Metrohm NIRS XDS Transmission OptiProbe Analyzer - Manual (Page 53)

▪▪▪▪▪▪▪ 51
possible. Be sure no sample material is in the cell, and that the probe windows are clean.
If the probe barrels are inaccessible, or cannot be cleared, the special calibration fixture must be used
for Wavelength Linearization. This is shown in the next frame.
NOTE: If using the Vial Heater Module or a
separate sample cell, there is a separate
procedure required after mounting the probes
into the final configuration.
See section 7.1.4 for information on this step.
7.2 Evaluation Diagnostics
Evaluation Diagnostics are used to verify that the instrument is operating within allowable
parameters. These tests should be run approximately once per week.
This information is meant to guide the user through the tests in an expeditious manner. A more
complete description of these tests is given in the Vision Manual, in the Diagnostics section. A
discussion of the theory and interpretation of results is provided in the Vision manual.
7.2.1 Performance Test
Performance Test is a comprehensive test of instrumental performance, and is the final assurance that
the instrument is ready to run samples. The key items verified during this test are:
• Instrument Noise in each of four wavelength regions
• Internal Wavelength Performance (wavelength positions on non-traceable, internal reference
materials.)
• Internal Wavelength Precision (Repeatability)
• NIR Gain
• Visible Gain
The test is initiated as follows:
Select Performance Test from the
Diagnostics menu. Click on Run
Performance Test.
As the test runs, a screen like that shown below is displayed. Upon test completion, a message box is
displayed to indicate test completion and status.