Apparatus and method for measuring hysteresis characteristics in

Details Apparatus and method for measuring hysteresis characteristics in Apparatus and method for measuring hysteresis characteristics in

1992-02-06

1993-08-31

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Hysteresis loop curve display or recording

324626, G01R 3314

Patent

active

052412695

ABSTRACT:
Apparatus for measuring a hysteresis characteristic of magnetic material, dielectric material or the like in a high frequency range without using a high-speed A/D converter. A current having a predetermined frequency is applied to an object being examined 4 and the magnetic field and magnetic flux density in the object 4 are detected. The detection signals are successively subjected to frequency conversion with predetermined frequencies corresponding to a fundamental wave and harmonic waves by mixers 17, 18. The frequency-converted signals are input to bandpass filters 19, 20. The output signals of the bandpass filters, which are signals of an intermediate frequency, are converted to digital signals by A/D converters 25, 26, the apparatus thereby detecting the fundamental wave component and each higher harmonic component.

REFERENCES:
patent: 2934696 (1960-04-01), Williams et al.
patent: 3238449 (1966-03-01), Gordon et al.
patent: 4044302 (1977-08-01), Mayberry
patent: 4463313 (1984-07-01), Steingroever et al.
patent: 4573012 (1986-02-01), Bisson et al.
patent: 4623841 (1986-11-01), Stinson et al.
Yoshifumi Sakurai, "Magneto-Ceramics", Ohm Company 1980, pp. 202-227.
M. Kido, "Know-hows for measuring high frequency characteristics of magnetic materials", pp. 300-311, Nikkei Electronics, No. 483, published Sep. 28, 1989.

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