User Manual

56
A Appendix
Kensington
®
Locks
Kensington
®
locks (or compatible) allow the Notebook PC to be secured usually using a metal cable and
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include a motion detector to sound an alarm when moved.
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As lasers became more numerous and more widely used, the need to warn users of laser hazards became
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optically safe, requiring no controls (Class 1) to very hazardous, requiring strict controls (Class 4).
CLASS 1: A Class 1 laser or laser system emits levels of optical energy that are eye-safe and consequently
require no controls. An example of this class of laser system is the checkout scanning device found
in most grocery stores or lasers used in optical drives.
CLASS 2 & CLASS 3A: Class 2 and Class 3A lasers emit visible, continuous-wave (CW) optical ra-
diation levels slightly above the maximum permissible exposure (MPE) level. Although these lasers
can cause eye damage, their brightness usually causes observers to look away or blink before eye
damage occurs. These lasers have strict administrative controls requiring placement of signs warning
personnel not to stare directly into the beam. Class 3A lasers must not be viewed with optically-aided
devices.
CLASS 3B: Class 3B lasers, and Class 3A lasers with outputs of 2.5mW, are hazardous to personnel
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appropriate protective eyewear during any operation of the laser. Class 3B lasers have both administra-
tive and physical controls to protect personnel. Physical controls include limited access work areas.
Administrative controls include special warning signs posted outside the entrances to the laser work
spaces and lights outside the entrances that warn personnel when the lasers are in use.
CLASS 4: Class 4 lasers are high-power lasers that will cause damage to unprotected eyes and skin
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be in a room where a Class 4 laser is operating without proper eye protection.
PCI Bus (Peripheral Component Interconnect Local Bus)
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pansion card manufacturers.
POST (Power On Self Test)
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nostic tests. The POST checks system memory, the motherboard circuitry, the display, the keyboard, the
diskette drive, and other I/O devices.