Metrohm NIRS XDS Interactance OptiProbe Analyzer - Manual (Page 51)

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Instrument Calibration uses a stable rare-
earth standard, of known wavelength
response, as a method to establish
wavelength scale response of the instrument.
This standard is directly traceable to NIST
SRM-1920a.
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 wavelength positions are
applied at the sample plane, where samples
are measured or read.
These adjustments are saved, and are applied
on each subsequent scan of the instrument,
yielding a correct spectrum.
This adjustment is performed in reflectance,
using the Interactance Reflectance Probe tip.
Once done, this calibration applies to
Interactance Reflectance and Interactance
Immersion
Vision takes an instrument reference, which
takes about 20 seconds. The Interactance
Reflectance Probe must be in the uppermost
position in the orange holder.
This dialog box is displayed.