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Run the Multiplexed Cyclic Polarization standard technique by selecting Experiment > Multiplexed DC Corrosion > Multiplexed Cyclic Polarization from the Framework™ menu bar. This initiates the following sequence of events:
1.Framework™ creates a Runner window, and the Multiplexed Cyclic Polarization.exp script is run in this window.
2.The script creates the Setup dialog box and accepts changes in the experimental parameters. This dialog box allows you to specify the channels to be run, information concerning each channel, and global information about the entire experiment on all channels.
3.The script opens the electrochemical parameters file (SYSTEM.SET) and recovers the electrochemical system characteristics (βs, density , Equiv. Wt.) for each active cell from the file. If the script cannot open the file or find the System Name, the script warns you and then returns you to the Setup dialog box.
4.The script now opens the data file associated with each active Multiplexer channel to see if there are any problems with the composite (base plus channel number) file name.
5.The script now obtains the use of the potentiostat and Multiplexer specified during Setup and opens the data file using the Output name. It initializes the Multiplexer so that all the cells are in the off state specified in the script. If the potentiostat or Multiplexer are in use or the file cannot be opened, the script returns you to the Setup dialog box. The file header information is written to the data file. This information is written to the file prior to data acquisition. If the experiment is aborted, the file contains only this information. This header information includes:
•Tags identifying possible analyses.
•The current time and date.
•A list of the Setup parameters.
6.If Conditioning was selected in Setup, the local potentiostats in the Multiplexer condition all the Multiplexer channels. This includes both channels selected for data acquisition and cells that are not selected.
7.The script switches the Multiplexer to the first (or next) selected channel.
8.A complete Cyclic Polarization experiment is run on this cell. Electrode conditioning is performed if requested. An Initial Delay is performed if requested. In all cases, Eoc is measured prior to the scan.
9.Finally, the actual scan occurs. If iR-compensation has been selected, each potential is corrected for the measured iR-drop of the preceding point. A plot of log(I) vs. E is displayed during the scan.
10.Once the scan is over, the cell is turned off and the Multiplexer channel is turned off. Steps 7 to 9 are now repeated for every other active channel.