|
US$174.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 25498.3-2010: Electroacoustics -- Simulators of human head and ear -- Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry
Status: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 25498.3-2010 | English | 174 |
Add to Cart
|
3 days [Need to translate]
|
Electroacoustics -- Simulators of human head and ear -- Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry
| Valid |
GB/T 25498.3-2010
|
PDF similar to GB/T 25498.3-2010
Basic data | Standard ID | GB/T 25498.3-2010 (GB/T25498.3-2010) | | Description (Translated English) | Electroacoustics -- Simulators of human head and ear -- Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A59 | | Classification of International Standard | 17.140.50 | | Word Count Estimation | 9,985 | | Date of Issue | 2010-12-01 | | Date of Implementation | 2011-05-01 | | Older Standard (superseded by this standard) | GB/T 7342-1987 | | Quoted Standard | GB/T 4854.1, GB/T 20441.4-2006 | | Adopted Standard | IEC 60318-3-1998, IDT | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 9, 2010 (No. 164 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the audiometer calibrated in order audiometry headphones ear pressure for the load of a certain acoustic impedance acoustic coupler structure and characteristics of the frequency range of 125 Hz ~ 8 000 Hz, the audiometer headphones in GB/T 4854. 1 forth. | GB/T 25498.3-2010: Electroacoustics -- Simulators of human head and ear -- Part 3: Acoustic coupler for the calibration of supra-aural earphones used in audiometry
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Electroacoustics Simulators of human head and ear Part 3. Acoustic coupler for the calibration of supra-aural earphones used in audiometry
ICS 17.140.50
A59
National Standards of People's Republic of China
Replacing GB/T 7342-1987
Electro-acoustics simulator head and ear simulator
Part 3. Calibration ear-type headphones with audiometry acoustic coupler
Part 3. Acousticcouplerforthecalibrationofsupra-
(IEC 60318-3.1998, IDT)
Issued on. 2010-12-01
2011-05-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Introduction Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions
4 Structure 1
4.1 Overview 1
4.2 critical dimension 1
4.3 calibrated pressure microphone 2
4.4 static pressure balancer 2
5 headset coupled with the coupler 4
6 Calibration 4
6.1 Calibration test environment condition 4
6.2 Calibration Method 4
Reference 5
Foreword
GB/T 25498 "electro-acoustics simulator head and ear simulator" is divided into seven sections.
--- Part 1. Align the ear headphones with the ear simulator;
--- Part 2. calibration of audiometric headphones with high-frequency range extending interim acoustic coupler;
--- Part 3. Calibration of the ear-type headphones with audiometry acoustic coupler;
--- Part 4. measuring insert earphones clogged ear simulator;
--- Part 5. Measurement with hearing aids and earphones earbud headphones 2cm3 coupler;
--- Part 6. measurement of bone vibrators force coupler;
--- Part 7. air conduction hearing aids acoustic measurements Head and Torso Simulator.
This section GB/T 25498 Part 3.
This section identical with IEC 60318-3.1998 "people power acoustic simulator head and ear simulator - Part 3. Calibration ear-type audiometry
Headphones with acoustic coupler "(in English).
For ease of use, this section made the following editorial changes.
a) with a decimal point instead of a comma as the decimal point, '' '';
b) Remove IEC 60318-3.1998 Foreword.
This Part replaces GB/T 7342-1987 "audiometric headset calibration IEC provisional reference coupler."
This section of the main changes compared to 7342-1987 GB/T as follows.
a) of this section according to GB/T 1.1-2000 rules increase the "scope" and "normative references" two chapters;
b) the name of this part of the original "audiometric headset calibration IEC provisional reference coupler" to "electro-acoustics simulator poll
And ear simulator - Part 3. Calibration ear-type headphones with audiometry acoustic coupler ";
c) coupling the headset to become independent coupler Chapter 5;
d) Calibration become independent in Chapter 6, and an increase in environmental content alignment tolerance requirements and environmental conditions.
This part is proposed by the Ministry of Industry and Information Technology of the People's Republic of China.
This part of the National Standardization Technical Committee electro-acoustics (SAC/TC23) centralized.
This part of the main drafting units. China Electronics Technology Group Corporation Institute.
Participated in the drafting of this section. Hangzhou Aihua Instrument Co., Ltd., Industry and Telecommunications Research Institute of the Ministry of Information China Telecommunication Technology Labs, Hubei
Provincial Institute of Measurement and Testing, Red Sound Equipment Factory (4380) Jiaxing branch.
The main drafters of this section. Han Jie, Zhang Wei, Jiang Bo, Qu Lin.
The drafters of some of the participants. Zhang Shaodong, Zhu Xiaofeng, a root fire, Shu Guohua.
This part of the standard replaces the previous editions are.
--- GB/T 7342-1987.
Electro-acoustics simulator head and ear simulator
Part 3. Calibration ear-type headphones with audiometry acoustic coupler
1 Scope
This section GB/T 25498 specifies the audiometer calibration, press-ear type headphones audiometry acoustic coupling with a certain acoustic impedance of the load
Clutch structure and characteristics of the frequency range of 125Hz ~ 8000Hz, the audiometry headphones specified in GB/T 4854.1 in.
SPL headset generated in the coupler is generally not equal to the sound pressure level within the human ear produced. However, in order to have mutual audiometer index
Transsexual calibration and audiometric headphones, the device provisions of this Part apply to simple and rapid method.
2 Normative references
The following documents contain provisions which, through reference GB/T 25498 in this section constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.
GB/T 4854.1 acoustic calibration of audiometric equipment - Reference zero - Part 1. the ear headphones pure tone reference equivalent threshold sound pressure levels
(GB/T 4854.1-2004, ISO 389-1.1998, IDT)
GB/T 20441.4-2006 Measurement microphones - Part 4. Specifications for working standard microphones (IEC 61094-4.1995, IDT)
3 Terms and Definitions
The following terms and definitions apply to this part of the GB/T 25498 of.
3.1
Acoustic coupler acousticcoupler
Predetermined shape and volume of the cavity, and calibrated for measuring the sound pressure level within the cavity together with a microphone for the headset
calibration.
4 Structure
4.1 Overview
Coupler shown in Figure 1, you should use a hard, stable and manufacture of non-magnetic material such as brass. Coupler consists of a cylindrical
Chamber composition, it is prescribed by the sound of anti-4.2 volume decisions. Bottom of the cylindrical cavity generally has a high mechanical impedance by the microphone diaphragm
constitute. Cavity wall should be hard enough, the bending vibrations do not affect the output of the microphone.
4.2 critical dimension
4.2.1 critical dimensions of the coupler (see Fig. 1) means to determine the size of the condenser microphone is bounded by those of the cavity size and shape, including a capillary
Tube leak, the upper edge (lip along) and 45 ° angle.
4.2.2 The nominal effective sound volume should be as follows.
V1 = 5780mm3 ± 80mm3
4.2.3 diameter d1 should be as follows.
d1 = 23.825mm ± 0.015mm
4.2.4 diameter d2 should be.
d2 = 18.55mm ± 0.10mm
L2 and height should be.
Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 25498.3-2010_English be delivered?Answer: Upon your order, we will start to translate GB/T 25498.3-2010_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time. Question 2: Can I share the purchased PDF of GB/T 25498.3-2010_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 25498.3-2010_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. If you need your currency to be printed on the invoice, please write an email to [email protected]. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.
|