GRAS 45BC-2 KEMAR Head & Torso with Mouth Simulator for Headset Test, 2-Ch CCP

Connection: CCP
Channel(s): 2
ANSI: S3.36, S3.25
IEC: 60318-4
ITU-T Rec. P.57 Type 3.3 based on ITU-T Rec. P.58
Special feature: Built-in power amplifier for mouth simulator

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 current 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 45BC KEMARs consist of the same basic 45BC 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 45BC KEMAR Non-configured and the information for a given configured version as found in the present text. Read about the non-configured KEMAR here.

Design

The 45BC-2 is a KEMAR for 2-channel headset test, with prepolarized ear simulators and large straight pinnae.

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.

The main configuration specific components of the 45BC-2 are the 44AA Mouth Simulator, the RA0045-S1 Ear Simulator According to 60318-4 and the KB0065/KB0066 Large Straight Pinnae.

The 44AA Mouth Simulator according to ITU-T Rec. P51 with built-in power amplifier

The maximum continuous signal the mouth can produce in 1/3-octave bands is 100dB re. 20µPa in the frequency range 100Hz to 16kHz. Its loudspeaker accepts an external signal either directly or via its own built-in power amplifier (when power is applied).

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 the RA0045-S1 Ear Simulator.

The KB0065/KB0066 Pinnae

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 and are all manufactured of high-quality material and branded parts that were chosen and processed to ensure life-long stability and robustness. This, enables us to offer 2 years warranty against defective materials and workmanship.
Exceptions: Microphones included in KEMAR as for these our normal 5 year warranty apply. The warranty period for cables is 6 months.

Specifications

Connector type
3 m 7-pin LEMO
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
60318-7
ITU-T recommondations
P. 58
Weight
g / oz
11.45 k / 404
MOUTH SIMULATOR
.
Output impedance
Ω
8
Maximum power, continuous
W
10
Maximum power, pulsed 2 sec.
W
50
Input impedance
20
Gain
dB
10
Input signal, max.
Vrms
2
Power supply, external
Vdc
24
Specification Conditions

GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.

Ordering info

Included items

GRAS 45BC

KEMAR Head & Torso with GRAS 44AA Mouth Simulator, non-configured

GRAS KB0065

KEMAR Large Right Ear 55 Shore OO

GRAS KB0066

KEMAR Large Left Ear 55 Shore OO

GRAS RA0237

Straight Ear Canal Extension Kit for KEMAR (2 pcs)

GRAS RA0045-S1

IEC 60318-4 Ear Simulator, (Prepol.version, 2 pcs)

GRAS 26CS

1/4" CCP Standard Preamplifier with Microdot Connector, Very Short (2 pcs)

GRAS RA0001

Adapter for 1/2" Microphone and 1/4" Preamplifier (2 pcs)

GRAS AA0018-S

Microdot-BNC Cable, 35 cm (2 pcs)

GRAS AA0035

3 m BNC - BNC Cable (2 pcs)

GRAS 46BD

1/4" CCP Pressure Standard Microphone Set

GRAS AA0070

Microdot-BNC Cable, 3 m

 

Optional items

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 

 

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 1/4" 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.

 

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 

GRAS AA0039-CL

BNC-BNC Cable, Customized Length, xxxx cm 

 

Flight Case

GRAS KM0094

 PELI Case for KEMAR

 

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 specifications and accessories without notice.

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