The temperature rise and fall rate of a high and low temperature test chamber also reflects the performance of the equipment. One is the average temperature rise and fall speed in the whole process, and the one is the linear temperature rise and fall speed. It is a certain temperature and humidity during a certain period of the test. The ratio goes up and down. The average speed of the whole process refers to the ratio of the difference between the highest temperature and the lowest temperature to the time within the variable temperature range of the test box, that is, the rate of rise and fall of the entire high and low temperature test is generally consistent. The temperature rise and fall of our general experimental equipment is the average rate of the whole process, which can improve the service life of the equipment. The linear temperature rise and fall speed refers to the temperature change rate that can be guaranteed in any certain period of time. In fact, for the rapid temperature change high and low temperature test chamber, it is the most difficult and the most critical period to ensure the linear temperature rise and fall speed. In the last 5 minutes of the temperature decrease period, the temperature drop rate that the test chamber can reach. Therefore, the high and low temperature test chamber preferably has two parameters: the average temperature rise and fall speed and the linear temperature rise and fall speed (average speed every 5 minutes). Generally speaking, the linear temperature rise and fall speed is 1/2 of the average temperature rise and fall speed. Generally, during the equipment test, the heating rate is relatively large, and the cooling rate is relatively slow.
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