Metrohm 827 pH lab - Manual (Page 22)

3.3 Operating principles
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826/827 pH meter, Instructions for Use
3.3 Operating principles
3.3.1 Configuration and method parameters
Instrument configuration and parameters for the pH mode (no adjusta-
ble parameters are required for the measuring modes U (mV) and T
(°C)) are each contained in menus with a tree structure. These menu
structures are shown in the appendix in Section 9.2.
The instrument configuration of the pH meter is described in the menu
<< config >>. This contains the basic settings that apply for all mea-
suring modes. The parameters for the pH mode are stored in the menu
<< param >>.
The change from the measured value display to the menu display is
made by selecting the corresponding menu and confirming with the
<OK> key. The title of the submenu appears first, and is shown with
an '>' (e. g. >report). You can now move the selection bar up and
down with the <  > and <  > arrow keys. Each underlying level in the
menu structure is opened with <OK> and exited with <QUIT>. Altera-
tions to individual entries must be confirmed with <OK>. If such altera-
tions are exited with <QUIT> then they remain ineffective.
If an entry is confirmed with <OK> then the selection bar will move to
the next entry. At the end of a submenu it will finally change to the next
point of the superior menu selection.
In this way you can run through the complete menu structure for the
configuration and parameters by repeatedly pressing the <OK> key.
This can be helpful when carrying out checks.
Not all parts of the menu structure described below are visible in the
display at all times. Only the specific possible settings of the option
which is currently activated are shown. For example, the various set-
tings for printing under configuration/print/print crit. are not vis-
ible when printing has been deactivated completely (off). If one of the
other printing criteria is selected then the particular settings it requires
will appear in the display.
3.3.2 Editing menu entries
A basic differentiation is made between two types of menu entry.
Entries with a fixed selection are indicated by a colon:
print crit.: immed., time, drift, change, off
The selection is then made with the arrow keys and confirmed with
<OK>.
Entries which can be edited are altered by entering a new value and
confirming it with <OK>.