BRUEL & KJAER 2240 - Page 11

Integrating-averaging Sound Level Meter Type 2240 – Instruction Manual6
Table 2.1
Frequency weight-
ings according to
IEC 61672 – 1,
Table 2
Nominal Frequency
(Hz)
Exact Frequency
(6 digits)
(Hz)
Frequency Weightings
(1 decimal)
(dB)
AC
10 10 –70.4 –14.3
12.5
16
20
12.5893
15.8489
19.9526
–63.4
–56.7
–50.5
–11.2
–8.5
–6.2
25
31.5
40
25.1189
31.6228
39.8107
–44.7
–39.4
–34.6
–4.4
–3.0
–2.0
50
63
80
50.1187
63.0957
79.4328
–30.2
–26.2
–22.5
–1.3
–0.8
–0.5
100
125
160
100.000
125.893
158.489
–19.1
–16.1
–13.4
–0.3
–0.2
–0.1
200
250
315
199.526
251.189
316.228
–10.9
–8.6
–6.6
0.0
0.0
0.0
400
500
630
398.107
501.187
630.957
–4.8
–3.2
–1.9
0.0
0.0
0.0
800
1000
1250
794.328
1000.00
1258.93
–0.8
0.0
+0.6
0.0
0.0
0.0
1600
2000
2500
1584.89
1995.26
2511.89
+1.0
+1.2
+1.3
–0.1
–0.2
–0.3
3150
4000
5000
3162.28
3981.07
5011.87
+1.2
+1.0
+0.5
–0.5
–0.8
–1.3
6300
8000
10000
6309.57
7943.28
10000.0
–0.1
–1.1
–2.5
–2.0
–3.0
–4.4
12500
16000
20000
12589.3
15848.9
19952.6
–4.3
–6.6
–9.3
–6.2
–8.5
–11.2