The peak voltmeter circuit to be described was developed to minimize the error encountered in measuring pulses of short duration and low repetition frequency. Essentially the instrument contains an automatic switch connected in series with a condenser and a high d.c. source (B‐supply). Closing of the automatic switch by an input voltage allows the high d.c. source to charge the condenser. As soon as the condenser voltage becomes equal to the peak amplitude of the measured voltage the automatic switch opens. The condenser voltage is coupled through a high input resistance circuit, bridge‐balanced cathode follower, to an indicating meter. High accuracy is attained over wide ranges.