A Halle's Service, Inc.
Phoenix, Arizona
est. 1964
 

Lightning

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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.

 

Last modified: March 31, 2007