MIL-DTL-48554B
compare it with the reticle of the dioptometer. Adjust the barrel of the dioptometer to make
the reticle of the telescope go out of focus; then re-adjust the barrel to bring the telescope
reticle into focus at the sharpest point. Read the value on the scale on the barrel of the
dioptometer, this number shall not be greater than the limits of 3.7.1. Repeat procedure for
horizontal and vertical image individually, the difference between the two shall not be
greater than the limits of 3.7.1.
4.6.2 Parallax. With the telescope mounted on the 10558252 test fixture, and the
collimator projector set to a range of 80 ± 10 meters, turn the azimuth knob until telescope
reticle is coincident with the target reticle. Observe any apparent movement between the
telescope and target reticles as the observers head is moved up and down and from side to
side within the limits of view imposed by the telescope eyeshield. The apparent motion
shall not be greater than the limits of paragraph 3.7.2.
4.6.3 Reticle accuracy. With the telescope oriented as described in paragraph 4.4
adjust the fixture rotary table so that the right 40 mil mark of the telescope is coincident
with the target centerline. Read the azimuth counter. Rotate the azimuth knob until the left
40 mil mark is coincident with the target centerline. Reread the azimuth counter. The
difference in counter readings is the angular separation between 40 mil graduations and
shall be within the limits of paragraph 3.7.3.
4.6.4 Resolution. Place viewing telescope 7680631 in front of the panoramic
telescope's eyepiece. The wall target and testing procedures for resolution shall be in
accordance with MIL-PRF-13830, paragraph "Resolution test." The telescope shall not be
greater than the limits specified in 3.7.4.
4.6.5 Parallelism of reticle and image. When oriented per paragraph 4.4, using
collimator reticle 9329535, the azimuth and elevation knobs shall be used to position the
intersection of the vertical and horizontal reticle line of the telescope so that it passes
through the intersection of the vertical target line and the short horizontal mark on the
target reticle (about 20 mils below its center cross). When so positioned, the telescope
vertical reticle line shall lie within the 30 minute limit lines of the target reticle to display
conformance with paragraph 3.7.5. This test shall also be repeated with the elbow
positioned against the right and left swing stops and at azimuth settings of 3200 mils, 4800
mils, 0000 mils and 1600 mils.
4.6.6 Image tilt. The telescope shall be orientated in accordance with 4.4, using
collimator reticle 9329535. Use viewing telescope 5549108 and a flat surface to position
the viewing telescope at the eyepiece of the telescope under test, adjust the viewing
telescope to the height of the telescope eyepiece. Adjust the viewing telescope's position
so that the vertical reticle line is in coincidence with the target vertical reticle line at the
short horizontal mark (about 20 mils below the center cross). The vertical target line shall
be parallel to the vertical line of the viewing telescope within the limits of the 1 degree
mark of the target telescope per 3.7.6. This test shall be repeated with the elbow positioned
against the right and left swing stops and twice at each of the azimuth settings of 3200 mils,
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