Defining a Waveform for an ICS-3000/ICS-4000/ICS-5000 Electrochemical Detector (ED)Detector Control
Defining a Waveform for an ICS-3000/ICS-4000/ICS-5000 Electrochemical Detector (ED)
You can select a preprogrammed Waveform from the Program Wizard or PGM Editor, or define a custom waveform.
Set the ED detector mode to Integrated Amperometry.
Go to the EDet Options dialog box of the Program Wizard or PGM Editor.
Turn on the amperometry cell.
In the Waveform Selector table, select the waveform to be edited or select <New Waveform> and press <Enter> or <Tab>.
Tip:
In the PGM Editor, an asterisk (*) before a waveform name indicates that Chromeleon is reading the waveform definition directly from the program (i.e., there is no associated waveform file for this waveform).
Click Edit.
The Waveform Editor appears. If you selected an existing waveform, a plot of the waveform is displayed, with the waveform’s times, potentials, and other settings displayed in the table below. If you did not select a waveform, you can select one now from the Waveform list or you can begin creating a new waveform.
Follow the guidelines below to edit an existing waveform or create a new one:
To add a new line to the end of the list, click Append.
To add a new line above an existing line, select the existing line and click Insert.
To delete a line, select the line and click Delete.
To edit parameters for each line, select the parameter and type or select the new value. Then, press <Enter> or <Tab>.
To update the plot with the new value(s), click Apply.
For each step in the waveform, enter the following parameters:
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Time (ms) |
The time at which to apply the selected voltage.
The absolute maximum waveform period is 2 sec. However, for 2D data, because only 1 data point is generated per waveform period, the effective maximum length of a waveform period depends on the Data Collection Rate. The relationship is as follows: data collection rate x waveform period £ 1 For example, if the data collection rate is 5 Hz (5 points per second), the longest waveform period allowed is 0.2 s (200 ms). To create a longer waveform, reduce the data collection rate. |
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Voltage (mV) |
The voltage to apply between the reference and working electrodes. |
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Gain Region |
Select whether to turn the Gain Region on or off. |
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Ramp |
Select either a Ramp or a Step change: Ramp is a gradual change in potential from this step in the waveform to the next step. Step is an immediate change in potential at this step. |
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For example, enter the following information to define the waveform steps shown in the above example: |
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Time |
Voltage |
Ramp/Step |
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0.00 |
-0.10 |
Step |
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0.20 |
-0.10 |
Ramp |
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0.25 |
0.35 |
Step |
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0.40 |
0.60 |
Step |
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Integration |
The Integration Interval option: On starts or continues integration Off stops integration or keeps integration off (if it was turned off in a previous step)
Each waveform must have one integration interval. Integration cannot begin at the first step or end at the last step in the waveform. |
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After all of the steps have been entered, save the waveform. If you are creating a new waveform or editing one of the default waveforms, enter a new name before saving. The default waveforms provided with Chromeleon are read-only.
Also, refer to:
The Control Program 
The Program Wizard
Control The PGM Editor
How to: Creating and Modifying Programs Manually Editing a PGM File in the Commands View
Selecting a Default Waveform for Integrated Amperometry
