HP HP-18C - Starting to Use the HP-18 C; Installing the Batteries; Turning the HP-18 C on and off; Setting the Display Contrast

Starting to Use the
HP-18C
Installing the Batteries
1
The HP-18C is powered by three N-cell alkaline batteries. Batteries
are included with the calculator. If the batteries are not already in-
stalled, follow
the instructions that start on page 185.
Turning the HP-18C On and Off
To turn on the calculator, press I ON I. Pressing I ON 1 again turns the
HP-18C off. Since the HP-18C has Continuous Memory, turning it off
does
not affect the information you've stored there.
To conserve energy, the HP-18C turns itself off ten minutes after you
stop using it.
If you see the low battery symbol (c::::J) at the top of the display,
you
should replace the batteries as soon as possible. Follow the in-
structions
starting on page 185.
Setting the Display Contrast
The display brightness and sharpness depend on lighting, your view-
ing angle,
and the display contrast setting . To change the display
contrast,
hold down the I ON 1 key while you press [I) or [I] .
1: Starting to Use the HP-18C 15