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JJG 959-2024 English PDF

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Q: Should I purchase the latest version JJG 959-2024?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 959-2024 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$559.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJG 959-2024: Optical Time Domain Reflectometers
Status: Valid

JJG 959: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 959-2024	559	Add to Cart	5 days	Optical Time Domain Reflectometers	Valid
JJG 959-2001	959	Add to Cart	5 days	Verification Regulation of Optical Time Domain Reflectometers	Obsolete

Basic data

Standard ID: JJG 959-2024 (JJG959-2024)
Description (Translated English): Optical Time Domain Reflectometers
Sector / Industry: Metrology & Measurement Industry Standard
Word Count Estimation: 27,293
Date of Issue: 2024-02-07
Date of Implementation: 2024-08-07
Issuing agency(ies): State Administration for Market Regulation

JJG 959-2024: Optical Time Domain Reflectometers

---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.
National Metrology Verification Regulations of the People's Republic of China Optical Time Domain Reflectometer Released on 2024-02-07 2024-08-07 Implementation The State Administration for Market Regulation issued Verification procedures for optical time domain reflectometer Replace JJG 959-2001 Responsible unit. National Optical Metrology Technical Committee Main drafting unit. National Communications Metrology Station China National Institute of Metrology This regulation is entrusted to the National Optical Metrology Technical Committee for interpretation The main drafters of this regulation are. Sun Xiaoqiang (National Communication Metrology Station) Zhang Yingyan (National Communications Metrology Station) Li Tianchu (China National Institute of Metrology) Participating drafters. Fu Dongbo (National Communications Metrology Station) Xu Nan (China Institute of Metrology)

Introduction (II) 1 Scope(1) 2 References(1) 3 Terminology and units of measurement (1) 4 Overview(2) 5 Metrological performance requirements (3) 5.1 Central wavelength (3) 5.2 Distance deviation (3) 5.3 Loss deviation (3) 5.4 Dynamic range(3) 5.5 Attenuation blind zone (3) 5.6 Event Blind Zone (4) 5.7 Measuring range (4) 5.8 Optical return loss deviation (4) 6 General technical requirements (4) 6.1 Logo(4) 6.2 Appearance(4) 6.3 Function keys (4) 7 Measuring instrument control (4) 7.1 Initial verification, subsequent verification and in-use inspection (4) 7.2 Verification conditions (4) 7.3 Verification items and verification methods (5) 7.4 Processing of verification results (15) 7.5 Verification cycle (15) Appendix A Recommended Format for OTDR Calibration Records (16) Appendix B Recommended format of optical time domain reflectometer verification certificate and verification result notification (inside page) (19)

Introduction

JJF1002-2010 "Rules for the Preparation of National Metrology Verification Procedures", JJF1001-2011 "General Metrology Terms and Definition” and JJF1059.1-2012 “Evaluation and Expression of Uncertainty in Measurement” together constitute the basis for the revision of this regulation. A series of basic specifications. This regulation is a revision of JJG 959-2001 "Optical Time Domain Reflectometer" which was first issued on May 1,.2001. Compared with JJG 959-2001, the main technical changes are as follows. ---The scope of application covers single-mode and multi-mode optical time domain reflectometers; ---The central wavelength verification project has been expanded to include 850nm, 1300nm, 1490nm, 1625nm and other communication wavelengths Long window; --- Deleted the distance scale coefficient verification item; ---Change the position deviation and distance characteristic verification items to distance deviation verification items. The verification methods are divided into Two types. standard fiber method (passive method) and time synthesis method (active method); --- Deleted the loss scale coefficient and loss characteristic verification items, and changed them to loss deviation verification items. There are two methods. standard fiber method (passive method) and time synthesis method (active method); --- Increased measurement range verification items; ---Added optical return loss deviation test item. The previous versions of this regulation are as follows. JJG 959-2001. Verification procedures for optical time domain reflectometer

1 Scope

This procedure applies to the initial and subsequent verification of single-mode and multimode optical time domain reflectometers (OTDR).

2 References

This specification has no referenced documents.

3 Terminology and units of measurement

3.1 Central wavelength For a continuous spectrum, the central wavelength is defined as λc=∫Pλdλ ∫Pλdλ (1) Where. λ --- wavelength; Pλ ---power spectral density of the light source. For the separated spectrum, the central wavelength is defined as λc= Piλi Pi (2) In the formula λi --- wavelength; Pi---The power of the laser mode with wavelength λi. 3.2 Reference distance The distance from the output end face of the OTDR light source to the optical fiber is determined by a measurement standard or measuring instrument with higher accuracy than the OTDR. The distance between two feature points is represented by Lref and its unit is m. 3.3 Distance Deviation ΔL=Lotdr-Lref (3) Where. Lotdr---The displayed value of the reference distance measured by OTDR. 3.4 Reference loss The loss of a section of optical fiber is accurately calibrated by a method that does not directly use the OTDR power scale, and is represented by Aref. The unit is dB. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJG 959-2024_English be delivered?

Answer: Upon your order, we will start to translate JJG 959-2024_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 959-2024_English with my colleagues?

Answer: Yes. The purchased PDF of JJG 959-2024_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 959-2024?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 959-2024 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.