to 9 Hz, maintain constant
acceleration of 1.5 G's 10%.
During a frequency sweep of 9 to 5 Hz, decrease acceleration
linearly from 1.5 G's to .5 G lO%.
f.
At 5 Hz, the acceleration shall be .5 G l0%.
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
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 persicope 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."
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