Compaq N800C manual Typical Electrostatic Voltage Levels, Relative Humidity Event 10% 40% 55%

Removal and Replacement Preliminaries

■Nonconductive plastic bags, tubes, or boxes

■Metal tote boxes

■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

✎A Product can be degraded by as little as 700 volts.

Maintenance and Service Guide 4–7