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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.

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

Prepolarized Pressure-field 1/2-inch Microphone - Type 4947

Data Sheets

English

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

CALIBRAÇÃO

A sensibilidade pode ser calibrada a 250 Hz usando o Pistonphone Tipo 4228 com adaptador de ½ polegada DP 0776. A resposta do atuador pode ser medida usando o Atuador Eletrostático UA 0033.

A resposta do campo de pressão pode ser obtida adicionando a curva de correcção relevante à resposta do actuador.

Relacionados

Tipo 4228 - Pistonphone

DP-0776 - Adaptador de Calibração 1/2"

UA-0033 - Atuador Electrostático 1/2"

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