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Strategies for precompliance measurements using the TDEMI measurement system

A low-cost EMC precompliance test-set is essential to reduce the development costs of any electrical device. In this paper we discuss the advantages of broad-band time-domain precompliance measurement technique applied to all types of electromagnetic interferences. The digital signal processing of EMI measurements allows emulating in real-time the various modes of conventional analogous equipment, e.g. peak-, average-, RMS- and quasi-peak-detector mode. Since time-domain techniques allow processing the whole amplitude spectrum in parallel, the measurement time may be reduced by at least one order of magnitude. Precompliance measurement results obtained with the time-domain electromagnetic interference (TDEMI) system for conducted and radiated emissions and detailed statistical signal descriptions of all classes of electromagnetic interferences are discussed.