Metrohm NIRS XDS Process Analyzer – MicroBundle - Manual (Page 89)

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Next a 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 15 seconds.
Following Wavelength Linearization, the user is asked to
select a standard file. This is located on the computer in
the Vision directory, as shown.
Select the file “TSS3Wxxx” and click on “Open”.
Vision prompts the user to position the probes in the
fixture as shown.
To avoid stray light reaching the probes, the center area
may be covered to avoid light infiltration. The cover
shown is for this purpose.
When prompted, position the WST3Wxxx Wavelength
Standard in the probe area as shown.
NOTE: Slide the probes outward to allow insertion of
the WST3Wxxx Standard into the fixture. Observe that in
the photo above, the left probe extends inward and will
block insertion of the WST3Wxxx standard, if not
retracted slightly.
Re-insert the probes when the standard is in position.
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.