Metrohm NIRS XDS Process Analyzer – SingleFiber - Manual (Page 69)

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10.4.3 Instrument Calibration, Transmission Pair
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.
This adjustment is performed in Transmission,
using the calibration jig for the fiber bundles
as shown.
For instruments that ship as of late 2004, a
calibrated wavelength standard (XC-1300) is
used, with serial number WST3Wxxx.
Vision takes an instrument reference, using
the internal reference fiber. This takes about
20 seconds.