Honeywell AreaRAE Plus, Руководство пользователя

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Keys And Interface
The AreaRAE Plus/Pro has three keys:
In addition to their labeled functions, [Y/+], [MODE], and [N/-] act as “soft keys” that control
different parameters and make different selections within the instrument’s menus. From menu
to menu, each key controls a different parameter or makes a different selection.
Three panes along the bottom of the display are “mapped” to the keys. These change as menus
change, but at all times the left pane corresponds to the [Y/+] key, the center pane corresponds
to the [MODE] key, and the right pane corresponds to the [N/-] key. Here are examples that
show the relationships of the keys and functions:
In addition to the functions described above, any of the keys can be used to manually activate
display backlighting. Press any key when the backlighting is off to turn it on. A subsequent key
press is required to carry out an actual function corresponding to that key.
AreaRAE 23 User Manual