Understanding Your Agilent ChemStation 85
Integration
4
Peak Recognition
t6 • Peak valley found and upslope counter is greater than or equal to 2 or
• Downslope sigma is greater than twice peak end sigma or
• Baseline reset now or
• Baseline reset next valley and peak valley found
t7 Downslope criterion is no longer met
t8 Downslope criterion is met again
t9 • Peak valley found and upslope counter is greater than or equal to 2 or
• Downslope counter equals zero or
• Downslope sigma is greater than peak end sigma or
• Baseline reset now or
• Baseline reset next valley
t10 Upslope counter is greater than or equal to 2
t11 Upslope counter is less than or equal to 1
Peak Start
In Table 10 on page 85 the expected peak width determines which filter’s
slope and curvature values are compared with the Slope Sensitivity. For
example, when the expected peak width is small, Filter 1 numbers are added
to the up-slope accumulator. If the expected peak width increases, then the
numbers for Filter 2 and, eventually, Filter 3 are used.
When the value of the up-slope accumulator is ≥15, the algorithm recognizes
that a peak may be starting.
Table 1 0 Incremental Values to Upslope Accumulator
Derivative Filter 1 - 3
Outputs against Slope Sensitivity
Filter 1 Filter 2 Filter 3
Slope > Slope Sensitivity +8 +5 +3
Curvature > Slope Sensitivity +0 +2 +1
Slope < (-) Slope Sensitivity -8 -5 -3
Slope > |Slope Sensitivity| -4 -2 -1
Curvature < (-) Slope Sensitivity -0 -2 -1
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