Moving a Retention Window Graphically

Chromeleon allows you to change the retention window, i.e., the expected Retention Time and the time Window, for single peaks in the chromatogram:

• Go to the Peak Table tab page of the QNT Editor to check the graphical move of the retention window described below:

• Option: Add the lines that indicate the time limit of the window to the chromatogram: In the Chromatogram Decoration dialog box, select the Show all caliper drop lines check box on the Peak Calipers tab page. (For more information, refer to  Showing the Peak Information in a Separate Area.)

To graphically move the retention window, perform one of the steps below:

1. Move the entire window: To move the retention window of a peak, point to the center of the associated peak caliper. The pointer changes its appearance and looks as follows: .

Hold down the left mouse button and drag the caliper to the desired position, i.e., to the desired time.

The entry in the Retention Time column of the peak table is updated automatically.

2. Move the start or end time: To change the time of a specific line, point the edge of the caliper or on the associated dotted line. The pointer changes its appearance and looks as follows .

Hold down the left mouse button and drag the line to the desired position, i.e., to the desired time.

The entries in the Window and Retention Time columns of the peak table are updated automatically.

3. Move the start or end time symmetrically: Hold down the SHIFT key when you point to the edge of a caliper or on a dotted line. The pointer changes its appearance and looks as follows .

Hold down the left mouse button and drag the lines to the desired position, i.e., to the desired time.

The entry in the Window column of the peak table is updated automatically.

 Tip: 

In the same way, you can change the start and end time of an area for groups of unidentified peaks.