Gamry Instruments Universal Dummy Cell 3 Manual do operador - Página 5

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Introduction

The Universal Dummy Cell 3 (UDC 32) is a printed circuit board used for calibration and troubleshooting of a

Gamry potentiostat. It has 3 "test cells" equipped with terminals, arranged around the boarders of the printed

circuit board.

The terminals are marked with labels corresponding to the leads on a Gamry Cell Cable. The FAS2 has fewer

cell leads than a PCI4 or Reference 600, so some terminals will have no connection to an FAS2.

This document applies to the UDC 3, engineered to work with Gamry's PCI4 family of potentiostats and the

newer Reference 600 Potentiostat. The UDC3 is clearly labeled with the text "Universal Dummy Cell 3"

written diagonally across its printed circuit card.

AC calibration of a Reference 600 Potentiostat should always be done using a UDC3. Stray capacitance on an

older UDC2 will cause significant phase errors at 1 MHz.

Calibration

The calibration circuit is a 2 k precision resistor (with some protection components). It is accurate to better

than 1 . Because potentiostats are not perfectly accurate, its value measured with a Gamry potentiostat is

typically between 1.994 k and 2.006 k.

Very early revision UDCs had a 100  resistor in the calibration circuit. PCI4 family potentiostats and the

Reference 600 require a 2 k resistor. 100  Universal Dummy Cells (shipped before May 2003) will not

calibrate a PCI4 family potentiostat or a Reference 600 to its full accuracy.

AC calibration of a Reference 600 Potentiostat should always be done using a UDC3. Stray capacitance on an

older UDC2 will cause significant phase errors at 1 MHz.

You can also use the calibration circuit to test for proper operation of your potentiostat. Use any technique.

The current at any potential should be given by Ohm's law, I = E/R. At 1 Volt, the current should be 500 A.

More specifically, we recommend you use one of these techniques if you have concerns about your

potentiostat's health:

DC105



EIS300



PHE200



EIS

The EIS Dummy Cell is a Randle's cell (as described in Gamry's Help system). If you have a license for

Gamry's EIS300 Electrochemical Impedance Spectroscopy software, you can record this cell's EIS spectrum to

check your system's EIS operation.

Figure 1, a circuit diagram of the EIS cell is shown below. Figure 2 is a typical spectrum of the cell in Bode

format.

A visual examination of the spectrum is usually sufficient to determine if your EIS system is working. Most

system malfunctions totally prevent recording of the spectrum or cause gross errors that dramatically change the

shape of the curve.

--Introduction--

Polarization Resistance

Potentiostatic EIS

Cyclic Voltammetry