Finally, snap the resistor end of the pretest cuff-to-ground cord onto the cuff. Barring other unimpeded paths to ground, this system now provides at least 2 MOhms of resistance to ground from both the operator and the unit under repair, and at least 1 MOhm of resistance to ground between the mat and ground. With common resistance to ground from both the operator and the unit under repair, the operator and the unit are equipotential.