Appendix C : I/O Connectors--Monitor Connector
Appendix C - 4
The E Monitor signal is filtered using an RLC circuit. It has a bandwidth of approximately 150 kHz 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 1 kΩ in parallel with 47 pF.
External Signal In
External Signal In allows you to add a voltage to the Interface 1000’s Signal Generator. It is a two-wire
differential signal with the negative side connected to the Interface 1000 floating ground. This signal is summed
with the other signal-generator sources, including the Bias DAC, the Scan DAC, and the DDS output.
The signal generator output is 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 External Signal In signal is inverted at the signal generator’s output. As described above, a
negative input signal on this input will create a positive change in the working electrode versus reference
electrode voltage. The input impedance of this signal is 2 kΩ.
Caution:
The negative side of the External Signal In signal is connected to the Interface
1000 Floating Ground. Connection of signal to an earth-ground-referenced apparatus can compromise the
Interface 1000’s ability to float, and invalidate data collected on earth-grounded cells.
Caution:
The negative side of the E Monitor signal is connected to the Interface 1000
Floating Ground. Connection of signal to an earth-ground-referenced apparatus can compromise the
Interface 1000’s ability to float, and invalidate data collected on earth-grounded cells.
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