Schematic of the ECM8 Multiplexer

The ECM8 Multiplexer was specifically designed for electrochemical tests as shown in the schematic below. When switch S1 is closed, the cell is connected to the potentiostat. S1 switches all the signals required for 4-terminal electrochemical measurements including the various signal shields and remote sense lines.  This gives better noise immunity and virtually eliminates cable resistance effects.



Unlike general purpose multiplexers, the ECM8 is still in control when a cell is disconnected from the potentiostat between measurements. Three different off-line control modes are possible. With S3 and S4 open, the cell is maintained at open circuit. With S4 closed, the working and counter electrodes are shorted together, allowing ongoing galvanic corrosion. With S3 closed the ECM8 really distinguishes itself. Each channel has its own independently settable local potentiostat which can maintain the cell at constant polarization. The local potentiostat can also be used as a direct analog output useful for controlling ancillary apparatus such as rotators or temperature baths.

In addition, each channel of the ECM8 has a pair of independently switched contacts (Aux 1 & Aux 2) that can be used for any purpose. One use would be to connect these leads to a Gamry PC3 Potentiostat/Galvanostat's auxiliary A/D input.
             
Note: Switches connected with the red lines are always switched together and are therefore treated as one multipole switch.
  


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Last revised on Monday, August 21, 2006