Downloaded from https://www.everyspec.com MIL-STD-81OD 19 July 1983 (a) anticipated areas of deployment. (b) The test item configuration. (c) Additional guidelines as appropriate. 1-3.1 &oice of teet D ooeti r a. Operational DU Dose Of the test itew. r FI’DIUthe rEquireIUentS documents, determine the function(s) to be performed by the teat item during or after exposure to direct solar radiation. ., b. lest oblect~. The primary objective of the test are to determine if: (1) The test item can satiefy its operational requirements during and after exposure to solar radiation. (2) The Physical degradation which occurs,during exposure produces adverse effecte on the test item.
Based on this information and the purpose of, the test item, determine what test data are necessary to evaluate the required performance of the teat item during and after exposure to solar radiation. c. ~. Two test procedures are included with this method. Based on the test data requirements, determine which of the test procedures.is applicable. (1) Procedure I - CVCUIIS fOr best effecta. This test procedure is uged if the teat item is expected to withstand the heat from expoeure in the open in hot climates and still be able to perform without degradationboth during and after exposure.
The solar radiation test (as opposed to the high temperature test, method 501.2) should be used when the test iternoould be affected (see I-2) by differential heating or when the heating caused by solar radiation is unknown. After the induced temperature and temperature effects have been determined to be comparable to the temperature and temperature effects that could be produced by method 501.2 (high temperature), the latter could (for economic reasons) be substituted for this solar radiation test. (2) actj.n.l~t-a. This procedure ia used when the principal concern is the possibilitythat long periods of exposure to gunr+hinewill result in detrimental actinic effects.
Becauge actinic effects do not usually occur unless the exposure is prolonged, it is inefficient to uae the cycling teat of procedure 1, which could conceivably take months to conduct. The approach, therefore, is to use an accelerated teat which is designed to reduce the time to produce integrated effects of long perioda of exposure. The key to using this procedure successfully is maintaining enough cooling air to prevent the teat item from exceeding temperatures that would be attained under natural conditions (such as the cycling test simulates), so that there will not be an exaggerated test 19 JUIY 1983 505.2-3 METHOD 505.2