IEC 60651:2001
声波计(第 1.2 版;第 1 版:1979 年合并 修改件1:1993 和 2:2000;由 IEC 61672-1:2002 和 IEC 61672-2:2003 取代)
Sound Level Meters (Edition 1.2; Edition 1:1979 Consolidated with Amendments 1:1993 and 2:2000; Replaced by IEC 61672-1:2002 and IEC 61672-2: 2003)