GRAS 147EB CCP X-Rugged Microphone Set

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GRAS 147EB CCP X-Rugged Measurement Microphone Set

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147EB is a free-field microphone optimized for wheelhouse brake noise testing in the automotive industry. It is designed to withstand the conditions in the wheelhouse during prolonged testing on public roads in all types of climate and weather.

A rugged design that withstands shock and vibrations combined with a three-layer protection system for the diaphragm enables it to be used for realistic testing of brakes on proving grounds and public roads. The two protective grids and the customized windscreen are easily replaceable consumables. With the 147EB it is now no longer necessary to use sub-standard microphones and cumbersome customized protection for acoustic road testing of brakes - it is now possible to measure without compromising data quality using a high-quality IEC 61672 class 2 microphone.


Freq range: 3.15 Hz to 20 kHz
Dyn range: 18 dB(A) to 133 dB
Sensitivity: 50 mV/Pa
Temperature: -40 to +125°C
Humidity: 0 – 90%
IEC 61672 class 2



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Product Features

  • Waterproof

Can safely be used in wet and splashy conditions - the microphone-preamplifier housing is certified watertight according to IP67.


  • Shock-absorbing Design

Innovative design ensures accurate data even during rough testing, e.g. on proving grounds or public roads.


  • Extreme Temperature Performance

Optimized for extreme temperatures without compromising sensitivity. It is the most temperaturestable CCP microphone on the market.


  • Windscreen

A customized and easily replaceable windscreen constitutes the outer layer of protection and guards against rain, snow and impacts from gravel, etc.


  • Water, Oil and Dust-resistant and Replaceable Grid

Two grids – fitted simultaneously – with built-in filters ensure that it can be used in heavily contaminated environments with dust, dirt, water, snow and ice. Easy replacement.


  • Waterproof Connection

Can safely be used in wet and splashy conditions. A rubber-sleeved connection ensures data integrity and survivability during outdoor tests in all types of weather.


  • Protected Venting

Dual, protected venting prevents moisture from blocking the venting and ruining your measurements.


  • Online Calibration Data

Calibration data for each specific microphone can be accessed at