IEC 60651/AMD2:2000 Sound level meters; Amendment 2 was changed to IEC 61672-2:2003 Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests.
IEC 60651/AMD2:2000 Sound level meters; Amendment 2 was changed to IEC 61672-1:2002 Electroacoustics - Sound level meters - Part 1: Specifications.
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