Equipment Guidelines - HP 520 Maintenance And Service Manual

Handle ESD-sensitive components, parts, and assemblies by the case or PCM laminate. Handle these
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items only at static-free workstations.
Avoid contact with pins, leads, or circuitry.
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Turn off power and input signals before inserting or removing connectors or test equipment.
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Equipment guidelines

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
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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
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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.
The following grounding equipment is recommended to prevent electrostatic damage:
Antistatic tape
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Antistatic smocks, aprons, and sleeve protectors
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Conductive bins and other assembly or soldering aids
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Nonconductive foam
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Conductive tabletop workstations with ground cords of one megohm resistance
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Static-dissipative tables or floor mats with hard ties to the ground
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Field service kits
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Static awareness labels
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Material-handling packages
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Nonconductive plastic bags, tubes, or boxes
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Metal tote boxes
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Electrostatic voltage levels and protective materials
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The following table lists the shielding protection provided by antistatic bags and floor mats.
Material
Antistatic plastic
Carbon-loaded plastic
Metallized laminate
28 Chapter 4 Removal and replacement procedures
Use
Bags
Floor mats
Floor mats
Voltage protection level
1,500 V
7,500 V
5,000 V