Abstract: A rapid-response generating voltmeter for measuring a high d-c voltage between a high voltage electrode and ground comprises two sets of stator segments, the segments of each set being electrically interconnected and each set being connected through its own capacitor to ground. Each set of stator segments has a time-varying capacitance with respect to the high voltage electrode, but the sum of these time-varying capacitances is maintained substantially constant with time.First and second circuit means respectively sense the voltages e.sub.1 and e.sub.2 present across said two capacitors and develop first and second intermediate signals e.sub.5 and e.sub.6 substantially proportional to e.sub.1 and e.sub.2, respectively, minus, in each case, an error voltage attributable to discharge of the associated one of said capacitors. Summing means develops an output signal substantially proportional to the instantaneous sum of e.sub.5 and e.sub.