Downloaded from https://www.everyspec.com MIL-STD-810D 19 July .1983 ,c. Exposed. to reflected solar radiation. . ... ,. d. Stacked. e. Wind ventilated. I f, Above, on, or under the earth’s surface. 1-3.1.3 ~e(s) .- Two test.procedures are included within this method: storage and operation. Determine the procedure(s) to be used. :..:. s,:, .,..,.’, .,. . ,, y I-3.1.3.1~ ~edure I - Storaae. Procedure I is used to determine”how storage at hi=h temperatures affects the test item’s safety and Performance. This test proce~ure”i~cludes exposure to high temperatures (and low humidity where applicable) that may be encountered in the test itemh storage situation.
The test conditions and duration can be established from field measurements or can be derived from information provided within this procedure: There are two climatic areas (figures 4a and 4b, section 4) where high storage temperatures are typically encountered: Hot and Basic Hot. In each of these climatic areas, the maximum response temperature of.the test item may be higher than the maximum ambient air temperature because the heating from solar radiation is greater on material than it is on the ‘free atmosphere. The storage situation must be evaluated with respect to: a. Exposure to solar radiation:
Is this exposure directly on the test item, shipping container, protective package, shelter, etc.? b. Climatic area of concern. c. Analysis of the path of heat transfer from the ambient air and solar radiation to the test item. 1-3.1.3.2 Procedure II - ODera t. Procedure II is used to determine the performance of the test item during exposure to high-temperature conditions. In most cases, this procedure shall be preceded by procedure “I,unless the-test item is not intended to be stored in a high-temperature environment.
The operational test differs from the storage test in that the test item is conditioned to temperatures determined to be applicable to or resulting from exposure in its operational configuration. Once brought tD this temperature, the test item is operated to determine performance characteristics. The. operational phase can be accomplished by: a. Exposure to cyclic chamber conditions with the test ‘itemDperating either continuously or during the period of aximum.response. b. Exposure to constant temperature where the test.item will be operated following temperature stabilization.
The temperature level for thig exposure will either be given by the requirements documents, derived from the field data, or,derived,from the response to the cyclic chamber conditions. I-3.2 _Cl@ce of re lated tes t cond.. . Having determined the operational purpose, the natural exposure circumstances, and the test procedure(a), it is necessary to select the type of exposure, test.t.emperat. ure(s),.test.duration, test,:item configuration, and any additional appropriate guidelines. tf3THOD501.2 19 July 1983 501.2-4