If the high and low temperature test box exceeds the standard requirements for the temperature rise and fall rate, we call it "rapid temperature change test box", in order to provide a standard test procedure to determine the non-heat dissipation caused by the sudden change of temperature that will not cause damage The adaptability of electrical and electronic products (including components, equipment and other products) to be stored and used at low temperature. The test sample should be placed at low temperature for a long enough time to achieve temperature stability. The test duration is usually calculated from the time when the sample reaches temperature stability. This kind of test is to put a test sample with room temperature into a high and low temperature test chamber that meets the severity level specified by the relevant specifications. After the test sample reaches temperature stability, it is exposed to the specified duration under this condition. In this state, forced air circulation is usually used in this test. The working temperature of the high and low temperature test chamber should be able to provide the temperature conditions specified in the standard. Forced air circulation can be used to maintain uniform temperature. The difference in test temperature should not exceed 8% (according to Kelvin temperature Calculated), and the test sample should not be any direct radiation heating and cooling element does not meet the above requirements.
The severity of the test box is mainly determined by the test temperature and the test duration. The relevant specifications should be selected from the following values: 65 ± 3 ℃, 55 ± 3 ℃, 40 ± 3 ℃, 25 ± 3 ℃, 10 ± 3 ℃, 5 ± 3 ℃, -5 ± 3 ℃, the duration is: 2/16/72 / 96H, when the standard is related to the durability or reliability test, the duration required for the test is determined by the relevant specifications Provisions, or the purpose of the test is only to check whether the test sample can work normally at low temperature, then the test time is limited to the temperature of the sample to stabilize.
Attachment: Before the test, the test shall be carried out in accordance with the requirements of the relevant specifications, and the visual inspection and electrical and mechanical properties of the test samples shall be carried out in accordance with the relevant specifications.
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