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TYPE 4947

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.

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TYPE 4947

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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.

  • Coupler measurements
  • Hearing aid testing
  • Telephone testing
  • Connect to CCLD input
  • High-humidity environments
TYPE 4947
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

CALIBRAGE

La sensibilité peut être calibrée à 250 Hz à l'aide d'un Pistonphone Type 4228 avec adaptateur ¼ pouce DP-0776. La réponse de l’actionneur peut être mesurée à l’aide de l’actionneur électrostatique UA 0033.

La réponse pression-champ peut être obtenue en ajoutant la courbe de correction correspondante à la réponse de l’actionneur.

Associés