13
floor in ordinary walking. This charge is transferred to the electronic
circuits when they are touched.
Any damage that occurs to the electronics may be difficult to detect
and trace. It varies from immediate destruction of a circuit so that it no
longer works at all to insidiously affecting operation so that perfor-
mance is not maintained. The circuits may even appear to be undam-
aged and then later disintegrate inexplicably.
Most replacements of electronic boards where the fault cannot be
explained and is blamed on uneven quality are probably due to ESD
damage.
Requirements for protection in installation and servicing
GETINGE has ESD protection integrated into the production and test-
ing of electronic equipment and also requires ESD protection to be used
after delivery for the warranty to apply.
Damage usually occurs after delivery if electronic boards are stored in
non-ESD-approved packs, if electronic boards are placed on non-ESD-
protected work surfaces or if people not wearing ESD protection touch
them. Simple equipment can be obtained for all these situations which
prevents charging and therefore ESD damage. Contact your local dis-
tributor of ESD protective equipment or GETINGE After Sales.
Practical requirements
•
Keep electronic boards only in screened and ESD-approved
(marked) bags.
• Use ESD pads connected to earth in accordance with the manufac-
turer's instructions to hold disassembled or new electronic boards
during assembly work.
• Do not touch electronic boards with tools that may be charged, e.g.
screwdrivers with a plastic or wooden handle. Use earthed tools if
necessary.
• Always use an ESD wrist band connected to earth in accordance with
the manufacturer's instructions when working in the electronic
enclosure or when handling boards.
• Newer keep foreign objects such as drawings or plastic pockets
inside the electronic box.
• Test the ESD protective equipment regularly.
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