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Personal
grounding
methods and
equipment
Use the following items to help prevent ESD damage:
●
Wrist straps — These are flexible straps with a maximum of one megohm ± 10% resistance
in the ground cords. To provide a proper ground, wear the strap against bare skin. The
ground cord must be connected and fit snugly into the banana plug connector on the
grounding mat or computer.
●
Heel straps, toe straps, and boot straps — These can be used at standing computers
and are compatible with most types of shoes or boots. On conductive floors or dissipative
floor mats, use them on both feet with a maximum of one megohm ± 10% resistance between
the operator and ground.
Static shielding
materials
Static shielding materials provide the following levels of protection.
Method
Antistatic plastic
Carbon-loaded plastic
Metalized laminate
Voltage
1,500V
7,500V
15,000V
Grounding the
work area to
prevent static
damage
●
Cover the work surface with approved
static-dissipative material. Use a wrist
strap connected to the work surface, and
properly grounded tools and equipment.
●
Use static-dissipative mats, foot straps, or
air ionizers to give added protection.
●
Handle electrostatic-sensitive
components, parts, and assemblies by
the case or PCB laminate. Handle them
only in static-free work areas.
●
Disconnect power and input signals before
inserting and removing connectors or test
equipment.
●
Use fixtures made of static-safe materials
when fixtures must directly contact
dissipative surfaces.
●
Keep work area free of nonconductive
materials, such as plastic assembly aids and
Styrofoam.
●
Use field service tools (such as cutters,
screwdrivers, and vacuums) that are
conductive.
Recommended
ESD prevention
materials and
equipment
●
Antistatic tape
●
Antistatic smocks, aprons, and sleeve
protectors
●
Conductive bins and other assembly or
soldering aids
●
Conductive foam
●
Conductive tabletop computers with a
ground cord of one megohm ± 10%
resistance
●
Static-dissipative table or floor mats with
a hard-tie to ground
●
Field service kits
●
Static awareness labels
●
Wrist straps and footwear straps providing
one megohm ± 10% resistance
●
Material-handling packages
●
Conductive plastic bags
●
Conductive plastic tubes
●
Conductive tote boxes
●
Opaque shielding bags
●
Tran
sparent metallized shielding bags
●
Transparent shielding tubes
80 Chapter 3 Component Replacement Information and Guidelines