A computer controlled measurement system based on National Instruments Data Acquisiton card and National Insturments Lab VIEW software package has been built. First, the hysteresis characteristics of the tested specimen have been simulated by Jiles-Atherton model, and simulated measurements have been performed using LabVIEW functions. This work is a preliminary study of LabVIEW and the measurement of hysteresis. The main goal is to control the magnetic flux density measured on a toroidal shaped core with a feedback controller. In this paper, the developed procedure, which is able to measure the hysteresis characteristics applying analogue and digital integrators, and to control the waveform of magnetic flux density determined from the voltage induced in the secondary coil wound on the toroidal shaped core is presented. The experience proves that the developed controller is stable and robust. This work is an initial step of the vector hysteresis measurement system. © 2007 Akadémiai Kiadó.