Agilent InfinityLab LC Series RID User Manual 122
8 Test Functions
ASTM Drift and Noise Test
Evaluation
For the Instant Pilot Rescale the plot and measure the baseline noise and drift on
the screen. If a printer is configured for the instrument the plot can be printed by
pressing the
m
key and selecting
Print Plot
.
The following values are calculated automatically by the Agilent ChemStation.
•
Noise (ASTM): The short term noise in nRIU based on ASTM method
E-1303-95 Practice for Refractive Index Detectors used in Liquid
Chromatography using 0.5 minute segments.
•
Wander:The long term noise in nRIU based on ASTM method E-1303-95
Practice for Refractive Index Detectors used in Liquid Chromatography using
0.5 minute segments.
•
Drift: The drift in nRIU/hour based on ASTM method E-1303-95 Practice for
Refractive Index Detectors used in Liquid Chromatography measured over 20
minutes.
Factors that will affect the baseline stability include:
•
Variations in the optics or eluent temperature
•
Pressure fluctuations in the sample cell
•
The quality of the water used
•
Air bubbles in the flow cell
For diagnosing signal problems refer to chapter "Troubleshooting and
Diagnostics".
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