[SI-LIST] Re: Book - (Chassis - signal ground)
- From: "Charles Grasso" <cgrassosprint1@xxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 22 Jun 2001 07:49:09 -0600
Hi all,
You might be interested in some EMC training software
that analyses this issue in excrutiating detail.
If you are interested go to the RMCEMC Website
at http://www.ieee.org/rmcemc
Charles Grasso
RMCEMC ViceChair
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Bill Owsley
Sent: Friday, June 22, 2001 7:43 AM
To: si-list@xxxxxxxxxxxxx; 'si-list@xxxxxxxxxxxxx'
Subject: [SI-LIST] Re: Book - (Chassis - signal ground)
I seem to recall the subject was vigorously debated before and may be in
the archives.
- Bill
At 01:38 AM 06/22/2001 -0700, Larry Miller wrote:
>This is impossible in any but the smallest systems.
>
>We have quite a number of EMI experts on this reflector; I am surprised
that
>we are not hearing from them....
>
>The problem is much more complex than the posts to this thread indicate.
>
>Larry Miller
>
>-----Original Message-----
>From: Ashok Babu K [mailto:k.ashokbabu@xxxxxxxxxxxxx]
>Sent: Thursday, June 21, 2001 11:55 PM
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re: Book - (Chassis - signal ground)
>
>
>
>I feel that if signal ground is to be connected to the chassis ground, then
>that connection should be done at one single point only. If connections are
>done at multiple points, that would eventually cause ground loops. Such
>ground loops will cause EMI radiations, ground bounce etc.
>
>More discussions are welcome.
>
>Regards,
>Ashok.
>
>
>----- Original Message -----
>From: "Paul Hamilton" <paulh@xxxxxxxxxxxx>
>To: <si-list@xxxxxxxxxxxxx>
>Sent: Friday, June 22, 2001 12:06 PM
>Subject: [SI-LIST] Re: Book - (Chassis - signal ground)
>
>
> >
> > An issue to consider might be ESD (EMC electrostatic discharge)
> > susceptibility. A complex system could present several current paths for
>ESD
> > strikes which may be difficult to manage. Isolating signal ground from
> > chassis (and also ensuring that signal ground cannot take an ESD strike)
> > would be one way to guard against ESD hassles. I've had grief with a
>simple
> > clam style enclosure about the size of a telephone - and chassis was
> > isolated from signal ground except at one point.
> >
> > Paul Hamilton.
> >
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
>On
> > Behalf Of Alex Horvath
> > Sent: Friday, 22 June 2001 9:34
> > To: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Re: Book
> >
> >
> > Someone recommended Henry Ott's book "noise reduction techniques in
> > Electronic Systems" and I have this book and didn't find it very useful
>for
> > chassis grounding (it's very old). He actually recommends separating
>chassis
> > and digital ground. I think this is based on how systems in the past
often
> > had shielded cables going from one chassis to another. Often the ground
> > potentials are different in those systems and large currents can flow in
>the
> > shield and thus in the chassis. The large currents in the chassis can
>cause
> > noise and or the ground reference to change if the digital ground is
part
>of
> > the chassis. Most telecomm systems I work with today don't have any
>shielded
> > cables or for that matter any ground connections between chassis. Also,
>all
> > of the telecom companies I have worked at have tied digital ground to
the
> > chassis (also PC's are made this way).
> >
> > snip ..
> >
> >
> > _____________________________________________________
> > Thorlock International Ltd. enquiries@xxxxxxxxxxxx
> > +61 8 9351 9200 (tel) +61 8 9351 9522 (fax)
> >
> >
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> >
> >
>
>
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----------------------------
Bill Owsley, owsley@xxxxxxxxx
919) 392-8341
Compliance Engineer
Cisco Systems
7025 Kit Creek Road
POB 14987
RTP. NC. 27709
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