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Chassis gnd plane on PCB to make comms circuitry more noise immune?

treez

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Hi,
We all know the chassis can't float otherwise electrical noise abounds......so we bond chassis to circuit ground.
But why would we then need a chassis ground plane on a PCB that contains sensitive comms and control circuitry?

2nd page of this says a chassis gnd plane is needed..

..why is this?
 

barry

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It says nothing of the sort. It explicitly says that your chassis ground plane is decoupled from your pcb.
 
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    treez

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