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Appendix E – Auxiliary A/D Input Characteristics
Overview
The Controller Card used in the Gamry Instruments PCI4 Potentiostat has jumpers that configure the input
circuitry used for the Aux A/D function.
Jumper Identification
The three jumpers that configure the Aux A/D input are in a cluster located at the right side of the Controller
Card. The four coax cables that route analog I/O to the card enter the card just above these jumpers. See the
figure to the right for jumper locations.
J604
Input Impedance Selection
Two jumpers are associated with the input impedance – J603 and J604. With J603 and J604 installed, the Aux
A/D inputs have a 100 kΩ input impedance. This is the default setting. With the jumpers installed, the
potentiostat can be calibrated without a cable on the input SMC connector.
With both J603 and J604 removed, the Aux A/D input impedance is 10 GΩ (typically). This setting is suitable
for use with a high impedance source such as a reference electrode. If you have removed these jumpers, do
not calibrate the potentiostat unless you have a cable connecting both Aux A/D inputs to floating ground.
Appendix E – Auxiliary A/D Input Characteristics -- Overview
Auxiliary A/D Input Configuration Jumpers
View of PCI4 Controller Card
Figure E-1
6-15
J602
J603
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