HP Compaq NX7300 User Manual

4–8 Maintenance and Service Guide
Removal and Replacement Preliminaries
Table 4-1 shows how humidity affects the electrostatic voltage
levels generated by different activities.
Table 4-2 lists the shielding protection provided by antistatic
bags and floor mats.
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 V.
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 5,000 V

HP Compaq NX7300 Specifications

General

Graphics	Intel Graphics Media Accelerator 950
Operating System	Windows XP Professional
Wireless	802.11a/b/g
RAM	512 MB DDR2 SDRAM
Storage	80GB or 120GB HDD
Display	15.4 inch WXGA (1280x800)
Optical Drive	DVD-ROM
LAN	10/100/1000 Ethernet
Ports	3 x USB 2.0, VGA, RJ-11, RJ-45, headphone, microphone
Battery	6-cell Lithium-Ion
Weight	2.7 kg