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Calibration
You should calibrate each potentiostat installed in your system. A calibration script is provided with the Gamry
Framework. The Installation Manual for every major application package contains instructions for calibration
using this script.
The calibration for the Reference 3000 has been divided into three sections: DC Calibration, AC Calibration,
and Low I DC Cal. All three calibration procedures are accessed via the Utility selection on the Framework's
Experiment pull down menu.
Separate Calibration for Each Reference 3000 Cable Type
The Reference 3000 recognizes the type of cable connected to its cell connectors. It maintains a separate AC
calibration table for each type of cable. The Gamry Framework will not let you use AC calibration data
recorded using a 60 cm shielded cable for experiments run using a longer cable.
DC and AC Calibration
These two procedures use an external resistive dummy cell.
Reference 3000 calibration calls for an external resistive dummy cell. Your Reference
3000 was shipped with a Universal Dummy Cell 4, which includes a 2 kΩ Ω Ω Ω , 0.02%
accurate resistor in the position marked "Calibration". After calibration, please place
this dummy 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 Universal Dummy Cell 4, you
can perform DC Calibration using a different 2 kΩ Ω Ω Ω resistor. Its wattage is
unimportant. Some performance checks in the calibration process may fail if the
resistors inaccuracy exceeds 0.2% (4 Ω Ω Ω Ω ).
We do not recommend AC Calibration with any resistor other than the one on the
Universal Dummy Cell 4. The Universal Dummy Cell 4 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
phase shift in your high frequency EIS data. 1.4 pF of stray capacitance across a 2 kΩ Ω Ω Ω
resistor causes a 1° ° ° ° phase shift at 1 MHz.
The resistor used for calibration should be enclosed in a Faraday shield during the calibration process. The
Faraday shield should be connected to the black lead on the standard cell cable.
calibration is included in every Reference 3000 shipment.
Earth grounding the Reference 3000 is also recommended during calibration, but is not essential.
Chapter 4 -- Installation--
CAUTION
4 - 14
A Faraday shield suitable for
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