GRAS original 45BC artificial head

GRAS original 45BC artificial head

GRAS type G.R.A.S type

45BC-14

Parameter KEMAR mit Mund&

anthropometric ears (2-channel

CCP)

45BC-14GRAS type G.R.A.S type

GRAS 45BC-14， Artificial Head

G. R.A.S. Denmark GRAS Measurement Microphone GRAS-246AE Frequency Range: 3.15 Hz to 20 kHz Dynamic Range: 17 dB (A) to 138 dB Sensitivity: 50mV/Pa IEC 61672 Class 1 Supports SysCheck2 Automatic Verification Function

2.

GRAS type G.R.A.S type GRASGRAS type

G. R.A.S. Denmark G.R.A.S. 12AK parameter Mikrofon Speiser ä t 1-Kanal

with amplification, filters and SysCheck

Generator (including power supply AB0002)

GRAS 12AK

GRAS type G.R.A.S type

GRAS 12AX

GRAS has sailed across the ocean from overseas factories to China. GRAS original factory GRAS model

Introduction to GRAS original 45BC artificial head

G. Introduction to R.A.S. Original 45BC Artificial Head

G. R.A.S. Denmark GRAS

45BC-14 artificial head \ GRAS45BC-14

45BC-14 Artificial Head \ \ GRAS

G. R.A.S. Denmark GRAS

45BC-14 Artificial Head \ \ GRAS45BC-1445BC-14 Artificial Head Parameters

KEMAR with mouth &

anthropometric ears (2-channel

CCP)

Includes:

- 1 x KEMAR head with mouth simulator &

Torso 45BC, unconfigured

- 1 x Large right ear KB5000,

anthropometrisch (35 Shore OO)

- 1 x Large left ear KB5001,

anthropometrisch (35 Shore OO)

- 2 x Pre-polarized high-resolution

Ohrsimulator Typ RA0402 (IEC 60318-4)

- 2 x Ohrsimulator-Halter GR1874

- 2 x external ear canal GR0408 (for

calibration)

- 2 x Overhead nut GR0409 (for

GR0408)

- 2 x 1/4' preamplifier 26CS, short, with

Mikdotstecker

- 2 x rectangular adapter RA0001 for

1/2' microphone and 1/4' preamp

- 2 x Mikrodot-BNC Kabel AA0018-S (35

cm)

- 2 x BNC-BNC Kabel AA0035 (3 m)

G. R.A.S. Denmark GRAS Power Supply 12BEG. R.A.S. Denmark

12BE参数CCP Microphone feeder 2-channel with TEDS support

GRAS original 45BC artificial head is a precision device designed specifically for acoustic measurement and audio analysis. It adopts excellent simulation technology to simulate the acoustic characteristics of the human head, and is widely used in audio equipment testing, acoustic research, virtual reality and other fields. Its design aims to achieve realistic acoustics, ensuring the accuracy and reliability of measurement results.

The core feature of the 45BC artificial head is its precise acoustic simulation capability. It can accurately reproduce the propagation path and reflection effect of sound in reality by simulating several structures and acoustic characteristics of the human head. This makes it perform well in the performance evaluation of audio devices, especially in the testing of headphones, microphones, and other devices, where it can approach data from real usage scenarios.

In addition, the 45BC artificial head also has a built-in microphone system with sensitivity. These microphones are precisely calibrated to capture subtle sound changes, ensuring the accuracy of measurement data. Its frequency response range is wide, covering the complete spectrum from low frequency to frequency, meeting various acoustic testing needs.

In terms of functionality, the 45BC artificial head supports multiple measurement modes, including free field and diffusion field measurements, suitable for different testing scenarios. Its modular design makes equipment installation and maintenance more convenient, while also providing flexibility in use. Users can choose different configuration options based on their specific needs to meet different testing requirements.

Overall, the GRAS original 45BC artificial head has become an important tool in the field of acoustic measurement due to its precise acoustic simulation capabilities, sensitive microphone system, and flexible functional design. It not only provides reliable testing data, but also provides strong support for the development and optimization of audio equipment.

Introduction to GRAS original 45BC artificial head

G. Introduction to R.A.S. Original 45BC Artificial Head

G. R.A.S. GRAS alone 45BC-14 parameter KEMAR mit Mund&anthropometrichen Ohren (2-KanalCCP)

G. R.A.S. Denmark GRAS Measurement Microphone GRAS-246AE Frequency Range: 3.15 Hz to 20 kHz Dynamic Range: 17 dB (A) to 138 dB Sensitivity: 50mV/Pa IEC 61672 Class 1 Supports SysCheck2 Automatic Verification Function

246AE

GRAS 1-meter BNC line AA00331m BNC-BNCCable

GRAS右耳廓 KB5002Large Right (Left mirror) Anthro. Pinna OO-35 -Exp.: XX. XX

KB5002参数Large right ear, anthropometric(mirrored left ear)

G. R.A.S. Grasgrass Denmark

GRAS KB0060KEMAR Small Right Ear Shore OO-55 - Exp.:XX. XX

GRAS 46BG

GRAS-12BE artificial head power module

GRAS 45BC Features and Performance

GRAS 45BC is a KEMAR head and torso simulator widely used for acoustic testing, particularly in measurements related to headphones, hearing aids, and other personal audio devices. The design of this simulator mimics the shape and size of a human head, providing a test that is close to the real human hearing experience. Here are some of the main features and performance characteristics of GRAS 45BC:

1. * * Realistic human body model * *: KEMAR 45BC has an optional mouth simulator that can be used to evaluate speech transmission or perform binaural recording. The entire simulator is designed to closely resemble the physical characteristics of an adult, including ears, skull, and parts of the torso.

2. * * Precision microphone * *: Built in quality measuring microphone that can accurately capture sound signals transmitted from headphones or other sound sources. These microphones typically have a wide frequency response range and a flat frequency response curve.

3. Standardization and Compatibility: GRAS 45BC follows international standards (such as IEC 60318-7) to ensure the consistency and comparability of test results. In addition, it can be integrated with other GRAS accessories and measuring devices to provide users with flexible testing solutions.

4. * * Multi purpose application * *: Suitable for various types of acoustic research and product development, including but not limited to quality control of headphones, sound field analysis, communication equipment evaluation, etc.

5. * * Durability * *: Designed to be sturdy and suitable for experimentation and on-site use. The shell material is usually chosen to be durable and not easily affected by temperature changes.

6. * * Modular design * *: allows users to customize different components based on specific needs, such as different types of ear simulators or microphones, to adapt to specific application scenarios.

7. * * Easy to operate * *: Equipped with an intuitive user interface and detailed user manual, even non professionals can quickly get started.

8. * * Calibration Services * *: GRAS provides regular calibration services to ensure that the simulator maintains excellent working condition and measurement accuracy.

9. * * Low noise amplifier * *: Equipped with high-quality amplifiers to ensure that sound signals are not subject to unnecessary interference or distortion during recording.

10. * * Software support * *: may come with dedicated software or be combined with third-party software to help users analyze data more conveniently.

For specific performance indicators and technical details, such as frequency response range, sensitivity, and high noise pressure parameters, it is recommended to refer to GRAS's technical documentation or the manufacturer for new specification information.

GRAS 45BC is an artificial head simulator mainly used for electroacoustic testing and measurement. This product belongs to the Danish GRAS (Great Audio Solutions) brand and is an important tool widely used in audio equipment development, headphone testing, communication equipment evaluation, and acoustic research.

**Product features and applications:**

-Design and Origin: The GRAS 45BC Kemar Head and torso simulator was first introduced by Knowles in 1972 and later became the standard for hearing aid manufacturers and audiologists. It is designed to mimic the acoustic characteristics of the human head and upper body, including the shape of the head, the acoustic absorption characteristics of the ears and human tissues.

-* * Mouth simulator: * * This simulator is specially equipped with a mouth simulator, which can simulate the acoustic effects when speaking. This is particularly important for testing the bidirectional communication performance of headphones with microphones, communication devices, or the accuracy of speech recognition systems.

-Modular design: GRAS 45BC has a modular structure that can be configured according to different testing needs, such as installing different types of ear simulators (such as GRAS 43BB low-noise ear simulation system) and microphones to adapt to different testing scenarios.

-Application scenarios: It is commonly used for testing the frequency response, directionality, sound leakage, and insertion loss of headphones, as well as for evaluating the speaker performance of mobile devices such as smartphones and tablets, and for verifying the performance of noise protection devices such as earplugs and headphones.

-Accuracy and Standardization: As a standard tool, GRAS 45BC provides accurate and reproducible test results that comply with multiple international standards, ensuring the reliability and universality of test data.

-Compatibility and Scalability: It can be integrated with other GRAS accessories and measuring equipment, such as using specific amplifiers and calibration devices, to optimize the performance of the entire testing system.

In summary, the GRAS 45BC artificial head simulator is a specialized testing tool that plays an irreplaceable role in ensuring the sound quality of audio products, complying with regulatory requirements, and optimizing user experience.

GRAS original 45BC artificial headGras45BC-14

Introduction

The Kemar head and torso simulator was introduced by Knowles in 1972 and quickly became the standard for ZT device manufacturers and audiologists (read article on Kemar. us). The size and acoustic performance of GRAS KEMAR are the same as the original KEMAR from 1972, with 100% backward compatibility.

According to the IEC 60318-4 standard or low noise standard, Kemar can simulate the acoustic characteristics of the human ear well when equipped with ear ear simulators, ear canal extenders, and ear simulators. Kemar, equipped with an oral simulator, also simulates human oral characteristics, making it suitable for testing communication devices that include microphones and speakers. A 45BC Kemal with a mouth simulator has the same acoustic performance as a 45BC Kemal without a mouth simulator, except for a slight opening caused by a small difference.

45BC KEMAR complies with standards such as IEC: 60318-7 and ANSI: S3.36, S3.25, and is based on ITU-T P 58.

45bb Kaima is the same, but without a mouth simulator. Read more about 45BB Kaima here.

design

Human measurement of head and torso

The main difference between KEMAR and standard commercial head and torso simulators (HATS) is that KEMAR is based on extensive statistical research on the normal human body, which means that KEMAR has the same acoustic characteristics as the normal human body, including different facial features. Therefore, it is similar to the sound diffraction encountered around the midbrain head and torso, whether in the near or far field. Due to its human body measurement shape, it is more realistic than any other human body model. Kemal is a person with varying ear to shoulder ratios, simulating the median of males and females.

GRAS45BC-11 simulator

GRAS42AE low-frequency calibrator

GRAS40GI microphone

GRAS50AI-D acoustic probe

GRAS45BC-10 simulator

GRAS45EB Keemar Earplug Positioning System

GRAS26AR amplifier

GRASAL0030 production line acoustic test

GRAS46BL measurement microphone

GRAS45BC-1 simulator

GRAS42AA sound source

GRAS45EA Mobile Positioning System

GRAS43AH Ear Cheek Simulator

GRASRA0045 simulator

GRAS26AN voltage amplifier

GRAS42AP sound source

GRAS40HF microphone

GRAS12AX power module

GRAS45CC headphone testing fixture

GRAS46AO measurement microphone

GRAS50AI-B acoustic probe

G. R.A.S. Grasgrass Denmark

GRAS Head and Shoulder Simulator 45BC-14KEMARHead&Torsow. Mouth,Anthro. Pin,Hi-Res2-ChCCPG. R.A.S. GrasgRA Denmark

GRAS右耳廓 KB5002Large Right (Left mirror) Anthro. Pinna OO-35 -Exp.: XX. XXG. R.A.S. GrasgRA Denmark

GRAS KB0060KEMAR Small Right Ear Shore OO-55 - Exp.:XX. XXG. R.A.S. GrasgRA Denmark

GRASKB0061KEMARSmallLeftEarShoreOO-55-Exp.:XX. XXG. R.A.S. GrasgRA Denmark

GRAS tripod AL0026Tripod stand for KEMARG. R.A.S. GrasgRA Denmark

GRAS4 channel microphone power supply 12AX4 Channel CCP Power ModuleG. R.A.S. GrasgRA Denmark

GRAS 10 meter BNC line AA003710mBNC-BNCCableG. R.A.S. GrasgRA Denmark

GRAS 1-meter BNC line AA00331m BNC-BNCCableG. R.A.S. GrasgRA Denmark

G. R.A.S. Denmark GRAS

G. R.A.S. Denmark G.R.A.S. 12AK parameter Mikrofon Speiser ä t 1-Kanal

with amplification, filters and SysCheck

Generator (including power supply AB0002)

GRAS 12AK

Microphone feeder 1-channel

with amplification, filters and SysCheck

Generator (including power supply AB0002)

GRAS

G. R.A.S. Grasgrass Denmark

45BC-14

KEMAR with mouth &

anthropometric ears (2-channel

CCP)

G. R.A.S. Grasgrass Denmark

KB5002

Large right ear, anthropometric

(mirrored left ear)

G. R.A.S. Grasgrass Denmark

AL0026Tripod for KEMAR

G. R.A.S. Grasgrass Denmark

12AX Microphone Feeder 4-Channel, CCP

For each channel you can choose

0dB, +20 dB or +40 dB gain

be turned on.

(including power supply)

G. R.A.S. Grasgrass Denmark

AA0037

10m BNC-BNC Kabel 50 Ohm

(RG58: 4.95 mm cross section)

GRAS quotation

GRAS

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GRAS Head and Shoulder Simulator 45BC-14KEMARHead&Torsow. Mouth,Anthro. Pin,Hi-Res2-ChCCPGRAS

GRAS右耳廓 KB5002Large Right (Left mirror) Anthro. Pinna OO-35 -Exp.: XX. XXGRAS

GRAS KB0060KEMAR Small Right Ear Shore OO-55 - Exp.:XX. XXGRAS

GRASKB0061KEMARSmallLeftEarShoreOO-55-Exp.:XX. XXGRAS

GRAS tripod AL0026Tripod stand for KEMARGRAS

GRAS4 channel microphone power supply 12AX4 Channel CCP Power ModuleGRAS

GRAS 10 meter BNC line AA003710mBNC-BNCCableGRAS

GRAS 1-meter BNC line AA00331m BNC-BNCCableGRAS

Measurement microphone GRAS-246AE frequency range: 3.15 Hz to 20 kHz dynamic range: 17 dB (A) to 138 dB sensitivity: 50mV/Pa IEC 61672 Class 1 supports SysCheck2 automatic inspection function

G.R.A.S. GRAS 45BC-14 parameters KEMAR with mouth &anthropometric ears (2-channel CCP)

GRAS 1-meter BNC line AA00331m BNC-BNCCable10 AA0033

GRAS tripod AL0026Tripod stand for KEMAR2 AL0026

46BG； 12AX； KB5002； AL0026；；；；

GRAS KB0060KEMAR Small Right Ear Shore OO-55 - Exp.:XX. XX

GRAS46AE measurement microphone

GRAS46-BD-FV measurement microphone

GRAS45BB-8 simulator

GRAS46AN measurement microphone

GRAS50AI-L sound probe

GRAS45BB-4 simulator

GRAS45CA Earphone/Hearing Protector Test Fixture

GRAS146AE measurement microphone

GRAS46BL-HT measurement microphone

GRAS40GK microphone

GRAS51AC Sound Calibration Kit

GRAS46DP-1 measuring microphone

GRAS26AI 置放大器

GRAS51AB phase calibrator

GRAS42AC sound source

GRAS40BI microphone

GRAS47DX microphone

GRAS50AI-C sound probe

GRAS50AI-LP acoustic probe

GRAS44AA simulator

GRAS12HM power module

GRAS26AJ amplifier

GRAS43AF coupler kit

GRAS40PP microphone

GRASRA0045-S1 simulator

GRAS45BB-1 simulator

GRASRA0014 electrostatic actuator

GRAS46AF measurement microphone

GRAS46BG-FV measurement microphone

GRAS46AC measurement microphone

GRAS spot spot GRAS type

G.R.A.S. GRAS40BP 1/4' Pressure Microphone Capsule, Externally Polarized

G.R.A.S. GRAS26 AB 1/4' - 1/2' Microphone Forward? rker with integrated Lemo 1B 7polG. R.A.S. GRASAA0008 3m Verl? ngerungskabel HQ Lemo 1B 7pol. - Lemo 1B 7pol.

G.R.A.S. GRAS42 AG multifunction sound calibrator- Two frequencies: 250 Hz / 1 kHz- Two levels: 94dB / 114dB- Air pressure detection, Humidity andTemperatureIncludes adapters:- RA0297 for 1/2' microphones- RA0049 for 1/4' microphones- RA0069 for 1/8' microphones

G.R.A.S. GRAS12AK microphone eater? What is Channel 1? rkung, filters and SysCheck generator (including power supply AB0002)

G. R.A.S. Denmark12AA

G. R.A.S. DenmarkAA0013

G. R.A.S. DenmarkChange: RA0020 1/2 Change: RA0020

G. R.A.S. Denmark46AC

G. R.A.S. Denmark46AE

G. R.A.S. DenmarkAA0037

G. R.A.S. DenmarkThe model is AL0006, and the supplier's quotation also includes an adapter for matching with the tripod. The model is AL0012. We will confirm with the supplier whether this is an optional or required accessory

G. R.A.S. DenmarkAL0012 adapter paired with tripod

40SC Number 40SC GRAS 40SC Number G.R.A.S. Denmark GRAS40SC Data G.R.A.S

40SC parameter Sonden Mikrofon (CCP/IEPE)

Small, compact device for

Sound pressure measurements in narrow

Rooms, under rough

Umgebungsbedingungen

and in the immediate vicinity of

Sound sources. Due to the high acoustic

Input impedance of the probe tip

the influence on the sound field

minimized. Can temperatures up to 800ºC

resist."

gras 40sc40SC

GRAS type G.R.A.S type

GRAS is an industry enterprise dedicated to the research and manufacturing of GJ degree acoustic measurement equipment, founded by acoustic expert Gunnar Rasmussen in Denmark in 1994. The company adheres to a rigorous scientific attitude and innovative spirit, committed to providing customers with J-dense, reliable, and internationally standard microphones and related measurement solutions.

GRAS has established a strong reputation in the field of acoustic measurement with its profound professional knowledge and continuous technological innovation. The company's product line covers a wide range of microphone types and supporting accessories, designed to meet the strict requirements of aerospace, automotive, consumer electronics, audiology, noise control, telecommunications, and microphone calibration. Its products not only serve the key links of product research and development, acoustic testing, and production quality management, but also provide * acoustic testing methods for scientific research institutions, education departments, and standardization organizations.

GRAS microphones are renowned for their accuracy, repeatability, and durability. To ensure product quality, the company has implemented a strict quality management system, and all products must pass a series of rigorous testing procedures, including accelerated life testing, to verify their performance stability and long-term reliability under various harsh conditions. This focus on details and persistent pursuit of quality have earned GRAS products widespread trust and praise from customers.

The GRAS category mainly includes:

Measuring microphone

Simulated Ear/Artificial Head System

Microphone amplifier

Acoustic accessories and calibration equipment

Ear Model and Hearing Protection Equipment Testing Solution

Vibration sensors and related measurement hardware

Testing software and automation solutions

These products and services aim to provide Q-position and quality technical support for applications such as acoustics, vibration measurement, and related research and development, quality control, and monitoring.

The GRAS original 45BC artificial head is a G-end audio testing device designed specifically for simulating the auditory characteristics and response of the JZ human ear. It is widely praised in the field of acoustic measurement for its superior performance, accuracy, and reliability. The following is a detailed description of the product:

Design concept and core functions

The GRAS 45BC artificial head aims to accurately reproduce the human ear's perception of sound, and its design strictly follows international standards ISO 389-7:2016 (artificial ear and ear simulator) and IEC 60318-7:2015, ensuring its Q-power and accuracy in acoustic testing. As a professional artificial head system, its core function is to simulate the acoustic characteristics of the human head and auricle, as well as the complex reflection, scattering, and absorption phenomena inside the ear canal, in order to provide accurate, objective, and reproducible auditory evaluation of various sound sources, hearing protection devices, headphones, speakers, and other audio equipment.

2、 Structure and Component Analysis

Head model: GRAS 45BC is an ergonomic head model made of G-precision polyurethane material. Its external dimensions, density distribution, and acoustic impedance have been carefully designed to simulate the impact of the human head on sound wave propagation, including reflection, refraction, and absorption effects.

Ear canal: This artificial head is equipped with a silicone ear canal that accurately simulates the shape, size, material properties, and even tiny skin texture details of the human ear canal, ensuring accurate simulation of sound wave incidence angle, frequency response, and multiple reflections inside the ear canal.

Ear canal system: The built-in GRAS 45BB 1/4 'simulated ear canal unit is one of the core components of GRAS 45BC. This unit adopts a dual tube structure, with the upper part simulating the external auditory canal and the lower part simulating the middle ear canal. It accurately replicates the length, curvature, and inner wall material characteristics of the human ear canal, and can effectively simulate the propagation process of sound waves in the ear canal and the vibration response of the eardrum.

Microphone system: Two sensitive, low-noise GRAS 40BD 1/4 'pre fabricated free field microphones are embedded at the end of the ear canal. They are directly connected to the eardrum, accurately capturing and converting into telecommunications, achieving precise measurement of sound pressure level. These two microphones have undergone strict individual calibration to ensure the consistency of the left and right channels and the reliability of the data.

3、 Technical parameters and performance advantages

Frequency response: The GRAS 45BC artificial head has excellent linear frequency response in the audio range of 20 Hz to 20 kHz, with a deviation controlled within ± 2 dB, ensuring accurate evaluation of the frequency response characteristics of various audio devices.

Sound pressure level measurement range: The built-in microphone supports a wide range of sound pressure level measurements, from as low as 18 dBSPL to 140 dBSPL, meeting various testing needs from weak noise to sound sources.

Sound source localization capability: Thanks to the J-quasi simulated ear structure, GRAS 45BC can effectively simulate the human ear's ability to distinguish the direction of sound sources, providing key data support for the evaluation of stereo systems, surround sound equipment, and sound source localization algorithms.

Stability and repeatability: The overall structure of the product is sturdy and durable, with tight coordination between various components. In addition, rigorous production processes and strict factory calibration ensure that GRAS 45BC maintains excellent stability and measurement repeatability in long-term use.

4、 Application Fields and Scenarios

The GRAS 45BC artificial head is widely used in the following fields:

Audio equipment research and quality control: used for acoustic performance testing of audio equipment such as headphones, earplugs, hearing aids, speakers, sound systems, etc., such as evaluation of key indicators such as frequency response, total harmonic distortion, sound pressure level, and sound source localization.

Assessment of hearing protection equipment: Used in labor protection products to test the noise reduction effect and wearing comfort of hearing protection equipment such as earplugs and earmuffs.

Acoustic monitoring: used in fields such as building acoustics and noise control to measure and analyze acoustic parameters such as indoor sound field distribution, reverberation time, and speech clarity.

Research and Education: In acoustic research institutions and other universities, it serves as a teaching demonstration tool and research experimental equipment to assist in the theoretical research and technological exploration of acoustics.

In summary, the GRAS original 45BC artificial head, with its accurate ear simulation, wide measurement range, excellent stability, and repeatability, has become a professional tool in the field of acoustic testing, providing strong technical support for improving audio equipment performance, ensuring hearing health, and optimizing acoustics.

GRAS46AR measurement microphone

GRAS46AP measurement microphone

GRAS40PL-1 microphone

GRAS40PP-S1 microphone

GRAS41AC-3 microphone

GRASRA0038 coupler

GRAS45BB-14 simulator

GRAS 12AX

G.R.A.S 12AX

G. R.A.S. 12AX is a performance microphone typically used in conjunction with G.R.A.S. sound meters or other sound measurement systems to achieve quality sound measurement. Here are some key functional features of G.R.A.S. 12AX:

1. Sensitivity and Wide Frequency Response: The G.R.A.S. 12AX microphone is known for its sensitivity and wide frequency response range, which enables it to accurately capture sound signals in the frequency range from low to high, making it suitable for various complex acoustic and application requirements.

2. * * Low noise characteristics: * * This microphone is designed with a low self noise level to ensure the purity of measurement results, especially in the measurement of low-level sound signals, which can provide more accurate data.

3. * * Durable: * * As a professional equipment, the G.R.A.S. 12AX microphone is made of high-quality materials that are wear-resistant and can withstand certain changes, making it suitable for long-term use in experiments and on-site settings.

4. Interoperability and Compatibility: G.R.A.S. microphones are typically designed with standardized interfaces, and 12AX is no exception, which means they can seamlessly interface with other components in the G.R.A.S. system such as amplifiers, calibrators, and adapters, making maintenance and upgrades easier.

5. * * Accurate Calibration: * * When used in conjunction with G.R.A.S.'s own calibration equipment such as the 42AG sound meter calibrator, it can ensure the accuracy and consistency of measurement results, and support regular calibration to maintain long-term measurement accuracy.

6. * * Wide application: * * G.R.A.S. 12AX is suitable for various acoustic measurement scenarios, including but not limited to sound field analysis, noise monitoring, automotive interior acoustic testing, audio equipment performance evaluation, and scientific research experiments.

7. Modular Design: G.R.A.S. products typically support modular design, and 12AX microphones may also be compatible with different types of pre fabricated units or other accessories to meet specific measurement needs.

In summary, the G.R.A.S. 12AX microphone occupies a prominent position in the field of professional acoustic measurement due to its performance, flexibility, and reliability, making it an ideal choice for precise sound measurement.

Gras42AG

G.R.A.S.42AG

G. R.A.S. 42AG is a multifunctional sound calibrator designed for rapid on-site verification of microphone and sound meter performance. It is launched as an improved alternative to the G.R.A.S. 42AB sound calibrator, with a new generation of calibration technology and the following features and advantages:

-Portability and practicality: The 42AG calibrator is designed to be compact and easy to carry, making it very suitable for on-site use. It meets the requirements for portability and intuitive operation, allowing users to quickly and accurately calibrate wherever needed.

-Multi functionality: This device is not only suitable for various types of microphones, but can also be used as a calibration tool for sound meters, making it a very flexible solution in the field of audio measurement.

-* * Usability: * * The design of 42AG emphasizes usability, with a user-friendly interface that makes the calibration process simple and fast, making it easy for even non professionals to operate.

-* * Accuracy and Reliability: * * G.R.A.S., as a brand in the field of acoustic measurement, is renowned for its products' accuracy and stability. The 42AG calibrator also ensures the accuracy of horizontal measurement, ensuring the consistency and reliability of test results.

-* * Standard Compatibility: * * This calibrator complies with relevant international standards, ensuring that it follows recognized specifications during the calibration process, making the measurement results comparable and acceptable within * range.

-* * Scope of application: * * Suitable for noise monitoring, occupational health and safety assessment, audio equipment development, acoustic experiments, and any occasions that require precise sound measurement.

Overall, G.R.A.S. 42AG is a tool designed specifically to improve the efficiency and accuracy of sound measurement. Its launch has enriched G.R.A.S.'s solutions in the field of acoustic measurement, providing users with efficient and reliable calibration options.

Gras42AG

G.R.A.S.42AG

GrasKEMAR calibrator 42AG

Introduction to GRAS original 45BC artificial head

G. Introduction to R.A.S. Original 45BC Artificial Head

G. R.A.S. Denmark G.R.A.S. Denmark GRAS Denmark

GRAS 45BC is a human foreman simulator mainly used for electroacoustic testing and measurement. This product belongs to the Danish GRAS (Great Audio Solutions) brand and is an important tool widely used in audio equipment development, headphone testing, communication equipment evaluation, and acoustic research.

**Product features and applications:**

-Design and Origin: The GRAS 45BC Kemar Head and torso simulator was first introduced by Knowles in 1972 and later became the standard for hearing aid manufacturers and audiologists. It is designed to mimic the acoustic characteristics of the human head and upper body, including the shape of the head, the acoustic absorption characteristics of the ears and human tissues.

-* * Mouth simulator: * * This simulator is specially equipped with a mouth simulator, which can simulate the acoustic effects when speaking. This is particularly important for testing the bidirectional communication performance of headphones with microphones, communication devices, or the accuracy of speech recognition systems.

-Modular design: GRAS 45BC has a modular structure that can be configured according to different testing needs, such as installing different types of ear simulators (such as GRAS 43BB low-noise ear simulation system) and microphones to adapt to different testing scenarios.

-Application scenarios: It is commonly used for testing the frequency response, directionality, sound leakage, and insertion loss of headphones, as well as for evaluating the speaker performance of mobile devices such as smartphones and tablets, and for verifying the performance of noise protection devices such as earplugs and headphones.

-Accuracy and Standardization: As a standard tool, GRAS 45BC provides accurate and reproducible test results that comply with multiple international standards, ensuring the reliability and universality of test data.

-Compatibility and Scalability: It can be integrated with other GRAS accessories and measuring equipment, such as using specific amplifiers and calibration devices, to optimize the performance of the entire testing system.

In summary, the GRAS 45BC artificial head simulator is a specialized testing tool that plays an irreplaceable role in ensuring the sound quality of audio products, complying with regulatory requirements, and optimizing user experience.

GrasKEMAR calibrator 42AG

Introduction to GRAS original 45BC artificial head

G. Introduction to R.A.S. Original 45BC Artificial Head

G. R.A.S. Denmark G.R.A.S. Denmark GRAS Denmark

GRAS/Denmark

G. R.A.S. Denmark G.R.A.S. Denmark GRAS Denmark

Gras12AX KEMAR power supply 12AX GRAS 12AX G.R.A.S12AX

GRAS 12AX is a special purpose acoustic sensor produced by GRAS Sound&Vibration - Pressure Field Equalizer (PFE). It is not a traditional microphone, but an auxiliary device used to improve the uniformity of pressure fields in acoustic testing. The following are the main features of GRAS 12AX:

Pressure field equalization function: GRAS 12AX is designed to improve the pressure field distribution around the sound source in acoustic testing, such as in anechoic or semi anechoic environments, making it closer to ideal free field conditions. This is crucial for measuring the acoustic characteristics of sound sources such as speakers, headphones, and earphones, especially when precise sound source localization and sound power measurement are required.

Design: 12AX adopts an open grid structure with multiple small sound holes embedded inside. These sound holes are arranged in a specific layout to effectively disperse and balance sound wave energy, reducing pressure field non-uniformity caused by boundary effects such as ground reflection, wall reflection, etc.

Easy to install: GRAS 12AX is usually equipped with mounting brackets that can be easily fixed under or around the sound source, adjusted to the appropriate degree and to adapt to different testing settings. Its lightweight design does not impose any additional burden on the sound source or testing rack.

Good compatibility: Although not involved in sound pressure measurement, GRAS 12AX, as an important component of acoustic testing, works together with various microphones from GRAS or other brands (such as GRAS 42AG mentioned above) and acoustic testing equipment to form a complete acoustic measurement system.

Improving measurement accuracy: By using the GRAS 12AX pressure field equalizer, measurements caused by non-uniform pressure fields can be reduced to a certain extent, improving the accuracy and consistency of directional, frequency response curve, sound power and other parameter measurements of sound sources such as speakers and headphones.

In summary, GRAS 12AX is a pressure field equalizer designed specifically to improve the uniformity of pressure fields in acoustic testing. It effectively disperses sound wave energy through structural design, helping to improve the accuracy and consistency of sound source characteristic measurements such as speakers and headphones. It is an ideal auxiliary device for precision acoustic testing in acoustic experiments.

GRAS 42AG G. R.A.S42AG

GRAS 42AG is a 1/4-inch pre normalized free field standard microphone set designed specifically for acoustic experiments and field testing, with performance, accuracy, and stability, suitable for various precision acoustic measurement applications.

Accuracy measurement: The GRAS 42AG microphone kit is designed for precise and reproducible acoustic measurements, suitable for various acoustic experiments and on-site testing. It has excellent linear frequency response and low self noise, ensuring accurate sound pressure measurement results over a wide frequency range (typically 20 Hz to 20 kHz).

Pre design: Using a built-in electric resident membrane as the sensor, without the need for external power supply, simplifies system configuration, and improves convenience and stability of use.

1/4 inch free field standard type: The 42AG microphone complies with the 1/4 inch free field standard size specified in IEC 61094-4 and is suitable for measuring sound pressure in non reflective or diffuse sound fields. This specification is particularly suitable for applications such as sound source localization and sound power measurement in soundproof, semi soundproof, or outdoor open spaces.

Sensitivity: It has a high sound pressure sensitivity (usually between -26 dB and -38 dB (re. 1 V/Pa)), which can capture weak sound signals and is suitable for precision acoustic research and quality control that require signal-to-noise ratio.

Stable and durable: The microphone housing is made of high-quality stainless steel material, which has good mechanical stability and corrosion resistance, and can maintain long-term stable operation in various environments. The internal components undergo strict quality control and calibration to ensure long-term reliability.

Complete set of accessories: The set usually includes a microphone body, a specific length of quality coaxial cable, a windproof cover, a calibration certificate, and possible adapters or adapters, providing users with a plug and play complete measurement solution.

Versatile: GRAS microphones are often used in conjunction with various third measurement devices such as sound meters, audio analyzers, and data acquisition systems, making them easy to integrate into existing testing.

Traceable calibration: Each GRAS 42AG microphone comes with a detailed calibration certificate, and the calibration data is based on experimental standards to ensure the accuracy and traceability of measurement results. Users should regularly recalibrate at recommended intervals to maintain the accuracy of the measurement system.

In summary, GRAS 42AG is a 1/4-inch pre fabricated free field standard microphone set designed specifically for acoustic experiments and on-site testing, with performance, accuracy, and stability, suitable for various precision acoustic measurement applications.

Gras'KEMARHeadTorso

The specification is 45BC-14 '

GrasKEMAR power supply 12AX

GrasKEMAR calibrator 42AG

Gras 45BC-14

GRAS original 45BC artificial head description

GRAS type G.R.A.S type

43AC

46DD-FV

40HH

12HF

44AA 10-100KHZ 200HZ-5KZH<1.5% 8Ω

44AA 10-100KHZ 200HZ-5KZH<1.5% 8Ω

规格 GRAS 40LS 1/4' CCP Precision Surface Microphone,20m cable，5 - 70K。

GRAS type G.R.A.S type

GRAS G.R.A.S. Denmark GRAS microphone 'microphone parameters

GRAS 46BE， Please refer to the attachment for the specification sheet. A 46BE GRAS AA0073-CL2000, 20 meter microdot to BNC cable is required

GRAS G.R.A.S. Denmark GRAS microphone AA0145 parameter 20m Kabel Microdot - BNC46BE 20 meter cable accessory corresponding to type AA0145 requires GRAS AA0073-CL2000, 20 meter Microdot to BNC cable

G.R.A.S. GRAS40BP 1/4' Pressure Microphone Capsule, Externally Polarized

G.R.A.S. GRAS26 AB 1/4' - 1/2' Microphone Forward? rker with integrated Lemo 1B 7polG. R.A.S. GRASAA0008 3m Verl? cable HQ Lemo 1B 7pol. - I read 1B 7in.

G.R.A.S. GRAS42 AG multifunction sound calibrator- Two frequencies: 250 Hz / 1 kHz- Two levels: 94dB / 114dB- Air pressure detection, Humidity andTemperatureIncludes adapters:- RA0297 for 1/2' microphones- RA0049 for 1/4' microphones- RA0069 for 1/8' microphones

G.R.A.S. GRAS12AK microphone feeder? What is Channel 1? rkung, filters and SysCheck generator (including power supply AB0002)

G. R.A.S. Denmark 12AA

G. R.A.S. Denmark AA0013

G. R.A.S. Denmark Change: RA0020 1/2 Change: RA0020

G. R.A.S. Denmark 46AC

G. R.A.S. Denmark 46AE

G. R.A.S. Denmark AA0037

G. The R.A.S. Danish model is AL0006, and the supplier's quotation also includes an adapter for matching with the tripod, model AL0012. We will confirm with the supplier whether this is an optional or mandatory accessory

G. R.A.S. Denmark AL0012 adapter for tripod pairing

40SC Number 40SC GRAS 40SC Number G.R.A.S. Denmark GRAS40SC Data G.R.A.S

40SC parameter Sonden Mikrofon (CCP/IEPE)

Small, compact device for

Sound pressure measurements in narrow

Rooms, under rough

Umgebungsbedingungen

and in the immediate vicinity of

Sound sources. Due to the high acoustic

Input impedance of the probe tip

the influence on the sound field

minimized. Can temperatures up to 800ºC

resist."

gras 40sc40SC

GRAS type G.R.A.S type

GRAS is an industry enterprise dedicated to the research and manufacturing of GJ degree acoustic measurement equipment, founded by acoustic expert Gunnar Rasmussen in Denmark in 1994. Adhering to a rigorous scientific attitude and innovative spirit, we are committed to providing our customers with reliable and internationally standardized microphone and related measurement solutions.

GRAS has established a strong reputation in the field of acoustic measurement with its profound professional knowledge and continuous technological innovation. The product line covers a wide range of microphone types and supporting accessories, designed to meet the strict requirements of aerospace, automotive, consumer electronics, audiology, noise control, telecommunications, and microphone calibration. Its products not only serve the key links of product research and development, acoustic testing, and production quality management, but also provide excellent acoustic testing methods for scientific research institutions, education departments, and standardization organizations.

GRAS microphones are renowned for their accuracy, repeatability, and durability. To ensure product quality, a strict quality management system has been implemented, and all products must undergo a series of rigorous testing procedures, including accelerated life testing, to verify their performance stability and long-term reliability under various harsh conditions. This focus on details and persistent pursuit of quality have earned GRAS products widespread trust and praise from customers.

The GRAS category mainly includes:

Measuring microphone

Simulated Ear/Artificial Head System

Microphone amplifier

Acoustic accessories and calibration equipment

Ear Model and Hearing Protection Equipment Testing Solution

Vibration sensors and related measurement hardware

Testing software and automation solutions

These products and services are designed to provide technical support for Q position and quality in applications such as acoustics, vibration measurement, and related research and development, quality control, and monitoring.

The GRAS original 45BC artificial head is a G-end audio testing device designed specifically for simulating the auditory characteristics and response of the JZ human ear. It is widely praised in the field of acoustic measurement for its superior performance, accuracy, and reliability. The following is a detailed description of the product:

Design concept and core functions

The GRAS 45BC artificial head aims to accurately reproduce the human ear's perception of sound, and its design strictly follows international standards ISO 389-7:2016 (artificial ear and ear simulator) and IEC 60318-7:2015, ensuring its Q-power and accuracy in acoustic testing. As a professional artificial head system, its core function is to simulate the acoustic characteristics of the human head and auricle, as well as the complex reflection, scattering, and absorption phenomena inside the ear canal, in order to accurately, objectively, and repeatedly evaluate the auditory perception of various sound sources, hearing protection devices, headphones, speakers, and other audio equipment.

2、 Structure and Component Analysis

Head model: GRAS 45BC is an ergonomic head model made of G-precision polyurethane material. Its external dimensions, density distribution, and acoustic impedance have been carefully designed to simulate the impact of the human head on sound wave propagation, including reflection, refraction, and absorption effects.

Ear canal: This artificial head is equipped with a silicone ear canal that accurately simulates the shape, size, material properties, and even tiny skin texture details of the human ear canal, ensuring accurate simulation of sound wave incidence angle, frequency response, and multiple reflections inside the ear canal.

Ear canal system: The built-in GRAS 45BB 1/4 'simulated ear canal unit is one of the core components of GRAS 45BC. This unit adopts a dual tube structure, with the upper part simulating the external auditory canal and the lower part simulating the middle ear canal. It accurately replicates the length, curvature, and inner wall material characteristics of the human ear canal, and can effectively simulate the propagation process of sound waves in the ear canal and the vibration response of the eardrum.

Microphone system: Two sensitive, low-noise GRAS 40BD 1/4 'pre fabricated free field microphones are embedded at the end of the ear canal, which are docked with the eardrum to accurately capture and convert into telecommunications, achieving precise measurement of sound pressure. These two microphones have undergone strict individual calibration to ensure the consistency of the left and right channels and the reliability of the data.

3、 Technical parameters and performance advantages

Frequency response: The GRAS 45BC artificial head has excellent linear frequency response in the audio range of 20 Hz to 20 kHz, with a deviation controlled within ± 2 dB, ensuring accurate evaluation of the frequency response characteristics of various audio devices.

Sound pressure measurement range: The built-in microphone supports a wide range of sound pressure measurement, from as low as 18 dBSPL to 140 dBSPL, meeting various testing needs from weak noise to sound sources.

Sound source localization capability: Thanks to the J-quasi simulated ear structure, GRAS 45BC can effectively simulate the human ear's ability to distinguish the direction of sound sources, providing key data support for the evaluation of stereo systems, surround sound equipment, and sound source localization algorithms.

Stability and repeatability: The overall structure of the product is sturdy and durable, with tight coordination between various components. In addition, rigorous production processes and strict calibration ensure that GRAS 45BC maintains excellent stability and G repeatability of measurement results during long-term use.

4、 Application Fields and Scenarios

The GRAS 45BC artificial head is widely used in the following fields:

Audio equipment research and quality control: used for acoustic performance testing of audio equipment such as headphones, earplugs, hearing aids, speakers, sound systems, etc., such as evaluation of key indicators such as frequency response, total harmonic distortion, sound pressure, and sound source localization.

Assessment of hearing protection equipment: Used in labor protection products to test the noise reduction effect and wearing comfort of hearing protection equipment such as earplugs and earmuffs.

Acoustic monitoring: used in fields such as building acoustics and noise control to measure and analyze acoustic parameters such as internal sound field distribution, reverberation time, and speech clarity.

Research and Education: In acoustic research institutions and other universities, it serves as a teaching demonstration tool and research experimental equipment to assist in the theoretical research and technological exploration of acoustics.

In summary, the GRAS original 45BC artificial head, with its accurate ear simulation, wide measurement range, excellent stability and repeatability, has become a professional tool in the field of acoustic testing, providing strong technical support for improving audio equipment performance, ensuring hearing health, and optimizing acoustics.

GRAS45CB Acoustic Testing Fixture

GRAS40AC Measurement Microphone Box

GRAS26AH amplifier

GRAS47HC microphone

GRAS50GI-R acoustic probe

GRAS67TS turbulent sieve tube

GRASRA0057 simulator

GRAS45BC simulator

GRAS46BD-S1 measuring microphone

GRAS46BF-1 measuring microphone

GRAS40BD-FV measurement microphone box

GRAS40BE-FV measurement microphone box

GRAS26CS amplifier

GRAS47BX microphone

GRAS12AU power module

GRAS45BB-10 simulator

GRAS45BB-5 simulator

GRAS45BB-6 simulator

GRAS42AG multifunctional audio calibrator

GRAS40AK microphone

GRASRA0056 simulator

GRAS12HF power module

GRAS45BB-12 simulator

GRAS45BB-9 simulator

GRAS46DD measurement microphone

GRAS26AC-1 amplifier

GRAS26CA amplifier

GRAS26HG amplifier

GRAS67AX microphone

GRAS12AG power module

GRAS12AN power module

G. R.A.S. Denmark GRAS

G. R.A.S. Denmark GrasGRAS

GRAS Good GRAS Advantage GRAS Original

参数Artikel Nr. 46BG

1 / 4 'druck-mikfonset, CCP / IEPE

(microscope)

High level.

Microphone set consisting of

pre-polarized 1/4' print microphone

40BG and 1/4' CCP Preamplifier 26CB

with integrated TEDS chip and

Microdot plug.

G. R.A.S. Denmark GrasGRAS

46BG (60-184DB) accuracy 1DB microphone+amplifier quantity 2

46 BG ʻŌصة झील प्षिout; Artikel Nr. 46 BG

1 / 4 'druck-mikfonset, CCP / IEPE

(microscope)

High level.

Microphone set consisting of

pre-polarized 1/4' print microphone

40BG and 1/4' CCP Preamplifier 26CB

with integrated TEDS chip and

Microdot plug.

G. R.A.S. Denmark GrasGRAS

GRAS Good GRAS Advantage GRAS Original

G. R.A.S. Denmark GRAS

Artificial head usageArtificial head sound cardRS1288

Artificial Head AmplifierPA4000

Artificial head lifting platformHD600

Calibration of artificial head and mouthRST1000

Artificial head and ear calibrationC001 calibrator and adapter AD300

Master System SoftwareSound playback and wake-up software

Speaker and bracketAM6102Two way intelligent fidelity speaker and supporting bracket

Low frequency speakerAM6201bass speaker

Test wireCK400AUsed for on-site product connectionGRAS

46AE46AE

1/2' Freefield Microphone Set, CCP/IEPE

(BNC)

G. R.A.S. Denmark GRAS

45BC-14 artificial head \ GRAS45BC-14

45BC-14 Artificial Head \ \ GRAS

G. R.A.S. Denmark GRAS

45BC-14 Artificial Head \ \ GRAS45BC-1445BC-14 Artificial Head Parameters

KEMAR with mouth &

anthropometric ears (2-channel

CCP)

Includes:

- 1 x KEMAR head with mouth simulator &

Torso 45BC, unconfigured

- 1 x Large right ear KB5000,

anthropometrisch (35 Shore OO)

- 1 x Large left ear KB5001,

anthropometrisch (35 Shore OO)

- 2 x Pre-polarized high-resolution

Ohrsimulator Typ RA0402 (IEC 60318-4)

- 2 x Ohrsimulator-Halter GR1874

- 2 x external ear canal GR0408 (for

calibration)

- 2 x Overhead nut GR0409 (for

GR0408)

- 2 x 1/4' preamplifier 26CS, short, with

Mikdotstecker

- 2 x rectangular adapter RA0001 for

1/2' microphone and 1/4' preamp

- 2 x Mikrodot-BNC Kabel AA0018-S (35

cm)

- 2 x BNC-BNC Kabel AA0035 (3 m)

Some brands:GRASGRAS in stockGRAS type homogeneousGRAS is good

Burkert Baode EPRO; ASCO，topworx ， Asca, GRAS; HYDAC, THALES; HAWE, Rexroth, HBM, NASON, Nathan, EATON VICKERS, Eaton Wiggs, Parker PARKER, Maxon, microsonic, ZIEHL-ABEGG AirCom, STEGO, BAUMER, Binsack, St ä ubli, St ä ubli, Schneider, APV, Square D,

Audio Precision, RANSBURG, BRONKHARST, HAUG, AB, ABB, Camozzi Camozzi, Carlo Gavazzi Jiale, Jeffrey GEFRAN, SUN, MAC, ATOS Atos, SICK Shik, BANNER Bonner, UE, MOOG Mug, MTS, NUMATIC Newman Tik, ROSS , Rosemount, COAX, HEIDENHAIN, E+H Endhouse, FESTO Festo, NORGREN, IFM, P+F, PILZ, Phoenix, Siemens, DESTACO Fairchild; NOVOTECHNIK , VEGA, AMETEK, Hengstler, KUBLER, MTS, Lechler, Deunlin, Copeland (valves), Northstar (probes), YNAI (cylinders), Airtrol (switches), Kemraft (car steering wheels), Autoflow (flow switches), Wotek Votech filters, Nugent filters, HLCO filters, Air port cylinders. SCHUNK cylinder, clamp Italian ELCIS WEBER

LENORD+BAUER HYDAC pressure relay, temperature relay, accumulator, etc

WEIGEL FRIZLEN TIPPKEMPER MATRIX TWK, WEIGEL WEIGEL, ELCIS ISIS, FRIZLEN FREEN, and more!

SMC from Japan, CKD from Japan, YUKEN from Japan Oil Research, NACHI from Japan, Seiko Kuroda from Japan, TOYOOKI from Japan, DAIKIN from Daikin from Japan, TOJIMI from Japan, TAIYO from Nippon Steel

GRAS 42AG G. R.A.S42AG

Gras'KEMARHeadTorso

The specification is 45BC-14 '

GrasKEMAR power supply 12AX

GrasKEMAR calibrator 42AG

Gras 45BC-14

GRAS original 45BC artificial head description

GRAS type G.R.A.S type

43AC

46DD-FV

40HH

12HF

44AA 10-100KHZ 200HZ-5KZH<1.5% 8Ω

44AA 10-100KHZ 200HZ-5KZH<1.5% 8Ω

规格 GRAS 40LS 1/4' CCP Precision Surface Microphone,20m cable，5 - 70K。

GRAS type G.R.A.S type

GRAS G.R.A.S. Denmark GRAS microphone 'microphone parameters

GRAS 46BE， Please refer to the attachment for the specification sheet. A 46BE GRAS AA0073-CL2000, 20 meter microdot to BNC cable is required

GRAS G.R.A.S. Denmark GRAS microphone AA0145 parameter 20m Kabel Microdot - BNC46BE 20 meter cable accessory corresponding to type AA0145 requires GRAS AA0073-CL2000, 20 meter Microdot to BNC cable

G.R.A.S. GRAS40BP 1/4' Pressure Microphone Capsule, Externally Polarized

G.R.A.S. GRAS26 AB 1/4' - 1/2' Microphone Forward? rker with integrated Lemo 1B 7polG. R.A.S. GRASAA0008 3m Verl? cable HQ Lemo 1B 7pol. - I read 1B 7in.

G.R.A.S. GRAS42 AG multifunction sound calibrator- Two frequencies: 250 Hz / 1 kHz- Two levels: 94dB / 114dB- Air pressure detection, Humidity andTemperatureIncludes adapters:- RA0297 for 1/2' microphones- RA0049 for 1/4' microphones- RA0069 for 1/8' microphones

G.R.A.S. GRAS12AK microphone feeder? What is Channel 1? rkung, filters and SysCheck generator (including power supply AB0002)

G. R.A.S. Denmark 12AA

G. R.A.S. Denmark AA0013

G. R.A.S. Denmark Change: RA0020 1/2 Change: RA0020

G. R.A.S. Denmark 46AC

G. R.A.S. Denmark 46AE

G. R.A.S. Denmark AA0037

G. The R.A.S. Danish model is AL0006, and the supplier's quotation also includes an adapter for matching with the tripod, model AL0012. We will confirm with the supplier whether this is an optional or mandatory accessory

G. R.A.S. Denmark AL0012 adapter for tripod pairing

40SC Number 40SC GRAS 40SC Number G.R.A.S. Denmark GRAS40SC Data G.R.A.S

40SC parameter Sonden Mikrofon (CCP/IEPE)

Small, compact device for

Sound pressure measurements in narrow

Rooms, under rough

Umgebungsbedingungen

and in the immediate vicinity of

Sound sources. Due to the high acoustic

Input impedance of the probe tip

the influence on the sound field

minimized. Can temperatures up to 800ºC

resist."

gras 40sc40SC

GRAS type G.R.A.S type

GRAS is an industry enterprise dedicated to the research and manufacturing of GJ degree acoustic measurement equipment, founded by acoustic expert Gunnar Rasmussen in Denmark in 1994. Adhering to a rigorous scientific attitude and innovative spirit, we are committed to providing our customers with reliable and internationally standardized microphone and related measurement solutions.

GRAS has established a strong reputation in the field of acoustic measurement with its profound professional knowledge and continuous technological innovation. The product line covers a wide range of microphone types and supporting accessories, designed to meet the strict requirements of aerospace, automotive, consumer electronics, audiology, noise control, telecommunications, and microphone calibration. Its products not only serve the key links of product research and development, acoustic testing, and production quality management, but also provide excellent acoustic testing methods for scientific research institutions, education departments, and standardization organizations.

GRAS microphones are renowned for their accuracy, repeatability, and durability. To ensure product quality, a strict quality management system has been implemented, and all products must undergo a series of rigorous testing procedures, including accelerated life testing, to verify their performance stability and long-term reliability under various harsh conditions. This focus on details and persistent pursuit of quality have earned GRAS products widespread trust and praise from customers.

The GRAS category mainly includes:

Measuring microphone

Simulated Ear/Artificial Head System

Microphone amplifier

Acoustic accessories and calibration equipment

Ear Model and Hearing Protection Equipment Testing Solution

Vibration sensors and related measurement hardware

Testing software and automation solutions

These products and services are designed to provide technical support for Q position and quality in applications such as acoustics, vibration measurement, and related research and development, quality control, and monitoring.

The GRAS original 45BC artificial head is a G-end audio testing device designed specifically for simulating the auditory characteristics and response of the JZ human ear. It is widely praised in the field of acoustic measurement for its superior performance, accuracy, and reliability. The following is a detailed description of the product:

Design concept and core functions

The GRAS 45BC artificial head aims to accurately reproduce the human ear's perception of sound, and its design strictly follows international standards ISO 389-7:2016 (artificial ear and ear simulator) and IEC 60318-7:2015, ensuring its Q-power and accuracy in acoustic testing. As a professional artificial head system, its core function is to simulate the acoustic characteristics of the human head and auricle, as well as the complex reflection, scattering, and absorption phenomena inside the ear canal, in order to accurately, objectively, and repeatedly evaluate the auditory perception of various sound sources, hearing protection devices, headphones, speakers, and other audio equipment.

2、 Structure and Component Analysis

Head model: GRAS 45BC is an ergonomic head model made of G-precision polyurethane material. Its external dimensions, density distribution, and acoustic impedance have been carefully designed to simulate the impact of the human head on sound wave propagation, including reflection, refraction, and absorption effects.

Ear canal: This artificial head is equipped with a silicone ear canal that accurately simulates the shape, size, material properties, and even tiny skin texture details of the human ear canal, ensuring accurate simulation of sound wave incidence angle, frequency response, and multiple reflections inside the ear canal.

Ear canal system: The built-in GRAS 45BB 1/4 'simulated ear canal unit is one of the core components of GRAS 45BC. This unit adopts a dual tube structure, with the upper part simulating the external auditory canal and the lower part simulating the middle ear canal. It accurately replicates the length, curvature, and inner wall material characteristics of the human ear canal, and can effectively simulate the propagation process of sound waves in the ear canal and the vibration response of the eardrum.

Microphone system: Two sensitive, low-noise GRAS 40BD 1/4 'pre fabricated free field microphones are embedded at the end of the ear canal, which are docked with the eardrum to accurately capture and convert into telecommunications, achieving precise measurement of sound pressure. These two microphones have undergone strict individual calibration to ensure the consistency of the left and right channels and the reliability of the data.

3、 Technical parameters and performance advantages

Frequency response: The GRAS 45BC artificial head has excellent linear frequency response in the audio range of 20 Hz to 20 kHz, with a deviation controlled within ± 2 dB, ensuring accurate evaluation of the frequency response characteristics of various audio devices.

Sound pressure measurement range: The built-in microphone supports a wide range of sound pressure measurement, from as low as 18 dBSPL to 140 dBSPL, meeting various testing needs from weak noise to sound sources.

Sound source localization capability: Thanks to the J-quasi simulated ear structure, GRAS 45BC can effectively simulate the human ear's ability to distinguish the direction of sound sources, providing key data support for the evaluation of stereo systems, surround sound equipment, and sound source localization algorithms.

Stability and repeatability: The overall structure of the product is sturdy and durable, with tight coordination between various components. In addition, rigorous production processes and strict calibration ensure that GRAS 45BC maintains excellent stability and G repeatability of measurement results during long-term use.

4、 Application Fields and Scenarios

The GRAS 45BC artificial head is widely used in the following fields:

Audio equipment research and quality control: used for acoustic performance testing of audio equipment such as headphones, earplugs, hearing aids, speakers, sound systems, etc., such as evaluation of key indicators such as frequency response, total harmonic distortion, sound pressure, and sound source localization.

Assessment of hearing protection equipment: Used in labor protection products to test the noise reduction effect and wearing comfort of hearing protection equipment such as earplugs and earmuffs.

Acoustic monitoring: used in fields such as building acoustics and noise control to measure and analyze acoustic parameters such as internal sound field distribution, reverberation time, and speech clarity.

Research and Education: In acoustic research institutions and other universities, it serves as a teaching demonstration tool and research experimental equipment to assist in the theoretical research and technological exploration of acoustics.

In summary, the GRAS original 45BC artificial head, with its accurate ear simulation, wide measurement range, excellent stability and repeatability, has become a professional tool in the field of acoustic testing, providing strong technical support for improving audio equipment performance, ensuring hearing health, and optimizing acoustics.

EPRO; Burkert, Rexroth, HYDAC, GRAS, SENSIT, Carlo Gavazzi; EGE； TREK； HAWE HAWE, NASON NASON, VICKERS WEIGS, Parker PARKER, ATOS ATOS, TOPWORX, Camozzi Camozzi, abundant microsonic in stock, KUBLER KUBORO, JEFEN GEFRAN, SUN, MAC, SICK SCHK, ASCO Asca, HBM, BAUMER Alliance, MOOG Mug, BANNER BANNA, GF; UE, SUN, NUMATICS Newman Tik, ROSS, COAX, HEIDENHAIN Heidenhain, JUMO Jiumao, E+H Endershause, FESTO Festo, NORGREN Norguan, IFM Yifumen, P+F, PILZ, ACE, Siemens, EMP, TWK, DESTACO, Fairchild, NOVOTECHNIK, VEGA, Hengstler, THALES, Honsberg, TESCOM; Milton Roy; KNF Kaienfu;; KOBOLD Kebao; SAMSON Samson; KYTOLA ； Speek SPECK; Anshengneng Euchner; WANDFLUH Wanfule; AI-TEK; AZBIL Shanwu; FAG Mahle; SKF SKF; SOR Saul; Barksdale Bus; MIDLAND-ACS； REDLION； Wenglor Weigler; ZIEHL-ABEGG Xerox Bai; SKYWISH ; Puls Purse; di-soric ; Stäubli; PULSOTRONIC; AirCom; STEGO; Binsack; KTB; Square D; Audio Precision； RANSBURG； Maxon；

， Audio Precision, RANSBURG, BRONKHARST, HAUG HAUG, Rosemount Rosemount, Phoenix, Lechler, Deunlin, Copeland (valves), Northstar (probes), YNAI (cylinders), Airtrol (switches) Kemraft (car steering wheel), Autoflow (flow switches) Votech filters, Nugent filters, HLCO filters, Air port cylinders. SCHUNK cylinder, clamp Italian ELCIS WEBER WEIGEL FRIZLEN TIPPKEMPER MATRIX TWK, WEIGEL WEIGER, ELCIS ISIS, FRIZLEN FRIZLEN; AIRTAC; SMC, CKD, YUKEN, NACHI, TOYOOKI, Daikin DAIKIN, TAIYO

G. R.A.S has arrived. Gras is good, GRAS is short

G.R.A.S. 46AE

G.R.A.S. is a Danish company specializing in the production of high-quality acoustic measurement equipment and microphones. The '46AE' is a 1/4 inch pre fabricated free field microphone produced by G.R.A.S. This microphone is designed for precision acoustic measurement and is commonly used in fields such as noise monitoring, product noise testing, and research.

Features include:

-Wide frequency range, suitable for various measurement needs.

-Stability ensures the consistency of long-term measurements.

-Pre designed for easy use and maintenance.

-Compact and lightweight, easy to install and carry.

G. R.A.S. original

Gras, good

GRAS is relatively short

Many customers make transactions and repeat purchases

Danish G.R.A.S. amplifiers, G.R.A.S. microphones, G.R.A.S. sound calibrators and other products have accumulated valuable experience in serving China's industrial automation.

G. R.A.S.'s products are widely used in aerospace, automotive, audiology and other fields.

G. R.A.S. original

Gras arrived

GRAS

42AG

46AE

The GRAS 42AG multifunctional sound calibrator is a portable, battery powered sound source designed for rapid on-site verification of microphones and sound meters. This is a Class 1 sound calibrator, and GRAS 42AG has become an important tool for ensuring repeatable measurements.

GRAS 42AG is a 1/4-inch pre normalized free field standard microphone set designed specifically for acoustic experiments and on-site testing, with performance, accuracy, and stability. It is suitable for various precision acoustic measurement applications

G. R.A.S. Denmark GRAS

46AE46AE

1/2' Freefield Microphone Set, CCP/IEPE

(BNC)

G. R.A.S. Denmark GRAS

45BC-14 artificial head \ GRAS45BC-14

45BC-14 Artificial Head \ \ GRAS

G. R.A.S. Denmark GRAS

45BC-14 Artificial Head \ \ GRAS45BC-1445BC-14 Artificial Head Parameters

KEMAR with mouth &

anthropometric ears (2-channel

CCP)

Includes:

- 1 x KEMAR head with mouth simulator &

Torso 45BC, unconfigured

- 1 x Large right ear KB5000,

anthropometrisch (35 Shore OO)

- 1 x Large left ear KB5001,

anthropometrisch (35 Shore OO)

- 2 x Pre-polarized high-resolution

Ohrsimulator Typ RA0402 (IEC 60318-4)

- 2 x Ohrsimulator-Halter GR1874

- 2 x external ear canal GR0408 (for

calibration)

- 2 x Overhead nut GR0409 (for

GR0408)

- 2 x 1/4' preamplifier 26CS, short, with

Mikdotstecker

- 2 x rectangular adapter RA0001 for

1/2' microphone and 1/4' preamp

- 2 x Mikrodot-BNC Kabel AA0018-S (35

cm)

- 2 x BNC-BNC Kabel AA0035 (3 m)

G. R.A.S. Denmark GRAS Power Supply 12BEG. R.A.S. Denmark

12BE参数CCP Microphone feeder 2-channel with TEDS support

Gras12AX

12AX Parameters Microphone Feeder 4-Channel, CCP

For each channel you can choose

0dB, +20 dB or +40 dB gain

be turned on.

(including power supply)

46AE parameter 1/2 'Freifeld Mikrofonset, CCP/IEPE (BNC)

12BB Parameters CCP Microphone Feeder 4-Channel MIT TEDS Support

40PH-10

46BE parameter 11/4 'Freifeld Mikrofonset, CCP/IEPE

(microscope)

Microphone set consisting of

pre-polarized 1/4' free-field microphone

40BE and 1/4' CCP Preamplifier 26CB

with integrated TEDS chip and

Microdot connection

Distribute the following products:

EPRO; Burkert, Rexroth, HYDAC, GRAS, SENSIT, Carlo Gavazzi; EGE； TREK； HAWE HAWE, NASON NASON, VICKERS WEIGS, Parker PARKER, ATOS ATOS, TOPWORX, Camozzi Camozzi, abundant microsonic in stock, KUBLER KUBORO, JEFEN GEFRAN, SUN, MAC, SICK SCHK, ASCO Asca, HBM, BAUMER Alliance, MOOG Mug, BANNER BANNA, GF; UE, SUN, NUMATICS Newman Tik, ROSS, COAX, HEIDENHAIN Heidenhain, JUMO Jiumao, E+H Endershause, FESTO Festo, NORGREN Norguan, IFM Yifumen, P+F, PILZ, ACE, Siemens, EMP, TWK, DESTACO, Fairchild, NOVOTECHNIK, VEGA, Hengstler, THALES, Honsberg, TESCOM; Milton Roy; KNF Kaienfu;; KOBOLD Kebao; SAMSON Samson; KYTOLA ； Speek SPECK; Anshengneng Euchner; WANDFLUH Wanfule; AI-TEK; AZBIL Shanwu; FAG Mahle; SKF SKF; SOR Saul; Barksdale Bus; MIDLAND-ACS； REDLION； Wenglor Weigler; ZIEHL-ABEGG Xerox Bai; SKYWISH ; Puls Purse; di-soric ; Stäubli; PULSOTRONIC; AirCom; STEGO; Binsack; KTB; Square D; Audio Precision； RANSBURG； Maxon；

， Audio Precision, RANSBURG, BRONKHARST, HAUG HAUG, Rosemount Rosemount, Phoenix, Lechler, Deunlin, Copeland (valves), Northstar (probes), YNAI (cylinders), Airtrol (switches) Kemraft (car steering wheel), Autoflow (flow switches) Votech filters, Nugent filters, HLCO filters, Air port cylinders. SCHUNK cylinder, clamp Italian ELCIS WEBER WEIGEL FRIZLEN TIPPKEMPER MATRIX TWK, WEIGEL WEIGER, ELCIS ISIS, FRIZLEN FRIZLEN; AIRTAC; SMC, CKD, YUKEN, NACHI, TOYOOKI, Daikin DAIKIN, TAIYO

G. R.A.S. Denmark GrasGRAS

GRAS/Microphone 46AE GRASGRAS-46AEGRAS precision electric microphone and amplifier

G.R.A.S. AA0070 G.R.A.S. AM0071 G. R.A.S. AL0029 G.R.A.S. 12BB G. R.A.S. 12AL

46AEGRAS GRASG. R.A.S. Denmark Gras

UE, Burkert Baode VASCO Asca, Burkert Baode, Rexroth Rexroth, HYDAC Hedec, GRAS, SENSIT, Carlo Gavazzi Jiale; EGE； TREK； HAWE HAWE, NASON NASON, VICKERS WEIGS, Parker PARKER, ATOS ATOS, TOPWORX, Camozzi Camozzi, abundant microsonic in stock, KUBLER KUBORO, JEFEN GEFRAN, SUN, MAC, SICK SCHK, ASCO Asca, HBM, BAUMER Alliance, MOOG Mug, BANNER BANNA, GF; UE, SUN, NUMATICS Newman Tik, ROSS, COAX, HEIDENHAIN Heidenhain, JUMO Jiumao, E+H Endershause, FESTO Festo, NORGREN Norguan, IFM Yifumen, P+F, PILZ, ACE, Siemens, EMP, TWK, DESTACO, Fairchild, NOVOTECHNIK, VEGA, Hengstler, THALES, Honsberg, TESCOM; Milton Roy; KNF Kaienfu;; KOBOLD Kebao; SAMSON Samson; KYTOLA ； Speek SPECK; Anshengneng Euchner; WANDFLUH Wanfule; AI-TEK; AZBIL Shanwu; FAG Mahle; SKF SKF; SOR Saul; Barksdale Bus; MIDLAND-ACS； REDLION； Wenglor Weigler; ZIEHL-ABEGG Xerox Bai; SKYWISH ; Puls Purse; di-soric ; Stäubli; PULSOTRONIC; AirCom; STEGO; Binsack; KTB; Square D; Audio Precision； RANSBURG； Maxon； Audio Precision, RANSBURG, BRONKHARST, HAUG HAUG, Rosemount Rosemount, Phoenix, Lechler, Deunlin, Copeland (valves), Northstar (probes), YNAI (cylinders), Airtrol (switches) Kemraft (car steering wheel), Autoflow (flow switches) Votech filters, Nugent filters, HLCO filters, Air port cylinders. SCHUNK cylinder, clamp Italian ELCIS WEBER WEIGEL FRIZLEN TIPPKEMPER MATRIX TWK, WEIGEL WEIGER, ELCIS ISIS, FRIZLEN FRIZLEN; AIRTAC; SMC, CKD, YUKEN, NACHI, TOYOOKI, Daikin DAIKIN, TAIYO

G. R.A.S. Denmark GRAS

45BC-14 artificial head \ GRAS45BC-14

45BC-14 Artificial Head \ \ GRAS

G. R.A.S. Denmark GRAS

45BC-14 Artificial Head \ \ GRAS45BC-1445BC-14 Artificial Head Parameters

KEMAR with mouth &

anthropometric ears (2-channel

CCP)

Includes:

- 1 x KEMAR head with mouth simulator &

Torso 45BC, unconfigured

- 1 x Large right ear KB5000,

anthropometrisch (35 Shore OO)

- 1 x Large left ear KB5001,

anthropometrisch (35 Shore OO)

- 2 x Pre-polarized high-resolution

Ohrsimulator Typ RA0402 (IEC 60318-4)

- 2 x Ohrsimulator-Halter GR1874

- 2 x external ear canal GR0408 (for

calibration)

- 2 x Overhead nut GR0409 (for

GR0408)

- 2 x 1/4' preamplifier 26CS, short, with

Mikdotstecker

- 2 x rectangular adapter RA0001 for

1/2' microphone and 1/4' preamp

- 2 x Mikrodot-BNC Kabel AA0018-S (35

cm)

- 2 x BNC-BNC Kabel AA0035 (3 m)

G. R.A.S. Denmark GRAS Power Supply 12BEG. R.A.S. Denmark

12BE参数CCP Microphone feeder 2-channel with TEDS support

Gras12AX

12AX Parameters Microphone Feeder 4-Channel, CCP

For each channel you can choose

0dB, +20 dB or +40 dB gain

be turned on.

(including power supply)

46AE parameter 1/2 'Freifeld Mikrofonset, CCP/IEPE (BNC)

12BB Parameters CCP Microphone Feeder 4-Channel MIT TEDS Support

40PH-10

46BE parameter 11/4 'Freifeld Mikrofonset, CCP/IEPE

(microscope)

Microphone set consisting of

pre-polarized 1/4' free-field microphone

40BE and 1/4' CCP Preamplifier 26CB

with integrated TEDS chip and

Microdot connection