BEDRUNKA+HIRTH Main catalog industrial equipment Page 435
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ESD workplace systems ESD GLOSSARY A Bleeder resistance: Measurement between an earthing point and the electrodes on a surface. Antistatic: The "electrostatic charge reduction property", could be a special type of plastic, for example. Workstation The ESD-protected workstation should be ergonomically adaptable. Electrostatic charge is dissipated via the worktop and a earthing cable so that the workstation remains charge-neutral. M Dissipative: Surface resistance of materials between 105 and 1012 Ω. Markings Markings on the flooring indicate ESD protection areas. Signs and labels indicating potentially endangered components and assemblies are also important. Measurement technology Protective device must be metrologically tested regularly. When entering an EPA, measurements and regular personal inspections must be performed. Work benches, floor mats and earthing connections should be checked monthly and ESD monitoring instruments should be checked annually. The respective bleeder resistances should have the following values: Worktop: between 7.5 x 105 Ω and 109 Ω, Flooring: less than 109 Ω, Chair/standing aid: less than 1010 Ω, Tool: less than 1012Ω. E N D EPA: Electrostatic protected area, a work area where electrostatically sensitive components can be handled without damaging them. Earthing: Discharge of electric currents into the ground. Earthing point: Central point (e.g. on a worktop) that is connected to the building’s earthing. ESD: The phenomenon of electrostatic discharge. ESDS: Electrostatic discharge sensitive devices. F Flooring The flooring should be conductive and comply with the required limit values specified in DIN EN 61340-5-1. When cleaning ESD flooring, use only cleaning agents that do not form layers so that the conductivity values remain within the desired range. If only individual workstations are set up as EPAs, ESP floor mats or tiles can also be earthed. I IC: Integrated circuit, microchip, e.g. microprocessor. Ionisation: Removal of charged particles (e.g. electrons) from a material such as air. Ionisation devices can neutralise electrostatic charges by distributing ionised air. Isolator: Materials that have a high surface resistance of at least 1012 Ω. Static charges remain in a part of these materials for a long time without discharging (plastic, glass, air). L Storage/containers Conductive ESD shelving and containers for transporting and storing components protect endangered components. Assembly trolleys should be fitted with conductive wheels. Conductivity: Ability of a material to conduct electrical current, e.g. metals. Standards: IEC 61340-5-1 Protection of electronic devices from electrostatic phenomena - General requirements IEC 61340-5-2 Protection of electronic devices from electrostatic phenomena - User guide IEC 61340-4-1 Electrical resistance of floor coverings and installed floors ANSI/ESD S20.20.-1999 Protection of Electrical and Electronic Parts, Assemblies and Equipment ANSI/ESD S541-2003 Packaging materials for ESD sensitive items O Surface resistance: Resistance between two points on a surface, measured using a megohmmeter and two electrodes. P Personal grounding People are the main source of electrostatic charges. Shoes and a wrist strap with an earthing cable should be mandatory for employees in electronics production. Wrist strap and shoe testers facilitate the daily inspection of EPA effectiveness. The chair or standing aid should also have ESD protection. S Current: Unit [A] ampere, formula symbol: I, flow of (mostly negative) charge carriers. Voltage: Unit [V] volt, formula symbol: U, maintains the electrical current in a closed circuit and is thus the cause for the flow of current. W Resistance: Unit [Ω] Ohm, formula symbol: R, indicates what voltage is required to cause a particular current to flow through an electrical conductor. www.bedrunka-hirth.de 435
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