Copy of `Vermason - ESD Protection terms`

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Vermason - ESD Protection terms
Category: Electronics and Engineering > Electrostatic discharge
Date & country: 30/11/2007, UK
Words: 16


Antistatic
Many materials hold an electrostatic charge after rubbing or separation from another material. Antistatic materials do not, or only very slightly, generate a charge (see low-charging). Astatic: A synonym for 'antistatic' (see low-charging).

Earth grounding point
A connector such as a stud, usually fixed to a bench mat or wristband, to which a grounding cord can be fixed. Also known as a groundable point.

Electrostatic conductive
Resistance (Rs, Rv or RG) of less than 105 ohm but greater than 103 ohm, usually measured with a DC voltage of 10 volt.

Electrostatic discharge
A sudden transfer of electrostatic charge between bodies at different electrostatic potential, usually as a spark as the bodies approach one another.

Electrostatic dissipative
Resistance greater than 105 but less than 1012 ohm, usually measured with a DC voltage of 100 volt.

EPA earth bonding point
A grounded fixture to which EPA equipment may be connected or 'bonded', usually via a grounding wire or cord.

EPA ground facility
A fixture, connected to ground or to the earth of the electrical mains, or to the steel frame of a building, to which are run one or more earth bonding points.

ESD protected area
An area, small or large, such as a work station or a factory, designed to allow handling of ESD sensitive devices with a defined level of risk of damage by ESD.

Ground
A large conducting body, such as the earth or the steel frame of a building or the hull of a ship, used as a return path for electric currents and as an arbitrary zero reference point.

Insulative
Resistance greater than 1012 ohm.

Low-charging
Material which does not charge when rubbed with, or seperated from other materials. Note: The terms astatic and antistatic have previously been used to describe this property definition.

Ohm
Unit of electrical resistance.

Ohm per square
An obsolete unit of surface resistivity of thin, single - layer materials. It was determined using a square probe that is no longer part of the new ESD standard in use in Europe.

Static decay time
Time needed for a charge with a given potential e.g. of 1000 volt to be reduced to, usually, 10% of its initial potential. Used to better characterise materials of high resistance, usually above 109 ohm (1010 in IEC 61340-5-1).

Surface resistance
The resistance, usually expressed in ohm, measured between two electrodes (of defined size, weight and hardness) placed apart on the same side of a planar material (such as a bench mat or a packaging film). The standard or the test method should be noted.

Volume resistance
The resistance, usually expressed in ohm, measured between two electrodes (of defined size, weight and hardness) placed on opposite sides of a planar material (such as a bench mat or a packaging film). The thickness of the material and the test method should be noted.