Artificial ears, ear & mouth simulators
GRAS artificial ears and ear & mouth simulators are designed to enable measurements under well defined acoustical conditions. The solutions available include
Thread adapter
GRAS RA0076 Adapter for NBS9A Coupler
The GRAS RA0076 is a thread adapter to use when mounting a 1" or a 1/2" microphone in the RA0075 NBS 9-A Coupler. In the case of a 1/2" microphone the RA0077 1/2" - 1" Adapter for Coupler is also needed...
Volume: 2 cc
ANSI: S3.7
IEC: 60318-5
Special feature: For 1" pressure microphones
GRAS RA0113 1'' 2cc Coupler according to IEC 60318-5
The GRAS RA0113 is a 2cc IEC 60126 coupler which uses a 1" microphone, e.g. the GRAS 40EN.The microphone, without its protection grid, screws into the base of the RA0113...
Volume: 0.4cc
IEC: 60318-8
Use: For hearing aid test up to 16 kHz
GRAS RA0252 1/4” 0.4cc High Frequency Coupler
GRAS RA0252 is a1/4” 0.4cc High freq Coupler for testing of hearing aids at frequencies up to 16 kHz...
100 Hz to 10 kHz according to IEC 60318-4
10 to 20 kHz: ± 2.2 dB test tolerance
Damped resonance, with peak @ 13.5 kHz
Volume 1260 mm³ @ 500 Hz according to IEC 60318-4
Sensitivity 12.5 mV/Pa
Based on ITU-T Rec P.57
GRAS RA0401 Externally Polarized High-Frequency Ear Simulator
The GRAS RA0401 is a high-frequency ear simulator with an acoustic input impedance closely resembling that of an average human ear. It includes a 40AG 1/2" pressure microphone and is individually calibrated with this specific microphone. It features a special dampening system that extends its ..
100 Hz to 10 kHz according to IEC 60318-4
10 to 20 kHz: ± 2.2 dB test tolerance
Damped resonance, with peak @ 13.5 kHz
Volume 1260 mm³ @ 500 Hz according to IEC 60318-4
Sensitivity 12.5 mV/Pa
Based on ITU-T Rec P.57
GRAS RA0402 Prepolarized High-Frequency Ear Simulator
The GRAS RA0402 is a high-frequency ear simulator with an acoustic input impedance closely resembling that of an average human ear. It includes a 40AO 1/2" pressure microphone and is individually calibrated with this specific microphone. It features a special dampening system that extends its ..
100 Hz to 10 kHz: According to IEC 60318-4
10 kHz to 20 kHz: ± 2.2 dB
20 kHz to 50 kHz: ± 3.2 dB
Volume: 1260 mm³ @ 500 Hz
Sensitivity: 1.6 mV/Pa
Damped resonance, with peak @ 13.5 kHz
GRAS RA0403 Externally Polarized Hi-Res Ear Simulator
The GRAS RA0403 is a hi-res ear simulator with an acoustic input impedance closely resembling that of an average human ear. It includes a 40BP 1/4" pressure microphone and is individually calibrated with this specific microphone. It features a special damping system that extends its useful fre..
100 Hz to 10 kHz: According to IEC 60318-4
10 kHz to 20 kHz: ± 2.2 dB
20 kHz to 50 kHz: ± 3.2 dB
Volume: 1260 mm³ @ 500 Hz
Sensitivity: 1.6 mV/Pa
Damped resonance, with peak @ 13.5 kHz
GRAS RA0404 Prepolarized Hi-Res Ear Simulator
The GRAS RA0404 is a hi-res ear simulator with an acoustic input impedance closely resembling that of an average human ear. It includes a 40BD 1/4" pressure microphone and is individually calibrated with this specific microphone. It features a special damping system that extends its useful fre..
