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<< Click to Display Table of Contents >> Navigation: Experiments > H - Electrochemical Noise > Techniques > Galvanostatic Mode Electrochemical Noise > Galvanostatic Mode Electrochemical Noise - Experimental Sequence |
Run the Galvanostatic Mode Electrochemical Noise standard technique by selecting Experiment > Electrochemical Noise > Galvanostatic Mode Electrochemical Noise from the Framework™ menu bar. This initiates the following sequence of events:
1.Framework™ creates a Runner window, and the Galvanostatic 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 now obtains the use of the potentiostat specified during Setup and opens the data file using the Output name. If the potentiostat is 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.
4.The 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.
5.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.
b.On waking, the script sets the appropriate current range.
c.A one-second delay happens here to give the potentiostat time to settle.
d.The block of voltage data points is measured.
e.Erms is calculated and added to the noise curve.
f.The point just acquired is printed out to the data file.
g.If more points are needed, return to Step 5a. If not, go to Step 6.
6.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.