During the test of the high and low temperature test chamber, an intermediate test shall be carried out. During the conditional test, the relevant standards may require the electrical and mechanical properties of the test sample to be tested. During the intermediate test, it is not allowed to move the test sample out of the working space and resume the measurement. If the relevant standards for intermediate testing are required, the measurement items and the stage of the conditional test shall be clearly specified.
After the conditional test, the test sample should be restored for 1-2h. The relevant standards stipulate that it should be restored under atmospheric conditions. If it is required to restore under controlled restoration conditions, the product can be moved to another high and low temperature test chamber for transfer. The time of the sample should be as short as possible. If there is no stipulation in the relevant standard, it should generally not exceed 10 minutes. The test sample can also be left in the original road test equipment for recovery. At this time, the relative humidity in the working space of the test box should be 0.5. Reduce to 75% ± 3% within h, and then reduce the temperature to the laboratory temperature within 0.5h with a tolerance of ± 2 ℃. The recovery time should be calculated from the time when the specified recovery conditions are reached. For the test with a large thermal time constant For samples, the recovery time should be long enough to allow the test samples to reach temperature stability. The relevant standards should state whether special measures should be taken to remove moisture from the surface of the test samples.
Check the appearance of the test sample according to the relevant standards, and test its electrical and mechanical properties. The final test should be performed immediately after the recovery phase. The most sensitive parameters to relative humidity should be measured first. If there are no other regulations, all The measurement of parameters should be completed within 30 minutes.
Attachment: The detailed rules that should be stipulated when the high and low temperature test chamber is quoted: the severity level, the initial test, the state of the test sample during the conditional test, the requirements for the sample rack or support, the lower limit value of the relative humidity during the cooling stage, intermediate test, recovery Conditions, measures to eliminate surface moisture, and final inspection.
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