Appendix G: Optional Interface 5000 Monitor Board; Introduction; Connectors; Ext Sig In - Gamry Interface 5000 Operator's Manual

Appendix G: Optional Interface 5000 Monitor Board--Introduction

Appendix G: Optional Interface 5000 Monitor Board

Introduction

In order to monitor various different signals, you
will need the Interface 5000 Monitor Board. This is
an optional accessory that allows you to observe
several different input signals, including an auxiliary
input, among others.

Connectors

There are six connectors on the Interface 5000
Monitor Board:

EXT SIG IN

The EXT SIG IN BNC connector allows you to add a
voltage to the Interface 5000's signal generator. This
signal is summed with the other signal-generator
sources, including the IR DAC, the Scan DAC, and the DDS output.
The outer shell of the BNC is connected to the Interface 5000's floating ground.
Caution:
Ground. Connection of this BNC to a piece of earth-ground-referenced equipment can compromise the
Interface 5000's ability to float, and invalidate data collected on earth-grounded cells.
The signal generator output is usually directly connected to the potentiostat's input. When the cell is turned on
in potentiostat mode, the feedback is such that a negative signal-generator output creates a positive differential
electrometer signal, which corresponds to a negative working electrode versus reference electrode voltage.
The polarity of the EXT SIG IN signal is inverted at the signal generator's output. As described above, a negative
input signal on this BNC creates a positive change in the working electrode versus reference electrode voltage.
The input impedance of this signal is 3 kΩ in parallel with 15 pF.

AUX IN

Caution:
circuitry.
The AUX IN BNC connector allows you to measure a voltage from outside the Interface 5000 using the
Interface 5000's internal A/D. The scaling is 3 V in equals 30 000 A/D counts. This is a resolution of 100 µV
per bit. The results are reported in volts. The input is differential (see Appendix D).
The allowed input voltage range is 5 V.
Consult Appendix D for additional information concerning this connector.
The shell of the EXT SIG IN BNC is connected to the Interface 5000's Floating
Voltages outside the AUX IN range of ±5 V could damage the Reference 3000
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