0,00
1,00
2,00
3,00
4,00
5,00
6,00
7,00
8,00
9,00
10,00
100
1000
10000
100000
f[Hz]
dL[dB]
Fig. 1.3. Free-field correction for WK-21 microphone (0° incidence).
Table below and Fig. 1.4 show typical free-field frequency response of WK-21 microphone
(relative to its sensitivity at 250Hz) together with maximum permissible deviations as specified
in EN 61094-4:1995.
f [Hz]
250
315
400
500
630
800
1000
1250
1600
2000
2240
dL [dB]
0.00
-0.07
-0.02
0.00
0.02
-0.05
0.02
-0.01
-0.08
0.04
-0.02
U [dB]
≤
0.21
f [Hz]
2500
2800
3150
3550
4000
4500
5000
5600
6300
7100
8000
dL [dB]
0.07
0.06
-0.15
0.06
-0.13
0.11
-0.05
-0.05
0.20
0.31
0.38
U [dB]
≤
0.21
≤
0.34
f [Hz]
8500
9000
9500 10000 10600 11200 11800 12500 13200 14000 15000
dL [dB]
-0.46
0.03
-0.50
-0.66
-0.23
-0.42
-0.83
-0.33
-0.20
-0.21
0.08
U [dB]
≤
0.34
≤
0.44
f [Hz]
16000 17000 18000 19000 20000
dL [dB]
0.02
-0.09
-0.08
-0.21
-0.46
U [dB]
≤
0.44
