标准摘要
[中文适用范围]： 补充了 IEC 244-3，规定了一般测量条件，并处理调幅和调频发射机的 AM 和 PM 噪声和交流声电平以及同步 FM 和 AM 电平。 [外文原描述]： Defines general terms relating to unwanted modulation and terms relating to amplitude and frequency-modulated transmitters. Specifies general measurement conditions and methods of measurement for FM and AM noise and hum levels.
英文名称Supplement B - Methods of measurement for radio transmitters - Part 3: Wanted and unwanted modulation - Unwanted modulation, including hum and noise modulation