Metrohm NIRS XDS Process Analyzer – MicroBundle - Manual (Page 67)

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Instrument Calibration uses a traceable,
stable, standard, of known wavelength
response, as a method to establish
wavelength scale response of the instrument.
The instrument is set to scan the standard,
and the nominal peak positions for each
major absorption are determined. Vision
performs an algorithm to set the peak
positions of the instrument to those of the
standard. These adjustments are saved, and
are applied on each subsequent scan of the
instrument, yielding a correct spectrum.
This adjustment is performed in Interactance
Reflectance, and applies to both Interactance
Reflectance and Interactance Immersion.
Vision takes an instrument reference, using
the internal reference fiber. This takes about
20 seconds.
This dialog box is displayed.
Next a scan is taken (on the reference) and this box is
displayed. This takes about 20-30 seconds.