Rough and stable measurement special microphone 4948 type surfaces Microphone
Hottinger Brüel & Kjær
About This Product
■ Overview
Type 4948 Surface Micro Hon is a robust and stable micro -hon designed to be measured on the surface of the aircraft during the application such as infrastructure testing and wind tunnel tests. All of the microphone housing and the diaphragm -back plate structure are made of titanium to have excellent rotation resistance.
The 4948 -type surface microphone has a built -in deltatron preamplifier to connect to CCLD (constant current line drive method) input. The sensitivity of the microphone is adjusted so that it can be measured without distortion at a high level. All 4948 type supports Teds (Transducer Electronic Data Sheet). TEDS can remotely read transduca recognition and proofreading data.
The 4948 -type microphones can be placed on the same side of the microphone housing (flash mount), so that the mixture of the microphones can be minimized to provide excellent flexibility in the mounting method. The sound pressure adjustment vent of this microphone is made near the diaphragm in front of the microphone. This is important for the design of the microphone when the static pressure changes rapidly at the applicable position.
Type 4948 Micro Hon is the first product based on the new microphone manufacturing technology. With this technology, the 4948 -type flat and compact design can obtain very stable and homogeneous characteristics, as well as traditional and well -known microphones and preamplifiers.
■ Use
・ Sound pressure measurement of the surface
・ Airlines' acoustic fatigue test
・ Measurement of wind tunnel
・ Middle / treble pressure level measurement
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Product
Rough and stable measurement special microphone 4948 type surfaces Microphone
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Handling Company
Hottinger Brüel & Kjær
2 Models of Rough and stable measurement special microphone 4948 type 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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4948 |
Available upon quote | --0.007db/KPA | 12.7V ± 1.3V | 165 DB Re 20 µPa Peak (7 V Peak maximum sensitivity) | Deltatron Supply 2 MA ~ 20 MA, Nominal 4 MA | 0.00db | 24kHz, representative value (90 ° phase shift) | 6.8mm^3 ± 0.8mm^3 (2σ) | 20 ° C, 50%or less, less than 0.001 dB/year, 20 ° C, 90%or less, 0.025 dB/year, 100 ° C, less than 0.5db/month in dry air | 10Hz to 10kHz ± 1db Re 250Hz, 5Hz to 20kHz ± 3db Re 250Hz | 0.1db less condensed | 1 Hz to 5 Hz | Less than 160 DB SPL (500 Hz, 3%distortion) | 1 mA or less of peak value supply current | > 7v Peak | 20mm (0.79 ″) | 2.5mm (0.1 ") | 2.3 Gramms | --55 to +100 ° C (–67 to +212 ° f) | 0 ~ 100% RH dew condensation | <50Ω 1kHz, 22Ω 430PF representative value | Front vent (diaphragm end) | 30 µV or less, linear 22.4 Hz ~ 22.4 kHz | --57 DB ± 3 DB RE 1 V/PA, 1.4 MV/PA | –30 to +70 ° C (--22 to +158 ° f) | + 22V to + 30V DC, minimum 18V for limited specifications | + 0.013db/℃ | A typical example of 1 m/s^2 o'clock 65 db, etc. | 1.4 MV/PA |
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4948-B |
Available upon quote | --0.007db/KPA | 12.7V ± 1.3V | 165 DB Re 20 µPa Peak (7 V Peak maximum sensitivity) | Deltatron Supply 2 MA ~ 20 MA, Nominal 4 MA | 0.00db | 24kHz, representative value (90 ° phase shift) | 6.8mm^3 ± 0.8mm^3 (2σ) | 20 ° C, 50%or less, less than 0.001 dB/year, 20 ° C, 90%or less, 0.025 dB/year, 100 ° C, less than 0.5db/month in dry air | 10Hz to 10kHz ± 1db Re 250Hz, 5Hz to 20kHz ± 3db Re 250Hz | 0.1db less condensed | 1 Hz to 5 Hz | Less than 160 DB SPL (500 Hz, 3%distortion) | 1 mA or less of peak value supply current | > 7v Peak | 20mm (0.79 ″) | 2.5mm (0.1 ") | 2.3 Gramms | --55 to +100 ° C (–67 to +212 ° f) | 0 ~ 100% RH dew condensation | <50Ω 1kHz, 22Ω 430PF representative value | Front vent (diaphragm end) | 30 µV or less, linear 22.4 Hz ~ 22.4 kHz | --57 DB ± 3 DB RE 1 V/PA, 1.4 MV/PA | –30 to +70 ° C (--22 to +158 ° f) | + 22V to + 30V DC, minimum 18V for limited specifications | + 0.013db/℃ | A typical example of 1 m/s^2 o'clock 65 db, etc. | 1.4 MV/PA |
Click on the part number for more information about each product
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