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Page Title:
Final rangefinder calibration settings |
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|  MIL-T-62222(AT)
g. The boresight knob (excluding boresight knob backlash) of each sighting instrument
shall be used, if necessary, to reposition their reticles on the original aiming point.
Any loss of boresight retention shall be noted by the new boresight knob position and
shall not exceed the limits specified.
4.6.17.3.6.2 Rangefinder calibration.
4.6.17.3.6.2.1 Rangefinder settings. To determine conformance to 3.5.3.6.2.1, the
rangefinder shall be mounted on a Government approved final inspection fixture and checked
prior to installation in the turret.
4.6.17.3.6.2.2 Final rangefinder calibration settings. To determine conformance to
3.5.3.6.2.2, the rangefinder mounted in the turret and the turret installed on the vehicle,
rangefinder calibration shall be checked in accordance with the following procedure:
a. A clearly defined target shall be provided between 1000 and 2000 meters located
within an accuracy of 1/3 of 1 percent and the range scale set to agree with the range
chosen.
b. Set the occluder knob to its midposition.
c. With the eyepiece in proper focus for the observer, coincidence shall be established
with the target by means of the horizontal and vertical calibrating knob.
d. The calibrating reticle shall be illuminated. The calibrating reticle lamp shall not be
left on for more than one minute at any one time. If it is necessary to turn on the
reticle lamps again, allow at least two minutes off after the third check. Alignment of
the coincidence reticle shall be established (see figure 3) using the cover protected
ICS and halving knobs.
e. The horizontal, vertical, and ICS knob setting shall be that specified.
4.6.17.3.6.3 Superelevation. To determine conformance to 3.5.3.6.3, the superelevation of
the gun sighting system shall be checked in accordance with the following procedures and
observed for accuracy of sighting:
a. With the ballistic computer switch at the rangefinder turned off, the computer range
correction knob and superelevation counter shall be set at zero.
b. If a mil scale on a target is to be used to read gun superelevation, the gun shall be
aligned with the horizontal gun aiming point by laying low to high. The mil scale
shall be fixed to the target with the zero index at the horizontal gun aiming point. If
the gunner's quadrant M1Al is to be used to measure gun superelevation, the gun
shall be leveled by means of a M1Al gunner's quadrant positioned on the breech ring
pads.
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