Constant temperature and humidity test chamber Beijing Yashilin is upgraded from the original Japanese OYO button-type instrument to touch screen, programmable easy-to-control instrument, remote control, upload and download instrument data curve, etc. It is a new type of constant humidity and humidity. Testing equipment. The constant temperature and humidity test chamber is also known as the “programmable constant temperature and humidity test chamberâ€. In the test stage, there is a cycle test failure. The following three reasons for the failure of the constant temperature and humidity test chamber cycle test are detailed by Beijing Yashilin. First, the mechanism of temperature cycle stress induced failure and sensitive components: temperature cycling makes different expansion factors of different materials different, resulting in peeling, cracking, its sensitive components such as paint coating, etc.; temperature cycle makes the screw connection or riveting The loose joints are loose, and their sensitive components such as screws and riveted parts; temperature cycling causes corrosion and contamination of the contacts, and sensitive components such as alloy materials. Second, the temperature cycle stress characteristics analysis: In the temperature cycle test, the uniformity of the airflow in the programmable constant temperature and humidity test chamber is an important parameter, which will affect the temperature change rate of the product. This requires that when multiple test products are tested simultaneously, there should be appropriate spacing between the test products and between the test product and the test chamber wall so that the air flow can freely circulate between the test products and between the test product and the tank wall. . Third, the basic parameters of temperature cycle stress are mainly six: 1, the upper limit temperature; 2, the lower limit temperature; 3. Temperature change rate; 4, the upper limit temperature holding time; 5, the minimum temperature holding time; 6, the number of cycles.
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