A universal estimating and measurement method of EMI

EMI testing is usually hired professional testing the measuring unit. But this method has some detects, such as the high cost, a long period and do not provide the distributing graph of frequency points and position. Using electromagnetic theory, Neumann formulas and Maxwell equations, a general estimate of the value of EMI testing method is presented in this paper. Oscilloscope, HF magnetic ring induction coil and a small number of testing electrical components and materials are introduced, and then using the interactions between the high frequency magnetic ring induction coil and testing circuit, the EMI is measured indirectly. EMC design can provide sufficient anti-electromagnetic interference measures. It is proved that the method is correct and feasible by the experiments results and the state administration of Radio and TV Detection Center.