Metrological analysis of a high current measurement system

This paper presents a study about a high current measurement system. This system is used to measure a high pulsed current with precision. A metrological analysis was begun to determine the real precision and the limitations of this system. In the first part of the paper, the measurement principle, based on the inductive effect, is presented. In the second part, the metrological process is presented and the reasons of this analysis are explained. The main limitations of this system are described in the third part. These main limitations depend on the current probe positions and the choice of the numerical algorithm used to analyse the recorded electrical signals. Finally, we can measure a six megaamperes pulsed current with a precision of /spl plusmn/5% in using this metrological study and a new calibration of the system.