Cyclic integrator measures frequency response

THE time function most useful in applying a magnetic amplifier to a closed-loop control system is the frequency response characteristic. This describes the action of the amplifier in terms of amplification and phase shift of a sinusoidal control voltage, which is varied in frequency aver some specified range. This digest describes the equipment and a technique that have been developed to measure these characteristics. An analytical expression for the transfer function of a full-wave self-saturating magnetic amplifier is proposed on the basis of experimental data.