Metrohm NIRS XDS Process Analyzer – DirectLight/NonContact - Manual (Page 80)

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NOTE: The DCM must be created with “Reference Standardization” checked in the
“Project Options” box. If the DCM was created prior to selection of “Reference
Standardization”, then it was checked, the DCM will not apply Reference
Standardization.
NOTE: Cleanliness of the probe window is very important when this program is run. If
the window is not extremely clean, the character of the window contamination will be
imparted to the reference correction. Therefore, maintain a clean window at all times.
The Interactance Reflectance Probe Barrel should be left in place for Instrument Calibration, which
follows.
11.2.3 Instrument Calibration, Interactance Immersion
First select the channel. From the menu bar, click
on Acquire, then Select Channel. Use the spinner
to select the correct channel, then click on “OK”.
This must be performed for each channel. Always
verify the channel before proceeding with the test.
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.