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|  MIL-T-60895(MU)
4.7.2.2 Counter operation.
4.7.2.2.1 Gunner aid counters. - This test may be accomplished with
the panoramic telescope positioned as outlined in 4.7.1 sith the line of
sight falling upon the projector collimators' reticle as outlined in
4.7.2.1.2. Observe and record the azimuth test fixture reading. Set any
correction reading into either the "L" or "R" counter, Any reading induced
into the right "R" gunner's aid counter shall increase the reset counter
and equal amount and any reading induced into the left "L" gunner's aid
counter shall decrease the reset counter and equal amount to assure compli-
ance with 3.8.3.3.2. When 50 mils has been inserted into either gunner's
aid counter, the reset counter shall reflect an increase or decrease of
50 mils within the limits outlined in 3.8.3.3.2 and the correction counter
shall have traveled the minimum excursion outlined in 3.8.3.3.1 and the
6400 mil counter shall remain unchanged (see 3.8.3.3.2). The test for
accuracy shall be performed by inserting a correction into either the "L"
or "R" gunner's aid counter and observing the appropriate change in the
reset counter. Turn the azimuth fixture plate to traverse the line of
sight in a clockwise direction an equal amount when a correction is placed
intyo the "L" counter. By means of the azimuth knob of the panoramic tele-
scope traverse the line of sight in the opposite direction until the reset
counter records 3200 mils. Now sighting through the panoramic telescope
and observe coincidence between the panoramic telescopes optical axis and
the point on the projector collimators reticle established in 4.7.2.1.2.
This coincidence must be maintained within the limits specified in 3.8.3.3.2.
Repeat this procedure at two additional correction readings and at the
50 mil correction setting of each gunner's aid counter.
4.7.2.2.2 Azimuth error. backlash and deflection error.- With the
panoramic telescope positioned as outlined in 4.7.2.1, sight through the
panoramic telescope and by means of the azimuth and elevation knobs coincide
the telescope's line of sight (intersecting point of the horizontal and
vertical center reticle lines) to the geometric axis of the collimator pro-
jector (intersecting point of the horizontal and vertical center reticle
lines). Observe that the azimuth counter reads 0000 (Black), the reset counter
reads 3200 mils and both gunners aid counters read 0 mils. Set the azimuth fix
ture off 800 mils in one direction and offset the panoramic telescope's line of
sight in the opposite direction until coincidence previously mentioned has been
obtained. Do not override this point of coincidence. Record the reset and counter
readings. Continue rotating the azimuth knob (panoramic telescope) beyond
this point of coincidence one revolution and return to the previous point
of coincedence. Observe reset and azimuth counter readings. The azimuth
counter and the fixture reading must coincide within the limits of 3.8.2.1.
The difference between this reading and the azimuth counter reading
previously recorded must not exceed the limits of 3.8.2.3. The difference
between this reset counter reading and the previously recorded reset
counter reading must not exceed the limits of 3.8.2.3. Repeat this pro-
cedure at the azimuth setting specified in 3.8.2.1 and also from the
opposite direction. Insert 15 mils deflection into the azimuth fixture and
I
insert 15 mils correction into the appropriate correction counter. The
13.
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