HP Z440 Workstation Series Maintenance And Service Manual page 57

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Personal grounding Use the following items to help prevent ESD damage:
methods and
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equipment
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Static shielding Static shielding materials provide the following levels of protection.
materials
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Grounding the work
area to prevent static
damage
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Recommended ESD
prevention materials
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and equipment
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Avoid contact with pins, leads, or circuitry.
Place reusable electrostatic-sensitive parts from assemblies in protective packaging or
nonconductive foam.
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.
Method
Antistatic plastic
Carbon-loaded plastic
Metalized laminate
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.
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
Voltage
1,500V
7,500V
15,000V
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Disconnect power and input signals before
inserting and removing connectors or test
equipment.
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Use fixtures made of static-safe materials
when fixtures must directly contact dissipative
surfaces.
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Keep work area free of nonconductive
materials, such as plastic assembly aids and
Styrofoam.
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Use field service tools (such as cutters,
screwdrivers, and vacuums) that are
conductive.
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Static awareness labels
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Wrist straps and footwear straps providing one
megohm ± 10% resistance
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Material-handling packages
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Conductive plastic bags
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Conductive plastic tubes
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Conductive tote boxes
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Opaque shielding bags
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Transparent metallized shielding bags
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Transparent shielding tubes
Service considerations 47