G.R.A.S. 45BB-2 KEMAR Head & Torso for hearing aid test, 1-Ch CCP
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45BB KEMAR Head and Torso Applications Hearing aid testing Ear- and headphone testing Sound quality recordings Standards ANSI S3.36/ASA58-2012 ANSI S3.25/ASA80-1989 IEC 60318-7:2011 Head and Torso Simulator IEC 60318-4 (60711) Ear Simulator ITU-T Rec. P .57 Type 3.3 Pinna Simulator Features Geometry similar to a real person Accurate in-situ simulation of the effects of a human head and torso in a sound field Configurable with prepolarized or externally polarized microphone-preamplifier assemblies Fig. 1. 45BB KEMAR Head and Torso 55 Shore OO, 35 Shore OO pinnae, and three different ear canal extensions are available worldwide average human male and female head and torso dimensions. It meets the requirements of ANSI S3.36/ASA58-2012 and IEC 603187:2011. Can be mounted with ½" or ¼" pressure microphones for sound quality applications Easy calibration: The pistonphone calibration can be performed from the outside Standard connectors for many types of analyzers 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. It is based on The G.R.A.S. 45BB KEMAR Head and Torso has the same dimensions and acoustical properties as the original KEMAR, but has been developed further by G.R.A.S. 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. Skovlytoften 33, 2840 Holte, Denmark www.kemar.us – gras@gras.dk

45BB KEMAR Head and Torso Artificial Ears Fig. 2. Standard pinnae (normal or soft hardness available) Fig. 3. Small pinnae (normal or soft hardness available) KEMAR Ear Canal Extension The 45BB KEMAR Head and Torso (Fig. 1) is an acoustic research tool with built-in ear simulators that simulates the changes that occur to sound waves as they pass a human head and torso. The standardized Ear Canal Extension RA0237 conforms with the requirements of the IEC 60318-7 standard. It is made of steel and will not deform when testing devices in the concha or devices that are pressed against the...

45BB KEMAR Head and Torso The IEC 60318-4 Ear Simulator tuned resistive grooves. Its input impedance resembles that of the human ear and therefore it loads the device under test in a way very similar to the human ear. The acoustic impedance of the RA0045 is measured at the ear reference point using an impedance probe, in accordance with the ITU-T Recommendations P57 (08/96). Fig. 5. IEC 60318-4 (711) Ear Simulator and Ear Canal Extension The G.R.A.S. Ear Simulator according to IEC 60318-4 is an ear simulator with an input impedance that closely resembles that of the human ear. It meets the...

45BB KEMAR Head and Torso Easy to Use and Maintain Thanks to user-friendly assembly solutions, the 45BB KEMAR is easy to use, maintain and calibrate. 3) Slide backwards Front tap into the recess 2) Lift and tilt simultaneously Neck lock 1) Press the button firmly Fig. 6. The top of the head is released by a push of a button Fig. 7. The top of the head is mounted without tools The ear simulator assembly is locked to the head by four spring-loaded balls Scale and straight lined screw for locking the head at any angle Click-locks at 45°, 0° and - 45° for easy repeatability 0° 45° Ear simulator...

45BB KEMAR Head and Torso Easy to Connect As delivered, KEMAR is fully assembled and tested, ready for use. All you need to do is to make the external connections at the lower back of the torso. Head and Torso Type 45BB Left Ear 200V Power Supply Head and Torso Type 45BB Left Ear 200V internal cabling in torso Power Supply Fig. 12. KEMAR’s sockets. All internal cabling is factory-mounted LEMO cables to ear simulator/ microphone inside the head BNC cables to ear simulator/ microphone inside the head Auxilary Auxilary (mouth) (mouth) mouth) m Auxilary Auxilary u ilar mouth) outh uth (mouth)...

45BB KEMAR Head and Torso 45BB KEMAR Configurations 45BB KEMAR Head and Torso comes in a number of preassembled configurations as described below. A preconfigured 45BB is individually calibrated and delivered with a system calibration certificate. All preconfigured versions come fully assembled and tested, ready for use. The items that are part of the 45BB KEMAR Head and Torso, non configured, are shown in Fig. 15. This basic version is also part of the pre-configured 45BB KEMARs. 45BB KEMAR Configurations Order number KEMAR Head and Torso, non-configured The delivered items are listed on...

45BB KEMAR Head and Torso Specifications Standards ANSI S3.36/ASA58-2012 Specification for a Manikin for Simulated in situ Airborne Acoustic Measurements American National Standard for an Occluded Ear Simulator Head and Torso Simulator for the Measurement of Hearing Aids Ear Simulator, Occluded-ear simulator for the measurement of earphones coupled to the ear by means of ear inserts Type 3.3 Artificial Ears Weight and Dimensions Weght KEMAR Dimensions Adjustable height 92-137cm Weight 3.2 kg KEMAR Base Base /8" UNC-20 standard threaded hole. GR1602 Adapter with 35mm hole for loudspeaker...

45BB KEMAR Head and Torso Ear Simulator Standards IEC 60318-4 Occluded-ear simulators for the measurement of earphones coupled to the ear by ear inserts Series P: Telephone transmission quality, Objective measuring apparatus: Artificial ears American National Standard For an Occluded Ear Simulator Frequency Response Typical frequency response re 500 Hz Typical Frequency Response 40 Resonance frequency Sensitivity Sensitivity Dynamic Range RA0045 (LEMO) Dimensions Height Environmental Calibration Conditions Temperature Relative humidity Barometric pressure

45BB KEMAR Head and Torso Ear Canal Extensions RA0237 Straight Ear Canal Extension, Ø 7.5 mm, 8.3 mm long VA-tapered Ear Canal Extension, Ø 9.85 mm tapering down to Ø 7.5 mm, 7.4 mm long Straight, rubber lined Ear Canal Extension, Ø 7.5 mm, 14 mm long KEMAR Pinnae Standard IEC 60318-7: 2011 Electroacoustics – Simulators of Human Head and Ear Temperature Operation Relative Humidity Operation The warranty does not cover damages due to negligent use or incorrect connections to the equipment. Service and Repair All repairs are made at G.R.A.S. International Support Center located in Denmark....