MIL-DTL-25971C
3.5.3 Focus. When tested as specified in 4.4.4, the center of the image as shown on
figure 1 shall have the same spacing as the holes in the screen.
B
A
4 1/2 FT
C TO BE HORIZONTAL
L
A
B
HOLES
IMAGES
1
2
1
2
4
4
4
4
3
3
4
4
A-A
SECTION
B-B
SECTION
Unless otherwise specified, dimensions in inches.
FIGURE 1. Focus test.
3.5.4 Photometry. When tested as specified in 4.4.5, the signal beam emitted from the
light shall be of a circular cross section. The spread of the beam in any plane through the axis
shall be not less than 1/2 degree at 180,000 candelas when the specified lamp is operated at 90
spherical candelas without a color filter but with the clear cover in place. The spread of the
beam shall not exceed 2 degrees at 50,000 candelas. The filter colors shall meet the
requirements of 3.4.1.5.
3.5.5 High temperature. When tested as specified in 4.4.6.1, there shall be no evidence
of damage and the light shall operate satisfactorily at the conclusion of the test.
3.5.6 Low temperature. When tested as specified in 4.4.6.2, there shall be no evidence
of damage and the light shall operate satisfactorily at the conclusion of the test.
3.5.7 Humidity. When tested as specified in 4.4.6.3, there shall be no evidence of
damage and the light shall operate satisfactorily at the conclusion of the test.
7
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