HP Compaq nw8440, Maintenance And Service Manual

Page: 89 / 237

Removal and Replacement Preliminaries
Maintenance and Service Guide 4–7
4.7 Grounding Equipment and
Methods
Grounding equipment must include either a wrist strap or a
foot strap at a grounded workstation.
■
When seated, wear a wrist strap connected to a grounded
system. Wrist straps are flexible straps with a minimum of
one megohm ±10% resistance in the ground cords. To provide
proper ground, wear a strap snugly against the skin at all times.
On grounded mats with banana-plug connectors, use alligator
clips to connect a wrist strap.
■
When standing, use foot straps and a grounded floor mat.
Foot straps (heel, toe, or boot straps) can be used at standing
workstations and are compatible with most types of shoes
or boots. On conductive floors or dissipative floor mats, use
foot straps on both feet with a minimum of one megohm
resistance between the operator and ground. To be effective,
the conductive strips must be worn in contact with the skin.
Other grounding equipment recommended for use in preventing
electrostatic damage includes
■
Antistatic tape.
■
Antistatic smocks, aprons, and sleeve protectors.
■
Conductive bins and other assembly or soldering aids.
■
Nonconductive foam.
■
Conductive tabletop workstations with ground cords of
one megohm resistance.
■
Static-dissipative tables or floor mats with hard ties to
the ground.
■
Field service kits.
■
Static awareness labels.
■
Material-handling packages.
■
Nonconductive plastic bags, tubes, or boxes.
■
Metal tote boxes.
■
Electrostatic voltage levels and protective materials.