How should we choose the volume when purchasing an environmental test chamber?

When the tested product (components, components, parts or whole machine) is placed in a constant temperature and humidity test chamber for testing, in order to ensure that the surrounding atmosphere of the tested product can meet the environmental test conditions specified in the test specification, the working size of the climate chamber is different from that of the test chamber. 

The following rules should be followed between the outer dimensions of the tested product: 

1. The volume of the tested product (W×D×H) shall not exceed (20-35)% of the effective working space of the test chamber (20% is recommended). It is recommended to use no more than 10% for products that generate heat during the test. For example, when a 21` color TV is doing a temperature storage test, a test box with a volume of one cubic meter can meet the requirements, but when it is powered on, it cannot meet the requirements, and a larger test box should be used. , because the TV emits heat when it is working. 

2. The ratio of the windward section area of the tested product to the total area of the test chamber working room on the section is not greater than (35-50)% (35% is recommended). Multiple samples should be placed on the same plane as much as possible. 

3. The distance between the outer surface of the tested product and the wall of the test chamber should be kept at least 100-150mm (150mm is recommended). The sample placement should not block the air outlet and return air outlet, and a certain distance should also be reserved for the temperature and humidity sensor. to ensure the correct test temperature. The above three-point provisions are actually interdependent and unified. Taking a cube box of 1 cubic meter as an example, the area ratio is 1:(0.35~0.5), which is equivalent to the volume ratio of 1:(0.207~0.354). 100～150mm from the box wall is equivalent to a volume ratio of 1:(0.343～0.512). 

At the same time, the following items are also worth paying attention to: 

1. The temperature range, the temperature range of the equipment can be analyzed from the reference maximum and minimum temperature values. 

2. Cycle function, whether the device has a temperature cycle function can be analyzed from the repeated cycle switching curve cycle between temperatures. 

3. Humidity range, whether the device has the function of humidity, and the temperature range should be considered. 

4. Thermal load, generally, electronic products are more subject to power-on test. In the case of power-on, the tested product will definitely heat up, which will generate load. 

Therefore, in the process of buying equipment, you must pay attention to the manufacturer's instructions. load condition. 

5. For equipment handling, refer to the overall dimensions of the equipment to determine the final arrangement of the equipment. 

6. The power supply, whether the power of the equipment can match the final power supply of the laboratory. More about: constant temperature and humidity box

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