3M SE-401 - Page 68

Data Addendum
Sound Examiner SE-400 Series
61
Pressure to free field corrections with BK4936 microphone and remote preamp (sections: 5.2.8, 9.2.7d)
Note: add to pressure response to get 0⁰incidence free-field response. B&K 4226 calibrator may be used to determine the
pressure field response.
Frequency
in Hz
BK4936 microphone
Pressure Field to
Free Field
Corrections
in dB
32
0.1
40
0.0
50
-0.1
63
-0.1
80
-0.1
100
-0.1
125
-0.1
160
-0.1
200
-0.2
250
-0.1
315
0.0
400
0.0
500
0.1
630
0.1
800
0.0
1000
0.0
1250
0.2
1600
0.1
2000
0.2
2500
0.6
3150
0.9
4000
1.3
5000
2.1
6300
2.7
8000
3.3
10000
4.8
12500
6.4
16000
8.4