MIL-PRF-49148D(CR)
3.6.2
Vibration. The objective lens 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 within 15 minutes in the vertical axis only.
Vibration shall be performed from 5.0 to 5.5 Hz. at 1-inch displacement, 5.5
to 30 Hz. at 1.5 g's peak, 30 to 50 Hz at 0.33-inch displacement and 50 to 500
Hz. at 4.2 g's peak.
3.6.3
Shock.
3.6.3.1 Basic shock. The objective lens shall not be damaged nor
suffer degradation of performance (see 3.10.1 and 3.10.4) after being
subjected to basic shock of 40 g's (see 3.10.5) at 18 milliseconds.
3.6.3.2 Weapon shock. The objective lens shall not be damaged nor
suffer degradation of performance (see 3.10.1 and 3.10.4) after being
subjected to simulated weapon firing shock of 100 g's at 1.5 milliseconds one
half sine pulse.
3.6.4 Immersion.
The objective lens 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 objective lens shall be pre-
to temperature of +45°C ±3°C for a period of 2 hours
conditioned by exposure
in the fresh water at a temperature of +18°C ±5°C.
prior to being immersed
3.7 Treatment and painting. Treatment and painting shall be anti-
reflective, shall be rust resistant and as specified on applicable drawings
unless otherwise specified in the contract or purchase order.
3.8 Marking. Marking shall be in accordance with applicable drawings
unless otherwise specified in the contract or purchase order.
3.9 Workmanship. Standards of workmanship shall be such that the
objective lens will meet all requirements of this specification and any
referenced specifications or drawings.
3.10 Technical interpretations. The following technical interpretations
are, when referenced in sections 3 or 4, mandatory for this specification.
3.10.1 Damage. Damage is defined as any breakage, loosening, shift,
dents, failure of any finish, hardware, connection, or component, or
condensation, fogging or moisture on any internal surface.
Ambient temperature is defined as +23°C,
3.10.2
Ambient temperature.
± 10°C.
3.10.3 Environmental temperature. Environmental chamber temperature
shall be controlled to within ±5°C of the specified temperature unless
otherwise specified.
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