MIL-PRF-49063E
3.6
Performance Characteristics.
3.6.1 Sight definition. For conformance to the following performance
parameters, the sight is defined as sight less case, bag and ancillary
equipment.
3.6.2 Eyeguard operation. With the eyeguard vertical and at -48°C, the
eyeguard shall open (depress) when a 2000, ± 10 gram weight is placed axially
on the eye flange and shall close (expand) when the weight is reduced to 100,
± 10 grams. At +23°C, the eyeguard shall open (depress) when a 1600, ± 10
gram weight is placed axially on the eye flange and shall close (expand) when
the weight is reduced to 100, ± 10 grams. At +23°C and with the eyeguard open
(depressed) the minimum open position of the 2 leaves shall be 1.875 inches.
3.6.3 Resolution. The minimum sight resolution shall be within one
element number of the resolution of the image intensifier used in the sight at
the time of testing while using a USAF 1951 Resolving Power Test Target with
the target brightness adjusted to achieve best contrast.
3.6.4 Field of View.
The sight shall have a minimum field of view of
253 milliradians.
3.6.5 Weight. The weight of sight with BA-5567/U battery but without
daylight cover shall not exceed 4.0 pounds.
3.6.6 Controls and adjustments. All controls and adjustments shall
operate smoothly without binding throughout their complete range of movement
at all operating temperatures specified herein.
3.6.6.1 Eyepiece diopter focus. With the diopter adjustment control
set at -6 (+ 1/4, -0.0) to +2 diopter, the image of the projected reticle
shall be in sharp focus.
3.6.6.2 Range focus. The sight shall provide a minimum focus
adjustment range from a near focus of 25 meters to infinity. The dynamic
torque to turn the range focus control shall be 8 ± 7 inch-pounds.
3.6.6.3 Tube brightness control. The tube brightness control shall
vary the gain of the image intensifier tube from OFF to maximum gain.
3.6.6.4 Reticle brightness control. Brightness of the reticle pattern
shall be continuously variable over the range from OFF to full brightness.
The pattern shall be visible and the numbers legible when viewing a solid
white target having a brightness of 3.3 x 1O-3 footlamberts minimum.
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