BUCHI NIRCal - Manual (Page 78)

NIRCal 5.5 Software Manual
78 NIRCal 5.5 Manual, Version A
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When the selection is created, the spectra can be copied to the calibration spectra, the
validation spectra or the user spectra.
1. press the right mouse button in the graphic and Copy Selection to – Row - Calibration
Spectra;
2. for setting the Validation Spectra select in the Popup-Menus the command Invert Selection.
The rest of the spectra will be selected;
3. copy this selection in the Popup-Menus with the command Copy Selection to – Row -
Validation Spectra.
NOTE
The function “Copy Selection to” overwrites the existing selection in the data sets.
Add and Remove Selection from Dataset
Mark the spectra, which should be removed from a selection.
Press the right mouse button and use "Add / Remove Selection to". This will enlarge or reduce the
previously selection with the new spectra.
NOTE
By copying, adding and removing spectra to (from) the sets, a homogeneous distribution between
calibration and validation spectra over the whole concentration range can be achieved.
3.3.6 Wavelength Data Set
The exact wavelength / wavenumber range depends on the instrument type used for the spectrum
measurement and their settings (e.g. resolution).
The selected wavelength / wavenumber range depends on the application and the measuring option
used. The calibration wavelengths define the spectrum range used by the mathematical algorithms,
PCA, PCR or PLS.
Calibration Wavelengths are the wavelengths used to create the calibration model.
Removing certain wavelengths from a calibration can lead to some improvement.