MIL-DTL-48554 Telescope, Panoramic - M137A2, M137A3, And M137A4This specification covers Telescope, Panoramic ?√ M137A2, M137A3, and M137A4 which are types of panoramic telescopes which provide four-power magnification and a ten-degree field of view. They are equipped with numerical counters which indicate azimuth settings and corrections.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22

MIL-DTL-48554B

FIGURE 3. Excursion range and plumb travel target.

4.8 Azimuth mechanism.

4.8.1 800 mil steps (azimuth). Position the telescope as specified in 4.4. Rotate the

azimuth knob until an additional 800 mils is read on the azimuth counter. Rotate the test

fixture 800 mils. Record the difference in movement as read on the target reticle. Repeat

readings through two revolutions of the head in one direction. Repeat in the opposite

direction without resetting. The error in the readings taken shall not be greater than the

tolerance specified in 3.9.1.

4.8.2 15 mil steps (azimuth). Position the telescope as specified in 4.4. Rotate the

correction knob to indicate "R-15". Rotate the azimuth knob, with backlash removed, to

deflect the line of sight 15 mils in the opposite direction as read on the collimator target

reticle. The deflection counter reading shall return to the original setting within the

requirements of 3.9.2. This test shall be repeated with the correction counter indicating "L-

15".