The Magnetic Behavior of Iron in Alternating Fields of Frequencies between 100,000 and 1,500,000 Cycles

Mild steel ribbon, 0.002 inch (0.05 mm.) in thickness, was tested at various radio frequencies between 100,000 and 1,500,000 cycles per second for the relation between ampere turns per centimeter and flux density, and for core loss in watts per cubic centimeter at the various frequencies. A vacuum tube oscillator supplied the necessary current for magnetizing the ring samples of steel. The method of measurement required the development of a precision radio frequency voltmeter, which is described in detail. All the results obtained are shown in graphic form.