The digital fluxgate magnetometer converts the sensor signal directly after the preamplifier. The following figure shows the concepts of an usual fluxgate magnetometer and the digital fluxgate magnetometer.

By the digitalisation close to the sensor the magnetometer gets insensitive for external influences like changes in grounding or HF disturbances etc, which lead to offset changes in conventional analogue electronics. The stability of the AD converter offset is no longer important because the alternating sensor signal is digitalised and the rectification is done by a sign depending summation.
Furthermore, the temperature- dependence of the analogue electronics, especially of the filter and the symmetry of the phase sensitive detector, are no longer a problem because these parts are substituted by digital signal processing. The digital fluxgate magnetometer offers the possibility of easy adaptation of frequency and dynamic to the specific needs.