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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 :6 c$ L% n) m. 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?
- E% Q" N* x& V. H) L+ wL[sub]PA[/sub]应该是指LAeq,连续发声
1 w$ X" M8 ]. R) B N2 T4 c! t# |# DL[sub]PA1S[/sub]参考如下:. j0 [! x7 n8 Z: m
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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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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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9 i) J& B7 H, ZFor rattles and squeeze toys, the result is the average of the SEL-levels and the highest of the peak levels.
( ]" p( e& j. l% {! _9 }5 w) uSubtract 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( E! D7 U$ M/ R
有两种途径可以算出:( W% O; N( r9 G O
1、测量LAeq,算出SEL,再减去10。当t=10s,LpA1s=LAeq+10;即单次LpA1s=LAeq。
) d) h9 o' Z5 Y- |; ?( z2、测量LAE(即SEL),再减去10。
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Y2 o. H- A2 m+ o* D7 l2 Y楼主可以用声压计这样验算,t=10s的时候,LAE=LAeq+10
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/ f' Z* O2 f9 V- Z仪器参数可以去看说明书,里面都有说的" s' I" }$ ~/ j6 ?
, R. e% Y! o& A2 l: \" P若有错误请前辈们指出,谢谢 |
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