How to choose the right temperature and humidity Test Chamber?

The optional temperature and humidity Test Chamber should be selected from five aspects: volume, temperature range, humidity range, control mode and temperature change rate.

1. Select amount

When placing the test product (component, component, assembly or complete machine) in a climate chamber 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 product to be tested The following points should be noted between the dimensions:

a) The volume (W× D× H) of the product under test shall not exceed (20~35)% (20% is recommended) of the effective working space of the test box. For products that generate heat during testing, it is recommended to use no more than 10% of the product.

b) The ratio of the windward area of ​​the test product on the section to the total area of ​​the Test Chamber does not exceed (35 to 50)% (35% is recommended).

c) The distance between the outer surface of the product under test and the Test Chamber wall should be at least 100~150mm (150mm is recommended).

The above three points are actually interdependent and unified. Taking a cubic box of 1 cubic meter as an example, an area ratio of 1:(0.35 to 0.5) corresponds to a volume ratio of 1:(0.207 to 0.354). The ratio of the volume to the volume 100 to 150 mm from the tank wall is 1: (0.343 to 0.512).

To sum up, the above three points stipulate that the volume of the working chamber of the climate environment Test Chamber should be at least 3 to 5 times the external volume of the product to be tested.