http://www.emchome.net/message.php?action=view&commentid=3848 Electromagnetic Compatibility (EMC) small family
EMC Electro MagneTic Compatibility is electromagnetic compatible, that is, a device is working in an environment with other devices, which does not generate an interference signal affecting other devices, while also resisting other equipment generated interference signals. . EMC is divided into EMI and EMS: EMI Electro MagneTic Interference refers to an external interference signal generated by an electronic device. If the interference signal is small, it is the device EMI performance! EMS refers to electronic devices to resist external interference signals. If it is possible to work properly, it is not affected by the interference signal, that is, the EMS performance of the device is good!
Electromagnetic Compatibility Analysis (EMC) refers to a radio communication device or system that does not have other devices in a public electromagnetic environment, which will neither produce neither of the same environment. Unacceptable communication quality caused by electromagnetic interference, in order to coexist and evaluate the technical analysis calculation of its coexist ability. The electromagnetic compatibility analysis in the spectrum management is based on the spectrum resource database and the station database. It is based on the three-dimensional geographic information system. By selecting a reasonable radio wave propagation model, the computer system is used to complete a large amount of complicated and cumbersome radio field strong predictions. Analysis, cover area analysis, interference analysis, frequency assignment, frequency and station coordination, and boundary coordination analysis calculation work, reach reasonably assigning radio frequency, reducing interference between stationary stations, and improving radio spectrum usage efficiency .
The EMI interference source is generated by a device for power conversion by a switching power source, an inverter, or the like, such as a general electronic device. High frequency interference is mainly generated by the source of cycle signals such as crystal, and the faster the rising edge, the greater the interference possibility. The above is the two most easily found interference sources, and some unregistered interference sources such as interference generated by secondary tube shutdown, difficult to say clearly. Different equipment is very different, and only summarize in practice. The input filtering circuit should be the best solution, because it will improve anti-interference while resolving internal outwards, don't think of a lot of high-strokes to solve their own interference results, I can't resist others. .
