MIL-PRF-49368C (CR)
3.7.2 Vibration. The eyepiece assembly shall not be damaged (see
3.10.1) after being subjected to simple harmonic motion having an amplitude of
0.015 inch (0.03 inch total excursion) with the frequency being varied between
5 and 55 hertz (Hz). 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.
3.7.3 Altitude. The eyepiece assembly shall not be damaged (see
3.10.1) after storage at a pressure equivalent to 10,000 feet altitude above
sea level.
3.7.4 Humidity. The eyepiece assembly shall not be damaged (see 3.10.1)
after storage up to +68°C minimum with 95 ± 5 percent relative humidity.
3.7.5 Immersion. The eyepiece 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 eyepiece assembly shall be pre-
conditioned by exposure to a 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.
3.7.6 High intensity shock. The eyepiece assembly shall not be damaged
(see 3.10.1) by a sequence of 3 shocks applied in each direction along each of
3 mutually perpendicular axes (horizontal, vertical, and optical axis when the
reticle pattern is erect). The shocks shall be half sine pulses and shall
have a time duration of 4 milliseconds ±5 percent. Shock pulses applied along
the axes horizontal and perpendicular to the optical axis shall have a peak
amplitude of 50g's ±15 percent (see 3.10.2). Shock pulses applied along the
optical axis shall have a peak amplitude of 100 ±15g's.
3.8 Marking. Marking shall be in accordance with applicable drawings
unless otherwise specified in the contract or purchase order.
3.9 Workmanship. Workmanship standards shall be such that the eyepiece
assembly will meet all requirements of this specification and any referenced
specifications or drawings.
3.10 Technical interpretations. The following technical
interpretations, when referenced in sections 3 or 4, are mandatory for this
specification.
3.10.1 Damage. Breakages, loosening, shifting, evidence of corrosion
or failure of any finish, hardware, connection or component; leakage or
condensation of moisture within the eyepiece assembly; or degradation in input
or output characteristics.
3.10.2 "g". "g" is defined as an acceleration or deceleration of 32.17
feet per second per second.
Ambient temperature is defined as +23°C ±
3.10.3
Ambient temperature.
10°C.
3.10.4 Environmental temperature. Environmental chamber temperature
shall be controlled within ±5°C of the specified temperature unless otherwise
specified.
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