½-INCH PRESSURE-FIELD MICROPHONE, PREPOLARIZED, 8 HZ – 10 KHZ
Pressure-field microphone designed for coupler measurements in connection with telephone and hearing aid testing over a frequency range of 8 Hz To 10 kHz.
TYPE 4947
Prepolarized ½-inch Microphone Type 4947 is optimised for pressure-field measurements such as coupler measurements, close to hard reflective surfaces, in enclosures or cavities that are small compared to the wavelength.
For example, in connection with telephone and hearing aid testing. The microphone is prepolarized, which enables connection to CCLD input conditioning. The microphone is capable of withstanding the IEC 68-2-32 1 meter drop test.
| Prepolarized Pressure-field 1/2-inch Microphone - Type 4947 | Data Sheets | English |
| Sound field | Pressure field |
| Polarization voltage | 200V |
| Sensitivity | 50 mV/Pa |
| Lower limiting frequency | 8 Hz |
| Higher limiting frequency | 10 kHz |
| Inherent noise | 15.5 dB(A) |
| Upper limiting of dynamic range | 148 dB |
| Diameter | 1/2 inch |
| Venting | Rear |
| Minimum Temperature | -40 °C |
| Maximum Temperature | 150 °C |
| Minimum Temperature | -40 °F |
| Maximum Temperature | 302 °F |
The sensitivity can be calibrated at 250 Hz by using Pistonphone Type 4228 with ½-inch Adaptor DP 0776. The actuator response can be measured using Electrostatic Actuator UA 0033.
The pressure-field response can be obtained by adding the relevant correction curve to the actuator response.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
This will bring together HBM, Brüel & Kjær, nCode, ReliaSoft, MicroStrain and Discom brands, helping you innovate faster for a cleaner, healthier, and more productive world.
