Take the reading. It's the only way to be sure..

It is not unusual for a product to pass @ 3m and then fail at 10m (or vice 
versa).

Thanks!

Charles Grasso
W: 303-706-5467

From: John Woodgate [mailto:j...@woodjohn.uk]
Sent: Monday, October 28, 2019 1:30 AM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Reading or Limit Conversion?


 This message originated outside of DISH and was sent by: 
owner-emc-p...@listserv.ieee.org<mailto:owner-emc-p...@listserv.ieee.org>

This inconsistency (in the underlying CISPR standards) should be addressed by 
CISPR, but it is difficult to get consensus whenever it is discussed.

Best wishes

John Woodgate OOO-Own Opinions Only

J M Woodgate and Associates www.woodjohn.uk<http://www.woodjohn.uk>

Rayleigh, Essex UK
On 2019-10-28 07:05, Charlie Blackham wrote:
David

Hmm, different standards appear to deal with this differently:

  *   EN 55011:2009 section 6.2.2.3 instructs you to normalise the measured 
data to the specified distance in the standard
  *   EN 55032:2015 section 9 instructs you to adjust the limits (in fact it 
gives limits for 3 and 10m which are 10 dB apart and not 10.45dB apart if you 
extrapolate using 20LogD)
  *   ANSI 63-4:2014 instructs you to extrapolate the results

If the standard or test method doesn't specify, I guess the important thing is 
to be clear in the report as to what's been done.

Regards
Charlie

Charlie Blackham
Sulis Consultants Ltd
Tel: +44 (0)7946 624317
Web: https://sulisconsultants.com/
Registered in England and Wales, number 05466247

From: itl-emc user group <itl...@itl.co.il><mailto:itl...@itl.co.il>
Sent: 28 October 2019 06:37
To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG>
Subject: [PSES] Reading or Limit Conversion?

A number of standards list radiated emission limits in the frequency range of 
30-1000 MHz for test distance greater than 3 or 10 meters.
Testing is normally performed at either 3 meters or 10 meters on an Open Area 
Test Site.
A question has arisen concerning reporting the test results in these cases.
Any opinions concerning which should be converted:
a.       Convert the limit to the relevant test distance (3 meters or 10 
meters) by adding correction factor or
b.      Convert the reading to the unit and test distance listed in the 
standard (convert dBµV to µV and add correction factor for distance)
On some occasions I have seen option b. above used.
Which option is preferable?
All opinions welcome

Regards,
David Shidlowsky | Technical Reviewer
Address 1 Bat-Sheva St. LOD 7120101 Israel
Tel 972-8-9186113 Fax 972-8-9153101
Mail : 
dav...@itlglobal.org<mailto:dav...@itlglobal.org>/dav...@itl.co.il<mailto:dav...@itl.co.il>/e...@itl.co.il
  Web www.itlglobal.org<http://www.itlglobal.org/>

[cid:image001.png@01D58D9E.A73400D0]ITL Waze: https://waze.com/ul/hsv8vccn2j

Fill out Customer Satisfaction 
Survey<http://app.sqm.co.il/SitePages/Questionnaire.aspx>
Global Certifications You Can Trust
This e-mail message may contain privileged or confidential information.
If you are not the intended recipient, you may not disclose, use, disseminate, 
distribute, copy or rely upon this message or attachment in any way. If you 
received this e-mail message in error, please return by forwarding the message 
and its attachments to the sender.


-
----------------------------------------------------------------

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)<http://www.ieee-pses.org/list.html>
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)<http://www.ieee-pses.org/list.html>
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)<http://www.ieee-pses.org/list.html>
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>

Reply via email to