GRAS 45BB KEMAR Head & Torso, Non-configured

Connection: 0 V/CCP or 200 V/LEMO
Channel(s): 2
ANSI: S3.36, S3.25
IEC: 60318-7

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). The GRAS KEMAR has the same dimensions and acoustical properties as the original KEMAR from 1972 and is 100% backwards compatible.

When fitted with pinna simulator, ear canal extension, and IEC 60318-4 Ear Simulator, KEMAR closely mimics the acoustic properties of the human ear.

KEMAR meets the international standards as specified by IEC: 60318-7 and ANSI: S3.36, S3.25.

The 45BB KEMAR is a non-configured KEMAR - without a mouth simulator. The 45BC KEMAR is identical, except that it has a built-in Mouth Simulator. Read more about 45BC KEMAR here.

Design

Anthropometric Head and Torso

The major difference between KEMAR and the standard commercially available head and torso simulators (HATS) is that KEMAR is built on a large statistical research of the average human body – meaning that the KEMAR has the same acoustical properties as an average human, including distinct facial features. Therefore it provides acoustic diffraction similar to that encountered around the median human head and torso, both in the proximity and in the far field. Because of its anthropometric shape it does so more realistically than any other manikin. KEMAR is the only manikin with a changeable ear-to-shoulder ratio simulating both male and female median values.

True to the Legacy - but Improved 

The current KEMAR 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. Today, more than 40 years after its inception KEMAR can test any device that contains both loudspeakers and microphones as well as perform binaural recordings of product sound and music.

At GRAS, we safeguard KEMAR's legacy, but are also continuously expanding the range of features and functionalities leading to new applications and uses - without compromising KEMAR's original form.

In 2013, KEMAR underwent a substantial rejuvenation that introduced major improvements to build quality, user friendliness and configurability. KEMAR’s previous fiberglass construction was updated to a plastic composite that provides a more user friendly and ruggedized construction. At the same time, many other improvements were introduced, making KEMAR much easier to configure, calibrate and service.

Ease of Use

The interior of KEMAR's head can be accessed easily by pushing a button and lifting the scalp.

The transducers are mounted and removed by a simple snap fit mechanism.

Standard pinnae are push mounted from the outside. The anthropometric pinnae, however, are secured from the inside by two screws in addition to the push mounting.

A scale around KEMAR's neck indicates the head angle and allows for repeatable measurements.

In most cases calibration can be done from the outside without dismantling the ear simulator(s). However, for some configurations - with microphones and anthropometric pinnae -  dismounting of the transducers before calibration is necessary.

Cabling and Connections

All internal cabling is factory mounted. The sockets for connection to ear simulators or microphones are easily accessible at the top of the neck, the sockets for connection to instrumentation are located at the lower back.

Mounting Options

KEMAR is delivered with two tripod adapters, one for tripods with 3/8” thread and one for ø35 mm loudspeaker stands.

Typical Applications and Use

A Multi-configurable Test Tool

The 45BB KEMAR Head and Torso, non-configured is a KEMAR without any application specific accessories. As such, this KEMAR is intended for customers who want to reuse accessories already in their possession. But the non-configured KEMAR is also the core of all configured 45BB KEMARs.

The main application specific accessories are:

  • 60318-4 ear simulators, both externally polarized and  prepolarized
  • A low-noise ear simulation system, externally polarized
  • ½ inch or ¼  inch. microphones, externally polarized and  prepolarized
  • Preamplifiers selected to match the actual configuration
  • Straight and conical ear canal extensions, made from steel
  • Straight and conical ear canal extensions, made from POM
  • 12 different standard pinnae, small and large, soft and hard, normal or VA-style
  • 2 anthropometric pinnae, with anthropometric concha and ear canal.

With these, KEMAR can be configured for a wide range of both standard and special applications, making it the most versatile manikin for in-situ anthropometric testing today.

KEMAR is used in various industries around the world and is the recognized industry-standard for in-situ anthropomorphic testing in the fields of:

  • Hearing aid testing
  • Ear and headphone testing
  • Sound recording and sound-quality evaluation

A KEMAR with Mouth Simulator can be configured for headset testing and telephone test. Read more here.

KEMAR is available in a number of configurations that are delivered fully assembled, tested and calibrated as complete out-of-the-box systems. Each configuration is optimized for a specific application, with transducer(s), preamplifiers, pinna simulators, and cables and accessories.

The pre-configured KEMARs are listed below:

KEMAR for Hearing Aid test

Single-channel Test of Hearing Aids

For single-channel testing of hearing aids, a LEMO version and a CCP version are available. They are configured with a 60318-4 ear simulator and large pinnae 55 Shore OO. Read more here:

GRAS 45BB-1 KEMAR for Hearing Aid test, 1-Ch LEMO

GRAS 45BB-2 KEMAR for Hearing Aid test, 1-Ch CCP

Test of Binaural Hearing Aids

For testing of binaural hearing aids that use RF communication, similarly configured KEMARs are available, but these use non-metal (POM) ear canal extensions and ear holder plates that do not interfere with RF communication. Read more here:

GRAS 45BB-7 KEMAR for Test of Binaural Hearing Aid, 2-Ch LEMO

GRAS 45BB-8 KEMAR for Test of Binaural Hearing Aid, 2-Ch CCP

KEMAR for Ear and Headphone Test

Testing of Ear and Headphones

For ear and headphone testing, a KEMAR configured with 60318-4 ear simulators and standard large straight pinnae 55 Shore OO is available, both in a LEMO and a CCP version. Read more here:

GRAS 45BB-5 KEMAR for Ear and Headphone Test, 2-Ch LEMO

GRAS 45BB-6 KEMAR for Ear and Headphone Test, 2-Ch CCP

Testing of Ear and Headphones with Anthropometric Pinnae

For testing of modern in-ear type ear and headphones, a KEMAR configured with 60318-4 ear simulators and anthropometric pinnae 35 Shore OO is available. Both a LEMO and a CCP version are available The anthropometric pinna introduce some  advantages to fit and repeatability when testing anthropometrically shaped insert types of ear and headphones. Read more here:

GRAS 45BB-9 KEMAR with Anthropometric Pinnae for Ear and Headphone Test, 2-Ch LEMO

GRAS 45BB-10 KEMAR for Anthropometric Pinnae for Ear and Headphone Test, 2-Ch CCP

Low-noise Testing of Ear and Headphones

For low-noise testing of ear and headphones, a single channel and a dual channel version are available. The combination of a special low-noise version of the ear simulator and the anthropometric pinnae introduces major improvements to fit, accuracy, repeatability, and low- and high frequency performance when testing ear and headphones. This KEMAR can also test at or below the threshold of human hearing. It is available for single and dual-channel testing. The low-noise artifial ear is available in a LEMO version only. Read more here:

GRAS 45BB-11 KEMAR with Anthropometric Pinnae for Low-noise Ear and Headphone Test, 1-Ch LEMO

GRAS 45BB-12 KEMAR with Anthropometric Pinnae for Low-noise Ear and Headphone Test, 2-Ch LEMO

KEMAR for Sound Quality Recording

A KEMAR configured with 1/2" pressure microphones for sound quality evaluation and recording is available, both in a LEMO and a CCP version. Read more here:

GRAS 45BB-3 KEMAR for Sound Quality Recording, 2-Ch LEMO

GRAS 45BB-4 KEMAR for Sound Quality Recording, 2-Ch CCP

KEMAR with Mouth Simulator

In addition to the 45BB KEMARs, a number of pre-configured KEMARs with mouth simulator are available. These are:

GRAS 45BC-1 KEMAR for Headset Test, 2-Ch LEMO

GRAS 45BC-2 KEMAR for Headset Testt, 2-Ch CCP

GRAS 45BC-3 KEMAR for Telephone Test, 1-Ch LEMO

GRAS 45BC-4 KEMAR for Telephone Test, 1-Ch CCP

GRAS 45BC-9 KEMAR with Mouth Simulator and Anthropometric Pinnae for Headset Test, 2-Ch LEMO

GRAS 45BC-10 KEMAR with Mouth Simulator and Anthropometric Pinnae for Headset Test, 2-Ch CCP

GRAS 45BC-11 KEMAR with Mouth Simulator and Anthropometric Pinnae for Low-noise Headset Test, 1-Ch LEMO

GRAS 45BC-12 KEMAR with Mouth Simulator and Anthropometric Pinnae for Low-noise Headset Test, 2-Ch LEMO

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
7-pin LEMO (FGG.1B.307)
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
Weight
g / oz
11.45 k / 404
Specification Conditions

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

Ordering info

Included items

GRAS 45BH

KEMAR Head Assembly, non configured

GRAS 45BT

KEMAR Torso

GRAS GR1589

Neck Extension Ring, 11 mm, 2 pcs

GRAS KB0010

T-Shirt

GRAS SW0005

USB Flash Drive with HRTF and Free-field corrections data

GRAS KB0000

KEMAR Book

GRAS YY0018

Allen key, 2 mm

GRAS YY0013

Allen key, 4 mm

GRAS YY0039

Screwdriver, 5.5 mm

GRAS GR1573

Bottom plate with 3/8" thread for tripod, factory mounted

GRAS GR1602

Bottom plate with 35 mm hole for loudspeaker stand (AL0026)

 

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 Pinna 55 Shore OO

GRAS KB0061

KEMAR Small Left Pinna 55 Shore OO

GRAS KB0065

KEMAR Large Right Pinna 55 Shore OO 

GRAS KB0066

KEMAR Large Left Pinna 55 Shore OO

GRAS KB1060

KEMAR Small Right Pinna 35 Shore OO 

GRAS KB1061

KEMAR Small Left Pinna 35 Shore OO

GRAS KB1065

KEMAR Large Right Pinna 35 Shore OO 

GRAS KB1066

KEMAR Large Left Pinna 35 Shore OO

GRAS KB0090

KEMAR Large Right Pinna (VA-Style/SQ) 55 Shore OO 

GRAS KB0091

KEMAR Large Left Pinna (VA-Style/SQ) 55 Shore OO

GRAS KB1090

KEMAR Large Right Pinna (VA-Style) 35 Shore OO 

GRAS KB1091

KEMAR Large Left Pinna (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 1/4" 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 from POM, Nylon and Teflon

 

KEMAR Retrofit Kit for Anthropometric Pinna

GRAS RA0311

KEMAR Retrofit Kit for Anthropometric Pinna.

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

 

Extension Cables

GRAS AA0008

LEMO 7-pin - LEMO 7-pin Cable, 3 m 

GRAS AA0009

LEMO 7-pin - LEMO 7-pin Cable, 10 m

GRAS AA0020-CL

LEMO 7-pin - LEMO 7-pin Cable Cable, Customized Length, xxxx cm

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

 

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 specifications and accessories without notice.

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