A Multi-mode Noise Reference Source for Verifying Different Conducted Emission Setups

This paper describes an improved reference source for conducted emission (CE) testing. It allows for selecting different modes of noise injection. It injects an arbitrary waveform generator signal into a 3-wire power cord. Different from the previous designs, the noise can be injected in four different modes: Line against Neutral; Line against PE; Line and Neutral against PE; and Line, Neutral, and PE against Local GND (i.e., common mode). The source was designed for comparing test setups, and investigating the influencing factors such as table position or cable routing on the resonances.