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SW 9.xx
8.1
ESD/EMC Information
8.1.1
Electrostatic Discharge ESD
Prevent a direct contact of body parts with ground potential!
Electrical shock hazard - do not touch any live components!
ESD
Electrostatic discharge ESD is a static energy, which causes a sudden flow of
electricity between two objects at different electrical potentials. ESD is the
primary cause for damage or failure of integrated circuits.
The following information should help service technicians to prevent static
discharge during servicing.
ESD Protection
Precautions must be made when working on internal components of a system
to prevent accidental static discharges to the components.
At any time the human body can hold a large static voltage charge that can
easily damage components in a system. If this charge suddenly flows from one
device to another through logic circuits these components can be damaged.
ESD Service Workstations
Service workstations should be adequately equipped with ESD devices to
establish an area which meets static charge requirements to prevent damage
of electronic components on pcb's.
Each service workstation should have a work surface with a conductive/
dissipative material. The work surface and soldering iron should be connected
to ground potential via protective resistors.
Personnel should wear a conducting wristband connected to the work surface,
via a protective resistor cable. If possible personnel should wear cotton
clothing to prevent static charging. Shoes should also be antistatic.
If applicable chairs, floors and mats in this area should be antistatic.
ESD Service Ket
Fig. : ESD Service Kit
Use ESD service kits to equalize charges between you and any of the system
components. Portable service kits are designed to prevent static charge of
electronic systems during field service.
In general these service kits contain a wrist band and mat, with ground
bonding cable for attachment to the system frame or an earth bonding point
mains plug.
Fig. : Mains Plugs with Earth Bonding Point
Mat Material
In general the mats are made of sturdy two layer material and have reinforced
edges and corners. The work surface is static dissipative (> 100 M
Ω
), the
other side is conductive (> 100 k
Ω
).
