Electromagnetic interference from electric arcs in the frequency range 0.1-1000 MHz

The electromagnetic interference /EMI/ from various forms of electrical discharges was investigated, and the measured levels were compared with civilian and military statutory limits of interference. The more stable arc forms, such as moderate-current (50-250A) arcs in argon flow, gave low levels of EMI conforming with all statutory limits throughout the frequency spectrum (0.1-1000 MHz). The interference from high-frequency/high-voltage spark discharges, used for arc initiation, was found to exceed statutory limits if used on a continuous basis.