The temperature cycle of the high and low temperature impact test chamber is to expose the test sample to the predetermined high and low temperature alternating test environment. To avoid the impact of temperature shock, the temperature change rate during the test must be less than 20 ° C / min. At the same time, in order to achieve the effect of creep and fatigue damage, it is recommended that the test temperature cycle be 25 ° C to 100 ° C, or a cycle test of 0 ° C to 100 ° C may be used according to the application of the product, and the exposure time is 15 minutes each.
Environmental Stress Screening Test (ESS = Environmental Stress Screening): The application of environmental stress to the product prompts the early exposure of potential defects in the product to be eliminated as soon as possible. ESS is not an accelerated reliability test, which is mainly applicable to the reliability screening test of finished products.
Comparison of temperature shock test and temperature cycle test Various test purposes and environmental conditions: Purpose Accelerated stress test Accelerated life test Environmental stress screening test (ESS) test standard MIL-STD-202Method107IEC60749-25 JEDECJESD2
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