NFS 31 139:1998被替代
Sound Calibrators
出版：Association Francaise de Normalisation
专家解读视频
基本信息
标准编号： NFS 31 139:1998
标准类别：MiscPublication
出版单位：Association Francaise de Normalisation
标准页数：15
标准简介
Specifies the performance requirements for three classes of sound calibrator. Sound calibrators are designed to produce a known effective sound pressure level or levels at a specified frequency or frequencies when coupled to specified models of microphone or specified configurations
