The transformer bridge and magnetic susceptibility measurement

Abstract

An improved transformer bridge for the measurement of low field susceptibility of rock specimens has been developed at the CSlRO Division of Mineral Physics. Design features include a low operating frequency which effectively eliminates errors due to conductive rock specimens, and minimisation of sensitivity to thermal changes and mechanical shock. Ergonomic features include a convenient facility for removal of remanent magnetisation of the transformer cores, an overload indicator eliminating the possibility of erroneous readings from this cause, and ready measurement of both in-phase and quadrature components of the signal, which allows the specimen conductivity to be inferred.