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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 :
" V- b @6 ^! L/ X& K9 M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? 7 ^# t7 `" g) B5 {
L[sub]PA[/sub]应该是指LAeq,连续发声; ?, X! N9 `/ n0 A# v) H( [
L[sub]PA1S[/sub]参考如下:
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1 w5 n; j! t9 F8 _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.$ N1 x. r/ F/ b# v# H: \# U
; B8 d5 N T0 q- s0 nAs 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 Q; \- P, H; y* Z3 g
& X+ |) G& F0 D3 w$ U0 mFor rattles and squeeze toys, the result is the average of the SEL-levels and the highest of the peak levels.
- N% m6 q; B% R) z: u+ f' \$ nSubtract 10 dB from the LpA1s to get the value for one.' }! o( _4 U' }/ \5 p& t3 j3 \
6 _3 \. h7 f8 q) b0 h( D! V对EN的摇铃和挤压发声玩具的单次LpA1s
! E; P( f9 d3 j! j; O有两种途径可以算出:- V! @$ x I+ q
1、测量LAeq,算出SEL,再减去10。当t=10s,LpA1s=LAeq+10;即单次LpA1s=LAeq。
# e1 }4 L; m9 r$ x- l2、测量LAE(即SEL),再减去10。
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* d2 ~( T& N" C! g7 K ~楼主可以用声压计这样验算,t=10s的时候,LAE=LAeq+10/ O% w5 m& k, B6 c4 R' A. B
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仪器参数可以去看说明书,里面都有说的* t$ o( ~3 b3 B" o; w
, v0 \9 p1 `! g+ q3 k若有错误请前辈们指出,谢谢 |
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