Waters 2998, Operator'S Manual

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1-12 2998 PDA Detector Optics Principles
The readings are averaged and reported as a single data point. The baseline
noise decreases as the number of exposures/sample increases.
Tip:
The amount of data stored is based on wavelength range, spectral
resolution, runtime, and sample rate. Specify these parameter values in the
General tab of the PDA Instrument Method Editor. For details, refer to the
Empower or MassLynx online Help.
Filtering data
In the General tab of the PDA Instrument Method Editor (for details, refer to
the Empower or MassLynx online Help) you can apply an optional noise filter
(via the Digital Filtering parameter) to the data acquired. The following table
lists the digital filter settings for the allowable data rates.
Tip:
For best chromatography resolution, choose Fast to avoid peak
broadening.
Digital filter settings for data rates
Data
Rate
(Hz)
Slow
(sec) Normal
(sec) Fast
(sec)
Range (sec)
Increment
(sec)
1 4.000 2.000 1.000 No filter, 0.100 to
5.000
0.100
2 2.000 1.000 0.500 No filter, 0.100 to
5.000
0.100
5 0.800 0.400 0.200 No filter, 0.100 to
2.000
0.100
10 0.400 0.200 0.100 No filter, 0.100 to
1.000
0.100
20 0.200 0.100 0.050 No filter, 0.050 to
0.500
0.050
40 0.100 0.050 0.025 No filter, 0.025 to
0.250
0.025
80 0.050 0.025 0.0125 No filter, 0.0125 to
0.100
0.0125