Gamry Instruments Universal Dummy Cell 3 Manual do operador - Página 7

Procurar online ou descarregar pdf Manual do operador para Equipamento de teste Gamry Instruments Universal Dummy Cell 3. Gamry Instruments Universal Dummy Cell 3 8 páginas. Circuit board used for calibration and troubleshooting of a gamry potentiostat.

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--DC Corrosion--

DC Corrosion

The UDC 2's DC Corrosion circuit simulates current versus voltage behavior of an ideal corrosion cell. A

voltage scan on this cell, with current range auto-ranging enabled, is particularly useful when testing

potentiostat operation because almost all current ranges will be used during the scan.

Figure 3

DC Corrosion Dummy Cell Schematic Diagram

SR106

270 uF

1 M

100

1 k

The circuit diagram of the DC Corrosion cell is shown in Figure 3.

Current through a Schottky diode is proportional to the logarithm of the applied voltage, modeling a kinetically

controlled electrochemical process. Unfortunately a Schottky diode based dummy cell does not model

corrosion perfectly. A corroding electrode has a non-zero I

(corrosion current) while I

is essentially zero for

corr

this test cell.

You must have a license for Gamry's DC105 software to fully utilize this cell. You can run the CHECK105

script provided with the DC105 application.

If you want to test your system using a standard DC105 technique, we recommend using the Tafel technique.

Your scan should be slow (0.50 mV/sec) and should use a Sample Period of 0.5 second per point.

This cell gives acceptable log I versus E linearity for potentials  175 mV of E

(zero volts on this cell). Current

corr

interrupt iR compensation during the scan expands the linear region to  300 mV but adds noise to the data.