Dell Precision WorkStation 210 User Manual

Also see for Precision WorkStation 210: Quick reference guide User guide

Contents

D-6 Dell Precision 210 Desktop Systems User’s Guide&RUURVLRQThe oil from a person’s fingers or prolonged exposure to high temperature or humiditycan corrode the gold-plated edge connectors and pin connectors on various devices inthe system. This corrosion on system connectors is a gradual process that can even-tually lead to intermittent failures of electrical circuits.To prevent corrosion, you should avoid touching contacts on boards and cards. Pro-tecting the system from corrosive elements is especially important in moist and saltyenvironments, which tend to promote corrosion. Also, as a further deterrent to corro-sion, the system should not be used in extreme temperatures, as explained in“Temperature” found earlier in this appendix.(6'ESD results from the buildup of static electricity on the human body and certain otherobjects. This static electricity is often produced by simple movements such as walk-ing across a carpet. ESD is a discharge of a static electrical charge that occurs when aperson whose body contains such a charge touches a component in the system. Thisstatic discharge can cause components, especially chips, to fail. ESD is a problem par-ticularly in dry environments where the relative humidity is below 50 percent. Toreduce the effects of ESD, you should observe the following guidelines:á When working inside the system, wear a wrist-grounding strap. If a wrist-grounding strap is unavailable, touch an unpainted metal surface on the chassisperiodically to neutralize any static charge.á If at all possible, stand on a concrete floor while working inside the system.á Use an antistatic floor mat when working inside the system.á If it is necessary to work in a carpeted area, spray the carpet with an antistaticspray and allow it to dry before beginning to work inside the system.á Keep components in their antistatic packaging until they are installed.á Avoid wearing clothing made of wool or synthetic materials.(OHFWURPDJQHWLFDQG5DGLR)UHTXHQF\,QWHUIHUHQFHElectromagnetic interference (EMI) and radio frequency interference (RFI) from a sys-tem can adversely affect devices such as radio and television (TV) receivers operatingnear the system. Radio frequencies emanating from a system can also interfere withcordless and low-power telephones. Conversely, RFI from high-power telephones cancause spurious characters to appear on the system’s monitor screen.RFI is defined as any EMI with a frequency above 10 kilohertz (kHz). This type of inter-ference can travel from the system to other devices through the power cable andpower source or through the air like transmitted radio waves. The Federal Communi-cations Commission (FCC) publishes specific regulations to limit the amount of EMIand RFI emitted by computing equipment. Each Dell system meets these FCCregulations.