D-10 Glossary Model 831 Manual
evaluation of environmental sounds. See table below.
B-Weighting: A filter that adjusts the levels of a frequency
spectrum in the same way the human ear does when exposed
to higher levels of sound. This weighting is seldom used.
See table below.
C-Weighting: A filter that adjusts the levels of a frequency
spectrum in the same way the human ear does when exposed
to high levels of sound. This weighting is most often used
for evaluation of equipment sounds. See table below.
Flat-Weighting: A filter that does not adjust the levels of a
frequency spectrum. It is sometimes an alternative selection
for the frequency-weighting selection.
Z-Weighting: Similar to a flat-weighting curve, this is a
bandpass filter with a passband from 10 Hz to 20 kHz.
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
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