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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 :9 ~$ [" r2 J$ V+ E- g
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? # |& p5 I" M9 z
L[sub]PA[/sub]应该是指LAeq,连续发声) ?% J9 A4 o5 |6 W2 j8 ]+ i9 \
L[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.$ [% K5 n k# t6 {) d8 |- L
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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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: F' v6 p" ]' U" X. ~For rattles and squeeze toys, the result is the average of the SEL-levels and the highest of the peak levels.5 j' ~4 Y: X; B
Subtract 10 dB from the LpA1s to get the value for one.- _2 N2 f& o$ v1 H6 @# b
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对EN的摇铃和挤压发声玩具的单次LpA1s
0 M% g# M# q2 ^有两种途径可以算出:- y d6 a( _0 b* a7 q) u- m; l
1、测量LAeq,算出SEL,再减去10。当t=10s,LpA1s=LAeq+10;即单次LpA1s=LAeq。
. h% L) G& O: J2 J; w: Y- c4 Y2 Q4 }2、测量LAE(即SEL),再减去10。' }8 w# g# p0 o
& b3 f6 S4 [( h8 P { C楼主可以用声压计这样验算,t=10s的时候,LAE=LAeq+10
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仪器参数可以去看说明书,里面都有说的
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7 ^- A4 Z9 T3 s( @" Y3 R, `若有错误请前辈们指出,谢谢 |
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