With the improvement of economy, the requirements of various enterprises for testing instruments are also increasing. Many manufacturers are fond of imported products. For the environmental testing equipment industry, the annual import volume of imported high and low temperature test chambers accounts for domestic test box sales. 30%, in fact, whether it is imported or domestic equipment, the purchase requirements are the same, then let's take a look at the purchase requirements for imported high and low temperature test chambers, domestic test equipment can also be used:
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. However, in order to ensure the uniformity of the working chamber of the high and low temperature test chamber, it is necessary to have circulating air in the test chamber.
3. Accuracy control of humidity: Most of the humidity measurement in the environmental test box is by 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.
4. Temperature 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 in the same temperature environment during the environmental test. For this reason, the temperature in the test box must be Gradient 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) ".
5. Selection of cooling method: If the high and low temperature test box is equipped with a refrigeration system, the refrigeration system needs to be cooled. The test box has two forms: air cooling and water cooling.
6. Another important point is that when selecting the test box, the volume of the test box must be selected according to the size and number of samples to be tested, to avoid the embarrassing situation of too much waste and too small to use. Afterwards, we must also look at the external conditions required by the equipment and whether it can enter the laboratory designated by the company. These factors are also essential.
7. Finally, no matter whether you choose imported or domestic equipment, you should have a comprehensive understanding of the manufacturer's background, brand influence, market efficiency, etc., I hope you can find cost-effective companies that have needs for the test box High equipment.
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