1.Selection of Capacity

When placing the test product (components, assemblies, parts or the whole machine) into a constant temperature and humidity incubator for testing, in order to ensure that the atmosphere around the test product can meet the environmental test conditions specified in the test specifications, the working size of the climate chamber and the overall size of the test product should follow the principle that the volume of the test product should not exceed the effective working space of the test chamber（20～35）%The distance between the outer surface of the tested product and the wall of the test chamber should be maintained at least100～150mm.

2.Air cooling and water cooling options

Generally, air cooling is sufficient for constant temperature and humidity incubators, while large constant temperature and humidity chambers or high and low temperature rapid temperature rise and fall testing machines are commonly used for water cooling. Water cooling is more commonly used for cold and hot shock test chambers.

3.Temperature fluctuation

Temperature fluctuation is a relatively easy parameter to achieve, and most of the test chambers produced by environmental testing equipment manufacturers can control the actual temperature fluctuation within ±0.3Within the range of ℃.

4.wind speed

In order to ensure uniformity within the testing chamber, it is necessary to have circulating air inside the testing chamber. The wind speed inside the constant temperature and humidity incubator during environmental testing should be less than1.7m/sFor the experiment itself, the lower the wind speed, the better. If the wind speed is too high, it will accelerate the heat exchange between the surface of the test piece and the airflow inside the box, which is not conducive to the authenticity of the experiment. The wind speed limit varies for different usage purposes.