User manual

Wide Bank 28 DS3 - Release 2.4 July 2004 5-3

Electrical Installation and Cabling

Static-Sensitive Equipment Handling Procedures

CAUTION! THE WIDE BANK CONTAINS CIRCUIT CARDS AND COMPONENTS THAT

ARE SUBJECT TO DAMAGE BY ELECTROSTATIC DISCHARGE (ESD). ALWAYS USE THE

FOLLOWING PROCEDURE WHENEVER HANDLING PLUG-IN CIRCUIT CARDS.

NOTE: A grounding wrist strap consists of an electrically conductive elastic wrist band

with a grounding wire for connection to the equipment chassis or a common ground point.

Static electricity is always present and is easily picked up from shoes and clothing. Using anti-static

procedures will minimize the chances of damaging sensitive semiconductor components.

1. Wear a grounding wrist strap whenever handling, touching, inspecting, installing, or removing

plug-in circuit cards.

2. Test the grounding wrist strap before using.

Use an ohmmeter to check the resistance of a grounding wrist strap.

- Connect one meter lead to wrist strap.

- Connect other meter lead to metal clip or banana plug at end of grounding wire.

A resistance of one megohm to ten megohms (megohm = one million ohms) is typical and

will provide adequate protection to equipment and user.

DO NOT use the wrist strap if the resistance is more than 35 megohms because it will not

protect the equipment from ESD damage.

DO NOT use the wrist strap if the resistance is less than 0.75 megohms (750,000 ohms)

because it will not protect you from high voltage shock hazards.

3. Before touching a circuit card, momentarily touch the grounded equipment rack or chassis to

discharge any static buildup.

4. Before inserting or removing a circuit card from a storage bag, momentarily ground or hold the

anti-static plastic storage bag to discharge any static buildup.

5. Do not touch any components or printed wiring on the circuit card. Hold the card by its edges

or plastic handles.

6. Always store circuit cards in an anti-static storage bag. Whenever possible, use the same storage

bag the card or replacement card came in.

7. If a circuit card is to be returned to the factory, always ship the circuit card inside an anti-static

storage bag.