Agilent Technologies 8453 Operator's Manual page 359

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
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 10
Derivative Filter 1 - 3
Outputs against Slope Sensitivity
Slope > Slope Sensitivity
Curvature > Slope Sensitivity
Slope < (-) Slope Sensitivity
Slope > |Slope Sensitivity|
Curvature < (-) Slope Sensitivity
Understanding Your Agilent ChemStation
Table 10 on page 85 the expected peak width determines which filter's
Incremental Values to Upslope Accumulator
Integration
Peak Recognition
Filter 1 Filter 2
+8 +5
+0 +2
-8 -5
-4 -2
-0 -2
4
Filter 3
+3
+1
-3
-1
-1
85