Waters ACQUITY UPC2, Overview And Maintenance Manual, Page: 16 / 84

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Filter-time constant comparison:
Tip:
Although the peak shape shows some distortion and the signal output is
delayed with different filter-time constants, the peak area remains the same.
Selecting the appropriate sampling rate
A sufficient number of points must fall across a peak to define its shape. Thus,
at very low sampling rates, the definition between peaks is lost. Empower
software uses the index of the data point closest to the end time, minus the
index of the data point closest to the start time, to calculate the Points Across
Peak value for each integrated peak in the chromatogram.
The Points Across Peak value
The Points Across Peak value appears in the Peaks table, at the bottom of the
Review Main window. If the Points Across Peak field is not visible, right-click
anywhere in the table, and then click Table Properties. Click the Columns tab,
and then scroll down to find the Points Across Peak field. Clear the check box,
and then click OK.
0 sec
1 sec
2 sec
Time (minutes)
Absorb
ance