Grounding Equipment And Methods - NETGEAR MP115 User Manual

• Turn off power and input signals before inserting or removing connectors, or test equipment.

Grounding Equipment and Methods

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 with a
minimum of 1 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, connect a wrist
strap with alligator clips.
• 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 foot straps on both feet with a minimum of 1 megohm resistance
between the operator and ground. To be effective, the conductive strips must be worn in contact with the
skin.
Other grounding equipment recommended for use in preventing electrostatic damage includes:
• Antistatic tape
• Antistatic smocks, aprons, and sleeve protectors
• Conductive bins and other assembly or soldering aids
• Nonconductive foam
• Conductive tabletop workstations with ground cords of 1 megohm resistance
• Static-dissipative tables or floor mats with hard ties to the ground
• Field service kits
• Static awareness labels
• Material-handling packages
• Nonconductive plastic bags, tubes, or boxes
• Metal tote boxes
• Electrostatic voltage levels and protective materials
Table below shows how humidity affects the electrostatic voltage levels generated by different activities:
Walking across carpet
Walking across vinyl floor
Motions of bench worker
Removing DIPS from plastic tube
Removing DIPS from vinyl tray
Removing DIPS from Styrofoam
Removing bubble pack from PWB
Packing PWBs in foam-lined box
Note: A product can be degraded by as little as 700 volts
Table below lists the shielding protection provided by antistatic bags and floor mats.
Antistatic plastic
Carbon-loaded plastic
Metallized laminate
2BDF0-020017 REV.00
Typical Electrostatic Voltage Levels
Event
Static-Shielding Materials
Material
Relative Humidity
10% 40%
35,000 V 15,000 V
12,000 V 5,000 V
6,000 V 800 V
2,000 V 700 V
11,500 V 4,000 V
14,500 V 5,000 V
26,500 V 20,000V
21,000 V 11,000 V
Use Voltage Protection Level
Bags
Floor mats
Floor mats
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55%
7,500 V
3,000 V
400 V
400 V
2,000 V
3,500 V
7,000 V
5,000 V
1,500 V
7,500 V
5,000 V