As we all know, the most important indicators to determine the performance of the temperature and humidity test chamber are temperature uniformity, fluctuation and wind speed. The editor of this chapter explains these three core parameters in detail:
Temperature uniformity of constant temperature and humidity test chamber
In order to more accurately simulate the actual environmental conditions suffered by the product in nature, it must be ensured that the periphery of the tested product is at the same temperature and environmental conditions during the environmental test. For this reason, the temperature gradient and temperature fluctuation in the test box must be Be restricted. The general provisions of the national military standard GJB150.1-86 military equipment environmental test methods clearly stipulate that the temperature of the measurement system near the test sample should be within ± 2 ℃ of the test temperature, and its temperature should not exceed 1 ℃ / m or the maximum It is 2.2 ℃.
Temperature fluctuation of constant temperature and humidity test chamber
Temperature fluctuation is a relatively easy parameter to realize. The actual temperature fluctuation of most test chambers produced by all environmental test equipment manufacturers can be controlled within ± 0.3 ℃.
Wind speed of constant temperature and humidity test chamber
The relevant standards stipulate that the wind speed in the temperature and humidity box should be less than 1.7m / s during the environmental test. For the test itself, the smaller the wind speed, the better. The authenticity of the test is unfavorable. But in order to ensure the uniformity of the working chamber of the test box, it is necessary to have circulating air in the test box. However, the rapid temperature change high and low temperature test box and the multi-factor comprehensive environmental test box such as temperature, humidity, vibration, etc., in order to pursue the temperature change rate, the velocity of the circulating air flow in the box must be accelerated, and the wind speed is usually 2 to 3 m / s. Therefore, for different purposes, the wind speed limits are different.
Description of uniformity, fluctuation and wind speed of constant temperature and humidity test chamber
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