Metrohm NIRS XDS Process Analyzer – DirectLight/NonContact - Manual (Page 76)

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standard from 100% reflectivity are mapped, and a photometric correction is generated. This
correction is then applied to every spectrum taken on the sample channel, to make each spectrum
appear as if taken with a reference of 100% reflectance. This assures that bright samples do not
saturate the instrument, or produce negative absorbance values.
Vision software stores the Reference Standardization file, which is downloaded to the instrument,
and is applied as a correction to each spectrum.
Note that Reference Standardization must have been selected under Configure, Options, for this to
take effect. Once selected, a new Data Collection Method (DCM) must be created for Reference
Standardization to be checked in the DCM box. It is not applied to a DCM retroactively.
When Reference Standardization is selected under Configure, Options, a Reference Standard must be
created for every sample channel that is “Used” even if the probe style is not Interactance Immersion.
See the sections on these probes for full information.
Follow these steps to create a Reference Standardization on channels using Interactance Reflectance.
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.
Select Diagnostics, Reference
Standard, Create Reference
Standard.
Vision takes an instrument
reference scan.
The XDS instrument has an
internal reference fiber,
which is selected for this
operation.
Vision requests that the Certified Reflectance
Reference be scanned.