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This article is reprinted from http://www.sq-test.com/. The rain test chamber, also known as a box-type rain test chamber, features a box-shaped structure and is used to conduct IPX3 and IPX4 waterproofness tests on product enclosures. It is of great significance for testing the waterproof protection properties of military products, automotive electronics, and household items. In terms of structural design, the test chamber of the rain exposure test chamber is made of high-quality stainless steel, and the sample racks are also constructed from stainless steel, offering corrosion resistance and ease of cleaning. The cabinet is coated with electrostatic spraying, offering a uniform color tone that is elegant and attractive. It is equipped with test power supply insertion holes to facilitate electrical testing of the samples. Its unique balanced temperature regulation method enables the device to have a stable heating capacity, allowing for high-precision and highly stable constant temperature control. For the temperature control section of the equipment, an intelligent temperature controller is used, with PID automatic adjustment for high precision and stability, ensuring accurate control of the equipment. It features over-temperature protection, audio alerts, and a timing function; when the timing expires or an alarm is triggered, it automatically cuts off the power supply to stop the device from operating, thereby ensuring the safety of both the equipment and people. We know that the rain test is primarily used to determine: the effectiveness of the protective cover or casing in preventing water leakage ； The ability of the equipment to meet its performance requirements during or after exposure to rain ； Physical damage to the equipment caused by rain, as well as the effectiveness of the rainwater drainage system. The rain exposure test is generally carried out in a rain exposure chamber; it is suitable for artificial rain exposure tests based on natural conditions, involving rainfall without high wind speeds, and does not take into account the large amount of water ingress caused by the high temperature of the sample and the temperature difference between the rainwater. The car rain test is an essential part of the production process in this industry. It involves water flowing into the vehicle from the outside, through the gaps in the vehicle’s structure. Vehicle manufacturers use artificially simulated rainfall environments to conduct rainproof sealing performance tests. Currently, domestic automobiles generally use the GB/T test methods for the rainproof sealing performance of buses, as well as the QC/T limits regarding the rainproof sealing performance of buses; the standardized version resulting from these integrations and revisions is the QC/T limits and test methods for the rainproof sealing performance of buses. In accordance with GB/T requirements, the rainfall intensity in the rain test chamber is 4–10 mm/min, the spraying pressure of the nozzles is 69–147 kPa, and the rain exposure time is 15 minutes. In actual operations, in order to enhance the inspection of the vehicle’s rain-sealing performance, car manufacturers often increase the intensity of the rain simulation by raising the water spray pressure, for example by increasing the density of nozzles. The rainfall intensity in such test chambers is several times higher than the recommended values; some manufacturers even achieve levels of 100 mm/min, with the nozzle spray pressure exceeding 200 kPa, thereby causing the water to be atomized and fall onto the vehicle body. At different stages of vehicle production, automakers have varying test requirements for the vehicles. During the vehicle’s trial production phase, since the manufacturing processes and equipment parameters are still under testing, it is necessary to conduct prolonged rain exposure tests on the complete vehicle (for 4–8 hours) in order to identify potential areas where leaks may occur. Subsequently, an analysis of the causes of these leaks is carried out, followed by improvements to the design or manufacturing processes. During mass production of the vehicle, design and manufacturing defects are generally resolved; during rain testing, routine inspections are carried out to prevent sealing issues arising from occasional non-conformities.