As the dependence of the microcomputer is increasing, the massive use of equipment, complexity of our electromagnetic environment, so external interference such as impulse noise, radiation electromagnetic fields, static electricity, lightning, voltage variations, etc., triggered by the malfunction of the resulting machine or even the destruction of the situation, such as radio communications, radar, big brother, TV, musical instruments, etc., often interfere with the TV, and even cause the use of medical equipment in the use of malfunction, affecting the safety of the flight. The new technology is designed to provide a high level of performance and reliability, and is designed to meet the demands of the marketplace.
International for electronic, electrical, industrial equipment products, immunity testing is becoming increasingly important, and tends to integrate the IEC (International Electrotechnical Commission) international specifications for the test standard, Europe **** the same body to take the lead in the development of EMC prevention and control regulations in 1996, the full implementation of immunity testing. Distribution box made of metal, such as welding technology is not a problem (will not be deformed), the use of joints all welded way, if not all welded surface of the gap as small as possible. If the distribution box is assembled with screws, the contact surface paint must be scraped off in order to obtain better conductivity. Distribution box will inevitably open holes to do cable entrances and exits, radio waves will pass through these holes can not pass the test, so the openings should be minimized as much as possible, not used to the holes shall be made of metal to cover up the cover, metal to metal contact with the paint shall be scraped off, and shall be used in industrial environments with the conductive gaskets. Distribution box door in the closed, and the distribution box body contact surface, shall be used in industrial environments with conductive gaskets, so that they are in close contact, such as based on cost considerations can be used to distribute the compact spacing using a fixed screw lock. The door of the distribution box shall be left with the end point for grounding, and the grounding surface shall be paint-proof.