Chapter 6 -- Panel Indicators and Connectors--Rear Panel
6 - 7
The E Monitor 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 Ohms in parallel with 220 pF.
Ext. Sig. In BNC
The External Signal In BNC connector allows you to add a voltage to the Reverence 600’s Signal Generator.
This signal will be 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 3000’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 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 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 3000’s controller board to the potentiostat board. This signal has a high bandwidth. The signal
output range is –15 volts to +15 volts.
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 Ohms 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 volts in equals ±30000 A/D counts. This is a resolution of
100 µV per bit. The results will be reported in volts. The input is differential (see Appendix D).
The allowed input voltage range is ±5 volts. Input voltages outside this range could result in damage the
Reference 3000.
Consult Appendix D for additional information concerning this connector.
CAUTION
The shell of the E Monitor BNC is connected to the Reference 3000’s Floating Ground.
Connection of this BNC to earth ground referenced equipment can compromise the
Reference 3000’s ability to float and invalidate data collected on earth grounded cells.
CAUTION
The shell of the Ext Sig In BNC is connected to the Reference 3000’s Floating Ground.
Connection of this BNC to earth ground referenced equipment can compromise the
Reference 3000’s ability to float and invalidate data collected on earth grounded cells.
CAUTION
The shell of the Ext Sig In BNC is connected to the Reference 3000’s Floating Ground.
Connection of this BNC to earth ground referenced equipment can compromise the
Reference 3000’s ability to float and invalidate data collected on earth grounded cells.
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