Evaluation of Ferroxcube Cores

Abstract

A 1000-core lot, Ferroxcube 170T025A402, was evaluated to determine its usefulness as memory core. The squareness and signal ratios of this lot were excellent. Its uniformity was good. The switching time of this lot, however, was longer than the switching time of General Ceramics' cores. These cores became disturb sensitive at about 900 ma and appeared to be extremely sensitive to temperature changes. They might be satisfactory (i.e. not disturb sensitive) at lower operating currents, but the longer switching time and the temperature sensitivity rule them out for our application.