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Dionex VWD Operator's Manual
•
Detector exposed to high vibration
Optical detectors are sensitive to vibrations. Make sure the Dionex VWD
installation site is vibration-free.
•
The data collection rate is too fast
Decrease the data collection rate (see
•
The Average parameter is turned off
The Average parameter operates with the Step parameter. A step is the time
interval between two successively stored data points. When you select a Data
Collection Rate, Chromeleon 6.8 automatically sets the step value to the
reciprocal of the data collection rate at the start of data acquisition.
When Average is on (the default setting), Chromeleon 6.8 averages the data
points between step intervals and reports that value. This typically reduces
noise.
When Average is off, Chromeleon 6.8 reports only the last data point of the
step interval. The data points between steps are skipped. Noise is not reduced
in this case.
To verify the Average parameter setting: In the Commands dialog box, scroll
to the signal name (for example, UV_VIS_1). Click the plus sign to expand
the list of commands and parameters for the signal.
4.6
Drifting Baseline
•
Fluctuations in ambient temperature
Make sure the Dionex VWD installation site temperature remains consistent.
Allow at least 6 cm (2.4 in) of clearance behind the Dionex VWD for
ventilation.
•
Mobile phase or post-column reagent is degraded
Prepare all mobile phases and reagents with spectro-grade solvents, reagent-
grade chemicals, and ASTM Type I (18 megohm-cm) filtered, deionized
water that meets the specifications listed in
•
Front cover or lamp cover is missing
Optical components are sensitive to temperature and light. Do not operate the
Dionex VWD unless the front cover and lamp cover are in place.
58
Section
3.5.2).
Table
B-1.
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