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Potentiostat calibration is only required infrequently. Recalibrate your Reference 600+ under the following
circumstances:
• It is at least one year since your last calibration.
• Your potentiostat has been serviced.
• You notice breaks or discontinuities in the data curves recorded with your system.
• The system is being run in an environment that is very different from the previous operating
environment. For example, if the Reference 600+ was calibrated at 15°C and you are now
operating it at 30°C, you should recalibrate.
Figure 4-4
200 Ω Calibration Cell with Leads Attached for Calibration
Caution: The standard Reference 600+ calibration calls for an external resistive
dummy cell. Your Reference 600+ was shipped with a 200 Ω Calibration Cell, which includes a 200 Ω,
0.05% accurate resistor. After calibration, please place this Calibration Cell in a safe place where you
can find it if your unit requires recalibration.
If you do need to recalibrate and you cannot find your Calibration Cell, you can perform DC
Calibration using a different 200 Ω resistor. Its power-rating is unimportant. Some performance checks
in the calibration process may fail if the resistors inaccuracy exceeds 0.2% (0.4 Ω).
We do not recommend AC Calibration with any resistor other than the one on the Calibration Cell. The
Calibration Cell was designed to separate the working electrode leads from the counter and reference
electrode leads. If you perform AC Calibration without adequate separation between these leads, you
will see a phase-shift in your high-frequency EIS data. 1.4 pF of stray capacitance across a 200 Ω resistor
causes a 1° phase-shift at 1 MHz.
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