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Static electricity is generated when certain
materials are rubbed together, such as walking across a carpeted floor, sliding
onto a couch or chair, or even handling a plastic bag. Electrostatic discharge
(ESD) occurs when a charged material, such as our hand comes close to or
touches another material with an unlike charge, such as a TV, VCR, Camcorder
or other electronic device.
In the past few years, significant advances have
been made in semiconductor technology. The trend has been toward higher speed,
higher density, and less power consumption. As a result of this trend, these
devices have become much more vulnerable to ESD. In fact - many of them can be damaged
by as little as 30 volts!!
Most humans cannot feel an ESD until it reaches a
level of about 3000 volts. By studying the following chart, one can see that ESD
is a problem that must be dealt with.
MEANS OF STATIC GENERATION |
ELECTROSTATIC VOLTAGES @ 10% -
20% RELATIVE HUMIDITY |
ELECTROSTATIC VOLTAGES @ 65% -
90% RELATIVE HUMIDITY |
Walking across carpet |
35,000 |
1,500 |
Walking over vinyl floor |
12,000 |
250 |
Picking up poly bag |
20,000 |
1,200 |
Sitting on padded chair |
18,000 |
1,500 |
There are a number of anti-static measures that may be taken
including grounding straps, anti-static mats, ionized air generators,
humidifiers, and chemical treatments. The worst source of static in the home is
usually the carpeting, so treating it with a commercially available
preparation or a dilute solution of liquid fabric softener will usually
control the problem. You will need to repeat the treatment as often as static
returns to insure safe operation of your equipment. In addition there are
measures you should take to protect your equipment from lightning
damage.
Courtesy, Halle's
Service, Inc.
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