Circuit for Rapid Determination of Resolving Power and Other Characteristics of Coincidence-Systems

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Abstract
A simple device is described in which pairs of pulses are produced that are moved continuously with respect to each other (wobbled) by an a.c. voltage that also sweeps an oscilloscope spot horizontally. The pulses are applied to both inputs of a coincidence system. Vertical deflection of the c.r. scope spot is caused by the output pulses of the system. Thus various characteristics can be made visible and the resolution can be read from the scope screen at a glance. With the instrument resolving powers from 3.10−6−10−9 sec. approx. can be determined. The apparatus was calibrated by feeding the wobbling pulses into a radio receiver. The output of the receiver has a sharp minimum when the pulse distance (Δt) satisfies the condition Δt=(1+2n)/2ν where n is an integer, ν is the frequency to which the receiver is tuned.

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