A magnetic-modulator-type current-dividing highly stable DC current transformer for large currents

descriptionPublicationkeyboard_double_arrow_right Article 01 Apr 1991 English Publisher:Institute of Electrical and Electronics Engineers (IEEE)Journal:IEEE Transactions on Instrumentation and Measurement, volume 40, pages 284-287 (issn: 0018-9456,

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Authors: M. Abe; H. Tsujimura; J. Nakazoe;

doi: 10.1109/tim.1990.1032939 , 10.1109/cpem.1990.110062

A magnetic-modulator-type current-dividing highly stable DC current transformer for large currents

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Abstract

A highly stable current-dividing DC current transformer system using a second-harmonic type of magnetic modulator has been developed for a several-hundred-ampere highly regulated current source which is required for nuclear magnetic resonance measurements. The system consists of a resistive current divider, two choke coils, and two magnetic modulator ampere-turn comparators, using relatively small cores, with feedback. The performance of the regulated current source was tested by setting the current supply to 200 A. A temperature drift of 3 p.p.m./ degrees C in the regulated output current was achieved. >

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