MIL-DTL-48554B
3.9.5 Five mil click lead mechanism. With the five mil click lead actuator on the
azimuth knob set to "Direct", 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 azimuth counter. This input
shall also cause a deflection in the line of sight of 5.0 mils ± 0.5 mils. These requirements
shall be met at standard ambient temperature and the extreme operating temperatures
specified in paragraph 3.3.2.
3.10 Backlash.
3.10.1 Azimuth mechanism. Backlash in the azimuth mechanism shall not be
greater than .5 mil as read on the azimuth counter and .75 mil as read on the deflection or
bearing counter when checked at 3200 and zero mils.
3.10.2 Elevation mechanism. Backlash in the elevation mechanism shall not be
greater than 1.0 mil.
3.11 Counter mechanism.
3.11.1 Rapid boresight retention. With the correction counter indicating zero and
subsequent to the azimuth knob being rotated at 140 ± 10 rpm for one full revolution of the
head (with backlash removed): the deflection or bearing counter shall follow the azimuth
counter within ±0.25 mil, original boresight setting shall remain within ±0.25 mil as read
on the azimuth counter, and the correction counter shall remain zero.
3.11.2 Deflection or bearing counter. The deflection or bearing counter shall be
settable to any reading from 0 to 6399 within ± 0.25 mil.
3.11.3 Correction counter, excursion range. The correction counter shall have a
minimum of 95 mils excursion, but not over 99 mils excursion, for both the "L" and "R"
directions.
3.11.4 Correction counter setting affect on deflection or bearing counter. Setting
L95 on the correction counter and re-establishing the line of sight on the collimator target
reticle within 0.1 mils using the azimuth knob, with the backlash removed, shall increase
the deflection or bearing counter reading 95 ± 0.5 mils. Setting R95 on the correction
counter and re-establishing the line of sight on the collimator target reticle within 0.1 mils,
with the backlash removed, shall decrease the deflection or bearing counter reading 95 ±
0.5 mils.
3.11.5 Correction counter setting. There shall be no change greater than 5 mils in
the azimuth counter readings in the applicable direction when the 95 mil values are set into
the correction counters. There shall be no change greater than 0.25 mil in the azimuth
counter reading when the 95 mil values are set into the correction counter and the line of
sight is re-established on the collimator target reticle within 0.1 mils using the azimuth
knob, with the backlash removed.
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