Typical Electrostatic Voltage Levels - HP Compaq nx5000 series Maintenance And Service Manual

Table 4-1 shows how humidity affects the electrostatic voltage
levels generated by different activities.
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
✎
A product can be degraded by as little as 700 volts.
Table 4-2 lists the shielding protection provided by antistatic bags
and floor mats.
Material
Antistatic plastic
Carbon-loaded plastic
Metallized laminate

Typical Electrostatic Voltage Levels

Static-Shielding Materials
Use
Bags
Floor mats
Floor mats
Table 4-1
Relative Humidity
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
Table 4-2
Voltage Protection Level
1,500 V
7,500 V
5,000 V
40% 55%
15,000 V 7,500 V
5,000 V 3,000 V
800 V 400 V
700 V 400 V
4,000 V 2,000 V
5,000 V 3,500 V
20,000 V 7,000 V
11,000 V 5,000 V