Abstract
The problem of determining the magnitude distribution of fast rising voltage pulses is of frequent occurrence. A method is described by which such pulse height spectra may be obtained by photographing a cathode-ray oscilloscope display, in which the only tops of the pulses appear on the screen. The time base is switched off and the exposure is adjusted to permit the film to integrate the blackening due to a large number of individual pulse tops. The density variation on the film may be shown to be closely related to the pulse height spectrum and may be obtained from a densitometer measurement. Full details are given of the circuits used to obtain such a display, together with a summary of the applications to which the technique is particularly suited.