Editing Hall effect sensor (section)

==== Improving signal-to-noise ====
Integrating a Hall sensor into a ferrite ring (as shown) concentrates the flux density of the current's magnetic field along the ferrite ring and through the sensor (because flux flows through ferrite much better than through air),<ref name=":0"/> which greatly reduces the relative influence of stray fields by a factor of 100 or better. This configuration also provides an improvement in [[signal-to-noise ratio]] and drift effects of over 20 times that of a bare Hall device.

The range of a given feedthrough sensor may also be extended upward and downward by appropriate wiring. To extend the range to lower currents, multiple turns of the current-carrying wire may be made through the opening, each turn adding to the sensor output the same quantity; when the sensor is installed onto a printed circuit board, the turns can be carried out by a staple on the board. To extend the range to higher currents, a current divider may be used. The divider splits the current across two wires of differing widths and the thinner wire, carrying a smaller proportion of the total current, passes through the sensor.