TYPE 4947

½-inch pressure-field microphone, 8 Hz to 10 kHz, prepolarized

Designed for coupler measurements in connection with telephone and hearing aid testing.

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Prepolarized Pressure-field 1/2-inch Microphone Type 4947 is optimised for coupler measurements, for example, in connection with telephone and hearing aid testing. It is prepolarized, which enables connection to CCLD input conditioning.

USE SCENARIOS

  • Coupler measurements
  • Hearing aid testing
  • Telephone testing
  • Connect to CCLD input
  • High-humidity environments
  • Pressure fields can be found close to hard reflective surfaces, in enclosures or cavities that are small compared to the wavelength, in for example couplers for testing of earphones or calibration of microphones, or in sound level calibrator and in pistonphones. 

ROBUSTNESS

The microphone is capable of withstanding the IEC 68-2-32 1 meter drop test. 

CALIBRATION OF SENSITIVITY AND FREQUENCY RESPONDSE

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 Actuator UA 0033. The pressure-field response can be obtained by adding the relevant correction curve to the actuator response.

Capacitance
14 pF
Diameter
1/2
Dynamic range
17.5 – 160 dB
Frequency range
8 – 10000 Hz
Inherent noise
17.5 dB A
Lower limiting frequency -3dB
5 Hz
Optimised
Pressure Field
Polarization
Prepolarized
Polarization voltages
V
Pressure coefficient
-0.006 dB/kPa
Sensitivity
12.5 mV/Pa
Temperature coefficient
0.006 db/ºC
Temperature range
-30 – 125 C
Venting
Rear
Weight
gram
Sound field
Pressure-field
Microphone type
Pressure Field