Chapter 11/ understanding Operational Procedures Flashcards
what is Electrostatic Discharge
508
Electrostatic Discharge, ESD happen when two objects of dissimilar charge come in contact with each other, they exchange electrons in order to standardized the electrostatic charge between them , this charge can damage electronic components in the computer
as little as 100 volts or less can create a problem damage that very sensitive electronic equipment.
ESD preventions
509
ESD wrist straps ESD Antistatic Mats Antistatic bag for parts self grounding maintain the relative humidity at around 50% antistatic spray
Electromagnetic Interference, EMI
513
Electromagnetic Interference, EMI is a disturbance that occurs when two or more magnetic fields interact with one another. These fields can cause problems in any electric device with a circuit board. some of the common sources of interfaces are
Network devices the wireless 802.11 a/b/g
Magnets
cordless
microwave ovens
personal safety
518
some techniques to ensure a personal safety are unplugged the computer from the power securely the power cord remove any jewelry and secure long hair and neckties lift with your legs do not twist when lifting keep object close to your body push rather than pull use cable ties floor cable ground
*Electrical fire safety
523 A, B, C, D the most popular is ABC
fire extinguishers in case of fire we do not use water or foam Instead, we use something that is a dry chemical or perhaps even CO2 or FM-200.
remove the power source. You may not be able to get near the fire and physically unplug devices, so you need to be sure you know where the electrical panels are or where a master power off switch might be.
OSHA
520
Short for Occupational Safety and Health Administration, OSHA is a federal agency that sets and enforces standards for workplace safety.
are blackout and brownout the same
524
power outage, a blackout is a term used to describe any situation when there is no power. When a blackout occurs the home, office, or school has no power, which causes any computer or other device without a battery or generator backup to stop working.
UPS
524
Uninterruptible Power Supply
UPS is a hardware device that provides a backup power source in case of a power outage (blackout), brownout, or a surge in power.
what is surge
525
line surge or power surge, a surge is a short, fast rise in voltage that inherently causes an increase in electrical current or vice versa. Exclusive to electrical circuits, a power surge can cause damage or impairment to a computer or other devices.
for that we use surge protector
*SPS
Standby Power Supply, an SPS contains a circuit that is capable of telling if and when a disturbance in electricity occurs. When a disturbance occurs, the SPS switches to battery power, however, if the SPS switch time is not fast enough, all power may still be lost. Higher quality SPS systems offer a offers a small amount of power while switching takes place.
how can we have protection from airborne particles
527
enclosure: can be used to describe any external or internal box that holds a computer peripheral such as a hard drive.
Air filters.
cleaning system
527
we need to keep computer clean from dust, dirt and oils by using the right cleaning compounds
Compressed air
527
Compressed air is a combination of under pressure gases that are squeezed into a can. With computers and electronics, compressed air is the preferred method for removing dust and dirt from sensitive electronics.
vacuum
527
an other way of cleaning
MSDS, Material Safety Data Sheet
529
is an other place to fined safety information, it is a document with information about disposing, handling, precautions, storage, and accident procedures.
