Specifications

Removal and Replacement Preliminaries
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COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Writer: David Calvert Saved by: J Abercrombie Saved date: 06/22/00 3:36 PM
Part Number: 128679-004 File name: Ch04
4.7 Grounding Equipment and Methods
Grounding equipment must include either a wrist strap or a foot strap at
a grounded workstation.
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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 snug against the skin at all times. On grounded mats
with banana-plug connectors, connect a wrist strap with alligator
clips.
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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 them 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.
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Other grounding equipment recommended for use in preventing
electrostatic damage include:
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Antistatic tape
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Antistatic smocks, aprons, or sleeve protectors
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Conductive bins and other assembly or soldering aids
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Non-conductive foam
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Conductive tabletop workstations with ground cord of one-megohm
resistance
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Static-dissipative table or floor mats with hard tie to 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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Non-conductive plastic bags, tubes, or boxes
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Metal tote boxes
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Electrostatic Voltage Levels and Protective Materials
Table 4-1 shows how humidity affects the electrostatic voltage levels
generated by different activities.