These problems were resolved by fabricating a substitute equipment ground cord. It consists of a standard table mat ground cord, with a 1-MOhm resistor, and a standard three-prong electrical wall plug. The spade of the plug. which would normally mate with the "hot" (phase) slot of a standard three-wire receptacle, was removed. The ground cord with resistor was connected to the equipment ground terminal on the plug. The normal spade used for the neutral return remained unconnected and was left in the plug to provide mechanical stability for connection to any standard three-wire wall receptacle.