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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 : B% V! V, G+ ^: F' P. X% f# T
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?
; a% _2 A N2 SL[sub]PA[/sub]应该是指LAeq,连续发声" X0 }" r+ X: F) U- `% _: g
L[sub]PA1S[/sub]参考如下:
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' m5 S+ E8 j3 qMeasure 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).* q. \9 f- |9 {
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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.
. x9 ~( L0 M6 ySubtract 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
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5 _: k, u$ e7 u6 y3 c+ j1、测量LAeq,算出SEL,再减去10。当t=10s,LpA1s=LAeq+10;即单次LpA1s=LAeq。% W# f) w8 [0 L* \' v8 R3 L* z/ B) E
2、测量LAE(即SEL),再减去10。# T8 f7 L3 O) G& x! Q5 n& `
% C s% E- C+ I( I8 q/ k! T楼主可以用声压计这样验算,t=10s的时候,LAE=LAeq+104 e" }1 O( }% J3 c- t
; Z4 V% p1 o( E2 n仪器参数可以去看说明书,里面都有说的
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若有错误请前辈们指出,谢谢 |
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