An accurate electronic tracer for dynamic characteristics of magnetic materials

THIS equipment makes possible the accurate determination of dynamic magnetic characteristics needed for advanced magnetic amplifier design. The hysteresis loop and the time functions of H, B, and dB/dt can be either measured point by point or continuously recorded on an x-y recorder by means of an automatic electronic a-c compensator which transforms the a-c signal for any given time instant into an equivalent direct voltage. An over-all accuracy of 1 per cent is possible for operating frequencies between 50 and 1,000 cycles per second (cps). The instrument is valuable not only for studying the dynamic characteristics of magnetic materials but also for the evaluation of other nonlinear circuit elements like rectifiers, transistors, and ferroelectric capacitors.