MIL-PRF-49063E
3.6.6.5 Reticle movement. Two external control knobs shall control the
position of the reticle pattern viewed by the observer using the sight. One
control shall move the reticle pattern in azimuth; another control shall move
the reticle pattern in elevation. An adjustment made by turning one control
shall not cause the reticle to deviate from a straight line of travel by more
than 0.5 milliradian. Adjustment will be apparent to the operator by tactile
indexing with audible clicks. Each click of the control knob shall displace
the reticle pattern 0.25, ± 0.04 milliradian. Total movement of the reticle
pattern shall be a minimum of 2.5° in any direction from the optical axis.
The torque required to adjust the reticle position shall be between 0.5 and
4.0 inch-pounds. The reticle pattern shall remain in focus throughout the
full range of movement of the range focus control. The reticle pattern shall
not exhibit rotation greater than 1° from its proper orientation.
3.6.6.6 Battery adapter. The sight shall properly operate with the
battery adapter attached and Type BA-3058/U batteries conforming to ANSI
C18.1M, Specification Sheet 20-0571-1988 inserted. The daylight cover may be
installed during this test. Observe the sight for proper illumination.
3.7 Environmental characteristics.
3.7.1 Temperature extremes. The sight shall not be damaged (see
3.10.1) by storage in any temperature from +23°C to +68°C or from +23°C to -
51°C or by operation at any temperature from +23°C to +52°C or from +23°C to -
51°C. The sight shall not be damaged (see 3.10.1) after being subjected to
repetitive temperature changes between +23°C and +68°C in a 5 minute period
and between +23°C and -51°C in a 5 minute period. Soak time at temperature
extremes shall be sufficient for the entire sight to attain stabilization.
Time for temperature stabilization is defined as the amount of time required
for the most internal part of the unit under test to achieve the specified
temperature. Validation of operation shall be observance of a green glow at
the eyepiece at operating temperature and, at low operating temperature, the
ability to operate all controls with arctic gloves or equivalent.
3.7.2 Vibration. The sight shall not be damaged (see 3.10.1) after
being subjected to simple harmonic motion having an amplitude of 0.015 inch
(0.030 inch total excursion) with the frequency being varied between 5 and 55
hertz (Hz). Operation of the sight during vibration shall not be required.
Vibration shall be applied in 3 mutually perpendicular planes, one of which is
perpendicular to the optical axis. The duration of vibration shall be 5
minutes in each plane. The test after vibration shall be resolution.
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