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引用第0楼crystal22于2009-04-09 09:03发表的 关于音量测试 :3 y5 C9 P/ c# V+ J7 [8 e
急求:用B&K2238的音量计,请问EN71中的L[sub]PA[/sub]相当于2238中的哪个值?L[sub]PA1S[/sub]又相当于2238中的哪个值?MATTEL QSOP3600中的SEL相当于2238中的哪个值?
6 z1 \. j" J" i$ P! O" }. ZL[sub]PA[/sub]应该是指LAeq,连续发声
! Q5 I: e( _2 g5 t' V aL[sub]PA1S[/sub]参考如下:
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3 H3 I5 ^6 u9 \& J- v# IMeasure the A-weighted single-event emission sound pressure level, LpA,1s, and the C-weighted peak emission sound pressure level, LpC peak for ten movements (squeezes, beats). Carry out the test three times.
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As an alternative to SEL, LAeq can be measured and the total measurement time t registered. The single-event emission sound pressure level can then be calculated from SEL = LAeq + 10 lg(t).
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5 a( p+ w- V" U8 E; q m" @% wFor rattles and squeeze toys, the result is the average of the SEL-levels and the highest of the peak levels.
* F- _' v( M) F( C1 NSubtract 10 dB from the LpA1s to get the value for one.7 K% Y, ]+ h) j8 O7 z1 Z" {9 |
( R; L. ?5 w& [; b1 h0 E对EN的摇铃和挤压发声玩具的单次LpA1s, f- @* }0 f5 t8 c* D. T& g
有两种途径可以算出:, P# a# |# o" j
1、测量LAeq,算出SEL,再减去10。当t=10s,LpA1s=LAeq+10;即单次LpA1s=LAeq。
" x+ r: V5 C, q! P. T2、测量LAE(即SEL),再减去10。 N4 B8 \5 V2 X0 |0 s# T) N
, t( Z5 c( Q/ v4 A5 }5 k楼主可以用声压计这样验算,t=10s的时候,LAE=LAeq+10
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, D- W5 `! e4 {" Q" W7 F8 g仪器参数可以去看说明书,里面都有说的
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$ W& B4 {8 ?' X; \若有错误请前辈们指出,谢谢 |
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