BRUEL & KJAER 2204 - Weighting Network

Weighting Networks.
The weighting networks contained in the Precision Sound Level Meter are
made to the tolerances Recommended by I.E.C. for precision sound level
meters. These tolerances apply to the functioning of the whole apparatus in a
Frequency
I
Curve A
I
Curve B Curve C
I
Tolerance limits
Hz
dB dB dB
10
,--70.4
-38.2 -14.3
5
-00
12.5
-63.4 -33.2
-11.2
5
-00
16
-56.7
-28.5
-
8.5
5
-oo
12.5
-50.5
-24.2
-
6.2 5
-5
25
-44.7
-20.4
-
4.4
5
-5
31.5
-39.4
-17.1
-
3.0
3
-3
40
-34,6
-14.2
-
2.0
3
-3
50
-30.2
-11.6 -
1.3 3 -3
63
-26.2
-
9.3
-
0.8
3
-3
80
-22.5
-
7.4
-
0.5
2 -2
100
-19.1
-
5.6
-
0.3 1
-1
4 ··
125"
-16.1
-
4.2
-
0.2 1 -1
160
-13.4
-
3.0
-
0.1 1
-1
200 -10.9
-
2.0 0
1 -1
250
-
8.6 -
1.3 0 1
-1
315
-
6.6
-
0.8
0
1
-1
400
-
4.8
-
0.5 0
1 -1
500
-
3.2
-
0.3 0
1 -1
630
-
1.9 - 0.1
0
1
-1
800
-
0.8
0
0
1 -1
1000
Q.
0
0
1 -1
1250
0.6
0
0
f
..::_1
1600 1.0 0
-
0.1
1
-1
2000
1.2
-
0.1
-
0.2
1 -1
2500 1.3
-
0.2
-
0.3
1
-1
3150 1.2
-
0.4
-
0.5
1
-1
4000
1.0
-
0.7
-
0.8 1 -1
5000
0.5
-
1.2
-
1.3 1.5 -1.5
6300
- 0.1
-
1.9
-
2.0 1.5 -2
8000
-
1.1
-
2.9
-
3.0
1.5
-3
10000
-
2.5
-
4.3
-
4.4
2
-4
12500
-
4.3
-
6.1
-
6.2
3
-6
16000
-
6.6
-
8.4
-
8.5
3
-00
20000
-
9.3
-11.1
-11.2
3
-oo
Table 5.6. Free Field Frequency Response of Precision Sound Level Meters in
dB, relative to the response at 1ooo Hz when Weighting Networks are inserted .
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