Metrohm NIRS XDS SmartProbe Analyzer - Manual (Page 33)

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When finished sampling, the probe should be
stored in the reference position. This is the proper
position for Performance Test, Gain Test, and
Wavelength Linearization.
Instrument Calibration makes use of an external
wavelength reference. The reference mounts in a
cup holder on the side of the instrument as shown.
(Leave room for easy access.)
Please see the section on Instrument Calibration
for full information.
Reference Standardization requires use of an XC-
1200 Calibrated 99% Reflectance Reference.
Do not attempt to perform this with the R99 from
the XC-1010 Standard Set. Please see the section
on Reference Standardization for full information.