GRAS 45BB-8 Head & Torso for Test of Binaural Hearing Aid, 2-Ch CCP
Connection: Constant Current Power (0 V/CCP)
Channel(s): 2
ANSI: S3.36, S3.25
IEC: 60318-7, 60318-4
ITU-T Rec. P.57 Type 3.3 based on ITU-T Rec. P.58
The 45BB-8 KEMAR Head and Torso with TEDS for test of binaural HA, 2-Ch CCP is an acoustic research tool with built-in ear simulators that simulates the changes that occur to soundwaves as they pass a human head and torso. KEMAR fitted with pinna simulator, ear canal extension, and IEC 60318-4 Ear Simulator resembles the acoustic impedance of the human ear. This KEMAR configuration is suitable for hearing aids using RF communication by using non-metal (POM) ear canal extensions and ear holder plates. Its corresponding LEMO equivalent is GRAS 45BB-7 KEMAR Head & Torso for Test of Binaural Hearing Aid 2-Ch LEMO.
Technology
Introduction
The KEMAR head and torso simulator was introduced by Knowles in 1972 and quickly became the industry standard for hearing-aid manufacturers and research audiologists (visit KEMAR.us to read the full story). It is based on worldwide average human male and female head and torso dimensions. It meets the requirements of ANSI S3.36/ASA58-2012 and IEC 60318-7:2011.
The GRAS 45BB-8 KEMAR Head and Torso has the same dimensions and acoustical properties as the original KEMAR, but has been developed further by GRAS to meet the industry’s demand for realistic measurements of hearing aids, headphones and headsets. It provides acoustic diffraction similar to that encountered around the median human head and torso, both in the proximity and in the far-field.
As all the preconfigured 45BB KEMARs consist of the same basic 45BB KEMAR Non-configured, plus a set of application-specific accessories, the full information about a given KEMAR configuration is obtained by combining the information about the 45BB KEMAR Non-configured and the information for a given configured version as found in the present text. Read about the non-configured KEMAR here.
TEDS Compatibility
All CCP-based KEMAR configurations 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.
Design
The 45BB-8 is a KEMAR head and torso for binaural hearing aid test, with prepolarized ear simulators and large 55 Shore OO pinnae. A special feature is that the ear holder plates, ear canal extensions, and accompanying screws are made of POM, Nylon, and Teflon to allow RF signals to pass inside KEMAR’s head.
It is delivered fully configured, individually calibrated and ready for use. In addition to a system calibration certificate, a USB flash memory with simulation data is included.
Apart from the abovementioned use of plastic materials, the main configuration-specific components of the 45BB-8 are the GRAS RA0045-S1 Ear Simulator According to 60318-4 and the KB0066/KB50065 large pinnae.
The 60318-4 Ear Simulator
The acoustic input impedance of the RA0045-S1 Ear Simulator closely resembles that of the human ear and, as a result, loads a sound source in very much the same way.
It complies with IEC 60318-4 and is measured and calibrated according to ITU-T P.57. It embodies a number of carefully designed volumes connected via well-defined and precisely tuned resistive grooves. In an equivalent electrical circuit, capacitors would represent the volumes, and inductance and resistance would represent respectively air mass and air flow within the resistive groves.
Read more about RA0045-S1 here.
The KB0065/KB0066 Pinna
The KB0065 and KB0066 are large straight pinnae for use with a straight ear canal extension. The hardness is 55 Shore 00. They comply with the IEC and ITU-T recommendations.
Other accessories for this configuration are listed in the Ordering Info tab.
Performance and warranty
KEMAR is made of components from our standard portfolio, all manufactured of high-quality material and branded parts chosen and processed to ensure life-long stability and robustness. This enables us to offer a two-year warranty against defective materials and workmanship.
Exceptions: Microphones included in KEMAR as for these our normal five-year warranty apply. The warranty period for cables is six months.
Specifications
GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.
Ordering info
Included items
GRAS 45BB |
KEMAR Head & Torso, Non-configured |
GRAS KB0065 |
KEMAR Large Right Ear 55 Shore OO |
GRAS KB0066 |
KEMAR Large Left Ear 55 Shore OO |
GRAS RA0249 |
Straight Ear Canal Extension Kit (made of POM, 2 pcs) |
GRAS RA0045-S1 |
IEC 60318-4 Ear Simulator (Prepol. version, 2 pcs) |
GRAS 26CS |
1/4" CCP Short Preamplifier (2 pcs) |
GRAS RA0001 |
Right-angled Adapter for 1/2" Microphone and 1/4" Preamplifier (2 pcs) |
GRAS GR0408 |
Exterior Ear Canal |
GRAS GR0409 |
Union Nut |
GRAS AA0018-S |
Microdot- BNC Cable, 35 cm (2 pcs) |
GRAS AA0035 |
BNC-BNC Cable, 3 m (2 pcs) |
Optional items
Power Modules for Externally Polarized Ear Simulators and Microphones
GRAS 12AK |
1-Channel Power Module with gain, filters and SysCheck generator |
GRAS 12AD |
1-Channel Power Module |
GRAS 12AA |
2-Channel Power Module with gain, filters and SysCheck generator |
GRAS 12AR |
2-Channel Power Module |
2-Channel Universal Power Module with signal conditioning and PC interface |
Power Modules for Pre-polarized Ear Simulators and Microphones
1-Channel CCP Power Module with A-weighting filter |
|
GRAS 12AQ |
2-Channel Universal Power Module with signal conditioning and PC interface |
For Ear Simulator Calibration
GRAS 42AP |
Intelligent Pistonphone (250 Hz or 251.2 Hz, 114 dB +/- 0.05 dB) |
GRAS 42AA |
Pistonphone (250 Hz, 114 dB +/- 0.08 dB) |
GRAS RA0157 |
1/2" Calibration Adapter for KEMAR Pinna |
Pinna Simulators
GRAS KB0060 |
KEMAR Small Right Ear 55 Shore OO |
GRAS KB0061 |
KEMAR Small Left Ear 55 Shore OO |
GRAS KB0065 |
KEMAR Large Right Ear 55 Shore OO |
GRAS KB0066 |
KEMAR Large Left Ear 55 Shore OO |
GRAS KB1060 |
KEMAR Small Right Ear, 35 Shore OO |
GRAS KB1061 |
KEMAR Small Left Ear 35 Shore OO |
GRAS KB1065 |
KEMAR Large Right Ear 35 Shore OO |
GRAS KB1066 |
KEMAR Large Left Ear 35 Shore OO |
GRAS KB0090 |
KEMAR Large Right Ear (VA-Style/SQ) 55 Shore OO |
GRAS KB0091 |
KEMAR Large Left Ear (VA-Style/SQ) 55 Shore OO |
GRAS KB1090 |
KEMAR Large Right Ear (VA-Style) 35 Shore OO |
GRAS KB1091 |
KEMAR Large Left Ear (VA-Style) 35 Shore OO |
GRAS KB5000 |
KEMAR Large Right Anthropometric Pinna 35 Shore OO |
GRAS KB5001 |
KEMAR Large Left Anthropometric Pinna 35 Shore OO |
Ear Mould Simulators
GRAS KB0110 |
Ear Mould Simulator for 2 mm Inner diameter tubing |
GRAS KB0111 |
Ear Mould Simulator for 3 mm Inner diameter tubing |
Ear Canal Extension and Microphone Holder Kits (kits with 2 pcs and O-rings)
GRAS RA0237 |
Straight Ear Canal Extension Kit for KEMAR |
GRAS RA0238 |
VA-tapered Ear Canal Extension Kit for KEMAR |
GRAS RA0239 |
Ear canal Extension Kit w. silicone lining for KEMAR |
GRAS RA0240 |
Holder for long 1/2" microphone Kit for KEMAR |
GRAS RA0241 |
Holder for short 1/2" microphone Kit for KEMAR |
GRAS RA0243 |
Holder for 1/2" microphone Kit for KEMAR |
GRAS RA0244 |
O-ring kit for KEMAR, 2 pcs. |
GRAS RA0249 |
Straight Ear Canal Extension Kit for KEMAR, made of POM, for binaural hearing aid test |
GRAS RA0250 |
Tapered Ear Canal Extension Kit for KEMAR, made of POM, for binaural hearing aid test |
KEMAR Retrofit Kit for Binaural Hearing Aid Test
GRAS RA0251 | KEMAR Retrofit Kit for Binaural Hearing Aid Test: The Kit includes Ear Holder Plates, mounting bolts and the RA0249 and RA0250 Ear Canal Extension Kits. Included items are made of POM, Nylon and Teflon. |
KEMAR Retrofit Kit for Anthropometric Concha and Canal Pinna
GRAS RA0311 |
KEMAR Retrofit Kit for Anthropometric Concha and Canal Pinna. |
Extension Cables
GRAS AA0034 |
BNC-BNC Cable, 2 m |
GRAS AA0035 |
BNC-BNC Cable, 3 m |
GRAS AA0036 |
BNC-BNC Cable, 5 m |
GRAS AA0037 |
BNC-BNC Cable, 10 m |
Flight Case
GRAS KM0094 |
PELI Case for KEMAR |
Simulation Model of KEMAR
GRAS KB3000 |
Simulation Model of KEMAR with large pinnae |
GRAS KB3001 |
Simulation Model of KEMAR with small pinnae |
Stand for KEMAR
GRAS AL0026 |
Loudspeaker stand for KEMAR, Ø 35 mm |
Miscellaneous
GRAS KB0000 |
KEMAR Handbook |
GRAS KB0010 |
T-Shirt for KEMAR |
GRAS Sound & Vibration reserves the right to change accessories without notice.