Preliminary replacement requirements 29 – HP 15 User Manual

Page 37

The following table shows how humidity affects the electrostatic voltage levels generated by

different activities.

CAUTION:

A product can be degraded by as little as 700 V.

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

Preliminary replacement requirements