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Method and apparatus for measuring the current flowing in a workpiece

  • US 4,059,798 A
  • Filed: 03/08/1976
  • Issued: 11/22/1977
  • Est. Priority Date: 03/08/1976
  • Status: Expired due to Term
First Claim
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1. The method of measuring the current flowing in a workpiece which comprises placing the workpiece inside a magnetic core, continuously inducing a plurality of damped, oscillatory-waveform magnetic fields in said magnetic core at closely spaced intervals so as to maintain the core at all times on an idealized magnetization curve essentially without hysteresis while said workpiece is present therein and current is flowing in the workpiece, and measuring by means of a flux sensor the magnetic field generated by the said current while said workpiece is inside said magnetic core and immediately after at least one of said induced oscillatory magnetic fields has been applied whereby the hysteresis effect present is minimized.

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