An electronic circuit is described that allows the use of an inexpensi
ve Hall probe as a high-performance magnetic-field sensor. The circuit
contains a high-precision voltage reference, a proportional control t
hermostat, a 16 bit serial analog-to-digital converter, and a digital
control subsystem integrated into a single programmable logic device.
The precision of the probe is of about 4 mu T. (C) 1997 American Insti
tute of Physics.