The constant temperature and humidity test chamber is mainly divided into three parts: high temperature, low temperature and humidity. How to confirm the quality of the test box? The following sections of the Beijing Yashilin Technical Department are listed below, please refer to:

Temperature part of constant temperature and humidity test chamber:

1. Temperature fluctuation: Temperature fluctuation is a relatively easy parameter. The actual temperature fluctuation of most test chambers produced by all environmental test equipment manufacturers can be controlled within ± 0.3 ℃.

2. Wind speed: 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. Heat exchange is detrimental to the authenticity of the test. But in order to ensure the uniformity of the working room of the constant temperature and humidity test chamber, it is necessary to have circulating air in the test chamber.

3. Temperature field uniformity: 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 in the environmental test. Temperature gradients and temperature fluctuations are limited. 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 ℃ (the test sample does not work) ".

Fourth, the choice of cooling method: the refrigeration system needs to be cooled. The test box has two forms: air cooling and water cooling.

Humidity part of constant temperature and humidity test chamber:

Accuracy control of humidity: Most of the humidity measured in the environmental test box is the wet and dry bulb method. The manufacturing standard of environmental test equipment GB10586 requires that the relative humidity deviation should be within ± 23% RH. In order to meet the requirements of humidity control accuracy, the temperature control accuracy of the humidity test chamber is high, and the temperature fluctuation is generally less than ± 0.2 ℃. Otherwise, it is difficult to meet the requirements of humidity control accuracy.

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