Metrohm NIRS XDS Transmission OptiProbe Analyzer - Manual (Page 62)

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After the reference scan, Vision requests the
T013xxxx standard from the set.
Select the requested standard from the set.
Labels on top of each standard identify the
standard value.
Insert the standard into the fixture, in the same
orientation as was done for IPV Setup. If the
standard is reversed, it may have a detrimental
effect upon photometric response.
Cover the standard and click on “OK”.
When the T01 standard has been scanned, the
result will be plotted as shown. (The sharp
peaks are due to absorptions in the filter
material.)
In this picture, the upper and lower spectra are
tolerances from the initial IPV Setup spectrum.
The IPV Setup spectrum is the dark spectrum in
the middle, displayed in black on screen.
The lighter spectrum in the middle (red on
screen) is the current spectrum. It should be
within the upper (blue) and lower (green)
spectra as shown.