Electrical connector under heavy vibration generating EMI: its laboratory repetition and analysis

This paper reports that the electrical connector loading current under heavy mechanical vibration can generate electromagnetic interference (EMI). The phenomenon is revealed by an accidental EMC test, and is confirmed in this paper with a series laboratory repetition made in both an open laboratory for direct measurement and a shielded chamber for radiation test. By means of wavelet de-noise and Fourier transform analysis, both experiments show similar measurement results and come to the conclusion that such EMI is caused by mechanical vibration which happens irregularly with similar characters under poor connection conditions.