What is the degree of uniformity of the temperature aging chamber?

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Tests affecting the uniformity of the temperature aging chamber include tank sealing, heat load, heat radiation characteristics, heat transfer, sample placement, internal structure, and the like. The reasons are as follows:

1. Sealing: The sealing of the box and the door is not strict. For example, the sealing strip is not customized with joints, the door is leaking, etc., which affects the temperature uniformity of the working space.

2. Heat load: If the test sample in the test chamber is placed enough to affect the internal thermal convection, it will inevitably affect the uniformity of the internal temperature to some extent. For example, if the LED lighting product is placed, the product itself has radiant heat and becomes hot. Load, then there is a big impact on temperature uniformity. ,

3, thermal radiation: design problems lead to the internal structure, space design of the inspection box is difficult to achieve a uniform symmetrical structure, and the asymmetrical structure will inevitably lead to deviations in the internal temperature uniformity, this level is mainly reflected in the sheet metal design And sheet metal processing, such as: the design of the air duct, the placement of the heat pipe, the size of the fan power and so on.

4, heat transfer: due to the heat transfer coefficient of the front and rear of the box wall of the studio is different, some of the threading holes, detection holes, test holes, etc. lead to local heat dissipation, heat transfer, so that the temperature of the box is not uniform, Therefore, the convection heat transfer of the box wall is not uniform, and the temperature is uniform.

5. Reasonability of selection and placement of the sample to be tested: If the volume of the test object is too large, or the position or mode of the test object placed in the working chamber of the constant temperature and humidity test machine is not suitable, the air convection inside is blocked, and a larger The deviation of the temperature uniformity. For example, placing the test product next to the air duct seriously affects the circulation of the wind, and of course the uniformity of the temperature is greatly affected.

6. Due to the different inner wall structure, the temperature of the inner wall of the test chamber will be uneven, which will affect the internal temperature uniformity caused by the heat convection in the working chamber.

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