5 Monitor the voltage across each diode, Vd, for all N–1 diodes, and id or Vd for the diode in the known state, depending on whether it was on or off, respectively. These voltages and currents will depend on E.
6 As E is reduced, note which diode changes state fi rst. Replace that diode by a short circuit or open circuit but retain the bucking battery, E.
7 Proceed as in point 6 until E reaches 0 and all diode states of the original circuit are known.