Flux resetting characteristics of several magnetic materials

EXPERIMENTAL data are presented on the rate of change of flux in four materials used in magnetic amplifiers. A test circuit which applied a constant magnetizing force to a test core was employed.1 The rate of change of flux was then observed as the induced voltage in a pickup coil. By observing the induced voltage wave on an oscilloscope, one can determine the peak and average rate of change of flux, along with the wave shape as a function of time. This information is helpful in understanding and improving the performance of magnetic amplifiers, as will be discussed later.