Mismatch Correction by Measurements of Conducted Radio Disturbances With AMN

Abstract

Conducted radio disturbances at a power port of the equipment under test (EUT) are sensed with the artificial mains network (AMN) and transmitted via the 50- coaxial system to the measurement receiver. The voltage division factor of the two-port network between the EUT port of the AMN and the receiver input is defined by neglecting a mismatching. As a matter of course, the mismatch correction factor appears. It depends on all components of the path, including the AMN. This fact is ignored in Comité International Spécial des Perturbations Radioélectriques 16-4-2 document. Due to the reflection at the receiver input, whose only the extreme is usually available in the technical specification, the mismatch correction factor cannot be determined. Its estimate is built-in into the measurement uncertainty budget. Two approaches for the estimation of the mismatch correction factor by the divided and the integrated measurement path are derived. The estimations are illustrated with numerical calculations by Monte Carlo method. The distinction of the mismatch correction factor by conducted disturbances from radiated disturbances, as well as recommendation of the approach with the integrated path, constitute the essence of the paper.