Grounding Equipment And Methods - Compaq Evo N150 Maintenance And Service Manual

Removal and Replacement Preliminaries

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 megaohm ±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,
connect a wrist strap with alligator clips.
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-megaohm
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


Non-conductive foam


Conductive tabletop workstations with ground cords of


one-megaohm resistance
Static-dissipative table or floor mats with hard tie to ground


Field service kits


Static awareness labels


Material-handling packages


4–6 Maintenance and Service Guide