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|  MIL-M-48557A(AR)
3.8.7 Backlash (cross level). Backlash shall not exceed
1.5 mils at zero elevation and zero cant.
3.8.8 Mount rigidity. A line of sight shall be
established at zero elevation and zero cant. Apply a twenty
pound horizontal tangential load at the right side of the
telescope support at 2.3 inches form center line of the
support. Apply the same load at the left side of the telescope
support. Release the load and record the movement. The total
movement as indicated by the two readings shall not exceed the
following values at the specified elevation settings:
TOTAL MOVEMENT
CANT ANGLE
ELEVATION
(In Mils)
(In Mils)
(In Mils)
.25
0
o
.75
0
800
1.75
0
1100
3.50
0
1333
3.8.9 Azimuth correction. The mount shall make left and
right azimuth corrections in accordance with the following
requirements and values:
AZIMUTH CORRECTION
TOLERANCE
AZIMUTH CORRECTION
CANT ANGLE
ELEVATION
..
(In Mils]
(in Mils)
(In Mils)
(In Mils)
.3
27.0
88.9
300
59.6
88.9
600
1.5
108.8
88.9
900
1.8
216.8
88.9
1200
.6
54.5
177.8
300
1.0
120.3
177.8
600
2.0
342.4
177.8
1100
3.9
Illumination.
3.9.1 Level vial illumination. The level vial bubbles and
graduation lines shall be clearly distinguishable when observed
in ambient light conditions ranging from dusk into darkness.
3.10 Torque. The running torque required to operate the
following knobs shall be within the values specified for
standard ambient. temperature of +60 to +90, and shall not
exceed the values specified for extreme operating temperature.
6
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