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MIL-T-62222(AT)
3.5.3.6.2 Rangefinder calibration.
3.5.3.6.2.1 Rangefinder settings. Each rangefinder shall be checked within 72 hours prior to
installation in the turret. With the range scale set to 1200 meters, the calibration reticles
positioned in accordance with figure 3, the 1200 meter target image in coincidence, and the
rangefinder temperature stabilized at 80F, plus or minus 20F, the following requirements shall
be met (see 4.6.17.3.6.2.1).
NOTE: Rangefinder temperature shall be considered stabilized after four hours at any given
temperature plus or minus 5F within the 60 to l00F range.
a. Horizontal calibration knob. The setting of the horizontal calibration knob shall be
within 40 units of error (UOE) of the midpoint of total travel.
b. Vertical calibration knob. The setting of the vertical calibration knob shall be within
180 degrees of midpoint of total travel.
c. Internal correction scale knob. The setting of the internal correction scale (ICS) knob
shall be within 13 UOE of the mid-position "(25)".
3.5.3.6.2.2 Final rangefinder calibration settings. With the rangefinder installed in turret and
turret installed on vehicle, the rangefinder settings shall be checked to a maximum range target
of 1000 to 2000 meters (see 4.6.17.3.6.2.2).
a. Horizontal calibration knob. The setting of the horizontal calibration knob shall be
within 80 UOE (graduations) of the midpoint of total travel.
b. Vertical calibration knob. The setting of the vertical calibration knob shall be within
360 degrees of midpoint of total travel.
c. ICS knob. The setting of the ICS knob shall be within 20 UOE by the midpositions
"(25)".
3.5.3.6.3 Superelevation. The superelevation as measured at the gun shall meet the
requirements of table VIII with the tolerances specified in table IX when data is transmitted
automatically by positioning the rangefinder range scale at any specific range. The mil output as
a result of the rotation of the ballistic output shaft shall be as specified in table IX
(see 4.6.17.3.6.3).
3.5.3.6.4 Indirect fire control.
3.5.3.6.4.1 Elevation quadrant. At zero gun elevation and with the bubble centered in the
level vial, the knob scale and the index scale shall be adjusted to read zero. The reading on the
elevation quadrant shall correspond to the position of the gun within plus or minus 1 mil at all
angles of elevation and depression (see 4.6.17.3.6.4.1).
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