The 273/273A systems cannot be configured as an open circuit ZRA device. To perform an equivalent experiment with the 273/273A systems require that a zero volt (0V) potential be applied (using the Potentiostatic technique in PowerCORR^®) between the materials of interest. Thus, the special cable connections required for this technique are:

Working electrode (green) is connected to one of the samples

Both the Counter (red) and the Reference leads (white) are connected to the other sample

Reference Electrode not connected

The 0V potential between the two samples results in short-circuit current flow, equivalent to an open-circuit ZRA measurement. Unfortunately, the coupled potential cannot be measured in this configuration, as the reference lead is used to maintain the 0V difference.