Larson Davis SoundExpert LxT, Руководство пользователя

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LxT Manual Glossary and Formulas
C
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15
Flat-Weighting, or z-weighting : A filter that does not adjust
the levels of a frequency spectrum. It is usually an
alternative selection for the frequency-weighting selection.
L
eq
See “Equivalent Continuous Sound Level.”
Measurement Duration (T)
The time period of measurement. It applies to hearing
damage risk and is generally expressed in hours.
Standard : ANSI S12.19
Center Frequencies, Hz Weighting Network Frequency Response
1/3 Octave 1 Octave A B C
20 -50.4 -24.2 -6.2
25 -44.7 -20.4 -4.4
31.5 31.5 -39.4 -17.1 -3.0
40 -34.6 -14.2 -2.0
50 -30.2 -11.6 -1.3
63 63 -26.2 -9.3 -0.8
80 -22.5 -7.4 -0.5
100 -19.1 -5.6 -0.3
125 125 -16.1 -4.2 -0.2
160 -13.4 -3.0 -0.1
200 -10.9 -2.0 0
250 250 -8.6 -1.3 0
315 -6.6 -0.8 0
400 -4.8 -0.5 0
500 500 -3.2 -0.3 0
630 -1.9 -0.1 0
800 -0.8 0 0
1000 1000 0 0 0
1250 0.6 0 0
1600 1.0 0 -0.1
2000 2000 1.2 -0.1 -0.2
2500 1.3 -0.2 -0.3
3150 1.2 -0.4 -0.5
4000 4000 1.0 -0.7 -0.8
5000 0.5 -1.2 -1.3
6300 -0.1 -1.9 -2.0
8000 8000 -1.1 -2.9 -3.0
10000 -2.5 -4.3 -4.4
12500 -4.3 -6.1 -6.2
16000 16000 -6.6 -8.4 -8.5
20000 -9.3 -11.1 -11.2