HP Data Explorer 4 manual 187

Creating an Extracted Absorbance Chromatogram (XAC) (Mariner Data Only)

From the Spectrum window

To create an extracted absorbance chromatogram for a wavelength range from the Spectrum window:

1.Click the Chromatogram window to activate it.

2.From the Display menu, select Traces, then select a DAD TAC or DAD Channel chromatogram.

The TAC or Sig Absorbance trace appears in the Chromatogram window.

3.Select Duplicate Active Trace from the Display menu to keep the original data displayed after processing.

4.Double-click the left mouse button or right-click-drag over an area of interest in the Chromatogram window.

A DAD Spectrum appears in the Spectrum window.

5.Click the Spectrum window to activate it.

6.In the Spectrum window, right-click-drag over the region of interest. The width of the box you draw defines the precise wavelength range used in the extracted absorbance chromatogram.

The extracted absorbance chromatogram is displayed in the Chromatogram window (Figure 4-7)with an XAC trace label and the center mass and window, or the mass range indicated in the trace label.

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Data Explorer™ Software User’s Guide 4-15