You bet! I've done it many times. It's not perfect, but does give you
a rough estimate. The only requirement is being able to butcher the
power cord so you can get tat the individual conductors. Putting both
through the clamp gives you the CM. Then take either L or N and twist it
180 degrees. Put both in the clamp and you get the DM component.
Again, not perfect, but a good and simple way to start understanding
what you need for a filter.
Best regards,
Brent G DeWitt
Milford, MA
On 7/2/2020 1:57 AM, Amund Westin wrote:
I will try to get access to the product next week and do my own
measurements for conducted emission (generic light industry limit).
The lab does only offer me a spectrum analyzer and a current clamp for
measuring / troubleshooting. Not a LISN.
From the book «EMI troubleshooting techniques», Michel Mardiguian,
there is a way to measure CM and DM noise with a current clamp.
I’m planning to follow that procedure and do some initial
measurements, and then repeat the measurements after modifications.
Assume that improvements and lower levels under these measurements,
will also be reflected when later on doing this with a LISN.
Anyone who have tried such troubleshooting technique?
Best regards / Mit freundlichen Grüßen / Mvh
*Amund Westin*
**********************************
/Cell: (+47) 920 17 031/
/E-mail: //am...@westin-emission.no/ <mailto:am...@westin-emission.no>//
/**********************************/
*Fra:*Grasso, Charles [Outlook]
*Sendt:* 29. juni 2020 16:40
*Til:* EMC-PSTC@LISTSERV.IEEE.ORG
*Emne:* Re: [PSES] Conducted emission - AC line filters makes it worse
Hi – This IS an interesting problem!
My question: Is the 3 –phase configures as a delta or a wye configuration?
Also – What is the AC device (power supply/motors etc..)
[Working From Home]
Charles Grasso
Crackpot Theorist
Dish Technologies
(c) 303-204-2974
(h) 303-317-5530
(e ) charles.gra...@dish.com <mailto:charles.gra...@dish.com>
(e2) chasgra...@gmail.com <mailto:chasgra...@gmail.com>
*From:*Patrick <conwa...@gmail.com <mailto:conwa...@gmail.com>>
*Sent:* Sunday, June 28, 2020 9:50 AM
*To:* EMC-PSTC@LISTSERV.IEEE.ORG <mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
*Subject:* Re: [PSES] Conducted emission - AC line filters makes it worse
This message originated outside of DISH and was sent by:
owner-emc-p...@listserv.ieee.org
<mailto:owner-emc-p...@listserv.ieee.org>
Hi Amund
This sounds like a very interesting problem. Likely many people will
have advice. Maybe get lucky and someone will have had this exact
same problem.
I'd like to help if I can. Do you have more information on the
failure? What test standard and test method did you use? How much
over the limit? What filters were used and how were they connected?
It could be an installation of good filters, but not wired for the
emission type. Also could be wrong filter type for problem?
Very interesting.
On Sun, Jun 28, 2020, 2:58 AM Amund Westin <am...@westin-emission.no
<mailto:am...@westin-emission.no>> wrote:
A 3-phase product has three internal AC driven devices.
The product fails on Conducted emission. When connecting AC
filters to
each internal AC driven devices, the emission gets even worse.
Any clue about this phenomena? Is it some kind of impedance mismatch
which derate the filters performance?
BR
Amund
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list. To post a message to the list, send your
e-mail to <emc-p...@ieee.org <mailto:emc-p...@ieee.org>>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities
site at http://product-compliance.oc.ieee.org/ can be used for
graphics (in well-used formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://www.ieee-pses.org/list.html (including how to
unsubscribe)
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <sdoug...@ieee.org <mailto:sdoug...@ieee.org>>
Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org>>
For policy questions, send mail to:
Jim Bacher: <j.bac...@ieee.org <mailto:j.bac...@ieee.org>>
David Heald: <dhe...@gmail.com <mailto:dhe...@gmail.com>>
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list. To post a message to the list, send your
e-mail to <emc-p...@ieee.org <mailto:emc-p...@ieee.org>>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities
site at http://product-compliance.oc.ieee.org/ can be used for
graphics (in well-used formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://www.ieee-pses.org/list.html (including how to
unsubscribe)
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <sdoug...@ieee.org <mailto:sdoug...@ieee.org>>
Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org>>
For policy questions, send mail to:
Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org>>
David Heald <dhe...@gmail.com <mailto:dhe...@gmail.com>>
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list. To post a message to the list, send your
e-mail to <emc-p...@ieee.org <mailto:emc-p...@ieee.org>>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities
site at http://product-compliance.oc.ieee.org/ can be used for
graphics (in well-used formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://www.ieee-pses.org/list.html (including how to
unsubscribe)
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <sdoug...@ieee.org <mailto:sdoug...@ieee.org>>
Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org>>
For policy questions, send mail to:
Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org>>
David Heald <dhe...@gmail.com <mailto:dhe...@gmail.com>>
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society
emc-pstc discussion list. To post a message to the list, send your
e-mail to <emc-p...@ieee.org <mailto:emc-p...@ieee.org>>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities
site at http://product-compliance.oc.ieee.org/ can be used for
graphics (in well-used formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://www.ieee-pses.org/list.html (including how to
unsubscribe)
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <sdoug...@ieee.org <mailto:sdoug...@ieee.org>>
Mike Cantwell <mcantw...@ieee.org <mailto:mcantw...@ieee.org>>
For policy questions, send mail to:
Jim Bacher <j.bac...@ieee.org <mailto:j.bac...@ieee.org>>
David Heald <dhe...@gmail.com <mailto:dhe...@gmail.com>>
-
----------------------------------------------------------------
This message is from the IEEE Product Safety Engineering Society emc-pstc discussion
list. To post a message to the list, send your e-mail to <emc-p...@ieee.org>
All emc-pstc postings are archived and searchable on the web at:
http://www.ieee-pses.org/emc-pstc.html
Attachments are not permitted but the IEEE PSES Online Communities site at
http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used
formats), large files, etc.
Website: http://www.ieee-pses.org/
Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)
List rules: http://www.ieee-pses.org/listrules.html
For help, send mail to the list administrators:
Scott Douglas <sdoug...@ieee.org>
Mike Cantwell <mcantw...@ieee.org>
For policy questions, send mail to:
Jim Bacher: <j.bac...@ieee.org>
David Heald: <dhe...@gmail.com>
