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Inspection equipment desire requirements. |
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|  MIL-C-70492(AR)
prescribed product tolerance limit. Thus, concept, construction,
materials, dimensions, and tolerance used in the design of test
equipment shall be so selected and controlled as to insure that
the test equipment will reliably indicate acceptability of a
product which does not exceed 90% of the prescribed tolerance
limit, and permit positive rejection when non-conforming.
Construction shall be such as to facilitate routine calibration of
test equipment.
4.5.2.3
Inspection equipment desire requirements.
4.5.2.3.1 Temperature testinq. The volume of the test
chamber shall conform to the test facilities requirements of
MIL-F-13926. The air temperature at the control sensor shall be
in accordance with the specified requirements within plus or minus
2.5F (1.4C). The temperature gradient across the
cross-sectional area occupied by-the test item shall not exceed
The heat source of the test
0.5F per foot in any direction.
chamber shall be so located that radient heat, if used, will not
Thermocouples or equivalent
fall directly on the test item.
temperature sensors utilized to determine or control the specified
chamber temperature shall be centrally located within the test
chamber within the supply airstream, or in the return airstreamr
whichever provides the specified test condition at the item under
test and shall be baffled or otherwise protected against radiation
effects.
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
If the contractor chooses to use
conduct specified tests.
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 temperature. Testing equipment utilized in this
The modem
test shall conform to the requirements of 4.5.2.3.1.
circuit card assembly shall be placed in the test chamber and the
o
0
temperature of the chamber reduced 10 C (18 F') per minute plus
o
o
or minus l C (1.8 F) from room ambient temperature (as
The assembly shall be
specified in 3.3.1) to -57C (-71F).
maintained at this temperature for a minimum of 20 minutes. Upon
completion of the 20 minute exposure, the temperature of the
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