Metrohm 746 VA Trace Analyzer - Manual (Page 465)

6 Data processing and evaluation
746 VA Trace Analyzer / 747 VA Stand
6-2
6.2 Preparations before start of a determination
The following three points constitute the preparations before the start of a determi-
nation:
• Method definition
Definition of all functions and parameters applicable to the determi-
nation by loading an existing method or developing a new method.
• Definition of the sample size
Entry of the sample size on the dialog page ”MONITORING” or
”SAMPLES”.
• Method-independent settings
Additional, method-independent settings for the sequence of the
determination.
6.2.1 Method definition
The sequence of a determination is defined in the method loaded in the working
storage, which involves the following 5 dialog pages summarized under the title
”Method specifications”:
– OP. SEQUENCE Main program (see section 5.6.1)
– SEGMENTS Segment program (see section 5.6.2)
– SUBSTANCES Substance parameters (see section 5.6.3)
– CALCULATION Calculation formulae (see section 5.6.4)
– DOCUMENTATION Report and curve output (see section 5.6.5)
Before the start of a determination, you must load the desired method from the
method memory or the data card into the working storage. If desired, you can mod-
ify this method to suit your needs or even redevelop it completely.
The functions and parameters of the 5 method dialog pages relevant for the deter-
mination are described in detail in section 5.6. In what follows, the most important
functions and settings of these pages will be summarized again in brief:
• OPERATION SEQUENCE
On this dialog page program instructions and their parameters (see section
5.7.3) are used to define the sequence of a determination. The most impor-
tant instructions include:
SMPL … … Addition of the sample volume
DOS … … Addition of auxiliary solutions
PURGE Purging of the analysis solution
STIR Stirring
SEGMENT Call-up of segments
(REP … …REP)n Replications (repetitions)
(ADD … …ADD… …ADD)n Definition of standard additions
(CAL … …CSOLN… …CAL)n Definition of calibration curves