MIL-PRF-49150D (CR)
3.4 Materials. The contractor shall select parts and materials
that are fully capable of meeting all of the operational and
environmental requirements specified herein. The materials specified
in the applicable drawings are recommended, but not mandatory.
Selection criteria of the class, grade or type part shall ensure the
material will be able to perform its intended function when it is
assembled. Verification of the supplier meeting the overall
performance requirements shall be the governing acceptance standard.
Recovered materials shall be used to the maximum extent possible.
3.5
Performance characteristics.
3.5.1 Angular deflection. An optical ray perpendicular to the
mounting flange shall be deflected through an angle of 108, ± 2
degrees for Type I and 90, ± 2 degrees for Type II, Type III and Type
IV.
3.5.2 Resolution. The resolution shall be 7 line-
pairs/milliradian or better when rotated ±15 degrees about a center
35mm from the mounting flange and a telescope of 8 power (X) or
greater with a 30mm aperture is used. The telescope may be focused a
maximum of 0.03 diopter from infinity for best focus.
3.5.3 Transmission. The transmission shall be 80 percent
minimum over the entire aperture in the spectral region defined by a
2854K, ± 200K source and an S-20 extended-red (ER) detector.
3.6
Environmental.
3.6.1 Temperature Extremes. The entrance assembly shall not be
damaged nor suffer degradation of performance (3.10.1 and 3.10.4)
after being subjected to storage at +68°C and -51°C. The entrance
assembly shall not be damaged nor suffer degradation of performance
(see 3.10.1 and 3.10.4) after being subjected to repetitive
temperature changes between +23°C and -51°C within 5 minutes and
between +23°C and +68°C within 5 minutes. The soak time at each
temperature extreme shall be sufficient for the entire entrance
assembly to achieve stabilization at the specified temperature. 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.
3.6.2 Humidity. The entrance assembly shall not be damaged nor
suffer degradation of performance after being subjected to +68°C and 94
±4 percent humidity (see 3.10.1 and 3.10.4).
3.6.3 Immersion. The entrance assembly shall not be damaged
(see 3.10.1) after being immersed in fresh water to a depth of not
less than 3 feet for a period of not less than 30 minutes. The
entrance assembly shall be pre-conditioned by exposure to temperature
of +45°C ±3°C for a period of 2 hours prior to being immersed in the
fresh water at a temperature of +18°C ±5°C.
3.6.4 Vibration. The entrance assembly shall not be damaged nor
suffer degradation of performance (see 3.10.1 and 3.10.4) after being
subjected to vibration equivalent to that encountered in tracked
vehicles during 5000 miles of operation. Vibration shall be limited
to one sine sweep from 5.0 to 500 Hertz (Hz.) and back to 5.0 Hz
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