MIL-DTL-48550A
4.6.5 Reticle illumination. Perform test under daylight conditions with the rear
cover of the collimator in an open position. Position a four power telescope at a distance of
15 feet + 6 inches and then at 48 feet 6 inches from the objective lens of the collimator.
At both positions, view the collimator reticle through the telescope for compliance with the
requirements of 3.6.5. Repeat the above test in a completely darkened area with the rear
cover closed, fresh batteries installed, and the light switched on.
4.6.6 Collimated light output. Perform this test by using a focusing photometer
capable of producing readings in the microlamberts (10-3 footlamberts) range. The
photometer shall have an accuracy of ±4% and be capable of repeating to better than
±0.5%. The light output shall be performed by directing the photometer toward the
supported item and separated at the specified working distance. The item under test shall
be supported by an appropriate medium having a black background. Align and focus the
receiving aperture of the photometer so that it covers no more than one half of the smallest
dimension on the radiating surface of the item under test and is centered on the surface.
The radiating surface must also be perpendicular to the line of sight of the photometer. The
measurement in microlamberts shall be equal to or exceed the minimum value specified.
Perform this test in a dark room.
4.7 Mechanical.
4.7.1 Elevation travel. The elevation travel test shall be made by means of a wall
chart located a suitable distance from the collimator. The chart shall have a plumbed line
with a mark for the line of sight of the collimator and marks located 800 mils above and
below the collimator line of sight mark. With legs fully extended in a horizontal position
and the elevation clamping mechanism released, the collimator shall be elevated and
depressed through the entire excursion indicated. Sighting of the collimator shall be
accomplished by means of the open sight located on the collimator and shall meet the
minimum requirements specified in 3.7.1.
4.7.2 Azimuth travel. This test shall be made with the wall chart specified in 4.7.1.
Sighting of the collimator shall be accomplished by means of the open sight located on the
collimator. With open sight aligned with the plumbed line and the azimuth clamping
mechanism released, the collimator shall be rotated 6400 mils and shall meet the
requirements of 3.7.2.
4.7.3 Open sight. This test shall be accomplished with the aid of an auxiliary
telescope and a calibrated target. The center of the calibrated target shall be coincident
with the optical line of sight of the auxiliary telescope and shall contain a 1 degree radius
circle, the center of which shall represent the center of the open sight of the collimator.
With the collimator positioned in front of the auxiliary telescope as specified in 4.6.1 and
the calibrated target located to the rear of the auxiliary telescope, the open sight shall read
within the limits of the circle in compliance with the requirements of 3.7.3.
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