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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 :
5 y4 M! Y; L. B& A" `4 D& t2 J0 c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? # K) H' D+ k7 T g4 {
L[sub]PA[/sub]应该是指LAeq,连续发声. Z- E# c1 O8 [& I5 j8 G
L[sub]PA1S[/sub]参考如下:/ O# s+ Q$ ?8 e$ X3 A
5 l' r. V- T9 Z0 n' L" ^Measure 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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8 ^8 e* C9 E2 E/ T( W& ^& BAs 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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3 @: g8 h# V+ [For rattles and squeeze toys, the result is the average of the SEL-levels and the highest of the peak levels.
( c D' \: ^% n& U% bSubtract 10 dB from the LpA1s to get the value for one.
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1 p |9 s" X3 E对EN的摇铃和挤压发声玩具的单次LpA1s0 M! k1 Q3 {# P/ b
有两种途径可以算出:# d7 k- m, z3 y7 E; ]: w
1、测量LAeq,算出SEL,再减去10。当t=10s,LpA1s=LAeq+10;即单次LpA1s=LAeq。9 Z+ Q, O+ b, P' e2 V9 R
2、测量LAE(即SEL),再减去10。: P3 o: @, |' v! N) i
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楼主可以用声压计这样验算,t=10s的时候,LAE=LAeq+105 [- o8 D0 B9 t' @/ z( m& V5 e
7 r+ S5 a7 B1 P仪器参数可以去看说明书,里面都有说的+ ~% b. [+ H2 M% k1 d
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若有错误请前辈们指出,谢谢 |
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