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

Connector type
BNC
Set sensitivity @ 250 Hz (±2 dB)
mV/Pa
12.5
Set sensitivity @ 250 Hz (±2 dB)
dB re 1V/Pa
-38.5
Theoretical dynamic range lower limit with GRAS preamplifier
dB(A)
25
Theoretical dynamic range upper limit with GRAS preamplifier @ +28 V / ±14 V power supply
dB
151
Theoretical dynamic range upper limit with GRAS CCP preamplifier
dB
146
Resonance frequency
kHz
13.5
Temperature range, operation
°C / °F
-30 to 60 / -22 to 140
Temperature range, storage
°C / °F
-40 to 65 / -40 to 149
Humidity range non condensing
% RH
0 to 95%
ANSI standard
S3.36, S3.25
IEC standard
60318-4 (former 60711), 60318-7 (former 60959)
ITU-T recommondations
P.380
Weight
g / oz
11.45 k / 404

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 

GRAS 12AQ

2-Channel Universal Power Module with signal conditioning and PC interface

Power Modules for Pre-polarized Ear Simulators and Microphones

GRAS 12AL

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.
The Kit includes Ear Simulator Holder, 2 finger screws and a 3 mm Allen Key.

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.