Heng Jiaxing AO3401
Kaixin micro test
Rongsheng test - lowercase jpg-233K
Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22
Method for selecting volume of constant temperature and humidity test chamber
When the test product (components, components, components or complete machine) is placed in the climatic environment box for testing, in order to ensure that the atmosphere around the test product can meet the environmental test conditions specified in the test specification, the working size of the climate chamber and the tested product The following points should be observed between the dimensions: 1. The volume of the tested product (W×D×H) must not exceed 20% of the effective working space of the test box (20% recommended). It is recommended to use no more than 10% for products that generate heat during the test. 2. The ratio of the windward area of ​​the test product to the total area of ​​the test chamber on the section is not more than (35 to 50)% (35% is recommended). 3. The distance between the outer surface of the test product and the wall of the test chamber should be at least 100~150mm (150mm is recommended). The above three points are actually interdependent and unified. Taking a 1 cubic meter cube box as an example, the area ratio is 1: (0.35 to 0.5), which corresponds to a volume ratio of 1: (0.207 to 0.354). The ratio of the volume to the volume of 100 to 150 mm from the wall of the tank is 1: (0.343 to 0.512). In summary, the above three points stipulate that the working chamber volume of the climatic environment test chamber should be at least 3 to 5 times the outer volume of the tested product. The reason for this is because the test piece is placed in the box and squeezes the smooth passage. The narrowing of the passage will result in an increase in the flow rate of the air flow. Accelerate the heat exchange between the gas stream and the test piece. This is inconsistent with the reproduction of environmental conditions, because in the relevant standards, the temperature flow around the test specimens in the test chamber should not exceed 1.7 m/s, so as to prevent the test specimens and the surrounding atmosphere from being produced. Heat transfer. When the average wind speed in the test chamber is vacant at 0.6-0.8 m/s and does not exceed 1 m/s, the wind speed of the flow field may increase when the space and area ratio specified by the two requirements of a) and b) are met. ~100)%, the average maximum wind speed is (1 to 1.7) m/s. Meet the requirements of the standard. If the volume of the test piece or the wind-breaking area is increased without restriction in the test, the airflow velocity will increase to exceed the maximum wind speed specified in the test standard during the actual test, and the validity of the test results will be suspected.
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