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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 :
a2 e- U7 [- Q, 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? + a. _) _) E1 x
L[sub]PA[/sub]应该是指LAeq,连续发声
; m6 H2 \% g. s# H+ h8 T! jL[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.8 R9 C4 v: b' y
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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).4 o* g) Y: w; p1 ^4 h' R
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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.
! T; k% ]! j. ^4 b" m6 ZSubtract 10 dB from the LpA1s to get the value for one.' o6 b" V' S" i9 q
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对EN的摇铃和挤压发声玩具的单次LpA1s
6 {3 U4 v( W7 E3 ?( W! Y* m有两种途径可以算出:
( p4 j. M1 o# g8 _1、测量LAeq,算出SEL,再减去10。当t=10s,LpA1s=LAeq+10;即单次LpA1s=LAeq。
, v& ^/ M* B7 g: W2、测量LAE(即SEL),再减去10。( R- j2 \ y% A" W! T5 s
5 B4 e# ^* Z! }) O2 M: a* a6 N楼主可以用声压计这样验算,t=10s的时候,LAE=LAeq+10. m0 o" i6 V; s7 x3 p$ y
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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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若有错误请前辈们指出,谢谢 |
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