MIL-K-70493(AR)
0.50F per foot in any direction. The heat source of the test chamber shall be so located that radient heat, if used, will not fall directly on the test item. Thermocouples or equivalent 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 airstream, 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 conduct specified tests. If the contractor chooses to use alternate test procedures, a detailed description of he 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 test shall conform to the requirements of 4.5.2.3.1. The keyboard shall be placed in the test chamber and the temperature of the chamber reduced 10oC (18°F) per minute plus or minus 1°C
(1.8oF) from room ambient temperature (as specified in 3.3.1) to
-570C (-710F). The keyboard shall be maintained at this
temperature for a minimum of 20 minutes. Upon completion of the
20 minute exposure, the temperature of the chamber shall be raised
100c (180F) per minute plus or minus 1°C (1.8°C) to
+71OF (+1600C). The keyboard shall remain at this temperature for a minimum of 20 minutes. Upon completion of the 20 minute exposure the temperature of the chamber shall be reduced 10oC (180F) per minute plus or minus 10C (1.80F) to room ambient temperature (as specified in 3.3.1). The above procedure shall be conducted a minimum of ten times. Upon completion of the cycles the keyboard shall then be removed from the chamber and subjected to the tests in 4.6.3 and 4.6.5 inclusive. It shall meet the requirements of 3.2.1.1 and 3.2.1.3 inclusive.
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