Ideal for precision surface sound pressure measurement 4949 type automotive surfaces Microphone
Hottinger Brüel & Kjær
About This Product
Type 4949 -type surface microphone is ideal for precision surface sound pressure and is particularly suitable for car applications. Since the 4949 type can be installed directly on the body surface of the car, it is ideal for measurement in a wind tunnel test or in a narrow space such as a car firewall or bottom.
■ Usage examples
・ Measurement of noise on the glass surface and narrow space
・ Wind tunnel test
・ Low to medium sound pressure level of noise measurement
・ Flash mount (composition of the surface)
・ Connect to CCLD input
By using the optional mount pad, you can easily attach a microphone when the body surface is curved. Although small, the 4949 type is a durable and stable micro hone. All metal parts, including microphone housing, diaphragm and back plate, are made of titanium, ensuring very high corrosion resistance.
To minimize the wind noise of the microphone itself, the diaphragm is located on the same side as the microphone housing. The static equalization vent is located right next to the diaphragm on the front of the microphone. This arrangement is important because the micro hon is exposed to the turbulent pressure fluctuation.
The 4949 -type surface microphone has a built -in Deltat loan team to connect to CCLD input. The sensitivity of the microphone is optimized to ensure a good noise floor and measure high sound pressure levels without clipping. Micro hons are compatible with IEEE 1451.4 (TEDS), recognizing microphones from afar and can read the proofreading sensitivity.
The 4949 type surface microphones are based on the new microphone technology. With this technology, you can get uniform and high stability like microphones and preamplifiers.
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Product
Ideal for precision surface sound pressure measurement 4949 type automotive surfaces Microphone
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Handling Company
Hottinger Brüel & Kjær
2 Models of Ideal for precision surface sound pressure measurement 4949 type automotive surfaces Microphone
Items marked with have different values depending on the model number.
Click on the part number for more information about each product
| Product Image | Part Number | Price (excluding tax) | Atmospheric pressure coefficient (250Hz) | Bias voltage | Clipping limit | Constant current supply | Correction by Type 4228 with DP 0977 or DP 0979 | Diacphram co -amal frequency number | Equivalent air volume | Estimated long -term stability | Frequency response (sound pressure sound field) | Humidity impact | Lower frequency (–3db) | Maximum operating range | Maximum output current | Maximum output voltage | Micro hon unit diameter | Micro hon unit height | Microphone unit weight | Operating temperature range | Operation humidity range | Output impedance | Pressure adjustment vent | Self -noise | Sensitivity (250Hz) | Storage temperature | Supply voltage (when no load) | Temperature coefficient (250Hz) | Vibration sensitivity (<2kHz) | sensitivity |
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4949 |
Available upon quote | --0.007db/KPA | 12.7V ± 1.3V | > 144db Re 20 µPa Peak (7V Peak maximum sensitivity) | Deltatron power supply 2MA to 20ma, nominal 4MA | 0.00db | 24kHz, representative value (90 ° phase shift) | 6.8mm^3 ± 0.8mm^3 (2σ) | <0.001db/20 ° C: <50% RH, <0.025dB/20 ° C: <90% RH, <0.5b/month 100 ° C | 10Hz to 10kHz ± 1db Re 250Hz, 5Hz to 20kHz ± 3db Re 250Hz | <0.1db No condensation | 0.5 Hz to 5 Hz | > 140db SPL (500Hz, 3%distortion) | 1 mA or less of peak value supply current | > 7v Peak | 20mm (0.79 ″) | 2.5mm (0.1 ") | 2.3g (0.08 Oz.) Not included cable | –30 to +100 ° C (--22 to +212 ° f) | 0 ~ 100% RH dew condensation | <50Ω 1kHz, 22Ω 430PF representative value | Front vent (diaphragm end) | <9 µV, linear 22.4Hz ~ 22.4kHz, representative value: 6 µV, A characteristics, equivalent conversion SPL 8.9 µV, Linear 22.4Hz ~ 22.4kHz, 32dB public sensitivity equivalent SPL | --39 DB ± 3 DB RE 1 V/PA, 11.2 MV/PA | –30 to +70 ° C (--22 to +158 ° f) | + 22V to + 30V DC, minimum 18V for limited specifications | + 0.013db/℃ | 1m/s^2:65 DB, etc. | 11.2 MV/PA |
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4949-b |
Available upon quote | --0.007db/KPA | 12.7V ± 1.3V | > 144db Re 20 µPa Peak (7V Peak maximum sensitivity) | Deltatron power supply 2MA to 20ma, nominal 4MA | 0.00db | 24kHz, representative value (90 ° phase shift) | 6.8mm^3 ± 0.8mm^3 (2σ) | <0.001db/20 ° C: <50% RH, <0.025dB/20 ° C: <90% RH, <0.5b/month 100 ° C | 10Hz to 10kHz ± 1db Re 250Hz, 5Hz to 20kHz ± 3db Re 250Hz | <0.1db No condensation | 0.5Hz to 5Hz | > 140db SPL (500Hz, 3%distortion) | 1 mA or less of peak value supply current | > 7v Peak | 20mm (0.79 ″) | 2.5mm (0.1 ") | 2.3g (0.08 Oz.) Not included cable | –30 to +100 ° C (--22 to +212 ° f) | 0 ~ 100% RH dew condensation | <50Ω 1kHz, 22Ω 430PF representative value | Front vent (diaphragm end) | <9 µV, linear 22.4Hz ~ 22.4kHz, representative value: 6 µV, A characteristics, equivalent conversion SPL 8.9 µV, Linear 22.4Hz ~ 22.4kHz, 32dB public sensitivity equivalent SPL | --39 DB ± 3 DB RE 1 V/PA, 11.2 MV/PA | –30 to +70 ° C (--22 to +158 ° f) | + 22V to + 30V DC, minimum 18V for limited specifications | + 0.013db/℃ | 1m/s^2:65 DB, etc. | 11.2 MV/PA |
Click on the part number for more information about each product
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