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Subject: Re: Signal ground and chassis ground

Date: 06/02/01 at 12:12 PM
Posted by: Bhooshan Urva
E-mail: bhooshan@inkra.com
Message Posted:

In Reply to: Re: Signal ground and chassis ground posted by chaman on 06/01/01 at 9:41 PM:

Hello,There is a DC-DC converter in each plugin card.The ground reference (signal ground) of each ofthese outputs are connected together throughthe backplane. However, I have seen variousschemes used for connecting the signal groundto the chassis ground, i.e. through a 1Meg Ohmresistor, a ferrite bead, etc. I am not sureabout the reason for this. I agree thatthe signal ground is noisy. But why not makea solid connection between that noisy ground andthe chassis. Is that an EMC issue or a safetyissue?Thanks./Bhooshan


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