Owner manual

6.7 Baseline calculation
746 VA Trace Analyzer / 747 VA Stand
6-15
If two points with identical slope are found, the two points of tangency are
connected with each other to give the linear baseline. If no common slope is
found, the linear baseline is drawn directly through the two base points.
Instead of being determined
automatically, the two base
points dU.front and dU.rear
can also be entered manually by
numeric entry. In contrast, the
two slopes S.front and S.rear
are always calculated automati-
cally, a numeric entry here is ig-
nored.
linear, f.double linear, r.double
• Type = polynom, Scope = whole
In the baseline of type polynom, the curvature of the peak baseline is appro-
ximated by a polynomial curve. With the previously determined peak base
points dU.front and dU.rear as a basis, the two associated slopes
S.front and S.rear are used to calculate the curved baseline.
The two base points
dU.front and dU.rear as
well as the two slopes
S.front and S.rear can
also be entered manually
instead of being deter-
mined automatically.
polynom, whole
dU.front dU.rear
• Type = polynom, Scope = f.double/r.double
This type of baseline is used for the evaluation of overlapping peaks; for the
1
st
peak the type polynom, f.double must be used and for the 2
nd
peak the
type polynom, r.double. The baseline is calculated in exactly the same man-
ner as for polynom, whole. With the previously determined peak base points
dU.front for the 1
st
peak and dU.rear for the 2
nd
peak as a basis, the two
associated slopes S.front and S.rear are used to calculate the curved
baseline.
The two base points dU.front
and dU.rear as well as the two
slopes S.front and S.rear
can also be entered manually
instead of being determined
automatically.
polynom, f.double polynom, r.double
• Type = expon., Scope = whole
With the baseline of type expon., the curvature of the peak baseline is ap-
proximated by an exponential curve. With the previously determined peak
base points dU.front and dU.rear as a basis, the two associated slopes
S.front and S.rear are used to calculate the exponential baseline.
Subtracted
curve
Base point
(rear)
Base point
(front)