¼" Free-field microphone Type 40BF - High-level

 
The Type 40BF is a ¼" microphone for high level and high frequency measurements. Its low sensitivity makes it ideal for measuring very high sound pressure levels; up to 174 dB re. 20µPa. Its small size reduces disturbances in the sound field; resulting in a frequency range reaching up to 100 kHz.

Can be used with  ¼" Preamplifier Types 26AC and 26TC

The following applies only to ¼" microphones
For most applications, rear venting is more advantageous particularly where phase response is critical. However, if front venting is preferred, please add "front venting" to the Type number of the microphone when ordering.

Download PDF Data Sheet: pd_40BF_ver_10_12_03.PDF
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Specifications Type 40BF
Sensitivity

4 mV/Pa

Frequency range

10 Hz - 100 kHz

Dynamic range

40 dB - 174 dB re. 20µPa

Polarisation voltage

200 V

Outside diameter (with protection grid)

6.9 mm

Length (with and

10.5 mm

without protection grid)

9.1 mm

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Array Microphone Type 40PR
Array Microphone Type 40PQ
Environmental Microphone Type 41AL
¼" Free-field microphone Type 40BF - High-level
½" Free-field microphone Type 40AC - Wide-frequency
½" Free-field microphone Type 40AE - Prepolarised
½" Free-field microphone Type 40AF - High-sensitivity
½" Free-field microphone Type 40AN - Low-frequency
¼" Free-field microphone Type 40BE - Prepolarised, High-level
1" Low-noise Level Microphone System - Type 40HF
¼" Preamplifiers 26AA, AB, AC, AL, AN and TC - Type 26A+ Series
¼" CCP Preamplifier - Type 26CB
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Constant voltage
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Outdoor Microphone for 0° incidence - Type 41AM
Outdoor Microphone for 90° incidence - Type 41CN
¼" Pressure microphone Type 40BD - Prepolarised, High-level
¼" Pressure microphone Type 40BP - High level
¼" Pressure microphone Type 40BH - Very high level
½" Pressure microphone Type 40AD - Prepolarised
½" Pressure microphone Type 40AG - High frequency
½" Pressure microphone Type 40AP - High sensitivity
½" Pressure microphone Type 40AO - Prepolarised, Wide frequency
1" Pressure microphone Type 40EN
1/8" Pressure microphone Type 40DP, High level, High frequency
CCP Probe microphone Type 40SC
Probe microphone Type 40SA
½" Random-incidence microphone - Type 40AR
½" Random-incidence microphone Type 40AQ - Prepolarised
Intensity-microphone calibrator Type 51AB
¼" Intensity-microphone pair Type 40BI
½" Sound-intensity microphone pairs Type 40AI/40AK
X-Y-Z Intensity probe Type 50VX
Sound calibrator Type 42AB
Actuator supply Type 14AA
Pistonphone Type 42AA
Pistonphone Type 42AD
Pistonphone Type 42AC
Artificial ear Type 43AD
NBS 9-A coupler RA0075
IEC 318 ear simulator RA0039
IEC 711 ear simulator RA0045
Mouth simulator Type 44AA
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Acoustic transducer Type 21SB
Acoustic transducer Type 21SP
Input module Type AC0014
Hydrophone Type 10CA
Hydrophone Type 10CT
Hydrophone Type 10CC
Hydrophone Type 10CD
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½" Pressure microphone Type 40AU - Laboratory standard
½" Low-noise Level Microphone System - Type 40HH
1" Pressure microphone Type 40EU - Laboratory standard
Technical notes
TEDS - plug and play
¼" TEDS microphones