BRUEL & KJAER 4188 - Page 52

Chapter 3 — Prepolarized Free-field
1
/
2
" Microphone Type 4189
Frequency Response
Falcon™ Range of Microphone Products
Microphone Handbook
BE1375– 12
3
−
7
All frequency responses and correction curves are shown with a frequency resolu-
tion of
1
/
12
-octave.
3.3.2 Optimized Response (0
°
-incidence Free-field Response)
The frequency response of Prepolarized Free-field
1
/
2
" Microphone Type 4189 meets
the requirements of IEC651 Type 1.
3.3.3 Actuator Response
The microphone’s frequency response is determined by adding corrections for the
type of sound field to its actuator response obtained using Electrostatic Actuator
Fig.3.3 Typical free-field response of the microphone with Protection Grid DB3420 and the micro-
phone’s specified tolerances. The low-frequency response is valid when the vent is exposed to
the sound field
5
0
– 5
– 10
1 10 100 1k 10 k
Frequency (Hz)
100 k
940896e
Tol.
Tol.
Tol.
Tol.
Response (dB)