Automated measurement of intermittent signals using a time-domain EMI measurement system

Abstract

Traditionally emission measurements are carried out in frequency domain using pre-and final scans. Time-domain EMI measurement systems allow to reduce the scan time by orders of magnitude, enabling novel test methods. In this paper the measurement uncertainty for intermittent signals during preand final scans is investigated. The effect of the dwell time on the measurement accuracy in the peak and quasipeak detector modes is shown. For conducted emission measurements two test procedures are presented. First method that performs a separate evaluation according to the phase of the LISN, and a second method that performs full maximization. Both methods are used for automated measurement of intermittent and narrowband drifting signals. The total test time is reduced by at least one order of magnitude. Intermittent and narrowband drifting signals, which are still measured today manually, can be measured by the presented procedure automatically. Measurements have been carried out in the frequency range 9 kHz -1 GHz.

Far Field Prediction From Near Field Using the Plane Wave Spectrum Method

“…This resulted mainly from the high level of integration of embedded electronic systems in a confined space together with the increasing of operating frequencies and the switching speeds in high performance modern equipment such as: mobile phone, electric engine and automotive vehicle, etc. [7,8]. Hence, all of these factors tend to increase EMI and generate undesired currents peaks or voltages in certain parts of the integrated system which could cause equipment to malfunction or failure.…”