The temperature impact test is an indispensable test item in the qualification test of the equipment setting and the routine test in the batch production stage, and in some cases can also be used for environmental stress screening. It can be said that its frequency of application in verifying and improving the environmental adaptability of equipment is second only to vibration and high and low temperature tests. The test project is commonly used in China for environmental testing standards GJB 150-86 "Equipment Test Methods for Military Equipment", and GB 2423 "Basic Environmental Test Procedures for Electrical and Electronic Products" and US Military Standard MIL-STD-8lOF "Environmental Engineering Considerations and Laboratories" The test is an independent test project. This pilot project in the three standards differs greatly in some content and even in concept. The test conditions for the temperature shock test chambers in the three series of standards are listed below:
standard
Test temperature
Hold time
Cycle number or number of impacts
Conversion time
GJB 150.5
High temperature: 70 ° C5
Low temperature: -55 ° C
1h or stable temperature, whichever is longer
3 cycles
≤5min
GB/T 2423.22
The series of temperature values ​​provided by the standard are preferred (high temperature from 200 ° C to 30 ° C 10 levels, low temperature from -65 ° C to 5 ° C total 7 levels)
3h, 2h, 1h, 30min, 10min (depending on the heat capacity of the product), if the relevant standards are not specified, choose 3h
5 cycles
2 to 3 minutes
MIL-STD-810F Method 503.4
Tailored according to the expected deployment situation
Real exposure time or temperature stabilization time (also depending on the heat capacity of the product)
1 time, 3 times, 3 times or more
Try not to exceed 1 min. If it is greater than 5 min, consider the necessity of this test.
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