Martel Electronics DPC300A - Manual (Page 12)

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arrow keys (F2 and F3 Keys). The sensor port should be open
(vented) to atmosphere while performing this procedure.
2.4 Other Menu Controlled Functions
There are many ‘sub-main’ menus that can be accessed through the
MORE option of the Main Menu. A ‘sub-main’ menu contains three
options. The first option is unique to the function. The second and
third options of a ‘sub-main’ menu are always the same. The NEXT
option leads to the next ‘sub-main’ menu and the DONE option
returns home . For the last ‘sub-main’ menu the NEXT option wraps
around to home. See Figure 4 for a detailed mapping of the menu
structure.
A note on naming convention:
If a ‘sub-main’ menu has subordinate menus, it will henceforth be
referred to as {function} Main Menu. E.g. the display contrast sub-
main menu will be called the Contrast Main Menu. If not it will be
called the {function} menu.
2.4.1 Setting the Contrast
From the Contrast Main Menu choose the CONTRAST option to
access the Contrast Adjustment Menu.
Use the F2, F3 keys to adjust the display contrast to the desired level
and then use the CONTRAST DONE option to return home.
2.4.2 Locking and Unlocking Configurations
Use the LOCK CFG or UNLOCK CFG option of the Configuration
Lock Menu to lock or unlock the display configuration.
When the LOCK CFG option is chosen the menu display returns
home and the CONFIG option on the Main Menu indicates that it is
locked. Also all menus are locked out with the exception of the Min