EMC measurements in the time-domain

In this tutorial presentation, broad-band time-domain electromagnetic interference (EMI) measurement techniques are discussed. Time-domain EMI measurement systems are based on broad-band analog-to-digital conversion and subsequent real-time digital processing of the EMI measurement signals. This allows us to reduce the measurement times by several orders of magnitude. Modern time-domain EMI measurement systems for frequency bands up to 18 GHz and their principles of operation are presented. Like conventional EMI receivers, time-domain EMI measurement systems facilitate the measurement of average-, rms, peak-, and quasi-peak values of the EMI. Additionally, time-domain electromagnetic interference measurement systems allow measuring phase-spectra, short-time spectra and to performing statistical analysis of the measured signals.