Device and method for the contactless, precise measurement of the DC part in a mixed current

摘要

Apparatus (A) and method for the contactless measurement of the DC component in a mixed current of a conductor comprising a magnetic core probe (17) for detecting the AC component and the DC component in the mixed stream, an oscillator (3) for generating an excitation signal, a compensation unit (6 ) for generating a Kompensierstroms for inductive compensation of the AC component in the magnetic core probe and a phase locked loop (2), which is adapted to synchronize the phases of the excitation signal and the Kompensierstroms with the phase of the AC component in the mixed stream. To correct the nonlinear magnetic core probe signal, a linearization curve can be used which has been obtained by determining interpolation points and optionally subsequent interpolation.