Metrohm viva 1.1 (ProLab) - Manual (Page 38)

2.3 Formula editor
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viva 1.1 (for process analysis)
Variation refers to a measurement after modification of the measuring
solution, e.g., after a standard solution has been added.
Replication refers to an identical repetition of a measurement.
The following rules apply for this:
￭ Variation index only after the measuring command has been
called up with CALL VA
A variation index is attributed only to those peak evaluation results for
which the measuring command has been called up by a CALL VA call
command.
￭ Increasing the variation index with ADD STD
The peak evaluation results of a measuring command are assigned a
variation index, which is increased with the corresponding ADD STD
or ADD SAMPLE DT command.
￭ Increasing the replication index with loops or several measur-
ing cycles
The peak evaluation results of a measuring command are assigned a
replication index, which is increased with repetitions because of loops
(LOOP command) around a measuring command or because of sev-
eral measuring cycles within a CVS, CPVS or CP command.
￭ Both indices begin with 1
Variation index and replication index both start with 1.
￭ Increasing the variation index sets the replication index to 1
Increasing the variation index automatically causes the replication index
to be reset to 1.
￭ Increasing the variation index only if the previously added
solution contains at least one substance to be determined
When an ADD STD command is run through, the substances con-
tained in the solution are identified on the basis of the name of the
standard solution in the standards table. The respective measuring
command is subsequently determined in the table of substances and
the variation index is increased by 1 when this measuring command is
run through.
￭ Increasing the variation index only once if two substances are
added to two separate solutions
If two substances are added to two different solutions with two differ-
ent ADD STD-type commands and detected in the same measuring
command, then the variation index is increased only once for this mea-
suring command.
￭ Increasing the variation index for all measuring commands
when the same substance is added
If a standard solution containing a substance that is to be determined
in different measuring commands is added using the ADD STD com-
mand, then the variation index for this substance is increased in all
measuring commands.