PED Editor

Click on the PED command button to open the PED Editor. The dialog box controls depend on which PED Mode is selected.

Conductivity Mode

File Menu

New prepares the system for creation of a new file.

Open... displays a file box from which you can select and retrieve an existing file from disk.

Save... displays a Save dialog box, so that you can save on disk the PED file currently being edited. Type a filename of no more

spaces).

The dialog box scroll bar adjusts the detector temperature

compensation factor to correct for changes in response caused by temperature variation in the mobile phase. For more information, see the PED Operator’s Manual (Doc. 034177).

DC Amperometry Mode

File Menu

New prepares the system for creation of a new file. Open... presents a file box which allows you to select and retrieve an existing file from disk.

Save... displays a Save dialog box, so that you can save on disk the PED file currently being edited. Type a filename of no more than eight characters (letters and/or numbers, no punctuation or spaces).

The DC Amperometry Mode can be used for DC amperometry or cyclic voltammetry. The dialog box scroll bar lets you select a potential for a new program or edit a potential in an existing program. For more information, see the PED Operator’s

Integrated Amperometry Mode

File Menu

New prepares the system for creation of a new file.

Open... presents a file box in which you can select and retrieve an existing file from disk.

Save... saves on disk the PED file currently being edited and opens a Save dialog box. Type in a filename of no more than eight characters (letters and/or numbers, no punctuation or spaces).

Print sends the current file to the printer. Scale Menu

Integrated Amperometry Mode can be used for integrated amperometry or pulsed amperometry. To create a program, you must first enter both a time/potential program and an integration period. The repeating sequence of potentials applied to the cell working electrode is defined by points selected on the displayed graph.

Step 1 of every program is at time zero. Since this cannot be changed, the first value you will enter is the first potential. Enter the remaining times and potentials in sequence until the program is completed; for each step, enter first the time and then the potential. Enter a program as follows:

Waveform

1. Enter the potential for the first step of the program in the Potential dialog box (the Waveform Time is always 0 for the first entry). Click on the Add command button below the Waveform list box to enter the value.

2. Enter the time for the second step in the Time edit box. Use the <Tab> key to move to, and highlight, the Potential edit box and then enter your second step Potential value. Click the mouse cursor on the Add button to enter the values. (If you prefer, use the I-bar cursor to enter values in the edit boxes rather than highlighting with the <Tab> key.)

3. Enter the remaining times and potentials in sequence until the program is complete.

Integration

Enter the Integration beginning time and ending time in the

Integration dialog boxes, and then click on the Add command button. The integration period appears as a shaded region on the screen waveform graph.

Editing a Program

1. Select a line in the list box for editing.

2. Change the value(s) as desired in the edit box(es). 3. Click the mouse cursor on the Enter command button.

Data processing parameters specify how the data from an analysis is processed, what information is included in the final analytical report, and whether the data is stored on disk.

Click on the Detector 1 or Detector 2 command button in the ACI Method Editor main window to open the Data Processing Parameters dialog box. The six command buttons in the dialog box correspond to the six types of data processing parameters; click on the desired command button to open a a dialog box in which you set these parameters.

The ACI Method Editor Data Processing dialog boxes are the same as the Data Processing dialog boxes described in the Method Editor chapter. See Section 5.8 for details about each dialog box.

NOTE The easiest way to edit Data Events is through the Optimize program, where the effects on integration are displayed instantly.

The Schedule Editor is used to create, edit, and save Schedules, which consist of one or more Methods linked so that they automatically perform a series of analyses. A typical Schedule might include one or more calibration runs, analyses of several samples, a column change and an equilibration, followed by new calibration runs and more samples. Each Schedule step specifies the Method, data filename, and other parameters used to analyze a single injection. A Schedule may be repeated from 1 to 999 times. You can also use the Schedule Editor to specify groups of data files to be

reprocessed by the Batch program.

The Run (or ACI Run) program performs this sequence of events for each Schedule step:

(a) Run retrieves the Schedule file from disk and uses the Method specified in the Schedule to analyze the injection for that step. (b) Raw data is processed according to the data processing parameters

selected for the Method.

(c) Run saves the data and prints any reports specified in the Method. (d) Run updates the data filename in the Schedule file with the raw

data filename it actually used.

(e) Once all modules reach the last timed event and Run completes data collection from all detectors (or Advanced Computer

Interfaces) used in the Method, Run loads the Method for the next injection and transfers it to the modules in the system.

NOTE You may open the Schedule Editor and view the updated file while a Schedule step is running. However, do not save this file to the hard disk; doing so would overwrite the Schedule file updated by Run.