Metrohm NIRS XDS RapidContent Analyzer - Manual (Page 87)

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5
Instrument Fails
Performance Test.
1. Verify that reference paddle is visible in Rapid Content
Analyzer sample window when a reference scan is taken.
2. Temperature and/or humidity may be changing rapidly
during the test. This can usually be observed as large
spectral activity between 1300-1400nm and 1800-1900nm.
If this is the case, the instrument should be tested in a more
controlled setting to verify proper operation.
3. Instrument may be located on a bench with grinders,
stirrers, or other laboratory equipment which produces
vibration or mechanical disturbance. This shows up as
spectral activity in various areas, depending upon the
transmitted frequency of the motion. Turn off all equipment
that might cause such disturbance. Locate it to another part
of the laboratory, or place it on isolated supports away
from the XDS Analyzer.
4. Increasing noise in Performance Test may indicate a
gradually failing lamp. Performance Test is very sensitive to
any optical changes in the instrument, including noise
caused by lamp issues. Be sure the instrument is warmed
up, then run the test again. If it continues to fail, consider a
lamp change to remedy the problem.
6
Instrument fails Instrument
Calibration.
1. Verify that the Wavelength Standard is properly
positioned at the sample port when prompted by software.
Note that Reference Standardization must be performed
before Instrument Calibration. Verify that this has been
done, and that Reference Standardization is checked in the
DCM.
7
Instrument Gain is
excessively high in Gain Test.
1. NIR Gain should always be less than 40 on the reference,
unless extreme lengths of fiber are used. If gain is high,
verify that the reference is in place and operating. (Open
cover if required to verify that reference paddle is in place
on most modules.)
2. Verify that lamp is lit. (see above)