Users Guide

90  Ergonomic instructions
Ergonomic instructions
CAUTION: Improper or prolonged keyboard use may result in injury.
CAUTION: Viewing the monitor screen for extended periods of time
may result in eye strain.
For comfort and efficiency, use the ergonomic guidelines when setting up
and using your computer.
Laptops are not necessarily designed for continuous operation as office
equipment. If you intend to use you laptop continuously, it is recommended
that you connect an external keyboard.
• Position your computer so that the monitor and keyboard are directly
in front of you as you work. Special shelves are available (from Dell and
other sources) to help you correctly position your keyboard.
• Place the external monitor at a comfortable viewing distance.
Therecommended distance is 510 mm–610 mm (20 in–24 in) from
your eyes.
• Ensure the monitor is at eye level or slightly lower when you are sitting
in front of the monitor.
• Adjust the tilt of the monitor, its contrast and brightness settings, andthe
lighting around you (such as overhead lights, desk lamps, and the
curtains or blinds on nearby windows) to minimize reflections and glare
on the monitor screen.
• Use a chair that provides good back support.
• Keep your forearms horizontal with your wrists in a neutral, comfortable
position while using the keyboard or mouse.
• Always leave space to rest your hands while using the keyboard or mouse.
• Let your upper arms hang naturally at your sides.
• Sit erect, with your feet resting on the floor and your thighs level.
• When sitting, ensure the weight of your legs is on your feet and not on
the front of your chair seat. Adjust your chair’s height or use a footrest,
ifnecessary, to maintain proper posture.
• Vary your work activities. Try to organize your work so that you do not
have to type for extended periods of time. When you stop typing, try to
do things that use both hands.
• Keep the area under the desk clear of obstruction and cables or power
cords that may interfere with comfortable seating or present a potential
trip hazard.