Preventing Electrostatic Damage To Equipment; Personal Grounding Methods And Equipment - HP Xw4550 - Workstation - 2 GB RAM Technical Reference Manual
Hp xw4550 workstation - service and technical reference guide
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- Service and technical reference manual (158 pages) ,
- Quickspecs (65 pages) ,
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Table 4-1
Static electricity
Walking across carpet
Walking across vinyl floor
Motions of bench worker
Removing bubble pack from PCB
Packing PCBs in foam-lined box
NOTE: 700 volts can degrade a product.
Preventing electrostatic damage to equipment
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 all electrostatic parts and assemblies with approved non-conductive 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 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 non-
conductive foam.
Personal grounding methods and equipment
Use the following equipment to prevent static electricity damage to equipment:
●
Wrist straps 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 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.
Table 4-2
Static shielding protection levels
Method
Antistatic plastic
Carbon-loaded plastic
Metallized laminate
ENWW
Event
7,500V
3,000V
400V
7,000V
5,000V
Relative humidity
55%
40%
15,000V
5,000V
800V
20,000V
11,000V
Voltage
1,500
7,500
15,000
10%
35,000V
12,000V
6,000V
26,500V
21,000V
Service considerations
51
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Troubleshooting
