The present invention relates to a novel manner of measuring DC fields using a multi-channel MEG or MKG measuring instrument and on the other hand, to a manner of eliminating from the measurement result the interference signals caused by the DC currents. The invention combines the monitoring system of a testees movement and the method for motion correction of the measured signals so that the signals produced by the DC currents of a moving testees are visible in the final measurement result as a static signal component in a conventional MEG or MKG measurement. In that case, in the measurement, it is not necessary to beforehand prepare oneself for measuring the DC fields.
