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Run the Multiplexed ZRA Mode Electrochemical Noise standard technique by selecting Experiment > Electrochemical Noise > Multiplexed ZRA Mode Electrochemical Noise from the Framework™ menu bar. This initiates the following sequence of events:
1.Framework™ creates a Runner window, and the Multiplexed ZRA Mode Electrochemical Noise.exp script is run in this window.
2.The script creates the Setup dialog box which becomes the active window and accepts changes in the experimental parameters. This Setup window remembers the experimental settings from the last time this script was run. To restore the parameters to the values defined in the script, click the Default button.
3.The script estimates the total amount of time required to capture a block of noise data on all the selected channels. If this time required is longer than the Repeat Time parameter, the script complains and returns you to the Setup dialog box.
4.The script now obtains the use of the potentiostat and the multiplexer specified during Setup. Each output file is opened. If a file already exists, the script will ask you if you want to overwrite it. If an instrument is in use or a 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.
5.Each cell is turned off and the specimen's Eoc is measured. If an Initial Delay is turned on in the Setup, this step lasts for the time specified as the Delay Time, or until the potential stabilizes. If no Initial Delay is specified, this step only lasts long enough for Eoc to be measured. A plot of potential versus time is always displayed. The last measured potential is recorded as Eoc.
6.The script then goes into a loop, which performs the actual data-collection as follows:
a.The script goes to sleep until it is time to make the next noise measurement. If the total time parameter is exceeded, go to Step 8.
b.The script wakes up and opens the first active channel's output file.
c.The elapsed time is measured.
d.The multiplexer is set to the next selected cell.
e.The script now pauses for one second to give the ZRA time to settle.
f.The block of I and E data points is measured.
g.Irms and Erms are calculated and added to the noise curve.
h.The multiplexer is set so that all cells are at open circuit.
i.Steps 6b through 6h are repeated for each active cell.
7.The script turns off the cell. The last displayed curve, usually the noise curve, is displayed on the screen until the you click the F2-Skip button.