Accurate use of high and low temperature test chamber equipment

Accurate use of high and low temperature box equipment According to the environmental factors simulated by the test equipment, the environmental test equipment can be roughly divided into: climate environment equipment (including biological environment test equipment), mechanical environment test equipment, climate machinery comprehensive environmental test equipment and other environmental test equipment Wait. We have dozens of sets of various environmental testing equipment. Environmental testing equipment provides the necessary information and data for the research and development of modern high-tech products and the regular inspection and acceptance testing of products. Despite this, the environmental testing equipment is still a sophisticated and valuable equipment. Proper use and operation of environmental testing equipment can not only provide an accurate basis for inspectors, but also enable the environmental testing equipment to operate normally for a long time and extend the service life of its equipment. First of all, when doing environmental tests, you should be familiar with the required sample performance, test conditions, test procedures and test techniques, the technical performance of the test equipment used, and the structure of the equipment, especially Be familiar with the operation and performance of the controller. Also carefully read the operation manual of the test equipment. The high and low temperature box can avoid the abnormal operation of the test equipment caused by operation errors, which can cause damage to the test sample and incorrect test data.

Second, choose the test equipment 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 ratio between the test sample and the effective volume of the test box should also be maintained. For the test of the fever test sample, its volume shall not be greater than one tenth of the effective volume of the test chamber. For the non-heat test sample, the volume should not be greater than one-fifth of the effective volume of the test chamber. For example, when a 21` color TV is used in a temperature storage test, a test box with a cubic volume can be used to meet the requirements. When the power is turned on, it cannot meet the requirements. A larger test box should be replaced. High and low temperature box because the TV set must emit heat when working. Third, place the test sample correctly. The location of the test samples should be more than 10cm away from the box wall, and multiple samples should be placed on the same plane as much as possible. The sample should be placed so as not to block the air outlet and return air outlet, and leave a certain distance for the temperature and humidity sensor. To ensure the correct test temperature. Fourth, for the environmental test of the medium required for the test, it should be added correctly according to the test requirements. If the water used in the hot and humid test chamber has certain requirements, the water resistance of the test chamber should not be less than 500 ohms. The general resistance of tap water is 10--100 ohms. The resistance of distilled water is 100-10000 ohms. Deionized water The resistivity is 10000-100000 ohm.m, so the water used in the damp heat test should use distilled or deionized water, and must be fresh. Because the water is in contact with the air, it is easily polluted by carbon dioxide and dust. After a long time, the resistivity will drop.

There is a kind of pure water on the market that is more economical and convenient. The resistivity of the high and low temperature box is equivalent to distilled water. Use of damp heat test chamber. The wet ball gauze (wet ball paper) used in the damp heat test chamber has certain requirements, not any gauze can be substituted, because the relative humidity reading is the root distance is the difference between temperature and humidity, strictly speaking, it is also related to the local atmospheric pressure and wind speed at the time . The wet bulb temperature indication is related to the amount of water absorbed by the gauze and the evaporation of the surface. These are directly related to the quality of the gauze, so the weather stipulates that the wet ball gauze must be a special "wet ball gauze" woven from linen. Otherwise, it is difficult to ensure the correctness of the indication of the wet bulb thermometer, that is, the correct humidity. In addition, the placement of wet ball gauze is also clearly stipulated. The length of the gauze is 100mm. The sensor probe is tightly wound. The probe is 25-30mm away from the humidity cup. The gauze is immersed in the cup.

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