The cyclic integrator ¿ A device for measuring the frequency response of magnetic amplifiers

THE increasing number of applications of magnetic amplifiers to automatic control problems has brought about the necessity of being able to measure and to describe analytically the performance of such amplifiers as a function of time, so that the designer is able to predict the stability of a control system in which they are used. The time function most useful in applying a magnetic amplifier to a closed-loop control system is its frequency-response characteristic which describes the action of the amplifier in terms of amplification and phase shift of a sinusoidal control voltage which is varied in frequency over some specified range.