Sig Gen. Out Bnc; Aux. In Bnc; Expansion Interface - Gamry Instruments Reference 3000 Operator's Manual

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 k in parallel with 15 pF.

Sig Gen. Out BNC

The Sig Gen. Out BNC connector allows you to monitor the "signal generator" signal being sent from the
Reference 3000's controller board to the potentiostat board. This signal has a high bandwidth. The signal
output range is –15 V to +15 V.
The outer shell of the BNC is connected to the Reference 3000's floating ground.
Caution:
Floating Ground. Connection of this BNC to a piece of earth-ground-referenced equipment can
compromise the Reference 3000's ability to float, and invalidate data collected on earth-grounded cells.
The Sig. Gen. Out BNC connector is lightly filtered using an RLC circuit. It has a bandwidth of approximately
3 MHz when connected to a high-impedance input. This bandwidth will be further reduced if a coaxial cable
is connected to the BNC. Its output impedance is approximately 200 Ω in parallel with 220 pF.

Aux. In BNC

The Aux. In BNC connector allows you to measure a voltage from outside the Reference 3000 using the
Reference 3000'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.
Caution:
circuitry.
Consult Appendix D for additional information concerning this connector.

Expansion Interface

The expansion interface is a D-connector on the Reference 3000 reserved for use with the Gamry Reference
30k Booster to provide additional cell current up to 30 A. A specially designed digital cable connects the
Expansion Interface port to the booster. Consult the Reference 30k Booster manual for the details of setting up
a booster.
Panel Indicators and Connectors – Rear Panel
The shell of the Sig. Gen. Out BNC is connected to the Reference 3000's
Voltages outside the Aux. In range of ±5 V could damage the Reference 3000
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