Thermo Scientific Dionex ICS Series Operator's Manual page 43

•
If the data collection rate is too slow, the start and end points of peaks
are not accurately determined. If the collection rate is too fast, data
files may occupy excessive disk space and post-run analyses may
require more processing time.
•
In multiple wavelength applications, baseline noise increases at
higher data collection rates, especially if the data collection rate is at
or near the recommended maximum rate. To reduce noise, select a
lower data collection rate. For example, try selecting a rate that is
75% of the maximum recommended.
•
The data collection rate and time constant settings are typically paired
to optimize the amount of data collected and reduce short-term noise,
while still maintaining peak height, symmetry, and resolution.
The Chromeleon 7 Instrument Method Wizard or Chromeleon 6.8
Program Wizard will automatically calculate the data collection rate
and corresponding time constant, based on the value you enter for
peak width at half-height (see
•
The following table lists recommended settings for the data collection
rate and time constant for various peak widths.
Doc. 065377-01 1/12
Width at Half-Height
for the Narrowest
Peak of Interest (Min-
utes)
0.75
0.50
0.25
0.10
0.05
0.01
0.005
3 • Operation and Maintenance
Section 3.5.1).
Data Collection Time Constant
Rate (Hz) (Seconds)
0.5 4.50
0.5 3.00
1.0 1.50
2.5 0.60
5.0 0.30
25.0 0.06
50.0 0.03
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