GJB150.3A-2009, titled "High Temperature Test for Environmental Test Methods in Military Equipment Laboratory," provides detailed guidelines for conducting constant temperature operation tests using a high-temperature test chamber. The following procedure outlines the key steps to ensure accurate and reliable testing:
First, the test item must be installed in accordance with its operational configuration. Next, the air temperature inside the high-temperature chamber should be adjusted to the required constant temperature, and if humidity is a factor, it should also be set accordingly. Once the desired conditions are achieved, the chamber should be maintained for at least two hours after the test item's temperature stabilizes. If internal components cannot be directly measured, additional time may be required based on thermal analysis to ensure uniform temperature distribution across the entire unit.
After stabilization, a visual inspection of the test item should be conducted, and all observations should be documented. These results should then be compared with pre-test data to identify any changes or anomalies. Following this, the test item should be operated under normal conditions to ensure its temperature stabilizes again. Performance tests should be carried out according to the technical specifications, and the outcomes should be recorded and compared with the initial data.
Once the performance evaluation is complete, the test item should be turned off, and the chamber's environmental conditions should be returned to standard atmospheric levels. The chamber should remain in this state until the test item reaches a stable temperature. Finally, a thorough visual inspection and comprehensive performance test should be conducted again, with all findings documented and compared against the pre-test data to assess the impact of the high-temperature exposure.
This process ensures that military equipment undergoes rigorous environmental testing, meeting the strict standards outlined in GJB150.3A-2009.
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