10. FREQUENCY WEIGHTING
CHARACTERISTICS OF A and C
NETWORKS
Frequency A Weighting C Weighting Tolerance
Hz
Charac.
Charac.
(IEC 61672 class 2)
31.5
-39.4 dB
-3 dB
± 3.5 dB
63
-26.2 dB
-0.8 dB
± 2.5 dB
125
-16.1 dB
-0.2 dB
± 2.0 dB
250
-8.6 dB
0 dB
± 1.9 dB
500
-3.2 dB
0 dB
± 1.9 dB
1 K
0 dB
0 dB
± 1.4 dB
2 K
+1.2 dB
-0.2 dB
± 2.6 dB
4 K
+1 dB
-0.8 dB
± 3.6 dB
8 K
-1.1 dB
-3 dB
± 5.6 dB
11. TIME WEIGHTING ( FAST and
SLOW ) CHARACTERISTICS
Time Weighting Max. response
Tolerance
Charac.
ref. continuous signal
(IEC 61672 class 2)
F ( Fast )
- 1.0 dB
+ 1 dB
- 2 dB
S ( Slow )
- 4.1 dB
± 2 dB
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