Uses
- Noise measurement on surfaces including glass and in confined spaces
- Wind-tunnel testing
- Low to medium noise measurements
- Flush mounting
- Connects to CCLD/DeltaTron® input
| Features
- Sensitivity: 11.2 mV/Pa
- Frequency: 5 to 20000 Hz
- Dynamic Range: 30 – 140 dB
- Temperature: – 30 to 100˚C (– 22 to 212˚F)
- Optimised for surface pressure measurement
- Built-in DeltaTron preamplifier
- Simple mechanical interface
- Mounting pads and protection grid available
- TEDS – IEEE P1451.4
- CIC verification input (Type 4949 B)
- Patent pending
- PULSE™ template available for pressure mapping
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The diaphragm is flush with the microphone housing in order to minimise 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 DeltaTron preamplifier for connection to CCLD inputs. The sensitivity of the microphone is optimised 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 microphones and preamplifiers.
For a full Description and Specifications, see
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