The rate of our standard high and low temperature test chamber is 1-3 degrees Celsius / minute, and the cooling rate is 0.7-1.0 degrees / minute. According to the different needs of different test pieces, the requirements of working conditions are getting higher and higher. The test needs to determine the components, equipment and The ability of other products to withstand rapid changes in ambient temperature requires high and low temperature test chambers to carry out rapid temperature change tests, that is, the temperature rise and fall speed can be adjusted within 20 degrees / minute according to the working conditions.
The test description is that the test sample is alternately exposed to low temperature and high temperature air (standard atmosphere or suitable inert gas) to withstand the rapid temperature changes. The test process should have a low temperature box, a high temperature box, and two boxes placed The position of the test sample should be able to transfer the test sample from one box to another box within the specified time. The conversion method can be automatic or manual transfer. Any area where the sample is placed in the test box should be able to maintain the air temperature specified in the test , The absolute humidity of the air in the box should not exceed 20G / m3, the temperature of the high-temperature box wall should not exceed 33% of the specified temperature of the test (in absolute temperature K), and the temperature of the low-temperature box wall should not exceed the specified temperature of the test (in K 8% of the meter), this requirement applies to the entire inner wall of the test chamber. There should be no direct radiation between the test sample and any heating and cooling elements that do not meet the above requirements. The volume and air velocity of the test chamber should meet the requirements of the discharge test. After the sample, the time for the air temperature in the box to return to the specified tolerance range does not exceed 10% of the test time.
The uniformity of the test box is ensured by air circulation. The placement of the test sample should not exceed 3/2 of the total volume of the test box. The air flow velocity around the test sample should not be less than 2M / S. The wind speed of Shanghai Linpin is controlled at 3.7M / S, it is very reasonable to ensure the best uniformity of the high and low temperature test box. The heat conduction of the sample holder or support should be low, so that the test sample is actually insulated. When several test samples are tested at the same time, The air between each test sample and between the test sample and the box wall should be allowed to circulate freely.
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