Uncertainty analysis for conducted emission measurement

EMC measurements are inherently less accurate than most other types of measurement. Though the test houses are required to report or at least estimate their own measurement system uncertainty, there is no defined acceptable margin of uncertainty. In this paper a simple yet subtle technique to estimate the measurement uncertainty in conducted emission has been presented. The difficulty in calibrating line impedance stabilisation network (LISN) has been overcome by repeated measurement. Relevant measurement results have been presented. Overall uncertainty of conducted emission (CE) measurement has been estimated.