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Objective focusing mechanism - Daylight |
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|  MIL-P-48619(AR)
3.5.9 Objective focusing mechanism - Daylight. -This requirement
shall be met with the locking screw backed off a minimum of two full
revolutions from the locked position established in 3.5.8. The
running torque required to rotate Eccentric 8205635 through a
minimum of one full revolution in each direction shall not exceed 30
oz-ins when checked at standard ambient temperature. When checked
at the temperature conditions specified in 3.4.2, the running torque
shall not exceed 50 oz-ins.
3.6 Vibration/Shock.
3.6.1 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
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 sinusoidal as follows:
a. At a frequency of 5 Hertz (Hz), the acceleration shall be-
.5G 6%.
b. During a frequency sweep of 5 to 9 Hz, increase acceler-
ation linearly from .5G to 1.5G's 10%.
c. During a frequency sweep of 9 to 500 Hz, maintain constant
acceleleration of 1.5G's 10%.
d. During a frequency sweep of 500 to 9 Hz, maintain constant
acceleration of 1.5G's 10%.
e. During a frequency sweep of 9 to 5 Hz, decrease acceler-
ation linearly from 1.5G's to .5G 10%.
f.
At 5 Hz, the acceleration shall be .5G 10%.
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
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, 3.8.6.1, 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.
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