Development of a Measurement Apparatus for Conducted Electromagnetic Emissions

Due to the intensive dissemination of high frequency electrical and electronic systems nowadays, several issues regarding electromagnetic interference (EMI) are more and more observed in our environment. This continuous growing of EMI everywhere, can leads to a malfunction of the more susceptible electrical products and systems. In order to face this problem, one has to take into account the various aspects of electromagnetic compatibility during the design phase of electrical and electronic systems. Among the tools that can be used for this purpose, there is the impedance stabilization network (LISN) and the noise separator device. With such tools, it is possible to carry out a series of EMI measurements in the prototype phase of the product, avoiding a fail in the final test of conducted electromagnetic emissions. This paper describes the development of a low-cost LISN with support for a noise separator device, which can provide valuable information regarding common-mode and differential-mode electromagnetic noise, allowing to solve more easily EMI issues on a product or system.