In magnetic surveys, sources of 50 / 60 Hz noise are derived from two sources, namely, noise picked up in the sensor coils and noise actually present in the magnetic field data. GEM protects users from these types of noise using a measuring technique that we call “full period nullification”.
The normal approach to calculating magnetic field values is to measure the number of zero crossings in the given measurement period and therefore, derive the frequency response (i.e. proportional to field). With full period nullification, we ensure that the measurement period includes an even number of positive and negative peaks. The net effect is that any AC noise is eliminated.
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