WebEML User Manual Safety awareness
57
Workers are supplied with anti-static protection devices consisting of an elasticized
band worn around the wrist and a coiled cord connected to the elasticized band and
to the stud on the subrack. See Figure 13.
1.6 Cautions to avoid equipment damage
1.6.1 Electrostatic-sensitivity
An Electrostatic-Sensitive Device (ESD) can withstand voltage spikes of only 10 to
100 volts and can be damaged or effectively destroyed by a discharge that might go
unnoticed by a technician. Some devices have built-in protection. However, because
this protection is effective only against the lower levels of electrostatic charges, a
false sense of security often prevails.
Common plastics (synthetic insulating materials), clothing, and paper or cardboard
are the most common sources of static charges.
Observe special precautions when the ESD sign is displayed. See Figure 12.
Figure 12 Electrostatic-sensitive sign
The following items are examples of ESDs:
• MOS (Metal Oxide Semiconductor) capacitors, transistors, Integrated Circuits
(ICs)
• CMOS (Complementary Metal Oxide Semiconductor) transistors, ICs
• JFET (Junction Field Effect Transistors)
• IGFET (Insulated Gate Field Effect Transistors)
Warning: Common plastic, white foam, cellophane, and masking adhesive tapes must not
come in contact with ESDs or their packaging.
Release 7.0.0 3DB 19286 ACAA Issue 01
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