Owner manual

5.6.3 SUBSTANCES
746 VA Trace Analyzer / 747 VA Stand
5-131
Parameter Range; Default value / Meaning
Method display only
Method name
Name of the method loaded in the working memory.
Subst# -
Segment#
8 characters;
Substance name and segment name
Name of the displayed substance and the associated segment. To
change the substance name, the softkey <Subst. name> must be
pressed.
The segment name is shown only if the substance has first been
linked to a segment using the softkey <Link to segment>.
Recognition display only
Substance recognition
Title for those parameters which concern recognition of the sub-
stance.
U.verify -3000...3000 mV;
Characteristic voltage
Verification voltage for the assignment of a peak or a wave to a
substance. The voltage aU.peak or aU/2 estimated in a first ap-
proximation must be within the range U.verify ±± U.tol for the
substance to be recognized (see adjacent diagram and section 6.6).
If the characteristic voltage is not known before the first measurement,
this field (or with several substances, these fields) can be left blank.
The first peak or wave found in the segment is then assigned to the
first substance allocated to this segment, the second to the second,
etc.
Following the first measurement, the voltages U.peak or U/2 of the
peaks/waves found in the segment are shown on the softkeys when
the U.verify field is edited and can hence be adopted directly:
XXXXXXXX
--------
The displayed voltage XXXXXXXX is copied to the U.verify field.
U.tol (+/-) 1...150 mV; 30 mV
Tolerance for characteristic voltage
Tolerance of the verification voltage for the assignment of a peak or
wave to a substance. The voltage aU.peak or aU/2 estimated in a
first approximation must be within the range U.verify ±± U.tol for the
substance to be recognized (see adjacent diagram and section 6.6).
With peaks that are close together, it is advisable to choose toler-
ances which are not too large, otherwise an unambiguous assignment
to the substances can no longer be assured owing to the overlapping
ranges.
U.width min 1...(U.width max) mV; 10 mV
Minimum peak width
Minimum peak width for the assignment of a peak or a wave to a
substance. The peak width aU.width estimated in a first approxima-
tion must be larger than U.width min for the substance to be recog-
nized (see adjacent diagram and section 6.6).