DESCRIPTION The Tektronix Type 513D is a portable，self- contained，precision instrument specifically designed for displaying a plot of the variations with respect to time of a voltage pulse or wave, with self-contained means of measuring its duration and magnitude. It is primarily intended for study of short duration pulses. It features a 5XP type cathode-ray tube with an accelerating voltage of 12KV, making it particularly useful where a high writing rate is required，or where it is desired to photograph single high speed sweeps. This handbook describes its characteristics, basic principles, operation and maintenance.