Appendix C -- I/O Connectors--Monitor Connector
11 - 3
Caution
The ground side of the I Monitor signal is connected to the Interface 1000 Floating
Ground. Connection signal to an earth ground referenced apparatus can compromise the
Interface 1000’s ability to float and invalidate data collected on earth grounded cells.
Scaling on this signal is ± 3 volts for ± the nominal full scale current on the selected current range. Cathodic
currents will cause a positive output voltage. If the software is auto-ranging the current-range selection, this
signal will be discontinuous at each range change.
The I 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.
E Monitor Signal
The E Monitor signal is derived from the output of the Interface 1000’s differential electrometer circuit. It can
be treated as a 2-wire differential signal with the negative side connected to the Interface 1000 Signal Ground.
With the exception of the filtering described below, it is the raw voltage signal, with no offset or gain applied.
With the exception of the filtering described below, it is buffered representation of the voltage difference
between the white and blue cell cable leads.
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.
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 2-wire differential
signal with the negative side connected to the Interface 1000 floating ground. This signal will be summed with
the other signal generator sources including the Bias DAC, the Scan DAC, and the DDS output.
Caution
The negative side of the External Signal In signal is connected to the Interface 1000
Floating Ground. Connection of this signal to earth ground referenced apparatus can
compromise the Interface 1000’s ability to float and invalidate data collected on earth
grounded cells.
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 BNC will create a positive change in the working electrode versus reference
electrode voltage. The input impedance of this signal is 2 kΩ.
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