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ESD Guidelines
Handling ESD as-
A general rule is that assemblies should be touched only when this cannot be
semblies
avoided owing to the work that has to performed on them. Under no circum-
stances should you handle printed-circuit boards by touching device pins or
circuitry.
You should touch devices only if
Before you touch an electronic assembly, your body must be discharged. The
simplest way of doing this is to touch a conductive, grounded object immedi-
ately beforehand – for example, bare metal parts of a cabinet, water pipe etc.
Assemblies should not be brought into contact with charge-susceptible and
highly insulating materials such as plastic films, insulating table tops and items
of clothing etc. containing synthetic fibers.
Assemblies should be deposited only on conductive surfaces (tables with an
ESD coating, conductive ESD cellular material, ESD bags, ESD shipping con-
tainers).
Do not place assemblies near visual display units, monitors or television sets
(minimum distance to screen > 10 cm).
Measuring and
Perform measurements on ESD assemblies only when
modifying ESD as-
semblies
When soldering, use only grounded soldering irons.
Shipping ESD as-
Always store and ship assemblies and devices in conductive packing – for ex-
semblies
ample, metallized plastic boxes and tin cans.
If packing is not conductive, assemblies must be conductively wrapped before
they are packed. You can use, for example, conductive foam rubber, ESD bags,
domestic aluminum foil or paper (never use plastic bags or foils).
With assemblies containing fitted batteries, make sure that the conductive
packing does not come into contact with or short-circuit battery connectors. If
necessary, cover the connectors beforehand with insulating tape or insulating
material.
E-2
you are grounded by permanently wearing an ESD wrist strap or
you are wearing ESD shoes or ESD shoe-grounding protection straps in
conjunction with an ESD floor.
the measuring instrument is grounded – for example, by means of a protec-
tive conductor – or
the measuring head has been briefly discharged before measurements are
made with a potential-free measuring instrument – for example, by touch-
ing a bare metal control cabinet.
TP27, TP37 Equipment Manual
Release 01/00
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