Environmental test equipment is a precision and valuable equipment. The correct use and operation of environmental test equipment can not only provide accurate basis for testing personnel, but also make the environmental test equipment run normally for a long time and extend the service life of its equipment.
First of all in the environment test, the required test sample performance, test conditions, test procedures and test technology to be familiar with, to the technical performance of test equipment used to be familiar with the equipment structure, to understand, especially the operation and performance of the controller to be familiar with. We also need to read the manuals of manui test equipment carefully, so that we can avoid the abnormal operation of the test equipment due to operational errors, which will lead to the damage of the test samples and the incorrect test data.
Secondly, the test equipment is selected reasonably. In order to ensure the normal operation of the test, appropriate test equipment should be selected according to the different conditions of the test sample, and a reasonable proportion between the test sample and the effective volume of the test chamber should also be maintained. For the test of the sample of heat test, the volume should not be more than 1/10 of the effective volume of the test case. The volume of the test sample for the non heating test shall not be more than 1/5 of the effective volume of the test case. For example, a 21` color TV in the temperature storage test, can meet the test requirements of a box of a cubic volume selection, while in power, it can not meet the requirements, should change to a bigger test box, because the TV to dissipate heat at work.
Third, the test samples are properly placed. The placement of the test sample should be removed from the box wall above 10cm, and many samples should be placed on the same plane as far as possible. The sample placement should not be blocked out of the tuyere and the air outlet, and the temperature and humidity sensors should also be set aside for a certain distance. To ensure that the test temperature is correct.
Fourth, the environmental test that needs to be added to the medium in the test should be added correctly according to the requirements of the test. If the water is hot and humid chamber has certain requirements, test box shall not be less than 500 Euro rate with water resistance. The general tap water meters, the resistivity of 10--100 ohm. M, distilled water resistivity 100--10000 ou. M, deionized water resistivity 10000-100000 ohm. M, so the damp heat test water to use distilled water or deionized water, and some use of fresh water, because contact with air, susceptible to carbon dioxide and dust pollution, water soluble substances can, after a long time, the resistivity will decrease. Now, there is a kind of pure water on the market, which is economical and convenient, and its resistivity is equivalent to distilled water.
Fifth. The use of the hot and wet test box. Wet bulb gauze (wet bulb paper) has certain requirements for wet heat test box, not any gauze can be used instead, because relative humidity reading is the difference between temperature and humidity, and it is also related to local atmospheric pressure and wind speed. The value of wet bulb temperature is related to the amount of water inhaled by gauze and the condition of surface evaporation. These are directly related to the quality of the gauze, so it is stipulated in the weather that the wet ball gauze must be a special "wet ball gauze" woven from flax. Otherwise, it is difficult to ensure the correct value of the wet bulb thermometer, that is, the correct humidity. In addition, the placement of wet bulb gauze is also specified. The gauze length is 100mm, and the sensor is tightly wound, the probe is 25 to 30mm from the humidity cup, and the gauze is immersed in the water cup, so as to ensure the correctness of the device control and the accuracy of the humidity.
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