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Drive train torque and backlash test% |
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|  MIL-R-50749(MU)
8 August 1973
4.6,22 Battery low indicator test. Set the LASER MODE
CONTROL switch to the ON or TEST position. Connect A77J5-E to
A77J5-e. Observe the battery low indicator to determine compliance
with 3.3.1.21.
4.6.23 Drive train torque and backlash test%
N O T E : The tests in 4.6.23.1 and 4.6.23.2 may be performed
at the unit level or only with the receiver-transmitter
and receiver-transmitter control.
4.6.23. 1 Azimuth test. Apply starting torque to the azimuth
positioning knob of the receiver transmitter control. Monitor the move-
ment of the scan prism (optically or mechanically). Verify that the
requirements of 3. 3.1.22.2 are met,
4.6.23.2 Elevation test. Apply starting torque to the elevation
positioning knob of the receiver-transmitter control. Monitor the move-
ment of the scan prism (optically or mechanically). Verify that the
requirements of 3. 3.1.22.2 are met.
4.6.24 PFN discharge time test. Connect a microammeter be.
tween pins t(+) and e(-) on test access connector J5 on the laser Power
Supply Control (1 1738831). Remove the power source (item 1.1 of table "
II) by setting the LASER MODE CONTROL switch to the OFF position.
Measure the PFN current decrease to determine comliance with 3.3.1.23.
4.6.25 Environmental tests.
NOTE: Environmental testing of the separate components, assem-
blies, and units,including sparea, of the fire control range-
finder shall not be required when the range finder is tested
as a fire control rangefinder subsystem as specified herein.
4.6.25. 1 Temperature tests. The test apparatus shall be in
accordance with the applicable test facilities provisions of MIL-F-I3926.
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except that assemblies `or units may be mounted on the inside surface of
the test chamber. Perform this test in accordance with Procedure I of
o
MIL-F-13926, with conditions C (-40" F) and E (+125 F) with an additional
operating condition at -20 F, and with the rate of temperature change
during cycling greater than 8 Fo per minute. Perform the tests of
4.6.4, 4.6.7.3, and 4. 6.9 at -40 F and +125F, and the test of 4.6.7.6b
at -20F to determine compliance with 3.3.2.2. Perform the tests of
4.6.4, 4.6.7.2, 4.6.9, and 4.6.16 through 4.6.24 at ambient temperature
after exposure to and thermal stabilization at -80" F and +160 F to deter-
mine compliance with 3.3.2.1.
4. 6.25.2 Vibration "A" test. , Perform this test utilizing the ap-
paratus sepecified in Method 514.1 of MIL-STD-810 and in accordance with
Procedure VIII therein except the vibratory condition of 3. 3.2.3
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