The limits in this International Standard aredesigned to provide protection for broadcastreceivers in the frequency range of 30 MHzto 1 000 MHz when used in the residentialenvironment.Compliance with this standardmay not provide adequate protection for newtypes of radio transmissions or receiversused in the residential environment nearerthan 10 m to the vehicle or device.NOTE 1 Experience has shown that compliance with this standard may provide satisfactory protection for receivers of other types of transmissions when used in the residential environment, including radio transmissions in frequency ranges other than that specified.This standard applies to the emission of broadband and narrowband electromagnetic energywhich may cause interference to radio reception and which is emitted froma)vehicles propelled by an internal combustion engine,electrical means or both (see 3.1);b)boats propelled by an internal combustion engine,electrical means or both (see 3.2).Boats are to be tested in the same manner as vehicles except where they have uniquecharacteristics as explicitly stated in this standard;c)devices equipped with internal combustion engines (see 3.3).This standard includes limits and test methods for both broadband and narrowband emissions.This standard does not apply to aircraft,traction systems (railway,tramway and trolley bus),or to incomplete vehicles.NOTE 2 Protection of receivers used on board the same vehicle as the disturbance source(s)are covered by CISPR 25.The measurement of electromagnetic disturbances while the vehicle is connected to power mains for charging is not covered in this standard.The user is referred to appropriate IEC and CISPR standards which define measurement techniques and limits for this condition.

First published in Australia as AS 2557-1982.First published in New Zealand as NZS 6621:1972.AS 2557-1982 and NZS 6621:1972 revised, amalgamated and redesignated as Joint Standard AS/NZS 2557:1992.Second edition 1999.Jointly revised and redesignated as AS/NZS CISPR 12:2004. First published in Australia as AS 2557-1982. First published in New Zealand as NZS 6621:1972. AS 2557-1982 and NZS 6621:1972 revised, amalgamated and redesignated as Joint Standard AS/NZS 2557:1992. Second edition 1999. Jointly revised and redesignated as AS/NZS CISPR 12:2004.