BRUEL & KJAER 4188 - Page 95

Chapter 4 — Free-field
1
/
2
" Microphone Type 4190
Polarization Voltage
Falcon™ Range of Microphone Products
Microphone Handbook
Brüel & Kjær
4
−
20
Fig.4.20 Variation in sensitivity (at 250Hz) as a function of po-
larization voltage, relative to the sensitivity with a polar-
ization voltage of 200V
Fig.4.21 Effect of polarization voltage on frequency response. The curves show the difference from
the response with a polarization voltage of 200V (normalised at 250Hz)
10 20 50 100 200 500
Po. Voltage (V)
–25
–20
–10
0
5
Response (dB)
940681e
5
–15
–5
100 1k 10k 100kHz
-2
-1
0
1
2
Response (dB)
940606e
28 V
150 V
250 V
2.5
-2.5
Frequency (Hz)