HP Xw4550 HP xw4550 Workstation - Service and Technical Reference Guide - Page 59

Preventing electrostatic damage to equipment, Personal grounding methods and equipment

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Table 4-1 Static electricity Event 55% Walking across carpet Walking across vinyl floor Motions of bench worker 7,500V 3,000V 400V Removing bubble pack from PCB 7,000V Packing PCBs in foam-lined box 5,000V NOTE: 700 volts can degrade a product. Relative humidity 40% 10% 15,000V 5,000V 800V 35,000V 12,000V 6,000V 20,000V 11,000V 26,500V 21,000V 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 Voltage Antistatic plastic Carbon-loaded plastic Metallized laminate 1,500 7,500 15,000 ENWW Service considerations 51

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Table 4-1
Static electricity
Relative humidity
Event
55%
40%
10%
Walking across carpet
Walking across vinyl floor
Motions of bench worker
7,500V
3,000V
400V
15,000V
5,000V
800V
35,000V
12,000V
6,000V
Removing bubble pack from PCB
Packing PCBs in foam-lined box
7,000V
5,000V
20,000V
11,000V
26,500V
21,000V
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
Voltage
Antistatic plastic
Carbon-loaded plastic
Metallized laminate
1,500
7,500
15,000
ENWW
Service considerations
51