Metrohm Vision – Diagnostics - Manual (Page 27)

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Use Auto-Linearization:
Maintains correct wavelength registration automatically, using internal wavelength materials to keep
instrument in precise adjustment over time.
Reference Standardization:
Used to create a virtual 100% reflectance reference, using a traceable photometric standard. This is
explained in the next section. This feature must be used to assure method transferability on XDS
instruments, and to aid in transfer on other models run in reflectance.
Blank Correction:
This is used to create a correct transmission reference on transmission systems (such as the XDS
Rapid Liquid Analyzer). With this option chosen, the system takes a scan of the sample chamber and
the reference chamber, then applies a correction factor. It is explained more fully in the XDS RLA
manual. It is recommended for Calibration Transfer.
Master Standardization:
This method is typically not used.
Use Instrument Calibration (XDS only):
This is a method to adjust the instrument wavelength profile to an external, traceable wavelength
standard. This feature must be used on the XDS to assure method transferability.
Use Window Correction (XDS only):
Select this when using the XDS Process instrument with either Transmission Pair, or Interactance
Immersion probes. This option should not be used with Interactance Reflectance.
4.1 Creating a Reference Standard
The instrument should be fully warmed-up,
tested and operating correctly when creating a
reference standard, to eliminate any chance of
error. Click on Create Reference Standard
Vision software stores the
Reference Standard file, which is
downloaded to the instrument,
and is applied as a correction to
each spectrum. Please refer to the
Installation and User manuals on
how to carry out Reference
Standardization on XDS Process
Analytics Instruments.
Follow these steps to create a
reference standard for laboratory
instruments:
Select Diagnostics, Reference Standard, Create Reference Standard.