THE KEYPAD
The keypad (see Figure 2–1) of the Model 3411-B Advanced
Control Unit (ACU) consists of ten keys — an eight-function
keypad and the 〈ON/YES〉 and 〈OFF/NO〉 keys – and a backlight
switch. The gauge is equipped with a beeper to verify keystrokes. If
a beep is not heard when a key is pressed, the keystroke was not
recognized and should be repeated. The 〈ON/YES〉 and 〈OFF/NO〉
keys are used for responses to specific questions displayed on the
screen and to turn the gauge on and off.
The up and down arrows allow the operator to scroll through
various function lists displayed by the gauge.
The backlight switch toggles the display backlight on and off.
MA
PR
TIME
STD
START
ENTER
ON
YES
OFF
NO
3411B
Advanced
Control Unit
<READY> 1 min @
Depth: 12 inches
BACKLIGH
SWITCH
BATTERY
CHARGER
CONNECTOR
Figure 2–1. Model 3411-B ACU Keypad
2–2
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