Metrohm NIRS XDS MasterLab Analyzer - Manual (Page 54)

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The instrument “self-
identifies” as an XDS
system with the Tablet
Module. The user should
enter a logical name for
the DCM. (Spaces are
OK.)
Note that the “Spot Size”
should be adjusted if the
vial used is smaller than
21.56mm diameter. The
default spot size is
17.25mm in reflectance.
Normally the beam size
should be set for 80% of
the vial diameter.
For the 15mm vial, use a
12mm spot size.
In Tablet Transmission (covered in a later section) the default spot size is 9.5mm. The default size may
be increased for larger tablets.
Use 32 scans for “Sample” and 32 scans for “Reference.” The instrument scans on each forward
swing and each backward swing of the grating, unlike previous Metrohm instruments. Thus, 32 scans
are accomplished on only 16 grating cycles, and are done rapidly. Click “OK” when finished.
The user will hear a slight ticking sound from the internal order sorter whenever the lamp is on. This
is normal, and has no effect on component life. The parts are kept in motion to reduce “wait time”
before instrument stabilization.
Verify that the box marked “Reference Standardization” is checked. If it is not, the user should return
to Configure, Options and select “Reference Standardization” on that menu before establishing a
DCM.
Click “OK” to exit the dialog box. The DCM information will be saved.