Quantification of the artificial mains network impedance contribution to the uncertainty of conducted emission measurements

Non-reproducibility of conducted emission measurement due to the deviation from the nominal value of the artificial mains network impedance is here analyzed and quantified. Mean, standard deviation and coverage intervals are derived for the magnitude of the disturbance voltage developed across the input of the receiver. It is demonstrated that the width of the coverage interval depends on the domain spanned by the input quantities to the measurement model, namely the impedance of the artificial mains network and the impedance of the equipment under test. Different degrees of severity, determining a narrower or wider coverage interval but always corresponding to a coverage probability of 95 %, are identified.