Assessment of the high frequency emissions of low-voltage electronic equipment under different supply conditions

Assessing the emissions of low-voltage electronic equipment in the high frequency (HF) range (2-150 kHz) is an important ongoing research topic required to better understand the long term implications of HF distortion. Such studies can be conducted by supplying the load directly from the Mains network, from a programmable Power Source or via a defined impedance stabilization network. However, a standardized measurement procedure and source specification is still missing in literature. This paper presents a comparative study of background voltage distortion and emitted currents of two different electronic loads using the three different measurement set-ups deemed suitable for assessing the HF emissions of electronic equipment. The results highlight the difficulties in systematic testing of HF distortion and show that the supply configuration has considerable impact on the obtained results.