In this paper, experimental works and theoretical analysis are presented to analyze
the influence of the conductor permeability on the precision of yokeless current sensors.
The results of finite-element method (FEM) fit well the measured field values
around the conductor. Finally we evaluate the difference in magnetic fields distribution
around non-magnetic and magnetic conductor. The calculated values show that
the permeability of the ferromagnetic conductor significally affects the reading of the
electric current sensors even at DC.