[SI-LIST] 回复:Chassis Ground connected to Signal Ground

Dear alan

I have meet some similar problem to that=2E The ESD engineer want the cha=
ssis ground not connected to the signal ground=2E The EMI engineer said t=
hat the chassis ground and signal ground should be connected by capacitor=
=2E The SI engineer want the two ground be connected directly=2E

I have meet some SI problem when the chassis ground is not connected to t=
he signal ground=2E If the two ground are connected directly=2C I suggust=
 that the power ground noise should be cared=2E =


Best Regards

Zhangkun
2004=2E6=2E18

----- =D4=AD=D3=CA=BC=FE -----
=B4=D3=3A =22Pfeifer=2C Alan=22 =3Calan=2Epfeifer=40lsil=2Ecom=3E
=C8=D5=C6=DA=3A =D0=C7=C6=DA=CB=C4=2C =C1=F9=D4=C2 17=C8=D5=2C 2004 =CF=C2=
=CE=E711=3A22
=D6=F7=CC=E2=3A =5BSI-LIST=5D Chassis Ground connected to Signal Ground

=3E Hi Experts=2C
=3E I am using a metal cage that protrudes through the bulk head of a =

=3E product=2EIn the past=2C we connected the pins of that cage to ground=
 =

=3E through 1000 pF
=3E caps=2E  While monitoring this list a few months ago=2C there was a l=
ong
=3E discussion on the connection of logic and chassis grounds=2E
=3E =

=3E My question is this=3A  Is it better to use the 1000 pF caps to tie t=
he
=3E chassis ground to the logic (signal) ground or better to tie the =

=3E two grounds
=3E directly together=3F  I am interested in both SI issues and EMI issue=
s=2E
=3E =

=3E Thanks=2C
=3E Alan
=3E ------------------------------------------------------------------
=3E To unsubscribe from si-list=3A
=3E si-list-request=40freelists=2Eorg with =27unsubscribe=27 in the Subje=
ct field
=3E =

=3E or to administer your membership from a web page=2C go to=3A
=3E http=3A//www=2Efreelists=2Eorg/webpage/si-list
=3E =

=3E For help=3A
=3E si-list-request=40freelists=2Eorg with =27help=27 in the Subject fiel=
d
=3E =

=3E List FAQ wiki page is located at=3A
=3E                http=3A//si-list=2Eorg/wiki/wiki=2Epl=3FSi-List=5FFAQ
=3E =

=3E List technical documents are available at=3A
=3E                http=3A//www=2Esi-list=2Eorg
=3E =

=3E List archives are viewable at=3A     =

=3E             http=3A//www=2Efreelists=2Eorg/archives/si-list
=3E or at our remote archives=3A
=3E             http=3A//groups=2Eyahoo=2Ecom/group/si-list/messages
=3E Old (prior to June 6=2C 2001) list archives are viewable at=3A
=3E             http=3A//www=2Eqsl=2Enet/wb6tpu
=3E  =

=3E =

=3E 

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List FAQ wiki page is located at:
                http://si-list.org/wiki/wiki.pl?Si-List_FAQ

List technical documents are available at:
                http://www.si-list.org

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: