Setup for the Calibration of Current Measuring Systems Under DC Signals Affected by Ripple

Traceability for AC Ripple Over DC Current

“…1) with a second Clarke-Hess 8100 trans-conductance amplifier (DC-COMP), driven by a second calibrator, the Fluke 5700A. The harmonic distortion of the secondary current, in particular the amplitude of the second harmonic, has been used as control variable to minimize the DC magnetic flux (full description in [16]).…”

“…The decoupling transformer requires high metrological performances to guarantee the traceability for the AC ripple. An archetype has been realized and presented in [16]. In this paper, a new prototype of the DeT has been designed and implemented with improved metrological performances.…”

“…Fig. 8 provides a comparison among three different magnetic materials: the common silicon iron that shows a high permeability but at a high magnetic field (hundreds of A/m), mu-metal which has been used for the realization of the archetype described in [16] and a wrapped noncrystalline iron-core with high relative permeability (about 50000) at low magnetic field. This material allows to have high magnetization impedance Z p (hundreds of ohms) with a limited number of turns.…”