Teledyne 4220 - Manual (Page 51)

4220 Flow Meter
Section 2 Programming
2-23
Press Exit to leave the program. Then press Enter and reselect
SETUP. The Setup menu will reappear:
SET CLOCK, SITE ID, MEASUREMENT SETUP, PROGRAM
LOCK, PROGRAM are off-screen and can be reached with the
arrow keys. Select LCD BACKLIGHT with the arrow key. Press
Enter. The following will appear:
KEYPRESS TIMEOUT will cause the backlight to be turned on
whenever you press a key on the keypad (other than On and Off).
An internal timer is started that will keep the backlight on for
approximately two minutes after you press a key.
Each time you press a key, the timer is restarted, so the backlight
will never go off as long as you continue to program the flow
meter, with keystrokes coming less than two minutes apart. At
the end of programming, the backlight will go out, and will stay
out until you start to program again.
This feature is designed to conserve battery power by de-ener-
gizing the backlight when it is not needed. The backlight is still
available if it is necessary to program in a dark environment,
such as a manhole. We recommend using this selection if the flow
meter is battery-powered, but installed in an environment where
the lighting is poor.
CONTINUOUS will cause the backlight to be lit continuously.
Where the flow meter is powered by an AC power supply, battery
life considerations do not intervene. If the backlight makes the
display easier to read, use it. Do not use CONTINUOUS in any
installation that is battery-powered, as it will cause rapid dis-
charge of the battery.
OFF will keep the backlight feature turned off under all circum-
stances. Select this option for maximum battery life in installa-
tions where there is sufficient ambient light to read the display
without the backlight feature.
Press Enter. The SETUP menu will return. This time move the
flashing cursor from LCD BACKLIGHT to LANGUAGE.
When LANGUAGE appears on your display, you may select an
alternate language for programming. The other language
depends on how the flow meter was ordered. The following
display will appear:
SETUP OPTIONS: 'EXIT' TO QUIT
• STATUS • • REPORT SETUP • • LCD BACKLIGHT •
LCD BACKLIGHT MODE
• KEYPRESS TIMEOUT • • CONTINUOUS • • OFF •
LANGUAGE
• ENGLISH • • (second language, as ordered) •