Type 4184

Weatherproof omnidirectional microphone

Designed for use in permanent, semi-permanent or portable noise-monitoring systems.

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Designed for use in permanent, semi-permanent or portable noise-monitoring systems.

USE SCENARIOS

  • Permanent noise-monitoring systems
  • Semi-permanent noise-monitoring systems
  • Portable noise-monitoring systems
  • Noise measurements in most humid and corrosive atmospheres
The middle section contains the microphone, the preamplifier, the impedance matching tubes, the circuit board comprising a filter and cable driver, the built-in test sound source and its transmission tube.

The impedance matching tube system comprises four tubes of specific lengths. The test sound source consists of two miniature loudspeakers and a transmission tube which feeds the signal to a point below the mouth of the probe tube. Weatherproof Microphone Unit Type 4184 is for use in permanent, semi-permanent or portable noise-monitoring systems.

The unit can be used in most humid and corrosive atmospheres as the casing is made completely of stainless steel and it has a built-in protection system against humidity. Type 4184 complies with standards IEC 651 Type 1 and ANSI S 1.4-1983 Type 1.

The greatest attribute of Type 4184 is its excellent omnidirectional characteristics. It is fully rotational about its vertical axis without any undesirable reflections from its casing affecting the noise measurements being undertaken.

Type 4184 is based on a probe tube system which has allowed the microphone cartridge to be installed within the casing of the unit itself. This ensures that the microphone is afforded rain protection according to Standard IEC 529 IP44.

Each Type 4184 is individually calibrated and is delivered with a calibration chart giving the frequency responses.
Capacitance
pF
Diameter
Probe (0.3")
Dynamic range
27 – 140 dB
Frequency range
20 – 20000 Hz
Inherent noise
27 dB A
Lower limiting frequency -3dB
4 Hz
Optimised
Outdoor
Polarization
Ext polarized
Polarization voltages
200 V
Pressure coefficient
-0.006 dB/kPa
Sensitivity
12.5 mV/Pa
Temperature coefficient
-0.005 db/ºC
Temperature range
-10 – 50 C
Venting
Yes
Weight
gram
Sound field
Special
Input type
Classic
Microphone type
Outdoor