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TYPE 4939

1/4" FREE-FIELD MICROPHONE, EXTERNAL POLARIZED

Free-field microphone designed for high-level and high-frequency measurements over a frequency range of 4 Hz to 100 kHz.

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TYPE 4939

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Using stainless steel diaphragm and protection grid, Type 4939 Microphone is built to withstand rough environments and can be used in high-temperature measurements up to 150°C (302°F). 

The microphone requires an external polarization voltage and must therefore be used with a classical preamplifier. Externally polarized microphones can be used at higher temperatures without severe changes in measurement sensitivity. 

  • High-level measurements
  • High-frequency measurements
  • Model work
TYPE 4939
Standard IEC 61094
Sound field Free field
Polarization voltage 200V
Sensitivity 4 mV/Pa
Lower limiting frequency 4 Hz
Higher limiting frequency 100 kHz
Inherent noise 28 dB(A)
Upper limiting of dynamic range 164 dB
Diameter 1/2 inch
Venting Side
Minimum Temperature -40 °C
Maximum Temperature 150 °C
Minimum Temperature -40 °F
Maximum Temperature 302 °F