GRAS 45CA Headphone/Hearing-protector Test Fixture

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GRAS 45CA Headphone/Hearing-protector Test Fixture

Enquiry Item

GRAS 45CA provides the basis for reliable and exact measurements and is designed with


  • A test fixture mounted on a resilient base that reduces the noise floor to a minimum in a typical test situation. Foam plugs and grease are supplied to avoid sound leakage along the cable
  • A test fixture head, made for optimizing the acoustic isolation
  • An acoustic cup and plug for testing the acoustic isolation
  • A range of molded-rubber KEMAR pinnae, e.g. for testing earplugs, can be fitted


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Product Features

The 45CA’s robust design is ideally suited for binaural testing of active and passive earplugs, as well as circumaural hearing protectors. It is primarily intended for testing the performance of hearing-protection devices such as earplugs and earmuffs (supra-aural and circum-aural) but can also be used for testing sound sources such as earphones and headphones. It is fitted with either microphones or ear simulators, depending on the device to test and the standard to comply with.


Compliance with ISO 4869-3, IEC 60318-1, and IEC 60318-4 assures technicians, decision-makers, and authorities of repeatability and transparent data when developing and verifying hearing protectors. The pinnae for the 45CA are the same as the standardized KEMAR pinnae but rounded to fit the large 45CA base plate. This large base plate reduces or eliminates the risk of leakage. The 45CA includes two plugs for measuring the acoustic isolation in a closed ear.


We recommend calibration before each use to ensure the accuracy of your measurements. 


TEDS Compatibility

All CCP-based configurations (-2, -4, -6, -8, -10 and -12) are IEEE 1451.4 TEDS v. 1.0 compliant. If your measurement platform supports Transducer Electronic Data Sheets (TEDS), you will be able to read and write data like properties and calibration data.



If you accidentally damage the Ear Simulator, we can—in most cases—replace and repair it at a very reasonable cost and with short turn-around time. This not only protects your investment but also pleases your quality assurance department because you don’t have to worry about new serial numbers, etc.



Before leaving the factory, all products are calibrated in a controlled laboratory environment using traceable calibration equipment. Depending on the use, measurement environment, and internal quality control programs, we recommend recalibrating the system at least once a year.


Performance and warranty

The GRAS 45CA is made of components from our standard portfolio and are all manufactured of high-quality material and branded parts that were chosen and processed to ensure life-long stability and robustness. This enables us to offer 5 years warranty against defective materials and workmanship.
Exceptions: The warranty period for cables is 6 months.


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