Metrohm NIRS XDS MasterLab Analyzer User Manual
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that in tablet transmission, some sample positions are not available because the reference standard
takes up one or two tablet positions. Vision will not permit selection of these positions when the
Transmission detector is selected in the Data Collection Method (DCM).
The 15mm (4x5) vial diameter is shown as an example:
The setup screen for sampling is straightforward and easy to use. An example is shown:
Step by step instructions are given later in this manual. Please see Section 6.2 for full information.
It is important that the “spot size” adjustment be set up properly for a given vial size, operating in
reflectance. This is also covered in the section on Vision. Normally spot size should be no larger than
80% of vial size. However, this is not pre-set, as users may wish to scan a smaller area.
In Tablet Transmission, spot size should always remain 9.5mm, which is the default setting in
transmission with this instrument. This setting provides maximum energy to the tablet sample, and
provides best measurement sensitivity.
DO NOT OPERATE OR TROUBLESHOOT WITH THE LID OPEN. SUNLIGHT MAY CONFUSE
THE OPTICAL INTERRUPTERS USED TO POSITION THE SAMPLE CARRIAGE. THIS MAY
CAUSE AN “X-Y POSITIONING ERROR” TO BE REPORTED.