Metrohm NIRS XDS MasterLab Analyzer - Manual (Page 73)

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To verify this connection, the user may click on
Diagnostics, Instrument Configuration.
Note that the Amplifier Type is listed as
“Transmittance”. This is the correct setting for tablet
transmission work.
Click on “OK” to exit this screen.
When scanning tablets in transmission, an
aperture is required. This aperture is magnetically
held on the sample deck, and is located with two
short “pegs” that insert into openings machined
in the deck. Clean the sample window if needed.
If the Iris Adapter is in place, please
remove it now.
This aperture prevents unwanted energy from
reaching the tablet transmission detector. This
view shows the aperture ready for placement
into the deck. (The photo below shows it
installed correctly.)