Low-impedance operational characteristics of toroidal cores used in magnetic amplifiers

The need for knowing the low-impedance operating characteristics of a toroidal core or cores to be used in a magnetic amplifier operating under low-impedance control conditions is shown in this paper. A method is then presented for determining these low-impedance characteristics without first winding turns on the core. This method is presented for the edification of persons who are working on the development of new core-testing techniques.