How to Control Environmental Parameters in Environmental Test Chamber

Most of the humidity in the environmental chamber is measured by the wet-and-dry ball method and the manufacturing standards for environmental testing equipment. The relative humidity deviation should be ±2.3% RH. In order to meet the requirements of humidity control accuracy, the temperature control accuracy of the humidity chamber is high, and the temperature fluctuation is generally less than ±0.2°C. Otherwise it is difficult to meet the requirements of humidity control accuracy. In general, the temperature and humidity can be measured by the temperature and humidity self-recording device. The temperature and humidity self-recording device is one of the recorders capable of simultaneously measuring the temperature and the humidity.
According to the principle of heat conduction, the temperature of the air flow near the box wall is usually 2 to 3° C. lower than the center temperature of the flow field, and may reach 5° C. when the upper and lower limits of high and low temperatures are met. The temperature of the tank wall is different from the temperature of the flow field near the tank wall by 2 to 3°C (depending on the structure and material of the tank wall). The greater the difference between the test temperature and the external atmospheric environment, the greater the above temperature difference. Therefore, the distance from the tank The space within the distance (100-150mm) of the wall is an unavailable space.
In addition, in the environmental test, the wind speed and direction outside the box should also be controlled, such as the wind speed should be less than 1.7m / s, for the test itself, the wind speed is as small as possible, the wind speed over the General Assembly to accelerate the test surface and the box The heat exchange of the flowing gas flow in the body is unfavorable for the authenticity of the test. However, in order to ensure the uniformity of the chamber of the chamber, it is necessary to have circulating air in the chamber. The wind anemometer can timely monitor the wind speed and direction around the test box. However, rapid temperature change high and low temperature test chambers and multi-factor comprehensive environmental test chambers such as temperature, humidity, and vibration, in order to pursue a variable temperature rate, it is necessary to speed up the flow rate of circulating air in the box, and the wind speed is usually 2 to 3 m/s. Therefore, for different purposes of use, the speed limit is not the same. In addition, when we simulate the natural environment, we also need to control the temperature of the surrounding environment. At this time, we must limit the temperature gradient and temperature fluctuation in the test chamber. In the general rule of the GJB150.1-86 military equipment environmental test method, it is stipulated that “the temperature of the measurement system near the test sample should be within ±2°C of the test temperature, and the temperature should not exceed 1°C/m or the total maximum value. 2.2 °C (test sample does not work)".
Through the individual control of each environmental parameter, a series of recorders are used to determine the changes in the environmental parameters. Finally, a comprehensive environment is obtained to ensure the normal operation of the environmental chamber.

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