Composite cores for instrument transductors

It is shown that, whereas the m.m.f. gain of a transductor without self-excitation is almost independent of the properties of the core, that for a transductor with 100% self-excitation is determined to a large extent by the shape of the magnetization curve of the core material. By combining in one core materials of different properties, it has been found possible to produce a relatively inexpensive core suitable for use in instrument transductors.