The Peak Recognition Algorithm - Agilent Technologies 8453 Operator's Manual

When data is bunched, the data points are bunched as two raised to the
bunching power, i.e. unbunched = 1x, bunched once = 2x, bunched twice = 4x
etc.
Bunching is based on the data rate and the peak width. The integrator uses
these parameters to set the bunching factor to give the appropriate number of
data points
Bunching is performed in the powers of two based on the expected or
experienced peak width. The bunching algorithm is summarized in
page 83.
Table 9
Expected Peak Width
0 - 10 data points
8 - 16 data points
12 - 24 data points
16 - 32 data points
24 - 48 data points
32 - 96 data points
64 - 192 data points

The Peak Recognition Algorithm

The integrator identifies the start of the peak with a baseline point
determined by the peak recognition algorithm. The peak recognition algorithm
first compares the outputs of the peak recognition filters with the value of the
initial slope sensitivity, to increase or decrease the up-slope accumulator. The
integrator declares the point at which the value of the up-slope accumulator is
≥15 the point that indicate that a peak has begun.
The peak recognition algorithm is shown in
Understanding Your Agilent ChemStation
Table 9 on page 83.
Bunching Criteria
Filter(s) Used
First
Second
Third
Second
Third
Third, second
Third, second
Figure 8
Integration
Peak Recognition
Table 9
Bunching Done
None
None
None
Once
Once
Twice
Three times
on page 84.
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on
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