GB 3785-1983 Electrical and acoustic performance and side test method of sound level meter was changed to GB/T 3785.1-2010 Electroacoustics-Sound level meters- Part 1:Specifications.
GB 3785-1983 Electrical and acoustic performance and side test method of sound level meter was changed to GB/T 3785.2-2010 Electroacoustics.Sound level meters.Part 2:Pattern evaluation tests.
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