The general high and low temperature test chamber has no cooling rate index, and the nominal time from ambient temperature to minimum temperature is generally 90 ~ 120min. Alternating high and low temperature test chambers, high and low temperature alternating heat and humidity test chambers all have requirements for the rate of temperature change. The general requirement for the temperature change rate is 1 ° C / min, and the speed is adjustable within this rate range. However, the rapid temperature change test chamber has a fast rate of temperature change, heating, and a cooling rate of 3 ° C / min ° to 15 ° C / min. In a certain temperature section, the cooling rate can even reach more than 30 ° C per minute.
The rapid temperature change of various specifications and speeds The temperature range of the high and low temperature test box is usually -60 ~ +130 ℃, but the temperature change range of the cooling rate is different. According to different test requirements, the temperature range of the high and low temperature test box is -55 ~ +80 ℃, and some are -40 ~ +80 ℃.
There are two ways to mention the temperature change rate of the high and low temperature test chamber, which are the average cooling rate of the whole process and the linear heating and cooling rate. 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. The linear temperature rise and fall speed refers to the rate of temperature change that can be guaranteed in any period of every 5 minutes. In fact, for the high and low temperature test chamber, it is the most difficult and most critical period to ensure the linear temperature rise and fall speed. In the last 5 minutes of the temperature fall period, the temperature fall 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 5min). Generally speaking, the linear temperature rise and fall speed (average speed every 5min) is the average temperature rise and fall speed. 1/2.
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