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if a coaxial cable is connected to the BNC. Its output impedance is approximately 200 Ω in parallel with
220 pF.
Ext. Sig.In BNC
The Ext. Sig.In BNC connector allows you to add a voltage to the Reverence 600’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
Reference 600+’s floating ground.
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.
Sig. Gen.Out BNC
The Sig. Gen.Out BNC connector allows you to
monitor the “signal generator” signal being sent
from the Reference 600+’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 600+’s floating ground.
Caution: The shell of the
Ext. Sig.In BNC is connected to the Reference
600+’s Floating Ground. Connection of this
BNC to a piece of earth-ground-referenced
equipment can compromise the Reference
600+’s ability to float, and invalidate data
collected on earth-grounded cells.
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