MEASUREMENT OF VERY-FAST-VOLTAGE RISE CURVE DUE TO GAP DISCHARGE USING COUPLED TRANSMISSION-LINES IN DISTRIBUTED CONSTANT SYSTEM

A measurement method of very-fast-voltage rise curves due to gap disch arge using the coupled transmission lines was examined to discuss a el ectromagnetic noise source from a viewpoint of electromagnetic compati bility (EMC). The measurement system consists of a distributed constan t line system, because the voltage transients were very rapid, A chara cteristic of the gap electrode, which has a matched impedance for the distributed constant line system, was investigated in the frequency ra nge below 5 GHz, The voltages of power source in experiment were 510 V and 800 V because the Paschen's law holds stability in air condition, As a consequence of the experiment with this measurement system, the measurement method made it possible to observe the very fast rise curv es of about 100 ps.