Sequence Wizard

 

The Sequence Wizard is a standard feature included in the Gamry  Framework Software to more easily allow sequential experiment combinations to be performed. 

To access the Sequence Wizard, you need to have the Gamry Framework open.  Click on Experiment on the main menu and select Sequence Wizard from the menu list.  This will open a new window where you can begin to create your experimental sequence.
 

 
The Sequence Wizard Showing a Simple Sequence

On the left hand side is a list of experiment and sequence tools that are available and on the right hand side is the Window where the sequence is built.  Items can be added to the Sequence in three ways; by double clicking on the item; by dragging-and-dropping the item ; by highlighting the item and pressing the "+" button at the bottom of the Window.  Items are added sequentially one after the other.  Once you have added some of the items to your sequence list, you can rearrange the items by dragging-and-dropping .  A blue line will appear to showing the position of the item in the list. 

After you have built your sequence, you can run it in several ways.  If you want to launch it immediately, just press the Run Sequence button at the top.  However, if you want to run the same sequence over and over again or if you want to make several sequences and run them at a later date, you can save the sequence as an Explain experimental script.  The script is saved in the experimental scripts directory and then can be chosen at a later date.

Features of the Sequence Wizard

The Sequence Wizard has a number of exciting features that enhance the Framework, making it more powerful.  These include loops based on cycle number, time and/or a user-defined variable. Variables can be defined and manipulated during the sequence to aid in the control of the experiments.  For example, you may want to run a number of EIS experiments at different potentials.  This can be accomplished by defining a potential variable and the incrementing it every time you go around the loop.
 

Example of a Sequence using Loops
 

The above figure shows an example of a sequence where loops are used.  The experiment involves taking an impedance (EIS) spectrum at different potentials until a final potential is reached.  Initially, a potential variable is defined which will be used in the potentiostatic EIS experiment as the applied DC potential.
 

After the impedance spectrum has been acquired, the variable is modified and the loop continues until the potential reaches a limit value.
 

The DC Voltage is grayed out, indicating that a variable has been selected.

This box shows the variable being modified.



The loop continues until the variable is greater than or equal to the specified value.

The ability to control the cell state between experiments has been included in the Sequence Wizard.   In some instances it is important to keep your cell under potential control at all times.  Experiments in the sequence can also be continued at the last measured potential.

The Sequence Wizard supports the independent control of channels in the Gamry ECM8 Multiplexer, which allows you to have eight different experiments on eight different channels!  An example of this would be if you want to run impedance experiments on channels 1 through 4 and cyclic voltammetry on channels 5 through 8.

If you have a TDC2 or TDC4 temperature controller, you can control your experiments to wait until the temperature of your cell has reached a set value.  You also could use loops to increase the temperature of your experiment on successive passes through the loop.

Differences between the Standard Experimental Scripts and the Sequence Scripts

There is one important difference between the standard experimental scripts and the sequencer experimental scripts.  In the Sequence Wizard, none of the experiments has an initial open circuit potential delay measurement.  This means that, if you wish to reference the applied potential with respect to the open circuit potential, you must include an open circuit potential measurement step in your sequence.  If no open circuit measurement step is included, the Applied Potential defaults to the Applied Potential vs. Eref..

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Last revised on Monday, January 11, 2010