Panel Indicators and Connectors – Rear Panel
64
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.
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.
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.
Caution:
The shell of the
Sig. Gen. Out
BNC is connected to the Reference 3000’s
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.
Caution:
Voltages outside the
Aux. In
range of ±5 V could damage the Reference 3000
circuitry.
