A subnanosecond voltage divider on coupled lines

The divider consists of two electrically and magnetically coupled coaxial lines inserted one into the other and having a single common outer conductor. One is an oil-filled line transmitting the main high-voltage pulse, and the other is a low-impedance measuring line, whose input is connected through a cable to the input of an oscilloscope. The experiment has confirmed the calculated division factor of ∼300 and a reproduction of the shape of the recorded pulse by the divider without distortions. The divider was used for recording bipolar pulses with ±120-kV amplitudes, a duration of ∼0.8 ns, and a rise time of ∼0.2 ns.