Direct Sampling in Multi-channel Synchronous TDEMI Measurements

Abstract

This paper shows possible benefits of multi-channel synchronous time-domain electromagnetic interference (TDEMI) measurements. The setup was developed with respect to low-frequency conducted Electromagnetic Interference (EMI) measurements in high power, fast switching systems using a low-cost solution. Using an 8-channel digitizer voltages, currents and magnetic fields were simultaneously recorded. Using digital signal post-processing investigations were performed on the relation between switching currents and magnetic fields, while also investigating the time variance of the load impedance.