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How to correctly choose the temperature change rate of the high and low temperature test chamber

by:Sure     2021-08-19
◆ Ordinary high and low temperature test chambers have no indicator of cooling speed. The time from ambient temperature to the nominal minimum temperature is generally 90 to 120 minutes. Both the high and low temperature alternating test box and the high and low temperature alternating damp heat test box have requirements for the temperature change rate. The temperature change rate generally requires 1°C/min, and the speed is adjustable within the range of this rate. The rapid temperature change test box has a faster temperature change rate. The ordinary high and low temperature test box does not have an index of cooling speed. The time from the ambient temperature to the nominal minimum temperature is generally 90 to 120 minutes. Both the high and low temperature alternating test box and the high and low temperature alternating damp heat test box have requirements for the temperature change rate. The temperature change rate generally requires 1°C/min, and the speed is adjustable within the range of this rate. The rapid temperature change test box has a faster temperature change rate, and the heating and cooling rate can reach 3℃/min~15℃/min. In some temperature sections, the heating and cooling rate can even reach more than 30℃/min. ◆Rapid temperature change of various specifications and speeds. The temperature range of the high and low temperature test chamber is generally the same, that is -60~+130℃, but the temperature change range of the cooling speed is not the same. According to the different test requirements of the test, fast The temperature change range of the high and low temperature test chamber is -55~+80℃, and some are -40~+80℃.  ◆There are two formulations for the temperature change rate of the rapid temperature change high and low temperature test box, one is the average temperature rise and fall speed throughout the process, and the other is the linear temperature rise and fall speed (actually the average speed every 5 minutes). The overall average speed refers to the ratio of the difference between the highest temperature and the lowest temperature to the time within the temperature change range of the test chamber. At present, the technical parameters of the temperature change rate provided by various foreign environmental test equipment manufacturers all refer to the overall average speed. The linear temperature rise and fall speed refers to the guaranteed temperature change rate in any time period of 5 minutes. In fact, for the rapid temperature change high and low temperature test box, the most difficult and most critical section to ensure the linear temperature rise and fall speed is the cooling rate that the test box can achieve within the last 5 minutes of the cooling section. Therefore, it is better for the test equipment to have the two parameters of the average temperature rise and fall speed throughout the process and the linear temperature rise and fall speed (average speed per 5 min). Generally speaking, the linear rise and fall speed (average speed per 5 min) is 1/ of the average temperature rise and fall speed throughout the process. 2.
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