Dell Latitude C840 User Guide - Page 12

Appendix Ergonomic Computing Habits Regulatory Notices Warranty and Return Policy Ergonomic Computing Habits CAUTION: Improper or prolonged keyboard use may result in injury. CAUTION: Viewing the display or external monitor screen for extended periods of time may result in eye strain. For comfort and efficiency, observe the following ergonomic guidelines when setting up and using your computer workstation: l Position your computer directly in front of you as you work. l Adjust the tilt of the computer's display, its contrast and/or 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 display. l When using an external monitor with your computer, set the monitor at a comfortable viewing distance (usually 450 to 610 millimeters [18 to 24 inches] from your eyes). Make sure the monitor screen is at eye level or slightly lower when you are sitting in front of the monitor. l Use a chair that provides good lower-back support. l Keep your forearms horizontal with your wrists in a neutral, comfortable position while using the keyboard, touch pad, track stick, or external mouse. l Always use the palm rest with the keyboard, touch pad, or track stick. Leave space to rest your hands when using an external mouse. l Let your upper arms hang naturally at your sides. l Ensure that your feet are resting flat on the floor. l When sitting, make sure 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. l 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. For more information about ergonomic computing habits, see the BSR/HFES 100 standard, which can be purchased on the Human Factors and Ergonomics Society (HFES) website at: www.hfes.org/publications/HFES100.html References: 1. American National Standards Institute. ANSI/HFES 100: American National Standards for Human Factors Engineering of Visual Display Terminal Workstations. Santa Monica, CA: Human Factors Society, Inc., 1988. 2. Human Factors and Ergonomics Society. BSR/HFES 100 Draft standard for trial use: Human Factors Engineering of Computer Workstations. Santa Monica, CA: Human Factors and Ergonomics Society, 2002. 3. International Organization for Standardization (ISO). ISO 9241 Ergonomics requirements for office work with visual display terminals (VDTs). Geneva, Switzerland: International Organization for Standardization, 1992. Regulatory Notices Electromagnetic Interference (EMI) is any signal or emission, radiated in free space or conducted along power or signal leads, that endangers the functioning of a radio navigation or other safety service or seriously degrades, obstructs, or repeatedly interrupts a licensed radio communications service. Radio communications services include but are not limited to AM/FM commercial broadcast, television, cellular services, radar, air-traffic control, pager, and Personal Communication Services (PCS). These licensed services, along with unintentional radiators such as digital devices, including computers, contribute to the electromagnetic environment.