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Subject: Re: Signal ground and chassis ground

Date: 09/06/01 at 2:24 AM
Posted by: Chris Kendall
E-mail: chrisk@ckc.com
Message Posted:

In Reply to: Signal ground and chassis ground posted by Rajendra Pokharna on 08/22/01 at 5:35 PM:

It is important to tie all mounting points to chassis via a low impedance metallic stand-off. THis allows all the filter caps to provide dual filtering (CM & DM). Multiple points are necessary to reduce possible "standing waves" that can increase radaited emissions. All connectors should also ground logic to chassis to prevent "E-fields" from being generated between logic and chassis ground that can capacitively couple to the connector pins that are often unshielded (Sub-D connector pins are exposed). Any resistors or beads added between logic and chassis will simply increase the voltage between same and increase the formation of E-fields that can radiate. Hope this helps


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