As a result, the immunity level of any electrical equipment which has been certified to have satisfied an EEC directive may not be
sufficient in the environment described. Similarly, any proprietary electrical equipment which is being designed for use in the power industries will have to take account of the higher interference fields. In short, the microelectronics circuitry will be subjected to unusually high interference fields and appropriate measures will be required to assure that secondary and auxiliary systems are electromagnetically compatible with the primary system which includes the switchgear. Appropriate measures can only be taken if the magnitude-frequency spectra of the radiated interference are available or are predictable. At present, measured data on the magnitude-frequency spectra are very scarce, as are computer codes for the prediction of pulsed radiation from large power systems.. These deficiencies are being addressed by the authors and it is considered pertinent that a good understanding of the behavior of a relatively well defined system is first achieved. The present paper is a continuation of a previous report concerning the E- dot and H-dot measurements obtained from the study on a point/plane SF5 gas gap, which was stressed to breakdown across the output of a High Voltage impulse generator. Further investigations have been made including numerical analyses to acquire F and /f field results from the measured F-dot and /l'-dot data.