Metrohm NIRS XDS Process Analyzer – SingleFiber - Manual (Page 71)

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When prompted, position the WST3WCAL Wavelength
Standard in the standard area as shown. Always orient
the standard in the same direction.
Click “OK” to continue. This test takes about 45
seconds.
The wavelength response for each defined peak is adjusted, to assure precise wavelength registration
between instruments. At the same time, bandwidth (bandpass) is measured, and is iteratively
adjusted to an optimum value for the peaks measured. This is performed to assure good agreement
from instrument to instrument, should multiple instruments be used for analysis of similar products.
At the end of the test this dialog box is displayed. Click “OK” to
exit Instrument Calibration.
Information about the WST3Wxxx Transmission Wavelength Calibration Standard:
The transmission wavelength standard used is
traceable to NIST SRM-2035, through direct
comparison on the Metrohm Master
Transmission Instrument.
The optical materials used in the WST3Wxxx
Calibration Standard have very sharp bands,
which are found to be stable and repeatable.
The Master Instrument was first calibrated using SRM-
2035, and the resulting peak positions of the WST3Wxxx
standard were determined. Each calibration standard is
verified for correct response prior to shipment. The
correlation of the calibration standard to SRM-2035 is
checked on a regular basis to assure consistent response.
The XDS instrument is set to predetermined nominals
during Instrument Calibration, since these are the best-
known information for NIR peak wavelengths.
In Wavelength Certification, the NIST-stated uncertainty of
1.0nm is applied.