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|  MIL-C-70489(AR)
4.5.2.3.2 Fabrication, setup and calibration. Design and
fabrication of test equipment Shall be Such that it incorporates
the features of rigidity, stability, and ease of maintenance.
Setup and calibration equipment necessary for Certification Of the
testing equipment accuracy shall be furnished and will become a
part of the testing equipment. Operating and calibration
instruction shall be prepared and submitted to the procuring
activity.
4.6 Test methods and procedures. Unless otherwise specified
in the contract, the following procedures shall be utilized to
conduct specified tests. If the contractor chooses to use
alternate test procedures,a detailed description of the set-up
and procedure shall be submitted to the government procuring
agency for approval prior to use.
4.6.1 ESS and operatinq temperatures. Testing equipment
utilized in this test shall conform to the requirements of
4.5.2.3.1. The MBC shall be placed in the test chamber and the
temperature of the chamber shall be reduced 5C (9F) Per
minute plus or minus 1C (1.8F) to -57C (-71F) , from
room ambient temperature (as specified in 3.3.1). The MBC shall
be maintained at this temperature for a minimun of 20 minutes.
Upon completion of the 20 minute exposure, the temperature of the
0
chamber shall be raised 5C (9 F) per minute plus or minus
1C (1.8F) to -40C (-40F). The MBC shall be maintained
at this temperature for a minimum of 2 hours. Upon completion of
the 2 hour exposure, the MBC shall be powered up by either an
external (as specified in 3.2.1.1) or internal power source (as
specified in 3.2.1.2). With the MBC powered up, the temperature
of the chamber shall be raised 5 (9F) per minute plus or
minus lC (1.8F) to +71C (+160F). The MBC shall be
maintained at this temperature for a minimum of 2 hours. Upon
completion of the 2 hour exposure and while at +71C (+160F,
the MBC shall be subjected to all the tests in 4.6.3. It shall
meet the requirements of 3.2.1.1 and 3.2.1.11 inclusive. After
meeting the requirements the MBC shall be turned off and the
temperature of the chamber shall be reduced 5C (9F) per
minute plus or minus 1C (1.8F) to room ambient temperature
(as specified in 3.3.1). The above procedure shall be conducted a
minimum of eight times. Upon completion of the cycles the MBC
shall be removed from the chamber and subjected to all the tests
in 4.6.3. It shall meet the requirements of 3.2.1.1 and 3.2.1.11
inclusive.
4.6.2 ESS vibration. Conduct the vibration test with the MBC
positioned on an appropriate adapter affixed to a vibrating
machine that is capable of providing the amplitudes and
frequencies specified in 3.3.4. Unless otherwise specified, the
test equipment shall be in accordance with the "Test Facilities"
requirements of MIL-F-13926. The applied motion shall be in two
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