Weatherproof Microphone Type 4184 is the ideal choice for conducting long-term outdoor noise monitoring. The unit provides exceptional omnidirectional characteristics while withstanding humidity and changing weather conditions.問い合わせ・見積依頼
Weatherproof Microphone Type 4184 is designed for use in humid and corrosive atmospheres, and is built with a casing made completely of stainless steel with a built-in protection system against humidity.
The microphone is in compliance with standards IEC 651 Type 1 and ANSI S 1.4-1983 Type 1.
- 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 the transmission tube which feeds the signal to a point below the mouth of the probe tube.
The probe tube system allows the microphone cartridge to be installed within the casing of the unit itself. This ensures that the microphone is afforded rain protection according to the IEC 529 IP44 standard
Type 4184 is individually calibrated and is delivered with a calibration chart giving the frequency responses.
- Probe (0.3")
- Dyn. range
- 27 – 140 dB
- Freq. range
- 20 – 20000 Hz
- Inherent noise
- 27 dB A
- Lower limiting frequency -3dB
- 4 Hz
- Ext polarized
- Polarization voltages
- 200 V
- Pressure coefficient
- -0.006 dB/kPa
- 12.5 mV/Pa
- Temperature coefficient
- -0.005 dB/ºC
- Temperature range
- -10 – 50 ℃
- Sound field
- Input type
- Microphone type