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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 :
/ x2 y ]3 q a$ [& 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? $ _( j4 k M0 C. ?* [: K
L[sub]PA[/sub]应该是指LAeq,连续发声
8 {: B' Y# R$ X; o; bL[sub]PA1S[/sub]参考如下:. q. x4 Q% |+ y9 j
& Z' }* D0 X; ]- H3 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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' ]; n3 @- E/ y4 s6 T8 r9 xAs 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).- p9 i4 O8 p3 _# @& l
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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.* V m) e. [# f7 c5 W. i
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; z. P- K9 Z! K9 F, a) U, h( a
有两种途径可以算出:' E) d* s; X% c
1、测量LAeq,算出SEL,再减去10。当t=10s,LpA1s=LAeq+10;即单次LpA1s=LAeq。
" }) A7 N2 V1 ?3 z1 u) {/ W2、测量LAE(即SEL),再减去10。2 l8 {# E1 s& E% B: w- a
0 C4 O6 _6 s) E" g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 R+ ? T6 l1 C" k ~0 ]8 O
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若有错误请前辈们指出,谢谢 |
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