MIL-STD-2105D
5. DETAILED REQUIREMENTS
5.1 Basic safety tests. Consider all of the following tests for inclusion in the hazard assessment test program. Unless otherwise specified (see paragraph 6.3), test three test items sequentially as shown in figure 2.
5.1.1 28-day temperature and humidity (T&H) test.
5.1.1.1 Description of test. The 28-day T&H test consists of exposing the test item to alternating 24-hour periods (no period lasting less than 24 hours) of high and low temperatures for a total of 28 days. Derive the temperature range and relative humidity from the environmental profile of paragraph
4.1.3. Test a minimum of three test items.
5.1.1.2 Test procedure. Develop test procedures (see paragraph 6.2) that reflect the temperature and humidity conditions measured or forecast. Visually examine each test item prior to testing, and record the appropriate critical dimensions. Unless otherwise specified (see paragraph 6.3), prior to testing, radiographically examine the test items to determine material condition.
5.1.1.2.1 Test facilities. Use chambers that are capable of producing the required temperatures and humidity over the time spans specified in paragraph 5.1.1.1, and that do not obstruct the free flow of air in contact with the item under test. Recommend using separate chambers for each test environment specified.
5.1.1.2.2 Temperature cycling. Begin the test by subjecting the test item to either the high or low temperature environment for a 24-hour period. At the end of this period, transfer the test item to the other environment. Perform the transfer in less than 30 minutes, but if the transfer time exceeds 30 minutes, document the actual time in the test data report (see paragraphs 5.1.1.5 and 6.2). At the end of each
high and low temperature cycle change, inspect the test item for damage and collect any exudate for chemical analysis. Continue
testing and inspecting for the number of periods specified for the test.
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