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a device for measuring the magnetic characteristics—usually the magnetization curve and the hysteresis loop—of ferromagnetic specimens having a simple form, such as straight rods, strips, or tubes. It consists of a frame or yoke made of a magnetically soft material and is generally provided with movable parts or pole pieces, which clamp a test specimen in such a way that the specimen forms a closed magnetic circuit with the yoke—it is simpler to determine the magnetic characteristics of a specimen in a closed circuit. A place is provided on the yoke for magnetizing coils and devices for measuring the magnetic induction B and the magnetic field strength H in the specimen.
One type of permeameter whose operation is based on the ballistic method of measurement is shown schematically in Figure 1. The induction B in a specimen is determined by means of a measuring winding connected to the ballistic unit. The strength H is measured by means of a magnetic potentiometer that is connected to the same unit. Field strength can be measured by other means as well, such as Hall transducers, ferromagnetic probes, and magnetic bridges. Other means for determining induction include the use of Hall transducers at the end of the specimen and electrodynamic methods. The magnetic permeability μ of the specimen material is found from the ratio μ = B/H.
REFERENCESKifer, 1.1. Ispytaniia ferromagnitnykh materialov, 3rd ed. Moscow, 1969.
Chechernikov, V. I. Magnitnye izmereniia, 2nd ed. Moscow, 1969.
Bozorth, R. Ferromagnetizm. Moscow, 1956. (Translated from English.)
I. I. KIFER