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JJF 1339-2012 English PDF

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Q: Should I purchase the latest version JJF 1339-2012?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJF 1339-2012 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

US$649.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJF 1339-2012: Calibration Specification for Electro-acoustical. Measurement Instruments
Status: Valid

JJF 1339: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1339-2012	649	Add to Cart	5 days	Calibration Specification for Electro-acoustical. Measurement Instruments	Valid
JJF 1339-1990	239	Add to Cart	2 days	O.T.N. of 4πβ(LS)-γ Coincidence Radioactivity Primary Standard	Obsolete

Similar standards

GB/T 3222.2 GB/T 3222.1 JJG 188 JJF 1338 JJF 1340 JJF 1337

Basic data

Standard ID: JJF 1339-2012 (JJF1339-2012)
Description (Translated English): Calibration Specification for Electro-acoustical. Measurement Instruments
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A59
Classification of International Standard: 17.140
Word Count Estimation: 28,250
Quoted Standard: JJG 176-2005; JJG 188-2002; JJG 389-2003; JJG 607-2003; JJF 1001; JJF 1034-2005; JJG 1059-1999; JJF 1157-2006; GB 3102.7; GB/T 3947-1996; ITU- T P.51-1996
Regulation (derived from): AQSIQ Announcement No. 45 of 2012
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine
Summary: This standard applies to measuring headphones, microphone, speaker, receiver, transmitter electro-acoustic devices such as electro-acoustic characteristics of the electro-acoustic test instrument calibration.

JJF 1339-2012: Calibration Specification for Electro-acoustical. Measurement Instruments

---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.
Calibration Specification for Electro-acoustical.Measurement Instruments People's Republic of China National Metrology Technical Specifications Acoustic Calibration Test Specification Issued on. 2012-03-20 2012-06-20 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Acoustic Calibration Test Specification Focal point. the National Committee of the acoustic measurement technology Drafting. Shenzhen Academy of Metrology and Quality Inspection China Testing Technology Research Institute Hangzhou Aihua Instrument Co., Ltd. State-owned 4380 Factory Jiaxing factory This specification metering commissioned National Technical Committee is responsible for interpreting acoustics Drafters of this specification. Zhang Guoqing (Shenzhen Academy of Metrology and Quality Inspection) Jia Li (Shenzhen Academy of Metrology and Quality Inspection) Wang Jingxi (Shenzhen Academy of Metrology and Quality Inspection) Hao Yu-chuan (China Testing Technology Research Institute) Qian Lijun (Hangzhou Aihua Instrument Co., Ltd.) Tao Yonghao (4380 state-owned factory in Jiaxing Branch)

Introduction (Ⅱ) 1 Scope (1) 2. References (1) 3 terminology and units of measurement (1) 3.1 artificial ear (1) 3.2 artificial mouth (1) 3.3 mouth reference point (1) 3.4 normalized free-field response (1) 3.5 Simulation of speech (2) 3.6 electrical simulation voice (2) 3.7 Simulation speech sound (2) 4 Overview (2) 5 Metrological characteristics (2) 5.1 signal source and frequency range indication error (2) 5.2 Signal source amplitude-frequency characteristics (2) 5.3 total distortion signal source (2) 5.4 electrical measurements (or indicators) amplitude linearity (2) 5.5 offset voltage error (2) 5.6 Sound pressure level measurement error (2) 5.7 artificial ear microphone (with measuring section) frequency response (2) 5.8 artificial mouth (including source) normalized free-field response (3) 5.9 artificial mouth SPL (including source) can be issued (4) 5.10 artificial mouth (including source) total acoustic signal distortion (4) 6 calibration conditions (4) Environmental conditions 6.1 (4) 6.2 standards and other measuring equipment (4) 7 calibration items and calibration methods (5) 7.1 calibration items (5) 7.2 Calibration method (5) 8 calibration results expression (12) 8.1 Calibration data processing (12) 8.2 calibration certificate (13) 8.3 calibration measurement uncertainty (13) 9 Recalibration interval (13) Appendix A calibration certificate (14) Appendix B Uncertainty Evaluation Examples (21)

Introduction

This specification is based on JJF 1071-2010 "National Calibration Specifications writing rules," the preparation of requirements and coding format written. General Terms and JJF 1001 measurement used in this specification "common measurement terms and definitions of" consensus, the main spot The technical term industry adopted GB/T 3947-1996 "Acoustics terminology" and ITU-TP.51.1996 "simulation Definition of mouth ". This specification audio tester artificial ear and the relevant part of the calibration project. the artificial ear pressure sensitivity adjustment Section (including the measuring system) and the artificial ear microphone frequency response is consistent with JJG389-2003 "artificial ear." This specification audio tester artificial mouth and the relevant parts (including source) calibration projects, ITU-T P.51.1996 "artificial mouth" to determine the main acoustic characteristics. Normalized free-field response selected measuring point 2, and electrical Sound tester calibration position closest to the sound. The maximum sound pressure level and can be sent; response requirements and tolerances from Table 3a/P.51 Total distortion calibration method is consistent with the proposal, the total distortion limits depending on the circumstances of domestic production plant slightly enlarged, And an increase in the most common requirements of 1kHz. Acoustic Test metrological characteristics of the present specification given in addition to the above basis, but also a combination of domestic and international electro-acoustic tester main Manufacturer's instructions to the main parameters of the technical requirements. In Appendix B, according JJF 1059-1999 "measurement is not Determine the evaluation and expression "gives examples of assessment SPL measurement uncertainty. Acoustic Calibration Test Specification

1 Scope

This standard applies to the measurement headsets, microphones, speakers, receivers, microphones and other audio devices electro-acoustic properties Electro-acoustic test instrument calibration. 2. References This specification references the following documents. JJG176-2005 sound calibrators JJG188-2002 Sound Level Meter JJG389-2003 artificial ear JJG607-2003 audio signal generator JJF 1001 common measurement terms and definitions JJF 1034-2005 acoustic measurement terminology and definitions JJF 1059-1999 Evaluation and Expression of Uncertainty in Measurement JJF 1157-2006 measuring amplifier calibration specification GB 3102.7 Quantities and units of acoustics GB/T 3947-1996 Acoustics Terminology ITU-TP.51.1996 artificial mouth (ITU-TRecommendationP.51ArtificialMouth) For dated references, only the dated edition applies to this specification; undated reference documents Member, the latest edition (including any amendments) applies to this specification.

3 terminology and units of measurement

JJF 1001, GB/T 3947-1996, ITU-TP.51.1996 and JJF 1034-2005 as defined and The following terms and definitions apply to this specification. This specification uses quantities and units specified in GB 3102.7. 3.1 artificial ear artificialear Acoustic impedance headphones to provide equivalent means average adult ear headphones acoustic impedance calibration. NOTE. rewrite GB/T 3947-1996,6.57. 3.2 artificial mouth artificialmouth Closed cavity equipped with a speaker, the sound directivity and radiation pattern of the average person's speech is similar to the mouth. [ITU-TP.51.1996,4.1] 3.3 mouth reference point (MRP) mouthreferencepoint In the reference axis, from the lips of the plane in front of the point of 25mm. [ITU-TP.51.1996,4.7] 3.4 normalized free-field response normalizedfree-fieldresponse Artificial mouth in free field over a given point produces 1/3 octave spectrum level of the signal while producing a letter in the mouth reference point ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJF 1339-2012_English be delivered?

Answer: Upon your order, we will start to translate JJF 1339-2012_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJF 1339-2012_English with my colleagues?

Answer: Yes. The purchased PDF of JJF 1339-2012_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.

Question 5: Should I purchase the latest version JJF 1339-2012?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJF 1339-2012 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.