Identifying The Cardinal Points Of A Peak - Agilent Technologies 8453 Operator's Manual

4
Integration
Overview

Identifying the Cardinal Points of a Peak

The integrator determines that a peak may be starting when potential baseline
points lie outside the baseline envelope, and the baseline curvature exceeds a
certain value, as determined by the integrator's slope sensitivity parameter. If
this condition continues, the integrator recognizes that it is on the up-slope of
a peak, and the peak is processed.
Start
1 Slope and curvature within limit: continue tracking the baseline.
2 Slope and curvature above limit: possibility of a peak.
3 Slope remains above limit: peak recognized, cardinal point defined.
4 Curvature becomes negative: front inflection point.
Apex
1 Slope passes through zero and becomes negative: apex of peak, cardinal
2 Curvature becomes positive: rear inflection point.
End
1 Slope and curvature within limit: approaching end of the peak.
2 Slope and curvature remain within limit: end of peak, cardinal point
3 The integrator returns to the baseline tracking mode.
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point defined.
defined.
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