Proposed standards for core test methods for toroidal magnetic amplifier cores

One of the major problems in the production of magnetic amplifiers is reproducibility. It is essential that reactor cores of magnetic amplifiers be tested and selected prior to winding if good quality control is to be maintained. There have been many approaches to the problem and each company has its own test circuit. Realizing that it would be advantageous to both the core vendors and the users to standardize on core test methods, the Magnetic Amplifier Materials Subcommittee formed the Working Group on Core Matching and Grading to establish standard test circuits. This paper constitutes a summary of the Working Group´s activities over a 2-year period and sets forth recommendations for two standard core test circuits for toroidal cores.