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Each measurement of the EMDEX data logger consists, in part,
of the measurement of three orthogonally oriented magnetic
field sensor coils. Each coil measures the magnetic field
along its axis.
The manufacturer quotes accuracy as "...nominally 2 percent. The
AC field detectors report a time-averaged, rectified
amplitude which is calibrated to agree with a 60Hz rms
The digitized value recorded by the EMDEX for each coil is
an non-negative integer in the range 0 to 255.