Waters ACQUITY UPC2, Обзор и руководство по обслуживанию, Страница: 15 / 84

Overview 11
Lower filter-time constant settings produce these effects:
• Narrow peaks, with minimal peak distortion and time delay
• Very small peaks may become more difficult to discriminate from
baseline noise
• Less baseline noise is removed
Higher filter-time constant settings produce these effects:
• Greatly decrease baseline noise
• Shorten and broaden peaks
For the highest resolution, select an appropriate sampling rate for your
separation and choose a fast filter-time constant. For the highest sensitivity,
select an appropriate sampling rate for your separation and choose a normal
filter-time constant.
The following figure shows the relationship between increased filter-time
constant and absorbance.
5 0.800 0.400 0.200
10 0.400 0.200 0.100
20 0.200 0.100 0.050
40 0.100 0.050 0.025
80 0.050 0.025 0.0125
Digital filter settings for data rates: (Continued)
Data
Rate
Slow Normal Fast