The test chamber is used to test the rapid thermal cycle of the product from the static fixed temperature, and the large amount of heat of the power product is dissipated for many different purposes. According to the designated chamber, the task will not be performed correctly, and a pair of designated chambers will cost more than is necessary. Each type of application requires different design rooms for optimal performance if to be achieved. The simplest is basically an insulated box with a heater and convection depends on the heat of the whole distribution room. Although the temperature does not exceed the chamber volume very much, even this may not be important if only a single product is being tested and occupies a small part of the chamber. Temperature is achieved by using a basic level / off temperature controller. Better temperature control can be achieved by using proportional control of the heater.

The test chamber makes full use of where it is necessary to make a stricter temperature distribution in the chamber. This can only be achieved by using forced air circulation to circulate the air more quickly. Axial flow fan is light load, but higher high-pressure centrifugal fan needs to be loaded properly in the case of dense population. Faster air circulation between the load increases and reduces the indoor air, so the time after arrival, the thermal stability and heat transfer rate of loading. Some mean that the laboratory will need to be cooled below the ambient temperature. Is to choose mechanical and low-temperature cooling. The refrigerant used in the mechanical system, the compressor for evaporative cooling, and the heat exchanger chamber convert the gas back to liquid in a closed cycle to form an independent system. A typical single-stage system will achieve a temperature drop of about - 40degc, while a multi-stage cascade system is provided at a lower temperature. The cryogenic system also evaporates the liquid, but the gas is discharged into the atmosphere, resulting in a simple but powerful system. Very low temperatures are easily reached due to the low boiling point of liquid nitrogen at room temperature or the temperature of liquid carbon dioxide used in these systems. However, special transportation, storage and distribution arrangements are necessary for cryogenic liquids and high operating costs.

The test box may disappear into the conference hall with a lot of power, which has two main roles to consider. The heat of the product will increase the number of products. The past air speed depends on its temperature higher than the surrounding air. Therefore, in order to test all products, it is important to use the same conditions to achieve even air flow distribution and uniform temperature distribution in the conference hall. A more powerful heat sink may also be required to remove the power consumption of the product. The programmer is the need for a temperature cycling application. This allows two or more temperatures to be preset at each temperature for time together. In addition, the transition between temperatures can usually be specified and the total number of cycles required. The load that must be put into or taken out in the process of thermal cycle is more important. The air flow is evenly distributed so that all parts of the load are subject to similar test conditions. The design of thermal stress chamber is very suitable for the rapid change of thermal stress of products. This pressure leads to any inherent weakness, failure, allowing substandard products to be screened and then shipped to the end customer. The temperature of the product must change rapidly, not just the surrounding air. Therefore, the best thermal coupling between the product and indoor air is required, which in turn means fast air speed. A powerful circulating fan, therefore, the thermal stress chamber and standard temperature cycle are basically not suitable for this purpose. In general indoor rooms, sufficient seam welding and good door seals shall be provided to prevent air leakage. This helps to reduce high-temperature heat loss and ensures that moist air does not enter the cavity causing low-temperature frost. Heat loss will be further reduced if the chamber has thermal efficiency between rest time and inner and outer chamber insulation. A stainless steel chamber is best to avoid possible corrosion problems and is also compatible with low temperature cooling. It is worth remembering that the test chamber usually needs to leave, so fault protection must be provided in case of a component failure. AmCham should be protected to control the failure of an independent overtemperature trip and should include protection against power and phase failure. The cooling and machinery plant should have a compressor system with additional pressure and thermal protection devices. The backup valve must be installed with the temperature travel at low temperature to avoid too low temperature.

Of course, the most important safety functions are those that protect the operator. For example, bonding protection measures from the power supply voltage and full exposure to the earth are mandatory according to various EC directives and consistency is indicated by the CE mark. Measures may also need to protect operators who are excessively hot or cold. The latter is designed for cryogenic cooling chamber, which is important. The test chamber can control the example of electric door lock by fitting the temperature.