The test severity level of the high and low temperature test chamber increases with the following factors: increased temperature difference, accelerated temperature change rate, and faster heat transfer mechanism, and the minimum severity level test corresponding to the required amount of test sample performance data should be specified Test N is preferentially used as part of a sequence test. Some types of damage cannot be shown in the final measurement of test N, but only show up during subsequent tests, for example: Test Q: Sealed (GB / T 2423.23 ), Test Fc and guidelines: vibration (sinusoidal GB / T 2423.10) Test Ca: constant humid heat (GB / T 2423.3), test Db: alternating humid heat (GB / T 2423.4), as long as possible, the condition test time should be specified as : That is, according to the daily working hours or the total number of cycles configured in 24h, and take into account the recovery time and the last detection time, if for some reason, to avoid conversion at night and affect the detection, it is necessary to continue the test sample in the test Keep this provision in the box for a long time when exposed to the atmosphere, it should be kept in a low temperature box, because long-term exposure to the hot atmospheric environment can produce aging effects, provision During the degree change test, the nature of the test article and its possible damage mechanism under the influence of temperature change conditions should be considered, and the items of initial detection and final detection should be determined based on this. In some cases, it is enough to consider only mechanical damage Therefore, especially for the equipment under test, the performance test during the temperature change test should be considered first.
It is an extremely prudent matter to specify the temperature change test. Its successful application depends on the technical parameters and performance of the test sample and whether there is a basic understanding of the damage mechanism that occurs under rapid temperature changes.
Guidance for selecting test types for high and low temperature test chambers
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