Metrohm 796 Titroprocessor - Manual (Page 91)

5. Methods and determinations
796 Titroprocessor, Instructions for use 85 85
5.3.3 System variables
A determination produces the following system variables which are available
for calculations :
MNR$$ mean value of the results R$$ in statistics memory
MNX$$ mean value of the intermediate results X$$ in statistics
memory
MNC## mean value of the common variables C##
ID1 sample identification 1 (only numerical entries)
ID2 sample identification 2 (only numerical entries)
ID3 sample identification 3 (only numerical entries)
SS sample size (without units)
DD determination duration in s
$RN sample number
$AS autostart counter
$BC buffer counter
5.3.4 Determination files
Data produced during a determination are stored in a file in the working
memory while the determination is proceeding. The name of the
determination file and (optionally) file comments belonging to it are created
automatically according to the settings on the configuration page. Various
masks with combinations of determination time, sample number or sample
identifier, etc. are available, see page 35f.
If the statistics function is switched off (see below) the file of the current
determination will always be kept in the working memory until a new
determination has been started.
After the start of a determination the determination data (results, curves,
etc.) of the previous determination are no longer contained in the working
memory. The current determination file in the working memory cannot be
deleted and remains in existence – just like the current method – even when
the instrument is switched off. An exception to this is the initialization of the
statistics function, see below.
Statistics function
If the statistics function is switched on then the statistics counter limit
determines the number of the determination files which can be present in
the working memory (Statistics 'on' 1 of '10' => max. 10 files
in the working memory). Up to 20 determination files can be contained in
the working memory.
If during a sample series the statistics counter becomes filled up with the
number of determinations carried out then at the start of the next (surplus)
determination the statistics will automatically be initialized again. This means
that the working memory will be completely emptied and can start to be
filled up again with the following determinations.
The statistics can be initialized manually and in this way the working
memory (together with the current determination) can be totally cleared. This
process is recommended before a sample series is carried out. Select
Statistics 'rst'
on the main page (this is not possible in the status
window).