Automatic Testing System for Emc Testing with Wavelet Analysis Application Baded on Labview

Abstract. According to the problem that the speed of electromagnetic compatibility(EMC) manual system is slow, a automatic testing system is designed for power supply line conducted emission based on general-purpose interface bus(GPIB) and LabVIEW, which actualizes a series of functions, such as signal generating, monitoring, analyzing and showing. It introduces the constituting of system, testing principle, software structure, and solves the hard problems and key techniques such as hardware’s controlling, algorithm’s fast convergence, compatibility of software. Because the testing signal include the ambient noise, the wavelet analysis is applied to filter the noise and gain the real conducted electromagnetic interference. Comparing with the other traditional apparatuses and the manual testing, the system improves the test efficiency and has good extensibility.