I would just like to point out that the CISPR22 reference which has been
quoted ie "only class B equipment may be assessed at 3m ........ etc" is
actually a note in the specification and therefore is for "guidance only"
and has no "legal status" ?
Regards Andy Griffin
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At 04:40 13/6/97 -0400, you wrote:
>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
>Date: Friday, June 13, 1997 11:32AM
>
>
>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 class A, only B. Class A equipment must
>be tested at 10 metres. When introduced, this was a fundamental change,
>as this statement was not in previous versions of CISPR22. Some labs
>choose to overlook it, particularly those having OATS with unacceptably
>high ambients clouding the spectrum.
>
>When all else fails, read the standard.
>
>Best Regards.
>>
>
>
Regards Andy Griffin
********************************************************
EMiSoft Limited - Test and Assessment
Software Solutions
Uk Tel +44 (0)468 188244
Uk Fax +44 (0)1793 522214
USA Tel/Fax +408 356 1980
Email [email protected]
http://www.emisoft.co.uk
Compuserve 100653,2442
We write software - we don't sell equipment
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