1. The structure of the constant temperature and humidity test chamber greatly affects the uniformity of the temperature in the working process. Because the structure is difficult to be completely symmetrical, it will adversely affect the uniformity of the temperature. Commonly used low temperature test box or constant temperature and humidity test box structure has the door in the front, the air-conditioning room is at the back of the box, and the upper air is supplied and the lower air is returned.

2. There must be test samples in the constant temperature and humidity test box during the test. If the test sample is too large or placed in an improper manner, the air convection will be blocked and the temperature uniformity will be deviated.

3. Because the heat transfer coefficients of the six sides of the front, back, left, and right sides of the chamber of the studio are different, the design of small details such as threading holes, inspection holes, and test holes will cause local heat dissipation and heat transfer, which makes the equipment box There is uneven temperature, and the convective heat transfer of the box wall radiation will also be uneven, which affects the uniform temperature.

4. Design problems make it difficult to achieve a uniform symmetrical structure in the internal structure and space design of the test box. The asymmetric structure of the temperature and humidity test box will inevitably lead to deviations in the internal temperature uniformity. This level is mainly reflected In terms of sheet metal design and its treatment, such as the design of the air duct, the placement of the heating tube, the size of the fan power and other reasons.

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