Microphone & PreAmplifier Combinations

Type 4182  Probe Microphone, 1 HZ TO 20 KHZ, 200 V Polarization

Type 4182 Probe Microphone, 1 HZ TO 20 KHZ, 200 V Polarization

Type 4182 is designed for sound pressure measurements to be made in small or awkward places or in harsh environments where a conventional microphone would be unsuitable. The probe microphone has a smooth frequency response from 1Hz to 20kHz, with a very smooth high-frequency roll-off.


  • Near-field measurement of loudspeakers
  • Investigation of sound distribution inside:
  • Telephone equipment
  • Hi-Fi headphones
  • Musical instruments
  • Measurement of noise radiation from intricate machinery
  • Measurement of attenuation in hearing protectors
  • Acoustic impedance measurements

Physically, it is very small and lightweight and has a durable construction. Measurements can be performed extremely close to the sound source due to its small size. Measurement points can be closely spaced when it is necessary to have high spatial resolution.

The high impedance of the narrow probe tip enables measurements in very small volumes – as small as 1cm3 with only minor effects due to acoustic loading. Interchangeable stiff and flexible probe tubes, of various lengths, make the probe microphone very adaptable for measurements in awkward places (for safety reasons Probe Microphone Type 4182 is not suitable for measurements on the human body).

The static pressure inside the probe microphone can be equalised to that of the measurement site.


Capacitance: pF

Diameter: Probe (0.05″)

Dynamic range: 42 – 164 dB

Frequency range: 1 – 20000 Hz

Inherent noise: 42 dB A

Lower limiting frequency -3dB: Hz

Optimised: Probe

Polarization: Ext polarized

Polarization voltages: 200 V

Pressure coefficient: -0.007 dB/kPa

Sensitivity: 3.16 mV/Pa

Temperature coefficient: -0.005 db/ºC

Temperature range: -10 – 700 C

Venting: Selected

Weight: gram

Sound field: Special

Input type: Classic

Microphone type: Probe