52
SW-BA-e-2020
7.4 Typical frequency response and corresponding upper limit
Each microphone has been carefully tested at the factory before delivery. The
calibration diagram in the enclosed box shows the real frequency response of the
electret microphone and the frequency response in free field.
The typical frequency response with frequency weighting of the sound level meter is
shown in the following figure. The typical frequency response as well as the frequency
response of the microphone in the free field can be considered as the overall
characteristic of the sound level meter in the free field. The calibration certificate also
contains the test results of the frequency response with A, C and Z weighting.
The following table shows the influence of the upper limit of the measuring range with
A, B and C weighting and a typical frequency response as shown in the figure:
Freq. [Hz]
31,5
63
125
250
500
1 k
2 k
4 k
8 k 16 k*
A-weighting [dB]
-39,5 -26,2 -16,2 -8,7
-3,3
0,0
+1,3 +1,2 -0,5
-9,7
B-weighting [dB]
-17,1 -9,4
-4,3
-1,4
-0,3
0,0
0,0
-0,5
-2,3 -11,6
C-weighting [dB]
-3,0
-0,8
-0,2
0,0
0,0
0,0
-0,1
-0,6
-2,4 -11,7
Note *: Only available for SW 1000.
-80,0
-70,0
-60,0
-50,0
-40,0
-30,0
-20,0
-10,0
0,0
10,0
10
100
1000
10000
Typical Frequency response of the Schallpegelmessgeräts with
frequency weighting
A-weighting
B-weighting
C-weighting
dB
Hz