Core Tip: Environmental tests, especially reliability tests, have long test cycles. The test objects are sometimes high-value military products. During the test, testers often have to conduct inspections or test work around the site, so environmental test equipment is required. Must have the characteristics of safe operation, convenient operation, reliable use and long working life.
1. Reproducibility of environmental conditions
It is an elusive thing to completely and accurately reproduce the environmental conditions that exist in nature in the laboratory. However, within a certain tolerance range, people can correctly and correctly simulate the external environmental conditions experienced by engineering products during use, storage, transportation and the like.
2. Repeatability of environmental conditions
An environmental test chamber may be used for multiple tests of the same type of product, and one engineered product may also be tested in different environmental test equipment, in order to ensure that the same product is in the same test specification. The comparability of the test results obtained under the conditions necessarily requires the environmental conditions provided by the environmental test equipment to be reproducible. That is to say, the stress level (such as thermal stress, vibration stress, electrical stress, etc.) applied to the product under test by the environmental test equipment is consistent with the requirements of the same test specification.
3. Measureability and control of environmental condition parameters
The environmental conditions provided by any environmental test equipment must be observable and controllable, not only to limit environmental parameters to within certain tolerances, but also to ensure reproducibility and repeatability of test conditions. Moreover, it is necessary to start from the safety of the product test, in order to prevent the damage of the test product caused by the out of control of the environmental conditions, resulting in unnecessary losses.
4. Exclusivity of environmental test conditions
Every time an environmental or reliability test is carried out, there are strict regulations on the types, magnitudes and tolerances of environmental factors, and the environmental factors required for non-tests are excluded from infiltration in order to judge and analyze product failures during or after the test. In the case of failure mode, the exact basis is provided. Therefore, the environmental test equipment is not allowed to attach other environmental stress interference to the test product except for the specified environmental conditions.
5. Safety and reliability of environmental test equipment
Environmental tests, especially reliability tests, have long test cycles. The test objects are sometimes high-value military products. During the test, testers often have to conduct inspections or test work around the site. Therefore, environmental test equipment must be operated. Safe, easy to operate, reliable to use, long working life, etc., to ensure the normal operation of the test itself.
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Label: 5 basic principles of environmental test chamber
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