Metrohm NIRS XDS Interactance OptiProbe Analyzer - Manual (Page 52)

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Next a sample scan is taken (on the reference) and this box
is displayed. This takes about 20-30 seconds.
Wavelength Linearization is performed in two sections, each
of which takes about 45 seconds.
The user must confirm the linearization to proceed. A dialog
box will appear, and the user should click “Yes” to proceed
to the next step.
Following Wavelength Linearization, the user is asked to
select a standard file. This is provided on the mini-CD in the
standard box. It may be manually copied on the computer in
the Vision directory, as shown.
Select this file and click on “Open”.
Vision prompts the user to insert the WSR10xxx standard
into the instrument.
Insert the WSR10xxx Wavelength Standard Cell when
prompted. Insert the cell in a consistent rotational position
for repeatability.
The probe must be in the center position as shown, and
the WSR standard must be in the drawer on the side of
the instrument. Close the drawer first, then gently lower
the OptiProbe, into light contact with the standard
window. (The drawer is shown open for illustration
purposes only.)
Click “OK” to continue.
This test takes about 45 seconds.
The wavelength response for each defined peak is adjusted, to assure precise wavelength registration
between instruments. At the same time, bandwidth (bandpass) is measured, and is iteratively
adjusted to an optimum value for the peaks measured. This is performed to assure good agreement
from instrument to instrument, should multiple instruments be used for analysis of similar products.