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Drive train torque and backlash test. |
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|  MIL-R-50746(MU)
8 August 1973
4.6.21 Image wander test. This test shall be conducted
in conjuction with the test in 4.6.20. While observing the established
position (intersecting point) of the auxiliary telescope reticle, rotate
the elevation scan control of the rangefinder as specified in 3.3.1.20.
Observe the image wander of the target as a result of elevatioa and
depression to determine compliance with 3.3.1.20.
4.6.22 Drive train torque and backlash test.
4.6.22.1 Azimuth test.Apply starting torque to the azimuth
positioning shaft the receiver-transmitter control. Monitor the
movement of the scan prism (optically or mechanically). Verify that
the requirement. bf 3.3.4.21.1. are met.
4.6.22.2 Elevation test. Apply starting torque to the. elevation
positioning shaft of the receiver-transmitter control. Monitor the
movement of the scan prism (optically or mechanically). Verify
that. the requirements of 3. 3. 1.21.2 are met,
4.6.23 Environmental test.
4.6.23.1 Temperature test. The test appaaatus shall be
in accordance with the applicable test facilities provisions of
MIL-F-13926 except that the unit may be mounted on the inside surface
of the test chamber. Perform this test in accordance with Procedure
I of MIL-F-13926, with conditions C (-40 F) and E (+ 125 F), and
with the rate of temperature change during cycling not greater than
8F per minute. At each of the specified operating temperatures,
perform the tests of 4.6.4 through 4.6.16.2, except 4.6.3, 4.6.10,
4.6.11, 4.6.13, and 4.6.15 to determine compliance with 3.3.2.2. At
ambient temperature, perform the tests of 4.6.2 through 4.6.22, except
4.6.14.2, to determine compliance with 3.3.2.1 and 3.3.2.2.
4.6.23.2 Vibration test.
4.6.23.2.1 Vibration "A" test. Perform this. test utilizing
the apparatus specified in Method 514.1 of MIL-STD-810 and in
accordance with Procedure VIII therein, except that the vibratory con-
ditions of 3.3. 2.3.1 shall apply. After vibration exposure examine the
unit for structural failures, Loose hardware, wire breakage, abrasion
and contamination of optical components. Perform the tests of 4.6.3
through 4.6.22, except 4.6.16.2, to determine compliance with 3.3.2.3.1.
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