the present invention describes a method enabling one to shield a device that measures weak biomagnetic signals from strong magnetic interference fields . the measurement sensors are provided with a feedback compensation loop , the difference signal of which is obtained from the measurement sensors themselves . as the actuator of the feedback function , one or more coils are responsible for eliminating , the external interference fields in the region of the sensors . difference signals can be generated as a linear combination from the signals of two or more sensors . in the control logic , the sss method can be used to numerically separate the biomagnetic signal being measured from the signals produced by the sources — compensation coils and interference sources — disposed outside the measurement region . the interference suppression can be enhanced by placing the assembly of sensors and the actuators within a magnetically shielding room .