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Reticle  accuracy
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Telescope, Panoramic: M137 and M137A1
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Correction counter, excursion ranqe



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MIL-T-48554A(AR)
(lower 6400 mil) counter reading for any one number shall not
exceed 0.25 mil.
3.11.2.2 15 mil steps. Rotating the correction knob to
indicate 15 mils, followed by rotation of the azimuth knob in the
opposite direction with backlash removed, to deflect the line of
sight 15 mils shall cause the azimuth counter to return to within
0.25 mil of trhe  original setting. This requirement shall be met
with the 15 mil value set into each "R" and "L" correction counter
at azimuth positions 3200, 4800, zero, and 1600 mils as read on
the azimuth counter.
3.11.2.3 Level  travel. Starting with the line of sight in
coincidence with a horizontal target, the line of sight shall
track the target within 1.0 mil (total spread of 2 mils when the
head is rotated through two complete revolutions in azimuth.
3.11.2.4 Lift. Vertical displacement of the line of sight
due to reversing rotation by means of the azimuth knob shall not
exceed 0.5 roil.
3.11.2.5 Five mil click lead mechanism. With the lead knob
set for "Direct" fire, a detent action shall be felt and heard
when the azimuth knob-is rotated to introduce increments of 5.0
mils + 0.5 mil into the 6400 mil azimuth counter. This
requirement shall be met at standard and extreme operating
temperatures.
3.11.3 Backlash.
3.11.3.1 Azimuth  mechanism. Backlash in the azimuth
5
mil
as
read
on
the
azimuth
counter
and .75 mil when read on the deflection or bearing counter when
checked at 3200 and 0 mils.
mechanism. Backlash in the elevation
3.11.3.2  Elevation
mechanism shall not exceed 1.0 mil.
3.11.4 Counter
mechanisms.
32.11.4.1 Boresight  retention. An original boresight setting
shall remain within 0.25 mil, as read on the azimuth counter,
subsequent to rapid traverse specified in 3.11.4.2.
3.11.4.2  Rapid  traverse. With the correction counter
indicating zero, the deflection or bearing counter shall follow
the azimuth counter within 0.25 mil with the azimuth knob is
rotated at 140 + 10 rpm for 30 seconds + 5 seconds in each
direction, excluding backlash. The correction counter shall
remain at zero.
3.11.4.3 Deflection or bearing counter. The counter shall
7

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