Fast Magnetic Emission Tests for Continuous Measurements Around an Equipment Under Test

For the assessment of radiated electromagnetic interference (EMI) emission of an equipment under test (EUT) traditionally a limited amount of positions around the EUT are chosen. This is due to the long measurement time per position of the EMI test receiver, although the introduction of time domain electromagnetic interference (TDEMI) analyzers already created serious reduction in measurement time. The limited amount of measurement positions around an EUT means however that the maximum interference can be missed at certain positions around the EUT, creating an underestimation of the maximum emission. With the use of a low cost baseband digitizer this paper realizes a continuous positional measurement around an EUT. This measurement presents the maximum emission of the interference by considering every position around the EUT.