Compaq Armada E700 Armada E700 - Page 67
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 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 NOTE: 700 volts can degrade a product. 10% 35,000 V 12,000 V 6,000 V 2,000 V 11,500 V 14,500 V 26,500 V 21,000 V 40% 15,000 V 5,000 V 800 V 700 V 4,000 V 5,000 V 20,000 V 11,000 V 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 Bags Floor mats Floor mats Voltage Protection Level 1,500 V 7,500 V 15,000 V 4-6 Removal and Replacement Preliminaries