The temperature impact test plays a vital role in the qualification testing of equipment and is also commonly used during routine production stages. In certain cases, it serves as an environmental stress screening tool. It can be said that its application frequency in verifying and enhancing the environmental adaptability of equipment ranks just after vibration and high-low temperature tests. This test is widely applied in China under standards such as GJB 150-86 "Test Methods for Military Equipment," GB 2423 "Basic Environmental Test Procedures for Electrical and Electronic Products," and the U.S. military standard MIL-STD-810F "Environmental Engineering Considerations and Laboratories." Although the test is considered an independent project in these three standards, there are significant differences in content and even in concept. Below are the test conditions for temperature shock test chambers specified in these three standards: **Standard** **Test Temperature** **Hold Time** **Cycle Number or Number of Impacts** **Conversion Time** **GJB 150.5** High temperature: 70°C Low temperature: -55°C 1 hour or until stable temperature, whichever is longer 3 cycles ≤5 minutes **GB/T 2423.22** Preferred temperature levels (high temperature from 200°C to -30°C across 10 levels, low temperature from -65°C to 5°C across 7 levels) 3 hours, 2 hours, 1 hour, 30 minutes, or 10 minutes (depending on the product’s thermal capacity). If unspecified, 3 hours is recommended 5 cycles 2 to 3 minutes **MIL-STD-810F Method 503.4** Customized based on the expected deployment environment Real exposure time or stabilization time (also depending on the product’s thermal capacity) 1 time, 3 times, or more Try not to exceed 1 minute. If it exceeds 5 minutes, consider whether the test is necessary. Understanding these differences helps engineers choose the most suitable test method based on the product's application and environmental requirements. Each standard reflects different priorities, with GJB 150.5 focusing on military-grade durability, GB 2423 emphasizing electronics, and MIL-STD-810F offering flexibility for real-world scenarios. By carefully selecting the appropriate test parameters, manufacturers can ensure their products perform reliably under various environmental stresses.

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