20. 0.4cc CCP 1/4" High Frequency Coupler Kit -43BA-2

The G.R.A.S. 43BA-2

A high frequency 1/4" 0.4cc coupler kit for test of hearing aids at frequencies up to 16 kHz. It is a complete kit with a 1/4" Pressure Microphone and a 1/4" Preamplifier with BNC connection and the same adapters known from the reference 2cc coupler.

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More Details: G.R.A.S. 43BA-2

More details

A high frequency 1/4" 0.4cc coupler kit for test of hearing aids at frequencies up to 16 kHz. It is a complete kit with a 1/4" Pressure Microphone and a 1/4" Preamplifier with BNC connection and the same adapters known from the reference 2cc coupler. It is easy and safe to handle and calibrate because the microphone grid does not have to be removed for mounting or calibration.

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Typical applications and use
It is designed in accordance with the Technical Specification "IEC TS 62886:2016 Electroacoustics - Hearing aids - Method for measuring electroacoustic performance up to 16 kHz". It meets the need for an accurate and repeatable measurement method that can be used by designers of hearing aids and hearing aids receivers, and by fitters of hearing aids. 

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The small volume in combination with the 1/4" microphone results in a wide frequency range that makes it useful for high-frequency diagnostics. The extended frequency range also ensures that it is a future proof choice for high-frequency testing of wide-band hearing aids.

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Its 0.4cc volume is a well defined cylinder where the diaphragm of the microphone is flush with the bottom of the cylinder. The cylinder is machined to within ±2% of the nominal 0.4cc volume. The exact volume for each individual coupler is stated in the accompanying calibration chart. The performance of the 0.4cc coupler can therefore be accurately simulated, and it can easily be a part of a complete simulation model.

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The 43BA is designed for repetitive use and is equally suited for research, quality assurance and production test applications.

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