3M SE-401 - Page 73

Data Addendum
Sound Examiner SE-400 Series
66
Pressure to free field corrections with QE7052 microphone with windscreen (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
QE7052 microphone
Pressure Field to
Free Field
Corrections
in dB
32
0.1
40
-0.1
50
0.0
63
-0.1
80
-0.2
100
-0.3
125
-0.3
160
-0.3
200
-0.3
250
-0.2
315
-0.1
400
-0.1
500
-0.1
630
0.0
800
0.0
1000
0.0
1250
0.2
1600
0.3
2000
0.5
2500
0.8
3150
0.9
4000
1.5
5000
2.3
6300
4.3
8000
4.7
10000
3.9
12500
5.2
16000
7.2