EMI (electromagnetic interference) is interference generated when an electronic device works near an electromagnetic field in the radio frequency spectrum (RF) generated by another electronic device. The internal circuits of personal computers generate electromagnetic fields in the radio spectrum. In addition, the cathode ray tube display also generates a broadband electromagnetic field. These radiations will interfere with the work of sensitive radio receivers nearby. If you have any kind of radio receiver and use it when operating a personal computer, you may hear radio frequency noise generated by the computer system in the receiver. Medium-energy or high-energy radio transmitters can generate strong enough electromagnetic fields to interfere with the normal work of nearby electronic equipment. If you live near a radio station or in the downtown area of a big city, you may have experienced electromagnetic interference from radio or TV transmitters. In strong RF areas, cordless phones, home entertainment systems, computers and some media devices may all stop working. By ensuring that all electronic equipment operates on a good electronic grounding system, the problems caused by electronic interference can be minimized. In addition, peripheral devices connected by ropes or cables in electronic equipment or computer systems should be shielded to prevent unnecessary RF energy from entering or leaving if possible. Special components, such as line filters, capacitors and inductors, can be installed on high-energy wires and interconnection cables to reduce the magnetization coefficient of electromagnetic interference in some systems. Please contact the manufacturer for technical consultation before making any modification to the equipment. This item is particularly important when the modification may invalidate the existing warranty, and it is essential when the medical equipment is modified. Name = electromagnetic pulse name = electromagnetic pulse site = category = common computing term def =
Electromagnetic pulse (EMP) is a sudden and violent burst of electromagnetic (EM) energy, accompanied by a large increase of particles (usually electrons). Electromagnetic pulses can include most of the energy components of the electromagnetic spectrum, from low-frequency broadcasting to ultraviolet wavelengths. Lightning will produce local EMP and strong current in nearby lines. Current surges can damage sensitive hardware, such as computers and peripherals. All electronic and communication systems should have some protective measures to prevent the influence of electromagnetic pulse. Transient suppressors, also known as pulse protection, AC sockets and modem sockets, provide limited electromagnetic pulse protection during thunderstorms. The best way to protect your computer is to unplug the computer's AC cable and modem cable when not in use. The explosion of high-energy hydrogen bomb will produce powerful EMP in a large geographical area. This will cause the current in wireless antennas, telephone lines and other useful wires to be destroyed. The use of strategic nuclear weapons in these areas is aimed at destroying communication and/or electronic infrastructure. Such weapons are called electromagnetic bombs.