At a previous employer we had this discussion with a vendor of ours. We
contacted several compotent bodies (30+) in the United Kingdom and other
countries in the European Communittee. We came up with a full 66% that would
test products to CISPR 22 at ten meters. The other 33% would allow products
t
...@ieee.org; robert.m...@engineers.com
Subject: Re: Distance of Measurements
List-Post: emc-pstc@listserv.ieee.org
Date: Friday, June 20, 1997 9:58PM
> ???: Matejic, Mirko
> Reference and therefore preferred test distance for measurements
> to CISPR 22 is 10 meters for both classe
> 寄件者: Matejic, Mirko
> Reference and therefore preferred test distance for measurements
> to CISPR 22 is 10 meters for both classes A and B.
>
> Measurements at closer distances, including 3 meters are acceptable.
> In a case of dispute results from 10 meters will take precedence.
> `^
Eric,
You are correct in your evaluation of EN 55011 (Cispr 11). Keep in mind
that the situation of not allowing distance correction is only found in
Cispr 11, NOT Cispr 22.
In reference to this specification, I had the opportunity to converse with
several Competent Bodies in reference to Ci
Eric,
You are right and this muddy point hopefully will be cleared.
CISPR SC B Interference from Industrial, Scientific and Medical
Radio Frequency Apparatus is preparing Annex to CISPR 11
which will allow testing class A equipment at 10 meters and
class B at 3 meters with 20*Log(D/d) limit relax
d to the use
>3 meter semi-anechoic chambers.
>
>Regards.
> --
>From: Martin Garwood
>To: DouglasScott
>Cc: emc-pstc
>Subject: Re: Distance of Measurements
>Date: Friday, June 13, 1997 11:32AM
>
>
>As Scott correctly quoted from EN55022 (and CISPR 22 1993
To all,
I am curious as to the impact of this version of the standard to the use
3 meter semi-anechoic chambers.
Regards.
--
From: Martin Garwood
To: DouglasScott
Cc: emc-pstc
Subject: Re: Distance of Measurements
List-Post: emc-pstc@listserv.ieee.org
Date: Friday, June 13, 1997 11:32AM
At a previous employer we had this discussion with a vendor of ours. We
contacted several compotent bodies (30+) in the United Kingdom and other
countries in the European Communittee. We came up with a full 66% that would
test products to CISPR 22 at ten meters. The other 33% would allow products
t
At 10:36 AM 6/12/97 -0700, Randy Flanders wrote:
>
>Richard and Robert:
>
>I agree with Richard, although I would recommend the opposite. I would Test
>at 10 meters, and bring the antenna in to 3 meters if I come across
>frequencies where ambients are interfering. This provides most data at th
As Scott correctly quoted from EN55022 (and CISPR 22 1993 edition), "If
the field strength measurement at 10 m cannot be made because of high
ambient noise levels or for other reasons, measurement of Class B EUTs
may be made at a closer distance, for example 3m."
It does not mention, or include c
correction of signals that
appear near ambients.
Randy Flinders
EMC Test Engineer
Emulex Network Systems
--
From: WOODS, RICHARD
To: emc-p...@ieee.org; robert.m...@engineers.com
Subject: RE: Distance of Measurements
List-Post: emc-pstc@listserv.ieee.org
Date: Thursday, June 12, 1997 7:07AM
10m
CISPR22 measurement distance is 10m. Section 11.2.1 of the standard does
allow for a test distance of less than 10m under certain conditions (e.g.
high ambient noise levels). Any measurements made at a distance other
than 10m should be corrected by 20log(10/d) (where d is the measurement
dis
Robert, as far as I know, 10M is the proper distance for CISPR B
measurements.
Steve Chin
StreamLogic Corp.
Menlo Park, CA, USA
sc...@streamlogic.com
Robert Macy (robert.m...@engineers.com) wrote:
>For measuring emissions per CISPR 22B what is the proper distance for
>the placement of the ante
Robert,
Reference and therefore preferred test distance for measurements
to CISPR 22 is 10 meters for both classes A and B.
Measurements at closer distances, including 3 meters are acceptable.
In a case of dispute results from 10 meters will take precedence.
Mirko Matejic
Coauthor of CISPR 22, E
Robert Macy wrote:
>
> For measuring emissions per CISPR 22B what is the proper distance for
> the placement of the antenna?
>
> Is it 3m? or 10m?
>
> [I'm running across reputable labs that claim there is nothing wrong
> with measuring everything at 3m, just like FCC B.]
>
>
Robert,
According to BS EN 55022 : 1995 cl. 11.2.1 Antenna-to-EUT distance I quote:
"Measurements of the radiated field shall be made with the antenna located at
the horizontal distance from the boudary of the EUT as specified in clause 6.
The boundary of the EUT is defined by an imaginary stra
10m is the standard, but other distances are allowed. If there is ever a
problem, data taken at 10 m will be used to judge your equipment. As a
practical matter, we test our equipment at 3m because of ambients. My
recommendation is to test at 10 m unless there are circumstances that
prevent it or c
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