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
Volume: 1260 mm³ @ 500 Hz
Dyn range: 25 dB(A) to 164 dB
Sensitivity 12.5 mV/Pa
IEC: 60318-4
GRAS RA0045 Externally Polarized Ear Simulator According to IEC 60318-4 (60711)
The GRAS RA0045 is an ear simulator with an acoustic input impedance closely resembling that of an average human ear. It includes a 40AG pressure microphone and is individually calibrated with this specific microphone.
Standards: IEC 60318-4 (based on), ITU-T P.57
Eff vol: 1260 mm³ @ 500 Hz
Res freq: 13.5 kHz ±1 kHz
GRAS RA0045-S4 Externally Polarized Ear Simulator Based on IEC 60318-4 (60711), High Sensitivity
The GRAS RA0045-S4 Ear Simulator is an ear simulator with an acoustic input impedance closely resembling that of an average human ear. The RA0045-S4 includes a 40AP pressure microphone and each RA0045-S4 is individually calibrated with this specific microphone.
Standards: IEC 60318-4 (based on), ITU-T P.57
Eff vol: 1260 mm³ @ 500 Hz
Res freq: 13.5 kHz ±1 kHz
GRAS RA0045-S5 Externally Polarized Ear Simulator Based on IEC 60318-4 (60711), High Pressure
The GRAS RA0045-S5 Ear Simulator is an ear simulator with an acoustic input impedance closely resembling that of an average human ear. The RA0045 includes a 40BP pressure microphone and each RA0045-S5 is individually calibrated with this specific microphone.
ITU-T rec.: P.51
Special feature: Built-in power amplifier
GRAS 44AA Mouth Simulator according to ITU-T Rec. P51 with built-in power amplifier
GRAS 44AA Mouth Simulator is a sound source that simulates the sound field around the human mouth at close quarters and complies with the Standards IEEE 269, 661 and ITU-T Rec. P51. GRAS 44AA is for testing telephone mouthpieces as well as other microphones similarly used in communication networks.
ITU-T rec.: P.51
IEEE standards: 269, 661
GRAS 44AB Mouth Simulator according to ITU-T Rec. P51
GRAS 44AB Mouth Simulator is a sound source that simulates the sound field around the human mouth at close quarters and complies with the Standards IEEE 269, 661 and ITU-T Rec. P51. GRAS 44AB is for testing telephone mouthpieces as well as other microphones similarly used in communication networks.
Volume: 1260 mm³ @ 500 Hz
Dyn range: 25 dB(A) to 150 dB
Sensitivity 12.5 mV/Pa
IEC: 60318-4
GRAS RA0045-S1 Prepolarized Ear Simulator According to IEC 60318-4 (60711)
GRAS RA0045-S1 is an ear simulator with an acoustic input impedance closely resembling that of an average human ear. The RA0045 includes a 40AO 1/2" prepolarized pressure microphon and each RA0045 is individually calibrated with this specific microphone.
Standards: IEC 60318-4 (based on), ITU-T P.57
Eff vol: 1260 mm³ @ 500 Hz
Res freq: 13.5 kHz ±1 kHz
GRAS RA0045-S6 Prepolarized Ear Simulator Based on IEC 60318-4 (60711), High Sensitivity
The GRAS RA0045-S6 Prepol Ear Sim IEC 60318-4, High Sensitivity is an ear simulator with an acoustic input impedance closely resembling that of an average human ear. The RA0045 includes a 40AD pressure microphone and each RA0045-S6 is individually calibrated with this specific microphone.
Volume: 2 cc
ANSI: S3.7
IEC: 60318-5
Special feature: For 1/2" pressure microphones
GRAS RA0038 1/2'' 2cc Coupler according to IEC 60318-5
The GRAS RA0038 Coupler is a standard 2 cm³ Coupler according to IEC 126 and ANSI S3.7-1973. It uses a ½" microphone (preferably the GRAS 40AG) with a suitable preamplifier (e.g. GRAS 26AC which is a ¼" preamplifier but is supplied with an adapter for ½" microphones).
Volume: Complex
ANSI: S3.7
IEC: 60318-1
GRAS RA0039 Ear Simulator according to IEC 60318-1
The GRAS IEC 318 RA0039 Ear Simulator is an ear simulator with an input impedance closely resembling that of an average human ear. When the RA0039 is coupled to a sound source, the impedance will load the sound source similar to the loading caused by the human ear. The RA0039 meets the requirements of IEC 60318-1:1998 Electroacoustics - "Simulators of human head and ear - Part 1: Ear simulator for the calibration of supra-aural earphones".
Volume: Complex
GRAS RA0056 Low-leak Pinna Simulator according to ITU-T Rec. P57 Type 3.2
The GRAS RA0056 Low-leak Pinna Simulator is an outer ear simulator intended to be used with the Ear Simulator RA0045 to simulate a complete ear for testing telephones and loudspeakers
Volume: Complex
GRAS RA0057 High-leak Pinna Simulator according to ITU-T Rec. P57 Type 3.2
The High-leak Pinna Simulator Type RA0057 is an outer ear simulator intended to be used with the Ear Simulator RA0045 to simulate a complete ear for testing telephones and loudspeakers.
Volume: 6 cc
ANSI: S3.7
IEC: 60318-3
GRAS RA0075 6cc Coupler
The GRAS RA0075 is a 6cc coupler for testing earphones according to ANSI 3.7 - 1995 and IEC 60318-3.
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 useful frequency range to 20 kHz. Its prepolarized equivalent is RA0402.
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 useful frequency range to 20 kHz. Its externally equivalent is GRAS RA0401.
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 frequency range to 50 kHz. Its prepolarized equivalent is RA0404.
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 frequency range to 50 kHz. Its externally polarized equivalent is RA0403.