The slave current source (Is) is adjusted by changing the primary turns until a voltage
balance across the two resistors is obtained. The master current source (Ix) is fixed at a
level dependent on the desired sensitivity and the required power level for Rx. The
current (Is) is adjusted to obtain a voltage balance across the two resistors as indicated
by the nanovolt detector (nV). The CPU monitors the nV voltage and adjusts the Nx
turns automatically to maintain zero volts difference across the two resistors.