General
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3.10 Handling circuit boards
Circuit boards with control electronics are sensitive to discharges of
static electricity (ESD – ElectroStatic Discharge) when handled. To
prevent damaging the components, special care is therefore required
when handled.
Fig. 3 Bracelet
Damage is usually latent, and a circuit board can operate impeccably
during commissioning but show signs of problems later. Charged
objects may only be problematic if they are in close proximity to the
electronics. Keep a distance of at least one metre from expanded
polystyrene, protective plastic and other packaging, synthetic material
(e.g. fleeces) and similar before starting work.
A condition for good ESD protection is a ground-connected bracelet
when handling electronics. This bracelet must be put on before opening
the screened metal bag/packaging or before exposing an installed
board. The bracelet must be worn until the circuit board is enclosed in its
screen packaging or closed electric box. Replaced, returned circuit
boards must be handled in the same way.
Fig. 4
CAUTION:
Never grasp a circuit board without wearing a
ground-connected bracelet.
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