Owner manual

5.6.3 SUBSTANCES
746 VA Trace Analyzer / 747 VA Stand
5-137
Parameter Range; Default value / Meaning
polynom Polynomial baseline with DPMODE, SQWMODE,
AC1MODE, DCTMODE (with SSWEEP):
With a baseline of the polynom type, the curvature of the
peak baseline is approximated by a polynomial curve.
After definition of the peak base points dU.front and
dU.rear and the associated slopes S.front and
S.rear (automatically or by manual entry), the curved
baseline is determined by calculation.
S.rear
S.front
polynom, whole
dU.front dU.rear
expon. Exponential baseline with DPMODE, SQWMODE,
AC1MODE, DCTMODE (with SSWEEP):
The expon. type baseline is suitable for peaks which lie
on an exponentially ascending or descending baseline.
After definition of the peak base points dU.front and
dU.rear and the associated slopes S.front and
S.rear (automatically or by manual entry), the exponen-
tial baseline is determined by calculation.
S.rear
S.front
expon., whole
dU.front dU.rear
AC2 rel. Linear baseline with relative evaluation with AC2MODE:
Curves recorded with AC2MODE are always evaluated
with a linear baseline. The base points dU.front and
dU.rear can be determined automatically or entered
manually, the slopes S.front and S.rear have no
meaning here.
In the relative evaluation, the two peak heights I
f
and I
r
are determined relative to the linear baseline and added
to give the result I.rel.
U / 2
I
f
I
r
AC2 rel.
I.rel =
I
f
+ I
r
dU.front dU.rear
Base point
(front)
Base point
(rear)
Base point
(front)
Base point
(rear)