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The oil from a person’s fingers or prolonged exposure to high temperature or humidity can corrode the gold-plated edge connectors and pin connectors on various devices in the 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 salty environments, 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.

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ESD results from the buildup of static electricity on the human body and certain other objects. 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 a person whose body contains such a charge touches a component in the system. This static 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. To reduce the effects of ESD, you should observe the following guidelines:

‡When working inside the system, wear a wrist-grounding strap. If a wrist- grounding strap is unavailable, touch an unpainted metal surface on the chassis periodically to neutralize any static charge.

‡If at all possible, stand on a concrete floor while working inside the system.

‡Use an antistatic floor mat when working inside the system.

‡If it is necessary to work in a carpeted area, spray the carpet with an antistatic spray and allow it to dry before beginning to work inside the system.

‡

‡

Keep components in their antistatic packaging until they are installed.

Avoid wearing clothing made of wool or synthetic materials.

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Electromagnetic interference (EMI) and radio frequency interference (RFI) from a sys- tem can adversely affect devices such as radio and television (TV) receivers operating near the system. Radio frequencies emanating from a system can also interfere with cordless and low-power telephones. Conversely, RFI from high-power telephones can cause 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 and power source or through the air like transmitted radio waves. The Federal Communi- cations Commission (FCC) publishes specific regulations to limit the amount of EMI and RFI emitted by computing equipment. Each Dell system meets these FCC regulations.

D-6 Dell Precision 210 Desktop Systems User’s Guide