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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 :
A7 [- j3 q# d3 ]2 X b% [) y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?
2 O! c" q7 l3 F8 G* {L[sub]PA[/sub]应该是指LAeq,连续发声/ l7 d+ U/ z5 d% \: D7 \
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.
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; U! a4 F; A: K D, y7 `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).' y) R- w0 z ?
9 j/ F/ F$ f3 C" Y) ^1 ~+ U! m* RFor rattles and squeeze toys, the result is the average of the SEL-levels and the highest of the peak levels.7 N: p5 d6 j6 t1 L, ~+ U. c4 @' z
Subtract 10 dB from the LpA1s to get the value for one.* T: V) l8 {% i9 Y8 i
8 r: g5 Z. z7 m' Z) P- w1 W对EN的摇铃和挤压发声玩具的单次LpA1s
k- Q2 _: h+ {! m7 s x+ j有两种途径可以算出:
- l6 t# S( u) z1、测量LAeq,算出SEL,再减去10。当t=10s,LpA1s=LAeq+10;即单次LpA1s=LAeq。: R) G8 I8 z% [" n" C& W
2、测量LAE(即SEL),再减去10。$ \2 S0 G# f2 S7 M2 F
0 l8 C2 {# ?& I( `! h楼主可以用声压计这样验算,t=10s的时候,LAE=LAeq+108 x5 V2 a* T3 R% R' }8 }
+ I" t( w1 v6 R- }; w' u2 a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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