Very fast voltage rise curves due to gap discharge were examined discuss a EMI source. The measurement system consists of a distributed constant line system, because the voltage transients were ver rapid. A characteristic of the gap electrode, which has a matched impedance for the distributed constant line system, was investigated in the freqeuncy range below 5GHz. The voltages of power source in experiment were 510V and 800V bcause the Paschen's law holds stability in air condition. It was confinned that the measurement method enables to measure the high speed voltage rise curves of about 100ps.
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