TYPE 4949

Code	名前
-4949---	1/2" 0V Mic, Automotive Surface
-4949-B--	1/2" 0V Mic, Automotive, 2 Coax Cables
-4949-W-003-	1/2" 0V Mic,Automotive,Reinf.of 10-32UNF
-4949-W-004-	1/2" 0V Mic,Automotive, Rubber Fairing
-4949-W-007-	Microphone, Automotive Surface, with 0,5

Code

名前

-4949---

1/2" 0V Mic, Automotive Surface

-4949-B--

1/2" 0V Mic, Automotive, 2 Coax Cables

-4949-W-003-

1/2" 0V Mic,Automotive,Reinf.of 10-32UNF

-4949-W-004-

1/2" 0V Mic,Automotive, Rubber Fairing

-4949-W-007-

Microphone, Automotive Surface, with 0,5

TYPE 4949
Sound field	Pressure field
Polarization	CCLD
Sensitivity	11.2 mV/Pa
Lower frequency	5 Hz
Higher frequency	20000 Hz
Lower dynamic range	30 dB
Higher dynamic range	140 dB
Diameter	1/2 inch
Venting	Front
Minimum Temperature	-30 °C
Maximum Temperature	100 °C
Minimum Temperature	-22 °F
Maximum Temperature	212 °F
Output signal (connectivity)	Passive

TYPE 4949

Sound field

Pressure field

Polarization

CCLD

Sensitivity

11.2 mV/Pa

Lower frequency

5 Hz

Higher frequency

20000 Hz

Lower dynamic range

30 dB

Higher dynamic range

140 dB

Diameter

1/2 inch

Venting

Front

Minimum Temperature

-30 °C

Maximum Temperature

100 °C

Minimum Temperature

-22 °F

Maximum Temperature

212 °F

Output signal (connectivity)

Passive

Type 4949 is a "car microphone" designed for measuring the true surface pressure in automotive applications. The microphone is exceptionally suited for mounting directly on the car surface during wind-tunnel tests or for measurement in confined spaces; for example, on the firewall or the underside of a vehicle.

USE SCENARIOS

Noise measurement on surfaces including glass and in confined spaces
Wind-tunnel testing
Low to medium noise measurements
Flush mounting
Connects to CCLD input

The optional mounting pads allow easy mounting of the microphone even on the curved surfaces of a car. Despite its small size, Type 4949 is a rugged and stable measurement microphone. The microphone housing and the metallic parts of the diaphragm-backplate arrangement, including the diaphragm, are all titanium, ensuring uniquely high resistance to corrosion.

The diaphragm is flush with the microphone housing in order to minimize the wind-generated noise of the microphone. The microphone pressure-equalization vent is placed just next to the diaphragm on the front of the microphone. This is important since the static pressure can vary rapidly with position when the microphone is exposed to turbulent pressure fluctuations.

Surface Microphone Type 4949 has a built-in preamplifier for connection to CCLD inputs. The sensitivity of the microphone is optimized in order to achieve a good noise floor and still allow measurements at higher levels without clipping.

The microphone supports IEEE 1451.4 (TEDS) for remote identification of the transducer and reading of its calibrated sensitivity. Type 4949 B also supports Brüel & Kjær’s proprietary Charge Injection Calibration (CIC) for remote verification of the complete, calibrated measurement channel.

Surface Microphone Type 4949 is yet another product based on Brüel & Kjær’s new patent-pending microphone technology.

With this technology, it is possible to obtain the same high
stability and uniformity as that of the traditional and well-known Brüel & Kjær measurement microphones

Automotive Surface Microphones Types 4949 and 4949B	Data Sheets	Japanese
Automotive Surface Microphones Types 4949 and 4949B	Data Sheets	English

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TYPE 4949

USE SCENARIOS