According to the relevant standards of the high and low temperature test box, the visual inspection of the test sample and the electrical and mechanical properties are tested. The following is the standard procedure for the damp heat test of the test box: First, put the unpackaged and non-energized test samples into the working space of the test box in the "ready to use" state according to the normal working position or the state specified by the relevant standards, and put the temperature in the box without humidification Raise to 40 ℃ to preheat the test sample, and then humidify after the test sample reaches a stable temperature to avoid condensation of the test sample. After the temperature and relative humidity in the working space reach the specified value and stabilize, the test duration is calculated , During or at the end of the test, the high and low temperature test chambers may require that the test sample be electrically loaded and measured, and specify the measurement time and measurement items. During the intermediate test, the test sample is not allowed to be removed from the test chamber, nor is it allowed to Measure after recovery. If you want to know the performance of this type of test sample before the end of the conditional test, you must add another set of test samples for each specific test time. The recovery and final testing of each set of samples should be performed separately. At the end of the conditional test, the general test sample shall be restored under the conditions of Article 5.3 of GB2421 for a period of not less than 1h, but shall not More than 2h, for test samples with large thermal time constant, the recovery time should be long enough to stabilize the temperature. Depending on the characteristics of the test sample and laboratory conditions, the test sample can also be left in the test box to recover, or Recover in the other test box. When left in the test box to recover, the relative humidity should be reduced to 75% ± 3% within 0.5h, and then the temperature should be adjusted to meet the corresponding requirements of GB2421 standard within 0.5h. The temperature tolerance is ± 2 ℃, when transferred to another test box for recovery, the time for transferring test samples should be as short as possible, and the longest should not exceed 5min. The relevant standard should indicate whether special measures are required to remove the moisture on the surface of the test sample. If the recovery conditions of the above standards are not applicable to the test sample, the related standard may propose additional recovery conditions and check the appearance of the test sample according to the requirements of the relevant standard To test its electrical and mechanical properties, the test should be carried out immediately after the recovery phase, and the most sensitive parameters to humidity changes should be measured first, unless otherwise specified in the relevant standards, all parameters should be measured within 30min. Standard procedure for high and low temperature test chamber damp heat test skin analysis machine,Skin Analyzer,Facial Skin Analyzer Xi'an Double H Health Technology Co., Ltd , https://www.dhextract.com