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GB/T 20441.3-2010 English PDF

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US$314.00 · In stock
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GB/T 20441.3-2010: Electroacoustics -- Measurement microphone -- Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 20441.3-2010	314	Add to Cart	3 days	Electroacoustics -- Measurement microphone -- Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique	Valid

Similar standards

GB/T 20247 GB/T 19889.1 GB/T 19890 GB/T 20441.8 GB/T 20441.7 GB/T 20441.2

Basic data

Standard ID: GB/T 20441.3-2010 (GB/T20441.3-2010)
Description (Translated English): Electroacoustics -- Measurement microphone -- Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A59
Classification of International Standard: 17.140.50
Word Count Estimation: 16,168
Date of Issue: 2010-12-01
Date of Implementation: 2011-05-01
Older Standard (superseded by this standard): GB/T 6511-1986
Quoted Standard: GB/T 17247.1-2000; GB/T 20441.1-2010; SJ/T 10444-1993; IEC 60027-2-1972; IEC 61094-2-1992; ISO/IEC GUIDE-1995
Adopted Standard: IEC 61094-3-1995, 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 determination of the original free- field sensitivity level approach in order to build in a free field conditions reproducible and accurate measurement of sound pressure foundation. This section applies to satisfy the requirements of laboratory standard microphones GB/T20441. 1. The principle of calibration methods applicable to other types of microphone. In particular, when the required adapter is installed, in accordance with GB/T 20441. 1 required microphone adapter can be removed in this section for calibration. This section applies to highly experience technicians and special requirements of the laboratory.

GB/T 20441.3-2010: Electroacoustics -- Measurement microphone -- Part 3: Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique

---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 Measurement microphone Part 3. Primary method for free-field calibration of laboratory standard microphones by the reciprocity technique ICS 17.140.50 A59 National Standards of People's Republic of China Replacing GB/T 6511-1986 Electric acoustic measurement microphone Part 3. reciprocity technique laboratory standard Primary level approach microphone free-field calibration Part 3. Primarymethodforfree-fieldcalibrationof (IEC 61094-3.1995, 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

Introduction Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 4 reference conditions 2 5 free-field reciprocity calibration Principle 2 6 Factors Affecting the free-field sensitivity of 5 7 Calibration uncertainties 6 Data 8 Appendix A (informative) sound center position of the microphone APPENDIX B (informative) air attenuation coefficient 9 Annex C (informative) microphone sensitivity environmental impact 11

Foreword

GB/T 20441 "electric acoustic measurement microphone" is divided into seven sections. --- Part 1. Laboratory standard microphones; --- Part 2. Method using the original grade reciprocity technique of laboratory standard microphones sound pressure calibration; --- Part 3. Method using the original grade reciprocity technique of laboratory standard microphones free-field calibration; --- Part 4. Specifications for working standard microphones; --- Part 5. working standard microphones calibration by comparison method; --- Part 6. Determination of the frequency response of the electrostatic actuator; --- Part 7. difference between laboratory standard microphones free-field sensitivity and sound pressure sensitivity between. This section GB/T 20441 Part 3. This section identical with IEC 61094-3.1995 "Electroacoustics Measurement microphones - Part 3. reciprocity technique laboratory standard The method of the original level of free-field microphone calibration "(in English). For ease of use, this standard made the following editorial changes. a) instead of as a decimal by decimal comma ",". ","; b) Remove the IEC 61094-3.1995 Foreword; c) increasing the mathematical meaning explanation letter underlined in Note 5.2. This Part replaces GB/T 6511-1986 "adopted reciprocity technique φ23.77mm standard condenser microphone for free - field calibration of precision Encryption method. " This part of GB/T 6511-1986 The main differences are as follows. In addition to the basic principles and techniques have a greater change in the content, structure, narrative and choreography; a) increasing the foreword and directory; b) the standard applies only to φ23.77mm of standard condenser microphones, the original scale method specified in this part apply to GB/T 20441 Laboratory standard microphones in Section 1 (including φ23.77mm standard microphone). Thus, in the text content In addition to the increased φ23.77mm microphone, the other part of laboratory standard microphones; c) the content of the text by the 4 to 7. Increase the scope, normative references, reference conditions, the impact of free-field sensitivity Degree of uncertainty factors and calibration, replace the original standard calibration method and apparatus for calibration of absolute accuracy, etc. content; d) increase environmental impact Appendix C microphone sensitivity. This part of the Annex A, Annex B, Annex C is informative appendix. 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 section is drafted. Nanjing University, Jiangsu Electronic Information Products Quality Supervision and Inspection Institute, China Testing Technology Research Institute. The main drafters of this section. Shen Yong, Zhao Qichang, Zhang Zhiqiang, Hao Yu-chuan. This part of the previous version of the standard replaces the release case. --- GB/T 6511-1986. Electric acoustic measurement microphone Part 3. reciprocity technique laboratory standard Primary level approach microphone free-field calibration

1 Scope

This section GB/T 20441 specifies the primary method for determining the free-field sensitivity level in order to establish in a free field conditions and reproducible Accurate measurement of sound pressure basis. This section applies for laboratory standard microphones GB/T 20441.1 requirements. Principle calibration method applicable to other types of microphone. In particular, when fitted with the provisions of the adapter, in line with GB/T 20441.1 requirements microphone adapter can be removed, in accordance with This section calibration. This section applies to laboratory technicians with high experience and special requirements.

2 Normative references

The following documents contain provisions which, through reference GB/T 20441 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 17247.1-2000 acoustic attenuation of sound during propagation outdoors - Part 1. Calculation (eqv ISO 9613-1 atmospheric sound absorption. 1993) GB/T 20441.1-2010 Electric Acoustic Measurement microphones - Part 1. Laboratory standard microphones (IEC 61094-1. 2000, IDT) SJ/T 10444-1993 electroacoustic term (eqv IEC 60050 (801). 1984AcousticsandElectro-acoustics) Letter symbols used in Section 21972 of electronic technology.. IEC 60027-2 telecommunications and electronics IEC 61094-2.1992 Measurement microphones - Part 2. reciprocity technology laboratory calibration microphone sound pressure level of the original method ISO /IEC Guide.1995 Guide to the Expression of Uncertainty in Measurement (GUM)

3 Terms and Definitions

GB/T 20441.1-2010 and as defined in the following terms and definitions apply to this section. 3.1 Reciprocity microphone reciprocalmicrophone Linear passive microphone, its open forward and reverse transfer impedance (see IEC 60027-2. 1972 206) in magnitude relative And the like. 3.2 Free-field microphone sensitivity of the phase angle phaseangleoffree-fieldsensitivityofamicrophone For the sine plane traveling wave a given frequency, the sound incident direction and under given environmental conditions, the open circuit voltage of a predetermined sound pressure The phase angle between the microphone when not in the position of its center about the sound. Note. in degrees or radians (° or rad). 3.3 Microphone acoustic center acousticcentreofamicrophone For transmitting the microphone, to a predetermined fixed frequency sinusoidal signal and the direction and distance of a point, the point about the concept of a small scale ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 20441.3-2010_English be delivered?

Answer: Upon your order, we will start to translate GB/T 20441.3-2010_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 20441.3-2010_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 20441.3-2010_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+ countries

Question 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 Sales@ChineseStandard.net. 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.