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Deflection error, backlash and 15 mil settings |
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|  MIL-T-46386A(MU)
4.7.2.2.2 Deflection error, backlash and 15 mil settings. - With
the panoramic telescope positioned as outlined in 4.7.1 rotate the azimuth
fixture plate 800 mils. Sight through the panoramic telescope and rotate
the azimuth knob in the opposite direction until the line of sight falls
in coincidence with the position outlined in 4.7.2.1.2. DO not override
this point of coincidence. Record deflection counter reading and resett
counter reading.Both should be in conformance with 3.7.6.1. Rotate the
deflection knob one complete revolution and retrun the line of sight to
the previously established position and observe deflection and reset counter
readings. This difference, if any, is backlash and shall not exceed the
limits of 3.7.6.3. Rotate the azimuth plate an additional 15 mils and
repeat above procedure. When coincidence is obtained observe deflection
and reset counter readinngs. Coincidence must conform to the limits outlined
in 3.6.7.2. Repeat the 15 mil check after each 800 mil setting.
4.7.2.2.3 Level travel. - This test may be performed in conjunction
with the deflection test outlined in 4.7.2.2.2. The test is performed by
sighting through the panoramic telescope after a selected azimuth setting
has been inserted into the fixture and panoramic telescope, observe
coincidence between the telescope horizontal reticle line and the
horizontal target line near the optical axis. They must coincide within
the limits outlined in 3.7.5.
4.7.2.2.4 Lift. - This test may be performed in conjunction with the
backlash test outlined in 4.7.2.2.2. The test is performed after return-
ing the line of sight to the point of coincidence by observing where the
horizontal reticle line of the panoramic telescope falls with respect to
the previously established position (4.7.2.2.3). They must coincide with-
in the limits of 3.7.5.1.
4.7.2.2.5 Five mil click mechanism. - This test may be performed by
using visual and tactile inspection techniques. The result of this
inspection shall conform to the requirement outlined in 3.8.2.7 when
performed at the temperature specified.
4.7.2.2.6 Rapid traverse (reset counter). - This test is made by assembling
a testing mechanism capable of providing an RPM output specified in 3.8.1
to the azimuth knob of the panoramic telescope by means of an appropriate
adapter. After subjecting the panoramic telescope to the RPM for the
time specified, the reset counter and the azimuth counter shall follow
as required in 3.8.1 and the reset counter shall reset to 3200 mils at
the end of each speed test required in 3.8.1. The gunner's aid counter
shall remain as specified in 3.8.1.
4.7.2.2.7 Resolution. - This test may be performed after directing
the line of sight toward a target similar to that specified in MIL-O-13830.
The actual test is performed as outlined in MIL-O-13830. Observe the
definition pattern on the target. The patterns must be resolved in the
four meridians within the limits outlined in 3.7.8.
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