Thermonicolet Omnic Software User's Guide 6.1 (PDF) - Charles E ...

If Preview Data Collection is turned on in the Experiment Setup dialog box,
preliminary data collection begins and the data are displayed in the Collect
Background window. If you are satisfied with the data, start the background
data collection by clicking the Start Collection button. If you don’t want to
collect a background spectrum, click the Stop button to end the procedure.
• If a message asks you to prepare to collect the background, remove any
sample from the beam path (or install the background material) and then
choose OK. If you choose Cancel, the data collection procedure will end.
• If data collection is finished and the Collect Background window is
displayed, you can move the spectrum to a spectral window so that you can
use it in operations. To do this, select an option from the window selection
box at the top of the Collect Background window and then choose Add.
Note
Note
You can select an option from the window selection box while data are being
collected. You will be asked if you want the collected spectrum placed in the
window you specified. ▲
If you don’t want to add the spectrum to a spectral window, close the Collect
Background window. The spectrum is not saved but remains the current background. ▲
• If a message asks whether to add the spectrum to a spectral window,
choose Yes to add the background spectrum to the indicated window;
choose No to end the procedure without saving the spectrum; or choose
More Scans to return to the Collect Background window. To view
information about collection problems, choose View Collect Status.
Note
If you want to this background to be available when you select a background
handling option later, use Save As to save it on the hard disk after adding it to a
spectral window. See “Saving a spectrum using a new filename” in the “File”
chapter for more information. ▲
Displaying
the current
background
spectrum
Use Display Background in the Collect menu to display a copy of the current
background spectrum in the active spectral window. This lets you visually check
the quality of the background and look for water and carbon dioxide or other
contaminants. Using a background spectrum of poor quality or one collected with
another technique will often cause undesirable spectral features to appear in your
sample spectra.
Note
Note
The current background in memory is not affected by changes you make to the
displayed copy of it. ▲
Since there must be a spectral window in which to display the background
spectrum, the command is not available if no spectral window exists. You can use
New Window in the Window menu to create a spectral window. See “Creating a
spectral window” in the “Window” chapter if you need help. ▲
158 Thermo Nicolet