Deviations of conducted disturbance voltages measured with AMN due to differences in height of the AMN and its grounding conditions

This paper describes the results of calculating and measuring deviations of conducted disturbance voltages caused by differences in the arrangement of an artificial mains network (AMN) used to measure the voltage, for example, the height of the (AMN) from a horizontal reference ground plane and the connection between the AMN and the ground plane. The results indicated that the conducted disturbance voltage can be underestimated when using an arrangement in which the AMN is set on a 40-cm-high non-conductive support as specified in CISPR 16-2-1 edition 2.0. The deviations increased as the frequency increased and the width of the grounding conductor became narrower. The largest deviations were observed when using a cable connection between the AMN and the horizontal reference ground plane. Resonance due to stray capacitances between the AMN and grounding conductor caused larger deviations. To minimize the deviations, these results should be taken into account when using the arrangement in which the AMN is set on a 40-cm-high non-conductive support.