Metrohm Vision – Diagnostics - Manual (Page 30)

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A final spectrum (green when plotted on-screen)
is plotted to verify that the corrected spectrum
produces the same results as the Certified
Reflectance Reference.
Click “Close Report” to continue. The correction
is automatically downloaded, and is saved in the
Diagnostic Database. The correction will be
applied in real time to all spectra taken with a
DCM where “Reference Standardization” is
checked.
Note that cleanliness of the sample window and probe tip is very important when this program is
run. If the window or probe tip is not extremely clean, the character of the window contamination
will be imparted to the reference correction. Therefore, maintain a clean window and probe tip at all
times.
4.2 Loading a Reference Standard
The reference standardization file is stored in the Diagnostic Database, attached to the record for the
instrument configuration under which it was taken. If the instrument configuration is changed, then
returned to the original configuration, the reference standardization file must be re-loaded to the
instrument. Click on Load Reference Standard to download the correction to the instrument. A
confirmation of successful download appears. From this point, any spectrum taken in a reference
standardized project will have the correction applied.
The database supports multiple reference standards, such as one for each reflectance configuration.
The instrument, however, only can hold one reference standardization file at a time. Therefore, when
the instrument configuration is changed, the reference standardization file must be reloaded. The
model 5000 and 6500 instruments, however, can only hold one reference standardization file at a
time. Therefore, for model 5000 or 6500 instruments only, when the instrument configuration is
changed, the reference standardization file must be reloaded as given in the next section. For XDS
instruments, up to nine sets of reference standardization and instrument calibration data are stored
on the motherboard of the instrument. When the XDS instrument configuration is changed, the
software recognizes it, and the appropriate Reference Standardization files are applied.
4.3 Reset Reference Standard
(not applicable to xds analyzers)
When a sampling module is changed on a model 5000 or 6500 instrument, new reference
standardization is required for the module being used. (Only one is stored in the instrument.) First,
change the module; perform Wavelength Linearization, then Performance Test. If these tests are
successful, click on Reset Reference Standard to remove the existing correction from the instrument.
Click on Create Reference Standard, then Load Reference Standard to download the new file to the
instrument.