The standard test purpose of the non-heat dissipation test samples in the high and low temperature test chamber is to provide a standard test procedure to determine the suitability of non-heat dissipating electrical and electronic products (including components, equipment and other products) in low temperature storage or use. The sample should be placed at a low temperature for a long enough time to achieve temperature stability. The test duration is usually calculated from the time when the test sample reaches temperature stability. This test is to put the test sample with room temperature into the high and low temperature test chamber with the temperature at room temperature. Then adjust the temperature of the test chamber to a temperature value that meets the severity level of the relevant specifications. After the test sample reaches temperature stability, it is exposed to the specified duration under the changed conditions. The test sample is usually in a non-working state. This test is usually used Forced air circulation, the temperature conditions required by the standard test procedures should be provided in the working space of the test box. Forced air circulation can be used to maintain uniform temperature. To limit the effects of radiation, the difference between the temperature of each part of the inner wall of the box and the specified test temperature difference should not exceed 8% (calculated according to Kelvin temperature), and the test sample is not Subjected to any direct radiation heating and cooling element does not meet the above requirements.
When the test sample is actually used with a specific mounting bracket, these devices should be used for the test together to adjust the temperature of the test chamber to a temperature value that meets the severity level and has enough time to allow the sample to reach the temperature Stable, the temperature change rate in the test chamber is not more than 1K / min (the average value of not more than 5min time), the test ambient temperature should be measured according to the standard, for the functional test, the test sample must be energized or added according to the relevant specifications Electrical load, and check whether it can achieve the specified function. If required by the relevant specifications, the test sample should be in operation according to its specified working cycle and load conditions, or it should not be powered (Note: At this time, the test sample is in operation or Under load conditions, as long as the surface temperature does not exceed the surrounding atmospheric temperature of 5K, they are considered to be non-heat dissipating). After the test period, the recovery of the test sample can be carried out in the test box or in other suitable ways. , The test sample is in the state of energized operation or electrical load, it should be stopped before the temperature is increased or unloaded Go to load. Standard test of non-heat dissipation test samples in high and low temperature test chamber
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