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: [email protected] 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. >
