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Preventing Esd Equipment Damage; Personal Grounding Methods And Equipment - HP Z400 Maintenance And Service Manual

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Preventing ESD equipment damage

Many electronic components are sensitive to ESD. Circuitry design and structure determine the degree
of sensitivity. The following packaging and grounding precautions are necessary to prevent damage to
electric components and accessories:
Transport products in static-safe containers such as tubes, bags, or boxes, to avoid hand contact.
Protect electrostatic parts and assemblies with nonconductive 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 containers.
When handling or touching a sensitive component or assembly, ground yourself by touching the
chassis.
Avoid contact with pins, leads, or circuitry.
Place reusable electrostatic-sensitive parts from assemblies in protective packaging or
nonconductive foam.

Personal grounding methods and equipment

Use the following items to help prevent ESD damage:
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
workstation.
Heel straps, toe straps, and boot straps—These 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 maximum of one megohm ± 10% resistance between the operator
and ground.
The following table shows protection levels available from static shielding materials.
Table 5-1
Static shielding
protection levels
Method
Antistatic plastic
Carbon-loaded plastic
Metallized laminate
This section provides guidelines to prevent ESD damage to equipment.
ENWW
Voltage
1,500V
7,500V
15,000V
Service considerations
67

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