BRUEL & KJAER 4188 - Frequency Response

Chapter 2 — Prepolarized Free-field
1
/
2
" Microphone Type 4188
Frequency Response
Falcon™ Range of Microphone Products
Microphone Handbook
Brüel & Kjær
2
−
6
This section shows the microphone’s typical free-field and random-incidence re-
sponses together with the microphone’s typical actuator response obtained using
Electrostatic Actuator UA0033. The low-frequency response described in section
2.3.4 is common for all types of response.
All frequency responses and correction curves are shown with a frequency resolu-
tion of
1
/
12
-octave.
2.3.2 Optimized Response (0
°
-incidence Free-field Response)
Prepolarized Free-field
1
/
2
" Microphone Type 4188 meets the requirements of IEC
651, Type 1 and ANSI S1.4 – 1983 Type 1.
2.3.3 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.2.3 Typical free-field response of the microphone with Protection Grid DD0525 and the micro-
phone’s specified tolerances. The low-frequency response is valid when the vent is exposed to
the sound field
5
dB
0
– 5
– 10
1 10 100 1k 10 k
Frequency (Hz)
100 k
940894e
Tol.
Tol.
Tol.
Tol.
Response (dB)