In-laboratory radio interference test on clean, dry insulators at frequency of 0.5 MHz or 1 MHz or alternatively at frequencies between 0.5 MHz and 2 MHz.Cross References:IEC 60050(471):1984IEC 60060-1:1989IEC 60137:1995EN 60168:1994IEC 60383-1:1993IEC 60383-2:1993CISPR 16-1:1993CISPR 18-2:1986CISPR 18-2/A1:1993CENELEC HD 588.1 S1:1991EN 60137:1996EN 60168:1994EN 60383-1:1996EN 60383-2:1995