Calibration of a magnetic sensor device

The invention relates to the calibration of the magnetic sensor device comprising magnetic excitation wires (11, 13) and a magnetic sensor element, for example a GMR sensor (12), for measuring reaction fields (B2) generated by magnetic particles (2) in reaction to an excitation field (B1) generated by the excitation wires. The magnetic sensor element (12) can be calibrated by saturating the magnetic particles (2) with a magnetic calibration field (B3). Thus the direct (crosstalk) action of the excitation field (B1) on the magnetic sensor element (12) can be determined without disturbing contributions of the magnetic particles (2). WO 2007122542 (A3) US 2009072815 (A1) JP 2009535615 (A) EP 2013645 (A2) CN 101427157 (A)