Test box protection measures

2018-09-17 17:43:43 1

The test chamber is used to dissipate a large amount of heat from a statically fixed temperature test product for rapid thermal cycling of the power product for many different purposes. Depending on the designated room, the task will not be performed correctly, and a pair of designated chambers will cost more than necessary. Each type of application requires the best performance of a different design room if it is to be implemented. The simplest is basically a heat with a heater insulation box and convection depending on the entire distribution chamber. Although the temperature does not exceed the volume of the Chamber of Commerce, even this is not necessarily important if only a single product is being tested to occupy a small portion of the room. The temperature is controlled by using a basic level/off temperature controller. Better temperature control can be controlled by using the ratio of the heater.

The test chamber makes it necessary to make full use of the more stringent temperature distribution within the chamber where it is needed. This can only be done more quickly by using air forced through the forced air circulation. Axial fans are lightly loaded, but higher pressure centrifugal fans are suitable for loading in densely populated conditions. The faster the air flow between the load increases and reduces the indoor air, so after the time of arrival, the heat stability of the heat transfer rate of the load. Some mean less than the ambient temperature of the laboratory that will need to be cooled. It is mechanical and cryogenic cooling. The mechanical system uses a refrigerant evaporative cooling compressor, and the heat exchanger chamber converts the gas back into a liquid in a closed loop to form a separate system. A typical single stage system will achieve a temperature drop of approximately -40 degC while a multi-stage cascading system is provided at lower temperatures. The cryogenic system also evaporates the liquid, but at the time the gas is released into the atmosphere, resulting in a simple but powerful system. Very low temperatures are easily achieved due to the low boiling point of liquid nitrogen at room temperature or the liquid carbon dioxide temperature used in these systems. However, special shipping storage and distribution arrangements are necessary for low temperature liquids and high operating costs.

The test chamber 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 amount of product that is past the air speed depending on its temperature above the surrounding air. Therefore, in order to test all products, it is important to achieve the same conditions to achieve even airflow distribution and uniform temperature distribution in the conference hall. A more powerful heat sink may also be required to remove power consumption from the product. The programmer is a need for a temperature loop application. This allows two or more temperatures to be set in advance at each temperature time together. In addition to the transition between temperatures, it can usually be specified and the total number of cycles required. It is important to load or remove the load during the thermal cycle. The air flow is evenly distributed so that all parts of the load are subjected to similar test conditions. Thermal stress is a design topic of a thermal cycle product that is well suited for special types of rapid temperature changes to mechanical stress chambers. This pressure leads to any inherent weaknesses, failures, 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 optimal thermal coupling between the required product and the indoor air means that the air speed is fast. A powerful circulating fan Therefore, thermal stress chambers and standard temperature cycling are basically not suitable for this purpose. In general indoor rooms should be fully seam welded and have good door seals to prevent air leakage. This helps to reduce heat loss at high temperatures and ensures that no humid air enters the cavity causing the low temperature frost to build up. Heat loss will be further reduced if the chamber has thermal efficiency between the rest time and the inner and outer chamber insulation. A stainless steel chamber is best protected against possible corrosion problems and is also compatible with cryogenic cooling. It is worth remembering that the test chamber usually needs to leave, so it must be fault protected in the event of a component failure. The American Chamber of Commerce should be protected from an independent over-war travel that fails control and should include protection against power and phase failure. The cooling and machinery plant should have additional pressure and thermal protection for the compressor system. The backup valve must be operated with a low temperature temperature to avoid the temperature being too low.

Of course the most important security features are those that protect the operator. Such as from the power supply voltage, and fully exposed to the Earth's bonding protection measures are mandatory according to the various EC directives and consistency is indicated by the CE mark. Measures may also need to protect operators who are overheated or cold. The latter is designed for cryogenic cooling chambers and is important. The test chamber can control an example of a power door lock by fitting the temperature.