Personal Grounding Methods And Equipment; Grounding Workstations - Compaq Deskpro EN Series Maintenance & Service Manual

4.1.3

Personal Grounding Methods and Equipment

Use the following equipment to prevent static electricity damage to equipment:
Wrist straps are flexible straps with a minimum of one-megohm +/- 10% resistance in the ground
cords. To provide proper ground, a strap must be worn snug against bare skin. The ground cord
must be connected and fit snugly into the banana plug connector on the grounding mat or
workstation.
Heel straps/Toe straps/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 them on both feet
with a minimum of one-megohm +/- 10% resistance between the operator and ground.
Method
Antistatic plastic
Carbon-loaded plastic
Metallized laminate
4.1.4

Grounding Workstations

To prevent static damage at the workstation, use the following precautions:
„
Cover the workstation with approved static-dissipative material. Provide 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 at static-free workstations.
„
Turn off 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 ordinary plastic assembly aids and
Styrofoam.
„
Use field service tools, such as cutters, screwdrivers, and vacuums, that are conductive.
Table 4-2
Static Shielding Protection Levels
Voltage
1,500
7,500
15,000
Compaq Deskpro EN Series of Personal Computers 4-3