Compaq Armada m300 Compaq Armada M300 Series of Personal Computers Maintenance - Page 59

Electrostatic Voltage Levels and Protective Materials, Table 4-1, Typical Electrostatic Voltage Levels

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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. Table 4-1 Typical Electrostatic Voltage Levels Relative Humidity Event 10% 40% 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 PCB Packing PCBs in foam-lined box 35,000 V 12,000 V 6,000 V 2,000 V 11,500 V 14,500 V 26,500 V 21,000 V 15,000 V 5,000 V 800 V 700 V 4,000 V 5,000 V 20,000 V 11,000 V NOTE: 700 volts can degrade a product. 55% 7,500 V 3,000 V 400 V 400 V 2,000 V 3,500 V 7,000 V 5,000 V Table 4-2 lists the shielding protection provided by antistatic bags and floor mats. Material Antistatic plastic Carbon-loaded plastic Metallized laminate Table 4-2 Static-Shielding Materials Use Voltage Protection Level Bags 1,500 V Floor mats 7,500 V Floor mats 15,000 V 4-6 Removal and Replacement Preliminaries

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4-6
Removal and Replacement Preliminaries
Electrostatic Voltage Levels and Protective Materials
Table 4-1 shows how humidity affects the electrostatic voltage levels generated by
different activities.
Table 4-1
Typical Electrostatic Voltage Levels
Relative Humidity
Event
10%
40%
55%
Walking across carpet
35,000 V
15,000 V
7,500 V
Walking across vinyl floor
12,000 V
5,000 V
3,000 V
Motions of bench worker
6,000 V
800 V
400 V
Removing DIPS from plastic tube
2,000 V
700 V
400 V
Removing DIPS from vinyl tray
11,500 V
4,000 V
2,000 V
Removing DIPS from Styrofoam
14,500 V
5,000 V
3,500 V
Removing bubble pack from PCB
26,500 V
20,000 V
7,000 V
Packing PCBs in foam-lined box
21,000 V
11,000 V
5,000 V
NOTE:
700 volts can degrade a product.
Table 4-2 lists the shielding protection provided by antistatic bags and floor mats.
Table 4-2
Static-Shielding Materials
Material
Use
Voltage Protection Level
Antistatic plastic
Bags
1,500 V
Carbon-loaded plastic
Floor mats
7,500 V
Metallized laminate
Floor mats
15,000 V