Chapter 6 -- Panel Indicators and Connectors--Rear Panel
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A full description of this connector can be found in Appendix C of this manual. This appendix includes details
such as connector pin-out, output and input voltage levels and full signal descriptions.
The following list is a short description of the signals in the Misc I/O Connector and their uses:
• Sync Out and Sync In signal allow two or more Reference 3000s to use one data acquisition clock.
• Four digital outputs can be used to turn on external devices under control of an Explain experimental
control script.
• Some of Gamry applications assign three of the digital output to control stirring, flow of deaeration gas,
and formation of mercury drops on a mercury drop electrode.
• Four digital inputs that can be read in an Explain experimental control script.
• A 12-bit D/A converter used to set “continuously variable” settings, such as electrode rotation rate on a
rotating disk electrode.
• A 5 volt isolated power supply that can provide up to 50 mA of current for external circuitry.
Caution
Floating operation of Reference 3000 can be compromised by improper cabling to the
User I/O Connector. We do not recommend use of standard 15-pin shielded cables with
this connector. Custom cables with the shield connected to pin 6 of the D-connector are
preferred.
I Monitor BNC
The I Monitor BNC connector represents the output of the Reference 3000’s current measurement circuit.
With the exception of the filtering described below, it is the raw signal. It will be high bandwidth on the less
sensitive current ranges. The effective bandwidth of the current signal falls as you reach the nA and pA current
ranges. IE Stability capacitors further slow the response.
The outer shell of this BNC connector is connected to the Reference 3000’s floating ground.
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 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.
E Monitor BNC
The E Monitor BNC connector is the output of the Reference 3000’s differential electrometer circuit. With the
exception of the filtering described below, it is a buffered representation of the voltage difference between the
white and blue cell cable leads. It has a high bandwidth.
The outer shell of the BNC connector is connected to the Reference 3000’s floating ground.
CAUTION
The shell of the I 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.
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