Abstract:

Fundamental theory judging by electromagnetic compatible, electromagnetic susceptibility and ego specifically for communication measures an instrument defend condition, new technique applying EMC (ElectroMagnetic Compatibility ) to develop in process in realization, Take that the basic testing demands and the electromagnetism environment of the Analog working as the main body,Measure having studied system, system inner shield. Structure, Shield way, component keep apart, problem such as, PCB（Printed Circuit Board）component preparation by screening proposes that systematically to physics in equipment to resolve a scheme. To communication the instrument designs that the antiinterference ability of element has had very big improvement effects basically.

Key words: electromagnetic compatibility, electromagnetic susceptibility, interference suppression, shielding effectiveness, immunity level surge protective devices