Chapter 4 -- Stability in Potentiostat Mode -- Improving Potentiostat Stability
4-4
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Add resistance to the counter electrode lead. See Figure 4-3. This change lowers the effective gain
bandwidth product of the control amplifier. As a rule of thumb, the resistor should be selected to
give one volt of drop at the highest current expected in the test being run. For example, if you
expect your highest current to be around 1 mA, you can add a 1 k
Ω
resistor.
This resistor has no effect on the DC accuracy of the potentiostat. It can create problems in high
speed experiments such as fast CV scans or EIS, which need high bandwidth.
Figure 4-3
Resistor Added for Stability
Red
White
Green
Counter
Reference
Working
Resistor
