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Environmental testing devices are a kind of precise and expensive devices. The proper use and operation of environmental testing equipment can not only provide an accurate foundation for testing personnel, but also keep environmental testing equipment working normally for a long time and extend the life of their equipment.
First of all, when conducting the environmental test, the required test pattern performance, test conditions , you must with be familiar with the test procedures and test techniques, the technical performance of the test devices used and the structure of the devices, in particular the operation and performance of the control. Also read carefullyCarefully read the tester's operation and use manual to avoid damage to the test pattern and incorrect test data due to abnormal operation of the tester due to operation errors.
Second, choose the test device wisely. In order to ensure that the test is carried out normally, appropriate test equipment should be selected according to the different conditions of the test specimens, and a reasonable relationship between the test specimens and the effective volume of the test chamber should be maintained. For testing the heat test specimen, its volume should not be greater than one tenth of the usable volume of the test chamber. In the case of non-heatable test specimens, its volume should not be one-fifth of the usable volume of the test chambert exceed. For example, when a 21-inch color TV performs a temperature storage test, a test box with a volume of one cubic volume can meet the requirements, but when it is turned on, it cannot meet the requirements, and a larger test box should be replaced because the TV must dissipate heat during operation.
Third, place the test sample correctly. The test sample should be placed more than 10cm away from the cardboard wall, and multiple samples should be placed on the same plane as much as possible. Sample placement should not be blocked. Also, a certain distance should be left between the air outlet and the return air outlet for temperature and humidity controltssensor to ensure the correct test temperature.
Fourth, for the environmental test that the medium must be added in the test should it can be added correctly according to the test requirements. For example, there There are certain requirements for water in the damp heat test chamber, and the resistivity of the water in the test chamber should not be lower than 500 ohms. Generally, the resistivity of tap water is 10-100 ohms.m, the specific Resistance of distilled water is 100-10000 ohm m, and resistivity of deionized water is 10000-100000 ohm m. Therefore, distilled water or deionized water should be used for wet heat test water, and it must fbe used as water is easily polluted by carbon dioxide and dust after contact with air. Water has the property of dissolving many substances. After a long time, the specific resistance decreases. Now there is a kind of pure water on the market that is more economical and convenient. The resistance is equivalent to distilled water.
Fifth, use for the humidity and heat test chamber. There are specific requirements for wet bulb gauze (wet bulb paper) used in the damp heat test chamber, no gauze can be substituted as the relative humidity reading is actually the difference between the root distance and the temperature and humidity. It is also related to the local atmospheric pressure at that timement related to wind speedThe value refers to the amount of water absorbed by the gauze and evaporation from the surface. These are directly related to the quality of the gauze so the weather dictates that the wet ball gauze must be a special linen woven wet ball gauze. Otherwise, it is difficult to ensure the correctness of the reading of the wet-bulb thermometer, that is, the correctness of the humidity. In addition, the placement of the wet ball gauze is also clearly specified. The gauze length: 100mm, the sensor probe is tightly wound, the probe is 25-30mm away from the moisture cup, and the gauze is immersed in the cup, so as to ensure the correctness of the device control and ensure humidity.
