Metrohm 746 VA Trace Analyzer User Manual

Page 288

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

and I

are determined relative to the linear baseline and added
to give the result

I.rel

AC2 rel.

I.rel =

+ I

dU.front dU.rear

Base point

(front)

Base point

(rear)

Base point

(front)

Base point

(rear)