Preventing Electrostatic Damage To Equipment; Personal Grounding Methods And Equipment; Grounding Workstations - Compaq Deskpro EX User Manual

3.1.2

Preventing Electrostatic Damage to Equipment

Many electronic components are sensitive to ESD. Circuitry design and structure
determine the degree of sensitivity. The following proper packaging and grounding
precautions are necessary to prevent damage to electric components and accessories.
!
To avoid hand contact, transport products in static-safe containers such as tubes,
bags, or boxes.
!
Protect all electrostatic parts and assemblies with conductive or approved
containers or packaging.
!
Keep electrostatic sensitive parts in their containers until they arrive at static-free
stations.
!
Place items on a grounded surface before removing them from their container.
!
Always be properly grounded when touching a sensitive component or assembly.
!
Avoid contact with pins, leads, or circuitry.
!
Place reusable electrostatic-sensitive parts from assemblies in protective packaging
or conductive foam.
3.1.3

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.
Static Shielding Protection Levels
Method
Antistatic plastic
Carbon-loaded plastic
Metallized laminate
3.1.4

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.
3-2 Removal & Replacement Preliminaries
Voltage
1,500
7,500
15,000