The LEM device has three independent turns on the primary that can be connected in
various series/parallel combinations to give current measurement ranges of 104mV/A,
208mV/A and 312mV/A. If a higher sensitivity is desired to measure lower currents, the
user can add additional turns to the primary. For example, wrapping 10 turns of 30 gauge
wire through the center of the LEM device and leaving the three primary turns of the device
unconnected gives a sensitivity of 1.04 V/A and a usable measurement range of ± 1.92 A.