An ultra-high-speed oscillograph

The paper describes the design and construction of an ultra-high-speed oscillograph for observing and studying the build-up of radio-frequency oscillations of a pulsed magnetron, and other phenomena in the millimicrosecond region. It has a linear sweep-speed of 2.5 cm/m¿s with a full scan of 5 cm. A special-purpose cathode-ray tube is incorporated having small plate systems. The Y-plate system is designed as a transmission line, which can be used as a resonant or non-resonant line, thus providing a means for narrow-band or broad-band matching. A unit containing short lengths of 70-ohm coaxial cable for delay purposes is included, and there is a calibrating circuit which provides a 1250 Mc/s timing waveform from a pulsed coaxial-line oscillator which also checks the linearity of the time-base.