Although catalog values or the maximum permeability of head materials such as 4-79 mo-permalloy are about 300 000 µ0., the practical values for initial permeability at 1000 Hz for thin laminations bonded together into a head core are more nearly 5000 µ0 to 10 000 µ0. The initial permeability of a toroid or a "gapless" head may be calculated from physical dimensions and an inductance bridge measurement. The Maxwell bridge with a variable capacitance works especially well.

Author: McKnight, John G.
Affiliation: Magnetic Reference Laboratory, Inc., Mountain View, CA
AES Convention: 57 (May 1977) Paper Number: 1265A
Publication Date: May 1, 1977

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