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Cell Cable Terminations - Potentiostat and Galvanostat Modes
Color
Type
Blue
Banana Plug
Green
Banana Plug
White
Pin Jack
Red
Banana Plug
Orange
Banana Plug
Black
Pin Jack
Connect both the blue and green cell leads to the working electrode. The working electrode is the electrode
being tested. The blue pin jack connection senses the voltage of the working electrode. The green working
electrode connection carries the cell current. The working electrode may be as much as 250 mV above the
circuitry ground (floating ground).
Connect the white pin jack to the cell's reference electrode, such as an SCE or Ag/AgCl reference electrode.
The measured cell potential is the potential difference between the blue and white cell connectors.
If the instrument is connected in stack mode and the reference input is not used, it should be connected to the
floating ground wire. A pin plug shorting bar is provided for this purpose.
You may need to connect the Reference 3000 to a two terminal device (such as a commercial battery). In this
case, you connect both the white cell and red cell leads to one side of the device and the blue and green cell
leads to the other side. Try to connect the white and blue leads as close to the device as possible.
Connect the red banana plug to the counter or auxiliary electrode. The counter electrode is usually a large
inert metal or graphite electrode. The counter electrode terminal is the output of the Reference 3000's power
amplifier.
The orange lead is only used in ZRA mode and Stack Mode where it senses the counter electrode potential (see
following section). Automatic switching to ZRA mode is possible if this lead is connected to the counter
electrode. If you will not be using ZRA or Stack mode, this lead can be left open or connected to the Counter
electrode.
The black pin jack is connected on the Reference 3000 end to Floating Ground. This is the circuitry ground for
the analog circuits in the Reference 3000. In most cases, this terminal should be left disconnected at the cell
end. When you do so, take care that its metal contact does not touch any of the other cell connections.
If your cell is a typical glass laboratory cell, all of the electrodes are isolated from earth ground. In this case, you
may be able to lower noise in your data by connecting the Reference 3000's Floating Ground to an earth
ground.
If any electrode in your cell is at earth ground, you must not connect the Reference 3000
chassis to earth ground. Autoclaves, stress apparatus, and field measurements may
involve earth grounded electrodes.
A binding post on the rear panel of the Reference 3000 is provided for this purpose. A water pipe can be
suitable sources of earth ground.
Chapter 5 -- Cell Connections--Normal Cell Connections
Table 5-1
Name
Working Sense
Working Electrode
Reference
Counter Electrode
Counter Sense
Floating Ground
CAUTION
Normal Connection
Connect to working electrode
Connect to working electrode
Connect to reference electrode
Connect to counter electrode
Used in ZRA mode - connect to counter electrode
Leave open or connect to a Faraday shield
5 - 2
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