HP Data Explorer 4 5.9 Truncating a Spectrum, Truncating, Description

Chapter 5 Examining Spectrum Data

5.9 Truncating a Spectrum

Description

Truncating

5

The Truncate function removes data points from a trace outside a selected region.

Truncating spectra is useful to:

•Mariner data— Remove noise at the low end of a spectrum before generating a result file

•Voyager data— Eliminate the Low Mass Gate spike and background in the low-mass range

To truncate spectra:

1.Display the spectrum to truncate.

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

3.From the Process menu, select Truncate Spectrum.

The Truncate Spectrum dialog box (Figure 5-17)is displayed.

Figure 5-17 Truncate Spectrum Dialog Box

4.Type the starting and ending m/z values for the range of the spectrum to retain, or right-click-drag over the range in the spectrum.

5.Click OK.

5-56 Applied Biosystems