Abstract

A convenient test of the speed of response of an electrocardiograph can be provided by a very simple circuit. This provides an exponential pulse with a time-constant of 6.3 milliseconds and an equal voltage step. For a direct-writer which barely meets the minimum requirements of the American Medical Association the recorded amplitude of the pulse is approximately 50 per cent that of the step. If the tester is incorporated in the conventional calibration circuit, only a capacitor and a button switch need be added.

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