G.R.A.S. has a comprehensive range of couplers, simulators, artificial ears and acoustic test fixtures for the discerning user.
 

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Couplers   : :   G.R.A.S. Sound & Vibration
	RA0038  2cc Coupler (½" microphone)   Standard:     IEC 60126 Ed. OB (prev. IEC 126) and     ANSI S3.7-1973    Comment:     Standard 2 cm3 Coupler according to IEC 126     and ANSI S3.7-1973.     It uses a ½" microphone (preferably the     Type 40AG) with a suitable preamplifier     (e.g. the Type 26AC which is a ¼" preamplifier     but is supplied with an adapter for     ½" microphones).     The RA0038 is for use in the acoustical     measurements of insert type hearing aids     and earphones. To avoid possibly damaging     the microphone, the RA0038 can be used with     a microphone fitted with its protection grid.     The RA0038 is also part of the G.R.A.S.     Artificial Ear Type 43AB.		RA0113  2cc Coupler (1" microphone)   Standard:     IEC 60126 Ed. OB (prev. IEC 126) and     ANSI S3.7-1973    Comment:     A 2cc IEC 60126 coupler which uses a     1" microphone, e.g. the G.R.A.S. Type 40EN.     The microphone, without its protection grid,     screws into the base of the RA0113.     In all other respects, this Coupler is equivalent     to the RA0038.		RA0075  NBS 9-A coupler   Standard:     ANSI S3.7-1975, Coupler calibration     of earphones    Comment:     Coupler for testing earphones according to     ANSI S 3.7 - 1995.      It uses a 1" pressure condenser microphone     with a preamplifier, e.g. the 1" microphone     Type 40EN and a ½" preamplifier Type 26AK     with a ½" to 1" Microphone Adapter RA0073.      The RA0075 is also part of the G.R.A.S.     Artificial Ear Type 43AF.

Artificial Ears & Ear Simulators   : :   G.R.A.S. Sound & Vibration
	Type 43AA artificial ear   Comment:     Complete test jig for acoustical measurements     on telephone handsets and earphones     Comprises:         * IEC 318 Ear Simulator RA0039         * ½" Pressure Microphone Type 40AG         * ¼" Preamplifier Type 26AC         * Test Jig RA0052         * Mounting plates for circum-aural and             supra-aural headphones     The Test Jig has an adjustable spring-loaded     arm to exert a variable force on the test object		Type 43AB artificial ear   Comment:     Complete test-jig for acoustical measurements     on hearing aids     Comprises:         * IEC 126 2-cm3 Coupler RA0038         * ½" Pressure Microphone Type 40AG         * ¼" Preamplifier Type 26AC         * Test Jig RA0052     The Test Jig has an adjustable spring-loaded     arm to exert a variable force on the test object		Type 43AC artificial ear   Comment:     Complete test-jig for acoustical measurements     on earphones coupled to the ear by inserts     such as tubes and ear moulds     Comprises:         * IEC 711 Ear Simulator RA0045         * ½" Pressure Microphone Type 40AG         * ¼" Preamplifier Type 26AC         * Test Jig RA0052     The Test Jig has an adjustable spring-loaded     arm to exert a variable force on the test object
	Type 43AD artifical ear   Comment:     Complete assembly for acoustical     measurements on acoustical transmitters     and loudspeakers     Can be integrated with a telephone test head     or permanently installed on a production     test line     Comprises:         * IEC 318 Ear Simulator RA0039         * ½" Pressure Microphone Type 40AG         * ¼" Preamplifier Type 26AK         * Snap coupling GR0332 and GR0336         * Mounting plates for circum-aural and     supra-aural headphones     The Test Jig has an adjustable spring-loaded     arm to exert a variable force on the test object		Type 43AF eartificial ear   Comment:     Complete test jig for acoustically testing     telephone handsets and earphones     Complies with ANSI S 3.7 - 1995 - American     National Standard for Testing Earphones     Comprises:         * NBS 9-A Coupler RA0075         * Thread Adapter RA0076         * 1" Pressure Microphone Type 40EN             (in 64 AA configuration)         * ¼" Preamplifier Type 26AC         * Type RA0052 Test Jig     The Test Jig has an adjustable spring-loaded     arm to exert a variable force on the test object		Type 43AG ear & cheek simulator   Comment:     Represents the section of a head important for     realistic reproduction of the acoustic properties     of the ear of an average human head     Allows the use of an ITU-T type 3.3 pinna with     a Shore hardness of 55 - 00 or 35 - 00 to be     used with an IEC 60711 Ear Simulator     (RA0045)      Can be used for headsets, hearing aids,     circum-aural headsets, mobile phones etc.
	Type 43AE IEC 60711 ear simulator   Comment:     For acoustically testing supra-aural earphones,     telephone handsets and loudspeakers     Complies with the international     requirements:ITU-T Recommendation P.57     (08/96) "Serie P: Telephone Transmission     quality. Objective measuring apparatus:     Artificial ears"     Comprises:         * IEC 60711 Coupler RA0045         * ¼" Preamplifier Type 26AC         * ¼" - ½" Adapter RA0001         * Low-leak Pinna Simulator RA0056         * High-leak Pinna Simulator RA0057		RA0039  IEC 318 ear simulator   Comment:     An ear simulator with an input impedance     closely resembling that of an average human     ear      When the RA0039 is coupled to a sound source,     the impedance will load the sound source     similar to the loading caused by the human ear     Meets the requirements of IEC 60318-1:1998     Electroacoustics - "Simulators of human head     and ear - Part 1: Ear simulator for the     calibration of supra-aural earphones"		RA0045  IEC 711 ear simulator   Comment:     An ear simulator with an input impedance     closely resembling that of an average human     ear      The RA0045 includes a Type 40AG pressure     microphone and each RA0045 is individually     calibrated with this specific microphone     Meets the requirements of IEC 60711:1981     Occluded-ear simulator for the measurement     of earphones coupled to the ear by ear inserts

Mouth & Pinna Simulators   : :   G.R.A.S. Sound & Vibration
	Type 44AA Mouth simulator (with built-in amplifier)   Comment:     Sound source which simulates the sound field     around the human mouth at close quarters     and complies with the Standards IEEE 269, 661     and ITU-T Rec. P51     For testing telephone mouthpieces as well as     other microphones similarly used in     communication networks     Accepts an external signal either directly or     via its own built-in power amplifier (when     power is applied)		Type 44AB Mouth simulator   Comment:     Sound source which simulates the sound field     around the human mouth at close quarters     and complies with the Standards IEEE 269, 661     and ITU-T Rec. P51     For testing telephone mouthpieces as well as     other microphones similarly used in     communication networks     Accepts an external signal either directly     via BNC input
	RA0056  Low-leak pinna simulator   Comment:     An outer ear simulator intended to be used     with the Ear Simulator RA0045 to simulate a     complete ear for testing telephones and     loudspeakers      Meets the specifications in the ITU-T     Recommendation P.57 (08/96) "Series P:     Telephone transmission quality, Objective     measuring apparatus: Artificial ears"		RA0057  High-leak pinna simulator   Comment:     An outer ear simulator intended to be used     with the Ear Simulator RA0045 to simulate a     complete ear for testing telephones and     loudspeakers      Meets the specifications in the ITU-T     Recommendation P.57 (08/96) "Series P:     Telephone transmission quality, Objective     measuring apparatus: Artificial ears"

KEMAR Head & Torso Simulator   : :   G.R.A.S. Sound & Vibration
	Type 45BA KEMAR Manikin   Comment:     Does not include mouth simulator		Type 45BM KEMAR Manikin with Mouth Simulator   Comment:     Includes mouth simulator		Type 45EA Handset Positioning System for KEMAR   Comment:     Features nine moving segments that simulate     the human arm, wrist, palm, and fingers     holding a handset in the speaking-listening     position      Includes a handset fixture with a spring     arrangement allowing different-sized handsets     to be easily attached and detached     All moving segments are provided with     graduated scales to be read off for repeated     measurements      The system also permits the pinna leakage     pressure to be adjusted and read off accurately     using the force gauge supplied
	KEMAR Manikin Type 45BM and Type 45BA are head and torso simulators (HATS) based on worldwide average human male and female head and torso dimensions and meet the requirements of ANSI S3.36/ASA58-1985. The manikins simulate the changes that occur to sound waves as they pass a human head and torso such as the diffraction and reflection around each ear.   KEMAR Manikin Type 45BM and Type 45BA are identical except that Type 45BM includes a mouth simulator that allows it to be used for testing handsets and headsets.   The KEMAR manikin is the recognised industry-standard for in-situ anthropomorphic testing in the fields of: Telecommunications  Hearing conservation  Noise abatement  Sound recording and sound-quality evaluation

ANSI/ASA S12.42 test fixture   : :   G.R.A.S. Sound & Vibration
	Type 45CB Acoustic test fixture   Comment:     specified and designed to comply with the     newly released ANSI/ASA S12.42 standard.     The test fixture will enable you to test all     types of hearing-protectors in the most     realistic way - both in the acoustic lab and     in the field		Type 67SB CCP Blast Probe   Comment:     designed to comply with the ANSI/ASA S12.42     standard, which states that you must monitor     the noise source in tests.     Equipped with a ⅛" reference microphone     designed to capture impulsive noises with     a very short time resolution.
	The G.R.A.S. 45CB Acoustic Test Fixture is specified and designed to comply with the newly released ANSI/ASA S12.42 standard. This test fixture will enable you to test all types of hearing-protectors in the most realistic way - both in the acoustic lab and in the field. The new standard is unique because it approaches testing of both ear-muffs and ear-plugs - all with the same fixture properties and testing parameters. This makes comparison straight forward, and no questions are asked when it comes to the reliability of your test data. Features include silicone lined inner ear heated inner ear (to body temperature) choice of standard ½" artifical ear or a ¼" artificial ear for very high SPL testing can test 'double' protection - i.e. over-ear protectors on top of insert type protectors simultaneously robust unit, designed for testing with very high impulse sound (e.g. nearby explosions) The G.R.A.S. 67SB LEMO Blast Probe is also designed to comply with the ANSI/ASA S12.42 standard, which states that you must monitor the noise source in tests. The 67SB is equipped with a ⅛" reference microphone that is designed to capture impulsive noises with a very short time resolution.

Other Simulators   : :   G.R.A.S. Sound & Vibration
	Type 45AA Telephone Test Head   Comment:     Tailor-made fixture for testing the acoustic     performance of telephone handsets in     accordance with international standards and     recommendations      Does not include mouth simulator or artificial     ear      Click here for full details		Type 45CA Hearing-protector Test Fixture   Comment:     For testing the performance of hearing-     protection devices such as ear plugs and     ear muffs (supra-aural as well as circum-aural)     Conforms with ISO 4869-3     Can also be fitted with IEC 60711 Ear     Simulators (RA0045) and a range of moulded-     rubber Ears for testing ear plugs

 
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Other G.R.A.S. Sound and Vibration products

• Easy selection Microphone Sets 
• Microphones
• Preamplifiers
• Power Modules
• Simulators:
  • Couplers
  • Artificial Ears and Ear Simulators
  • Mouth & Pinna Simulators
  • KEMAR Head & Torso Simulator
  • ANSI/ASA S12.42 test fixture
  • Telephone Test Head
  • Hearing-protector Test Fixture
• Pistonphones and Calibration equipment  
• Intensity microphones and calibrators
• Intensity Probes
• Accessories