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Post environmental temperature checks |
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|  MIL-c-46344A(MU)
4.6.1.3 Post environmental temperature checks.- Following temperature
environmental tests, the computer shall be thermally stabilized at room
temperature (60 to 90F) and tested for the following to determine com-
pliance with 3.4.2.1:
(a) The tests of 4.6.2.3 and 4.6.2.9
(b) With the required load applied to the output shaft and
at the specified voltage, the computer shall be tested in accordance with
4.6.2.8.
4.6.1.4 Sealing (water resistance). - This test shall be conducted
in accordance with Procedure I of MIL-F-13926 to determine compliance with
3.4.4. The computer shall show no evidence of water penetration as a
result of this test. The receptacle shall be covered with waterproof tape
during this test. The computers that are opened for environmental drying
and examination for water penetration shall be resealed to meet the require-
ments of the drawings prior to submission for final acceptance.
4.6.1.5 Vibration. - Standard vibrating equipment capable of providing
the amplitude and frequency specified in 3.4 shall be utilized for the
vibration test. Unless otherwise specified, the test equipment shall be
in conformance with the "Test Facilities" requirements of MIL-F-13926.
Position the computer on the vibration table in accordance with the require-
ments of 3.4.3. The computer shall be vibrated in a vertical plane for
a period of 5 minutes 15 seconds.
4.6.1.5.1 Post vibration, physical failure. - Following vibration,
the computer shall be subjected to a visual and tactile examination for
damage such as loose, bent or broken parts, et. to determine compliance
with 3.4.3.1. The computer shall then be subjected to all the following
tests of this specification.
4.6.2 Output calibration.
4.6.2.1 Zero reference.- The 1200 meter checkpoint as determined
previously by the manufacturer shall be visually checked for compliance
with 3.5.1.1. It shall be indicated by an index line inscribed on the
input shaft in coincidence with an index on the input shaft seal plate
cover.
4.6.2.2 The following tests shall be conducted using Test Fixture
A8565930 and in accordance with the operating instructions specified on
Drawing D8258567 using appropriate metric scales. The computer input
shaft and the fixture input mechanism shall be oriented to the 1200
meter checkpoint.
4.6.2.3 1200 meter checkpoint.- Set the ammunition selector on the
cam specified and the range correction knob on zero. When the mil value
specified in Table I is indicated on the computer superelevation mil
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