Gamry Instruments PCI4/300 Potentiostat/Galvanostat/ZRA, Руководство оператора

Страница: 33 / 63

Chapter 4 -- Stability in Potentiostat Mode -- Improving Potentiostat Stability
4-3
•
Provide a high frequency shunt around the cell. A small capacitor between the red and white cell
leads allows high frequency feedback to bypass the cell. See Figure 4-2. The capacitor value is
generally determined by trial and error. One nanofarad is a good starting point.
In a sense, this is another form of an AC coupled low impedance reference electrode. The counter
electrode is the low impedance electrode, eliminating the need for an additional electrode in the
solution.
Figure 4-2
High Frequency Shunt
Red
White
Green
100 pF to 10 nF
Counter Reference
Working