Metrohm NIRS XDS MasterLab Analyzer - Manual (Page 127)

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The wavelengths used for the instrument wavelength profile are well-defined, stable peaks in the
wavelength standard. These are the same peaks used during Instrument Calibration. Wavelength
Certification is a verification that the peaks are in correct positions, and that the peak positions are
consistent over time. Note that both tests use the wavelength standard at the sample plane, where
actual sample measurement is done.
Wavelength Certification is an excellent method to test whether Instrument Calibration needs to be
re-run. If the original settings in Instrument Calibration have drifted, a message will be displayed in
Wavelength Certification that Instrument Calibration should be re-run. Click on the Instrument
Calibration tab to see the results:
In some cases the user may see the message shown. This
indicates that the instrument has passed Wavelength
Certification on the NIST-defined peaks, but has not
passed on the tighter, FOSS-defined wavelength positions.
This is not considered a failure, as the instrument still
passes Wavelength Certification on NIST-defined peaks.
Verify that the instrument is fully warmed-up. If so, and
this test still fails, re-run Instrument Calibration to set the
peaks to proper positions. If required, run Wavelength
Certification to verify that all peaks pass.