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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 :
# r- J" ~" P, Y7 e( ?* S% h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?
. H, i' b, C' YL[sub]PA[/sub]应该是指LAeq,连续发声
) a9 M# R, ]' [; {( Q5 E/ d' pL[sub]PA1S[/sub]参考如下:
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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.3 J* a- d3 g4 A$ U. o
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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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For rattles and squeeze toys, the result is the average of the SEL-levels and the highest of the peak levels.8 V' w$ Y" [* ^9 W% |
Subtract 10 dB from the LpA1s to get the value for one.
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对EN的摇铃和挤压发声玩具的单次LpA1s( s \; c; y( d& W( R% \8 _9 ~
有两种途径可以算出:
. l1 q: X q& a8 j1、测量LAeq,算出SEL,再减去10。当t=10s,LpA1s=LAeq+10;即单次LpA1s=LAeq。* [9 F8 b8 L2 R- R
2、测量LAE(即SEL),再减去10。
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楼主可以用声压计这样验算,t=10s的时候,LAE=LAeq+10
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9 E( x" o% C$ j, f9 z, W3 O" Z; S# S仪器参数可以去看说明书,里面都有说的' p7 r$ c1 B5 v
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若有错误请前辈们指出,谢谢 |
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