In this, a pair of two independent constant current sources connected across opposite pairs of armature windings through their respective commutator bars. The constant current sources are identical in output current and are connected in opposite polarity to minimize circulating current from flowing in other windings of the armature. The voltage drop across the coil divided by the current through the coil the resistance of the winding. The Coil Resistance is displayed and compared against the set limits and accordingly the results are declared.