4)Select " A " weighting.
5)Adjust the " Calibration VR " ( 3-11, Fig. 1 ) carefully
with a " - " screw driver until the display reading value
within " 94 +/- 0.2 " dB.
12. FREQUENCY WEIGHTING
CHARACTERISTICS OF
A & 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
13. TIME WEIGHTING (FAST &
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
22
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