The voltmeter described herein is capable of measuring the average amplitude of a single pulse with a random error of 0.2 percent of full-scale deflection. The instrument consists of a gated cathode follower bridge in conjunction with a ballistic indicator. In its present form the circuit responds to the average pulse amplitude over an arbitrarily selected interval of two milliseconds; thus, it measures the actual amplitude in the special case of a flat pulse of sufficient duration. The required input is 0.8 volt for full-scale deflection. The nonlinearity is less than 1 percent of any given deflection throughout the major part of the range of the instrument.
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