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Electrostatic discharge (ESD) protection
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Model 6276 User Guide
2 • Chassis specifications
Mating EMC gaskets and strips are used on the chassis, front panels of boards, and optional filler panels. An
EMC gasket is attached to the bottom of the chassis (front view), and an EMC strip is attached to the top.
Plug-in boards have the corresponding mates on the opposite side (see
figure 6
).
Figure 6. EMC strip and gasket on chassis and cards
The EMC strip on the left side of the board mates with the EMC gasket attached to the chassis when it is
plugged into the first slot. Each board mates together with corresponding gaskets/strips.
In addition, all metal components of the subrack are surface treated and conductive. Top, bottom, sides and
rear EMC covers provide mechanical protection and EMC shielding on the subrack. Retaining clips ensure
conductive connection.
The chassis contains an optional frame ground to signal ground jumper. By default, in all ForeFront Half-Pipe
products, this jumper is not installed. This means that frame ground (the electrical potential of the chassis shell
itself and all panels, screws, etc. that are connected to it) is electrically isolated from the signal ground (the elec-
trical potential corresponding to “0 volts” with respect to the power supplies and cards in the chassis). Patton
Electronics recommends that this isolation be maintained, in order to improve the EMC characteristics of the
system and the integrity of the two distinct grounds.
See the chapter on installation and maintenance for further information on the jumper settings.
Electrostatic discharge (ESD) protection
The 6276 ForeFront Half-Pipe chassis provides ESD protection in compliance with IEEE 1101.10. ESD con-
tacts are embedded inside and in the front section of card guides for making early as possible contact with a
discharge strip on one or both, the upper and/or lower edge of the plug-in board/module. Only one card guide
per slot (both front and rear) contain ESD clips. The ESD clip in the card guide is connected to the chassis
GND (ground).