CISPR does NOT require the Ground choke..
Thank you
Charles Grasso
(Capn Hook)
--
From: Muriel Bittencourt de Liz[SMTP:mur...@inep.ufsc.br]
Sent: Monday, December 07, 1998 3:46 AM
To: Helge Knudsen
Cc: 'EMC-PSTC - IEEE'
Subject: Re: Doubt on LISN utilization
the matter.
Best regards
Helge Knudsen
Jyske EMC
Denmark
hknud...@jyske-emc.com
-Original Message-
From: Cortland Richmond [SMTP:72146@compuserve.com]
Sent: lordag, december 05, 1998 05:43
To: Gary McInturff; ieee pstc list
Subject:RE: Doubt on LISN utilization
Jyske EMC
Denmark
hknud...@jyske-emc.com
-Original Message-
From: Cortland Richmond [SMTP:72146@compuserve.com]
Sent: lørdag, december 05, 1998 05:43
To: Gary McInturff; ieee pstc list
Subject:RE: Doubt on LISN utilization
As I recall, when testing conducted
Bittencourt de Liz
Cc: emc-p...@majordomo.ieee.org
Subject: RE: Doubt on LISN utilization
I have a recollection that at one point VDE required the choke in the
ground
line of the LISN. Vaguely remembered it had to do with extremely long
build
grounds as in high rise buildings etc
-emc.com
-Original Message-
From: Cortland Richmond [SMTP:72146@compuserve.com]
Sent: lørdag, december 05, 1998 05:43
To: Gary McInturff; ieee pstc list
Subject:RE: Doubt on LISN utilization
As I recall, when testing conducted emissions to VDE 0871, it was required
As I recall, when testing conducted emissions to VDE 0871, it was required
to observe noise in the two powered lines with the switch both open and
closed, and use the higher result. Some power supplies would in fact give
different results if the ground was opened.
An aside: I used to work at
Subject:Re: Doubt on LISN utilization
It is possible to get noise induced on all cabling at the same time.
In
this case it will be also be present on the ground lead. To reduce
this
noise ground chokes are used. It is also extra attenuation for
common
mode
From: rehel...@mmm.com
Subject: Re: Doubt on LISN utilization
Date: Fri, 4 Dec 1998 11:25:50 -0600
To: Muriel Bittencourt de Liz mur...@inep.ufsc.br
Cc: emc-p...@majordomo.ieee.org
It is possible to get noise induced on all cabling at the same time
It is possible to get noise induced on all cabling at the same time. In
this case it will be also be present on the ground lead. To reduce this
noise ground chokes are used. It is also extra attenuation for common
mode currents.
Bob Heller
Senior EMC Engineer
3M Company
Yes, you're doing it right.
With the transformer between the AC mains and the LISN it is essentially
out of the loop. The spectrum analyzer looks through the LISN at the
EUT's conducted emissions.
You see, there is quite a filter between the LISN and the AC mains, so
adding the transformer
Hi Chris,
Muriel has clearly defined his EUT=his product. Your first scenario
expanded the definition of EUT to (Product + a dedicated transformer). Is
it appropriate?
Best Regards,
Barry Ma
-
Original Text
From: Chris Dupres chris_dup...@compuserve.com, on 10/21/98 11:24 PM:
I second what Ed said. Please allow me to add some tinier points to the
conducted emission test we usually run inside a screen room (S/R).
(1) Single point grounding of outer surface of S/R. A S/R may have more
than one grounding, such as building earth and power earth, all grounding
points
Muriel:
That circuit is OK. All source impedances upstream of the LISN are undefined.
The source power voltage applied to the lISN can be anything as long as it
doesn't exceed the LISN max voltage rating. The LISN, by definition, produces
the standardized source impedance for the EUT.
Yes,
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