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|  MIL-T-50382(MU)
3.7.9 Parallax. - Parallax in the center of the field shall not
exceed 0.35 mil when viewing a target between 40 meters and infinity.
(Parallax is nominally zero at 80 meters.)
3.7.10 Reticle accuracy. - The total angular subtense of the reticle
graduations in object space shall be as indicated on the reticle drawing
within two percent.
3.8 Counter operation.
3.8.1 Reset counter. - The reset counter shall be resettable to 3200
mils from any counter reading. The reset counter and the 6400 mil azimuth
counter shall follow when the operating knob is turned at the rate of 200
revolutions per minute (RPM) for a period of one minute. The gunner's
aid counter shall remain at R-00 and L-00.
3.8.2 Gunner's aid counter. - The stops shall allow an excursion of
plus 50 mils and minus 50 mils
3.8.2.1 Counter setting. - Setting right (R) 50 mils on the gunner's
aid counter shall increase the reset counter by 50 mils. Setting left (L)
50 mils on the gunner's aid counter shall decrease the reset counter by
SO mils No change shall result in the 6400 mil azimuth counter.
3.8.2.2 Direct fire, click lead, engagement knob. - With the detent
on the knob of the 6400 mil azimuth counter Set for direct fire the azimuth
counter knob shall indicate a distinguishable click, indicating detent
position at each five mil internal between 0 and 6400 mils
3.9 Operability of movable Parts.
9
3.9.1 Torque. -The running torque required to rotate the following
components shall be within the values tabulated. When checked at the
temperature specified in 3.4.2, the running torque values shall not exceed
the value obtained at standard ambient temperature by more than 150%.
Elbow Assembly
not to exceed 12 inch pounds
Elevation Knob
5 to 48 inch ounces
Reset Counter (rotation
2 to 40 inch ounces
to reset counter)
Azimuth Knob
4 to 10 inch pounds
Boresight Adjustment
2 to 20 inch ounces
(rotation while clutch
is disengaged)
3.9.2 Operability. - This requirement shall be met with the telescope
thermally stabilized at the temperatures specified in 3.4.2. The reset
counter knob shall be manually operable to push in for resetting counters
(direct force). The boresight adjustment shall be operable to disengage
the clutch for boresighting (direct force). The azimuth counter cover
5
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