7 x Antistatic Wrist Strap
PLEASE NOTE: THIS IS A BULK CLEARANCE SALE!!!! EVERYTHING MUST GO!!! THIS AUCTION IS FOR 7 UNITS . WINNER WILL RECEIVE ALL 7!!! ALL IN ORIGINAL PACKAGING!!!
payment must be made with 3 days after auction closes!!!
SHIPPING FOR CLEARANCE SALE:
R55 PER AUCTION!! (Ordinary counter to counter)
R100 PER AUCTION!!! (Speed service counter to counter)
PRICE IS NOT FOR PER UNIT BUT FOR ALL 7 UNITS!!!
Understanding ESD
What is ESD?
The human body can build up static charges of up to 25000 volts. These can discharge into a body or device that has lower charge. This surge of electricity can damage electronic devices.
Why is a 25kV discharge not fatal?
The 25kV associated with video monitors can be deadly; whereas the 10 25kV associated with ESD is not harmful to humans. The reason is the difference in current-delivering capabilities created by the voltage:
A video monitor gets its power from a constant power supply. Current is continually supplied, pushed at a constant voltage.
In a static discharge, a build-up of electrical charge creates the high voltage. When the discharge occurs, the charges move (current flows) through the conductor (a human or a PC circuit board). However, as the built-up charges dissipate the pushing voltage drops and the current also drops. Within microseconds the current will cease to be at dangerous levels.
A mains powered device (such as a 230V ac power supply) is much more dangerous than a 25kV static discharge.
When people move, their clothes rub together and can produce large amounts of electrostatic charge on their bodies. Walking across carpeting can create charges in excess of 1,000 volts. Motors in electrical devices, such as vacuum cleaners and refrigerators, also generate high levels of ESD. Note, however, that compressed air does not usually create ESD problems.
ESD is most likely to occur during periods of low humidity. ESD generally does not occur when the humidity is above 50%. Normal air-conditioning removes moisture from the atmosphere and can increase the potential for ESD.
Risk to circuitry
ESD poses a risk to some electronic circuitry, where even a micro-amp current discharge can damage miniature transistors.
Metal oxide semiconductor (MOS) devices (used in CMOS digital circuitry throughout a PC) are sensitive to voltage spikes and ESD. Simply touching a CMOS device could destroy it.
Note: The "CMOS memory" on a motherboard was named at a time when that IC was the only one made from CMOS circuitry; nowadays, most ICs inside a PC are built using CMOS technology
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