BRUEL & KJAER 4188 - Page 12

Chapter 1 — Introduction
The Microphones
Falcon™ Range of Microphone Products
Microphone Handbook
BE1372– 12
1
−
5
Specification Type 4188 Type 4189 Type 4190 Type 4191 Type 4192 Type 4193
Description
Prepolarized Free-
field
Prepolarized Free-
field
Low Noise
Free-field
Free-field Pressure-field
Infrasound,
Pressure-field
Nominal
Open-circuit
Sensitivity
31.6 mV/Pa 50 mV/Pa 50 mV/Pa 12.5 mV/Pa 12.5 mV/Pa 12.5 mV/Pa
Polarization
Voltage
0 0 200 200 200 200
Optimized
Frequency
Response
±1dB:
12.5Hz to 8kHz
±2dB:
8 Hz to 12.5 kHz
±1dB:
10Hz to 8kHz
±2dB:
6.3 Hz to 20 kHz
±1dB:
5Hz to 10 kHz
±2dB:
3.15Hz to 20kHz
±1dB:
5Hz to 16kHz
±2dB:
3.15 Hz to 40 kHz
±1dB:
5 Hz to 12.5 kHz
±2dB:
3.15Hz to 20kHz
±1dB:
0.12Hz to12.5 kHz
±2dB:
0.07Hz to 20kHz
Main
Standards
IEC 651 Type 1,
ANSI S1.4 1983
IEC 651 Type 1
IEC 651 Type 0
and Type 1
IEC 651 Type 0
and Type 1, ANSI
S1.12 Type M
ANSI S1.4 Type 1,
ANSI S1.12 Type
M
ANSI S1.4 Type 1,
ANSI S1.12 Type
M
Lower Limiting
Freq. (–3 dB)
1 to 5Hz 2 to 4Hz 1 to 2Hz 1 to 2Hz 1 to 2Hz 10 to 50mHz
Diaphragm
Resonance
Frequency
9kHz 14kHz 14kHz 34kHz 23kHz 23kHz
Inherent Noise
14.2 dB (A)
14.5 dB(Lin)
14.6 dB (A)
15.3dB(Lin)
14.5dB(A)
15.5dB(Lin)
20.0 dB(A)
21.4 dB(Lin)
19.0 dB (A)
21.3dB(Lin)
19.0 dB (A)
21.3dB(Lin)
3% Distortion
Limit
146dB 146dB 148dB 162 dB 162dB 162dB
Maximum SPL
(Peak)
157dB 158dB 159dB 171 dB 171dB 171dB
Nominal
Capacitance
12pF 14pF 16pF 18pF 18pF 18pF
Equivalent
Volume
65 mm
3
46 mm
3
46mm
3
11.6 mm
3
8.8 mm
3
8.8 mm
3
Calibrator Load
Volume
208 mm
3
260mm
3
250mm
3
190 mm
3
190mm
3
190mm
3
Pistonphone
4228 Correction
(with DP 0776)
+0.02 dB 0.00 dB 0.00 dB +0.02 dB +0.02 dB +0.02 dB
Operating
Temperature
Range
–30 to 125°C
(–22 to 257°F)
(up to 70°C with
corrector)
–30 to 150 °C
(–22 to 302°F)
–30 to 150°C (–22 to 302°F)
(can be used up to +300°×C (572 °F) but with a permanent sensitivity change
of typically +0.4 dB which stabilises after one hour)
Temperature
Coefficient
+0.005 dB/ °C –0.001dB/°C–0.007dB/°C –0.002 dB/ °C –0.002dB/°C–0.002dB/°C
Pressure
Coefficient
–0.021dB/kPa –0.010dB/kPa –0.010dB/kPa –0.007dB/kPa –0.005dB/kPa –0.005dB/kPa
Operating
Humidity Range
0 to 100%RH (without condensation)
Effect of
Humidity
<0.1dB/100%RH
Effect of
Vibration (SPL
with axial 1m/s
2
)
63.5 dB 62.5 dB 62.5 dB 65.5 dB 65.5 dB 65.5 dB
Effect of
Magnetic Field
(SPL with 80 A /m,
50 Hz field)
7dB 6dB 4dB 16dB 16dB 16dB
Table 1.2 Comparision of main specifications for the different microphones in the Falcon™ Range