MIL-DTL-48550A
3. REQUIREMENTS
3.1 First article. When specified (see 6.2), a sample shall be subjected to first
article inspection in accordance with 4.2.
3.2 Conformance. A sample shall be subject to conformance inspection in
accordance with 4.3.
3.3 Collimator. The item shall conform to drawing 12984644.
3.4 Environmental.
3.4.1 Storage temperature. With fresh batteries installed, the collimator shall be
thermally stabilized at temperatures of -60 ± 5°F and +160 ± 5°F for a period of not less
than 4 hours at each temperature. While thermally stabilized at these temperatures, the
collimator shall be subjected to a visual and tactile inspection and shall not exhibit any
signs of physical failure or damage. Upon return to and stabilization at standard ambient
temperature, +60°F to +90°F, the collimator shall meet the requirements of 3.4.2 through
3.7.12 inclusive.
3.4.2 Operating temperature. With fresh batteries installed, the collimator shall
meet the requirements of 3.7.4 through 3.7.8 inclusive while exposed to and thermally
stabilized at temperatures of +145 ± 5°F and -50 ± 5°F for a period of not less than 4 hours
at each temperature. Upon return to and stabilization at standard ambient temperature,
+60°F to +90°F, the collimator shall meet the requirements of 3.4.3 through 3.7.12
inclusive.
3.4.3 Vibration. The collimator unit shall be vibrated at a constant frequency of 30
cycles per second with an amplitude of 1/16 inch (1/8 inch maximum excursion) for a
period of 5 minutes ± 15 seconds to simulate transportation in a vehicle. Subsequent to
vibration, the collimator shall not exhibit any signs of physical failure or damage and meet
the requirements of 3.4.4 through 3.7.12 inclusive.
3.4.4 Rain. The collimator unit with the cover secured in place and the legs folded
to the carrying position shall be exposed to a simulated rainfall of 4 + 1 inches per hour as
measured at the surface of the equipment for a period of not less than 2 hours. Immediately
following the rain test, neither the interior of the cover nor the collimator shall show
evidence of water penetration.
3.5 Sealing. The collimator unit (telescope) shall be capable of holding dry
nitrogen at a minimum internal pressure of 5 psig for a period of not less than 2 without the
loss of pressure in excess of 0.2 psig for that 2 hour period. The internal pressure of the
telescope shall then be reduced to 0 psig. The telescope shall then be sealed with an
internal pressure of between 0.25 and 0.50 psig of dry nitrogen.
3.6 Optical.
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