PARSTAT 4000 Hardware Manual
PARSTAT 4000 Hardware Manual 20
5. The following descriptions and figures explain how to connect a two-, three-, or
four-terminal electrochemical cell to the terminals of the PARSTAT 4000 cell cable.
a) Batteries, capacitors, resistors, fuel cells, and some sensors are generally
connected using a two-terminal connection (Figure 6). The connectors for the
cable leads are designed to allow easy interconnection of the working/sense
and reference/counter leads. Note: If your cell has low impedance (battery)
and/or your experiment generates currents in excess of 100mA, do not
connect the leads into one another for a two-terminal connection.
Instead, connect the leads independent of one another to their proper
terminal at the cell to prevent voltage offsets that can result from
milliohms of contact resistance in a “piggy-back” connection as shown
below.
Figure 6. Two-Electrode Connection
b) General aqueous electrochemistry, corrosion experiments, and most EIS
experiments are connected using a three-terminal connection (Figure 7). The
voltage at the working-sense is controlled relative to a stable reference
electrode positioned in close proximity to the working electrode.
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