How to use the core knowledge of environmental testing equipment correctly

Environmental testing equipment is a sophisticated, valuable equipment. Proper use and operation of the environmental test equipment not only provides an accurate basis for the test personnel, but also enables the environmental test equipment to operate normally for a long time and extend the service life of the equipment.

First of all, when doing environmental tests, be familiar with the sample performance, test conditions, test procedures and test techniques of the required test, be familiar with the technical performance of the test equipment used, and have an understanding of the construction of the equipment, especially Be familiar with the operation and performance of the controller. Also carefully read the operating manual of the test equipment, in order to avoid the abnormal operation of the test equipment caused by the operation error, resulting in damage to the test sample, the test data is not correct.

Second, reasonable selection of test equipment. 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 ratio should be maintained between the test sample and the effective volume of the test chamber. For the test of the heat test sample, the volume should be no more than one tenth of the effective volume of the test chamber. For non-fever test samples, the volume should be no more than one-fifth of the effective volume of the test chamber. For example, when a 21` color TV is used for temperature storage test, a one-cubic-volume test box can be used to meet the requirements. When it is energized, it can not meet the requirements. It should be replaced with a larger test chamber. Because the TV has to radiate heat while working.

Third, place the test sample correctly. The position of the test sample should be more than 10cm away from the wall of the box, and multiple samples should be placed on the same plane as much as possible. The sample should be placed without blocking the air outlet and the return air outlet, and the temperature and humidity sensor should also be set a certain distance. To ensure the correct test temperature.

Fourth, the environmental test for the medium to be added in the test should be correctly added according to the test requirements. For example, the water consumption of the damp heat test chamber is required. The water resistivity of the test chamber shall not be less than 500 ohms. The general tap water resistivity is 10-100 ohms. The distilled water resistivity is 100-10000 ohms. Deionized water. The resistivity is 10,000-100,000 ohms. Therefore, the damp heat test water should be distilled or deionized water, and it must be fresh. Because the water is in contact with air, it is easily contaminated by carbon dioxide and dust. The water has a variety of substances. Nature, after a long time, the resistivity will decrease. There is now a pure water on the market that is economical and convenient, and its electrical resistivity is equivalent to distilled water.

Fifth, the use of the damp heat test chamber. Wet ball gauze (wet ball paper) for wet heat test chambers has certain requirements, not any gauze can be substituted, because the relative humidity reading is the difference between the temperature and humidity, which is strictly related to the local atmospheric pressure and wind speed at that time. . The wet bulb temperature indication is related to the amount of water inhaled by the gauze and the surface evaporation. These are directly related to the quality of the gauze, so the meteorological regulations stipulate that the wet ball gauze must be a special "wet ball gauze" woven into linen. Otherwise it is difficult to ensure the correctness of the wet bulb thermometer, that is, the correct humidity. In addition, the placement of the wet ball gauze is also clearly defined. The length of the gauze: 100mm, the sensor probe is tightly wound, the probe is 25-30mm away from the humidity cup, and the gauze is immersed in the water cup, so as to ensure the correctness of the equipment control and the correctness of the humidity.

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