Metrohm NIRS XDS MasterLab Analyzer - Manual (Page 159)

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7
Instrument fails Instrument
Calibration.
1. Verify that the Wavelength Standard is properly
positioned in the holder when prompted by
software.
2. Verify that the Windows or WINNT directory (on
the C:\ dive) contains a file named “Sys3.ini”. This
file contains parameters needed in Instrument
Calibration. If this file is not located in the
directory, Vision may not operate correctly in
Instrument Calibration.
The installer and user must have proper permission
to this directory when Vision is installed. See
section 3.0 for more information. If the “Sys3.ini”
file is not found, Vision should be re-installed by a
person having correct access to the Windows
directory.
As new instruments are released by Metrohm
NIRSystems, the Sys3.ini file is updated. An older
file may not support use of new instruments.
Therefore, permission is required.
8
Instrument Gain is excessively
high in Gain Test.
1. NIR Gain should always be less than 80 on the
reflectance reference. Transmission is much higher.
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)
3. If working in transmission, verify that the beam is
not blocked.
The image at left shows typical readings when no energy
is reaching the detector(s). Gain Factor is excessive.
This may sometimes occur when a new computer is
connected, and that computer has no prior knowledge of
amplifier selection. See the instructions given in Item #3 in
Troubleshooting, “MasterLab Analyzer appears to ‘lock
up’ upon successful connection.