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Extreme operating temperatures. |
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|  MIL-M-60170A(MU)
inclusive. The power supply shall be capable of being positioned
external to the temperature cycling chambers while energizing the
circuitry of the mount under test.
4.5.2.3.4 Set-up and calibration.- Rigidity, stability, ease of
maintenance, and adaptability of set-up and calibration equipment with
complete provisions are also prime requirements. All set-up and cali-
bration equipment necessary for certification of the testing equipment
accuracy shall be furnished and will become a part of the testing equip-
ment.
4.6 Test methods and procedures.
4.6.1 Storage temperatures.- Testing equipment utilized in this
test shall be in accordance with the "Test Facilities" requirements of
MIL-F-13926 and the conditions of 3.3.1. The mount assembly shall be
exposed to each specified temperature extreme for a minimum of 5 hours.
Subsequent to the-temperature exposures, the mount assembly shall be
stabilized in an ambient temperature between +60 and +90F and subjected
to the audible, tactile, and visual examination of 4.6.4.1. The mount
shall show no evidence of physical failure as specified in 3.3.1. The
mount shall then be subjected to the tests specified in 4.6.3 through
4.6.10 inclusive to determine overall compliance with 3.3.1.
4.6.2 Extreme operating temperatures.- Testing equipment utilized
in this test shall be in accordance with the "Test Facilities" require-
ments of MIL-F-13926 and the conditions of 3.3.2. The mount assembly
shall be exposed to each temperature extreme specified in 3.3.2 for a
minimum of 5 hours. At the end of each 5 hour period, and while still
at the temperature extreme, the mount assembly shall be subjected to
the tests specified in 4.6.4.1 through 4.6.9.5 inclusive. The mount
assembly shall conform to the operability requirements of 3.3.2 for each
temperature extreme.
4.6.3 Rigidity, pre-vibration.- Prior to the vibration test, posi-
tion the mount as specified in 3.4 utilizing testing equipment conforming
to 4.5.2.3.2.1 and 4.5.2.3.2.2. Install the body assembly device
(4.5.2.3.2.3) in the mount. View through the telescope and establish
coincidence of the real and reflected images of the telescope reticle
lines. Record the readings of the telescope micrometer knobs for use
in the post-vibration test. Subsequent to recording the pre-vibration
line of sight setting of the telescope, remove the mounting plate
assembly (with the body assembly device installed) from the line of
sight test stand, and position it on the vibration test stand (4.5.2.3.2.4).
Subject the mount to the test in 4.6.4. Caution must be exercised during
this transfer of the mounting plate assembly. All unnecessary shocks
which would tend to render the testing equipment inaccurate for subsequent
tests shall be avoided,
4.6.4 vibration.- Perform this test with the mounting plate assembly
and mount with body assembly device installed, positioned on testing
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