An Automatic-Slideback Peak Voltmeter for Measuring Pulses

An automatic-slideback-type vacuum-tube voltmeter designed for measuring the peak voltage amplitude of recurrent video pulses is described. The slideback is made automatic through the use of a suitable amplifier and rectifier, the output of which is used to bias off a diode to the peak amplitude of the pulse to be measured. The effects of wave form and duty cycle of pulses on the accuracy of the device are considered, as well as modifications which can be used to decrease the inherent error due to diode capacitance. In addition, means of extending the voltage ranges and increasing the input impedance are discussed.