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JJG 655-2021 English PDF

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Q: Should I purchase the latest version JJG 655-2021?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 655-2021 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$749.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJG 655-2021: Noise Dosimeters
Status: Valid

JJG 655: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 655-2021	749	Add to Cart	5 days	Noise Dosimeters	Valid
JJG 655-1990	399	Add to Cart	3 days	Verification regulation of noise dosimeters	Obsolete

Similar standards

GB/T 36126 JJG 646 GB/T 1885 JJG 648 JJG 649 JJG 652

Basic data

Standard ID: JJG 655-2021 (JJG655-2021)
Description (Translated English): Noise Dosimeters
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A53
Word Count Estimation: 33,326
Issuing agency(ies): State Administration for Market Regulation

JJG 655-2021: Noise Dosimeters

---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.
Noise Dosimeters People's Republic of China National Metrological Verification Regulations noise dosimeter Published on 2021-12-28 2022-06-28 Implementation Released by the State Administration for Market Regulation Noise Dosimeter Verification Regulations Replacing JJG 655-1990 Focal Point. National Acoustic Metrology Technical Committee Drafting unit. Gansu Metrology Research Institute Hunan Sound Instrument Measurement and Control Technology Co., Ltd. China Institute of Metrology Shandong Institute of Metrology Hangzhou Aihua Instrument Co., Ltd. State-owned 4380 Factory Jiaxing Branch This regulation is entrusted to the National Acoustic Metrology Technical Committee to be responsible for the interpretation The drafters of this regulation. Lu Guangjun (Gansu Metrology Research Institute) Liu Xiangheng (Hunan Sound Instrument Measurement and Control Technology Co., Ltd.) Bai Ying (China Institute of Metrology) Sun Yong (Shandong Institute of Metrology) Xiong Wenbo (Hangzhou Aihua Instrument Co., Ltd.) Du Furong (Gansu Metrology Research Institute) Shu Guohua (State-owned 4380 Factory Jiaxing Branch)

Introduction (Ⅱ) 1 Scope(1) 2 References (1) 3 Terms and units of measurement(1) 3.1 Terms and Definitions (1) 3.2 Units of measurement (2) 4 Overview(3) 5 Measurement performance requirements(3) 5.1 Acoustic sensitivity(3) 5.2 Frequency Weighting(4) 5.3 Linearity of steady-state signal response(5) 5.4 Response to short duration signals(5) 5.5 Self-locking overload indicator (6) 6 General technical requirements (6) 6.1 Submit test(6) 6.2 Signs and information(6) 6.3 Appearance and structure(6) 7 Measuring Instrument Control(7) 7.1 Verification Conditions (7) 7.2 Verification items (8) 7.3 Verification method(8) 7.4 Processing of Verification Results (14) 7.5 Test period(15) 7.6 In-use inspection(15) Appendix A Verification Certificate and Verification Result Notification Inner Page Format (16) Appendix B Measurement Uncertainty Evaluation Example(22)

Introduction

JJF1002 "Rules for the Compilation of National Metrology Verification Regulations", JJF1001 "General Metrology Terms and Definitions" and JJF1059.1 "Assessment and Representation of Measurement Uncertainty" together constitute the basic series supporting the revision of this Regulation document. This regulation mainly refers to GB/T 15952-2010 "Specification for Electroacoustic Personal Sound Exposure Meter", JJG 980- 2003 "Personal Sound Exposure Meter" and JJG 188-2017 "Sound Level Meter". This procedure also references American National Standards This regulation replaces JJG 655-1990 "Noise Dosimeter". Compared with JJG 655-1990, the main technical changes as follows. --- Expanded the scope of application, suitable for noise dosimeters commonly used for various evaluation standards of sound level and exchange rate; --- Added "Terms and Units of Measurement"; --- Cancel the classification of noise dosimeters; --- Changed the measurement performance requirements, deleted "inherent noise", "detector characteristics" and "integrator characteristics", Added "Response to Short Sustained Signal" and "Lock Overload Indicator"; --- Changed the requirements for frequency weighting; --- Added general technical requirements; --- Changed the verification environmental conditions and reference environmental conditions; --- Changed the requirements for measurement standards and main supporting equipment; --- Increased the requirements and test methods for in-use inspection; ---Changed the verification method; --- Added the requirement for numerical rounding; --- Changed the format of the verification certificate and added the format of the verification result notification; --- Added appendix "Example of Evaluation of Measurement Uncertainty". The previous versions of this regulation have been released as follows. ---JJF655-1990. Noise Dosimeter Verification Regulations

1 Scope

This regulation is applicable to the noise with a standard sound level of 85dB or 90dB and an exchange rate of 3dB, 4dB or 5dB Initial verification, subsequent verification and in-use inspection of sound dosimeters. Noise dosimeters using other evaluation criteria for sound level and/or exchange rate may be implemented by reference.

2 Reference documents

This procedure cites the following documents. JJG 188-2017 Sound Level Meter JJF1001-2011 General Metrology Terms and Definitions JJF1034-2020 Acoustic Metrology Terms and Definitions JJF1059.1-2012 Evaluation and representation of measurement uncertainty JJF1147-2006 Specification for calibration of acoustic properties of anechoic and semi-anechoic rooms GB/T 3102.7-1993 Quantities and Units of Acoustics GB/T 3785.1-2010 Electroacoustic Sound Level Meter Part 1.Specification GB/T 3947-1996 Acoustic terminology GB/T 15952-2010 Specification for electroacoustic personal sound exposure meter For dated citations, only the dated version applies to this Regulation; for undated citations The latest version (including all amendments) applies to this regulation.

3 Terminology and units of measurement

3.1 Terms and Definitions The terms and definitions defined in JJF1001-2011, JJF1034-2020 and GB/T 3947-1996 and the following are applicable used in this protocol. 3.1.1 Noise dose noisedose The ratio of the actual exposure time at a certain noise level to the allowable exposure time at that noise level. Note. The total noise dose for working days can be calculated according to formula (1). D= T1 Tp1 T2 Tp2 Tn Tpn ×100 (1) where. D---sum of noise doses in working days, %; Tn---actual exposure time at a specific noise level, h; Tpn---allowable exposure time under a specific noise level, h. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJG 655-2021_English be delivered?

Answer: Upon your order, we will start to translate JJG 655-2021_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 JJG 655-2021_English with my colleagues?

Answer: Yes. The purchased PDF of JJG 655-2021_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 JJG 655-2021?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 655-2021 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.