Martel Electronics BetaGauge 301 - Manual (Page 10)

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2.2 Using the Backlight
The backlight is controlled by the dedicated backlight key. It toggles on and off when the
key is pressed; this is one of the few functions that cannot be controlled by the serial
interface.
2.3 Using the Zero Function
When the ZERO_KEY is pressed, the calibrator will zero the current display if a pressure
mode is selected, and the pressure is within the zero limit.
2.3.1 Internal Sensor and Pressure Module (non-absolute)
When a sensor or module is selected on the current display and the ZERO_KEY is
pressed the calibrator subtracts the current reading from the output.
2.3.2 Absolute Pressure Module
When an absolute pressure module is selected on the current display and the ZERO_KEY
is pressed the calibrator prompts the user to enter the barometric reference pressure.
This is done using the arrow keys (F2 and F3 Keys).
2.4 Other Menu Controlled Functions
There are eight ‘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 arrow keys to adjust the display contrast to the desired level and then use the
CONTRAST DONE option to return home.