I have no experience in this, but I seem to recall that when using Hall
Effect devices for DC current measurement, you sometimes put a multiturn
winding on the same core that your single turn primary passes through. You
can then use an amplifier to put a current through the multiturn winding
until the net magnetic field is zero, as measured by the Hall Effect
device. If you have a 100 turn winding, the current through the single
turn is 100 times that through the 100 turn winding. Using this approach,
nonlinearities due to the Hall Effect device and the core are minimized.

Harold


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