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JJF 1168-2024 English PDF

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Q: Should I purchase the latest version JJF 1168-2024?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJF 1168-2024 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$399.00 · In stock
Delivery: <= 4 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJF 1168-2024: Calibration Specification for Portable Braking Performance Testers of Vehicles
Status: Valid

JJF 1168: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1168-2024	399	Add to Cart	4 days	Calibration Specification for Portable Braking Performance Testers of Vehicles	Valid
JJF 1168-2007	559	Add to Cart	3 days	Calibration Specification for Portable Braking Performance Tester for Motor Vehicle	Obsolete

Basic data

Standard ID: JJF 1168-2024 (JJF1168-2024)
Description (Translated English): Calibration Specification for Portable Braking Performance Testers of Vehicles
Sector / Industry: Metrology & Measurement Industry Standard
Word Count Estimation: 19,175
Date of Issue: 2024-09-18
Date of Implementation: 2024-12-18
Issuing agency(ies): State Administration for Market Regulation

JJF 1168-2024: Calibration Specification for Portable Braking Performance Testers of Vehicles

---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 Technical Specifications of the People's Republic of China Calibration specification for portable brake performance tester Released on 2024-09-18 Implementation on 2024-12-18 The State Administration for Market Regulation issued Portable Braking Performance Tester Calibration Specifications Replaces JJF 1168-2007 Responsible unit. National Legal Metrology Management Metrology Technical Committee Motor Vehicle Inspection and Quarantine Scoring Technical Committee Main drafting unit. Zhejiang Institute of Metrology Jilin Institute of Metrology Hebei Provincial Institute of Metrology Supervision and Inspection Participating in the drafting. Gansu Institute of Metrology Shanghai Xipai Automation Instrument Engineering Co., Ltd. Shandong Institute of Metrology Henan Institute of Metrology This specification is entrusted to the National Legal Metrology Management Metrology Technical Committee Motor Vehicle Inspection and Testing Technical Committee The committee is responsible for interpreting The main drafters of this specification are. Shao Jianwen (Zhejiang Institute of Metrology) Fang Facheng (Jilin Institute of Metrology) Xing Peng (Hebei Provincial Institute of Metrology Supervision and Inspection) Participating drafters. Gao Decheng (Gansu Institute of Metrology) Jiang Yuchen (Shanghai Xipai Automation Instrument Engineering Co., Ltd.) Ma Xiao (Shandong Institute of Metrology) Liu Tao (Henan Institute of Metrology)

Introduction (II) 1 Scope(1) 2 References(1) 3 Terminology (1) 3.1 Portable brake performance tester (1) 3.2 Indoor dynamic calibration device (1) 3.3 Braking coordination time (1) 4 Overview(1) 5 Metering characteristics (2) 5.1 Static calibration(2) 5.2 Dynamic calibration(2) 6 Calibration conditions(2) 6.1 Environmental conditions(2) 6.2 Measurement standards and other equipment (2) 7 Calibration items and calibration methods (3) 7.1 Static calibration(3) 7.2 Dynamic calibration(5) 8 Expression of calibration results (7) 9 Recalibration interval (7) Appendix A Portable Braking Performance Tester Calibration Record (8) Appendix B Calibration Certificate (Inner Page) Contents (9) Appendix C Example of uncertainty assessment of indication error of portable brake performance tester (10)

Introduction

JJF 1071 "Rules for the Preparation of National Metrology and Calibration Specifications", JJF 1001 "General Metrology Terms and Definitions", JJF 1059.1 "Evaluation and Expression of Uncertainty in Measurement" together constitute the basic series supporting the revision of this specification specification. This specification mainly refers to GB/T 28945-2012 "Portable Braking Performance Tester", GB 7258 "Motor Vehicle Compared with JJF 1168-2007, except for the editorial revision, this specification mainly The main technical changes are as follows. --- Added the term brake coordination time, and specified its measurement range and calibration method (see 5.2.2 and 7.2.3); --- Deleted the appearance and data retention and calibration methods in the metrological characteristics, and divided the metrological characteristics into static calibration and dynamic calibration; --- Added indoor dynamic calibration device as one of the dynamic calibration devices, and clarified its calibration method (see 3.2 and 7.2.2). The previous versions of this specification are as follows. ---JJF 1168-2007. Calibration specification for portable brake performance tester

1 Scope

This specification applies to the calibration of portable brake performance testers.

2 References

This specification references the following documents. GB 7258-2017 Technical conditions for motor vehicle operation safety GB/T 28945-2012 Portable Braking Performance Tester T/CMAJD009-2020 Dynamic inspection items and methods of portable brake performance tester For any referenced document with a date, only the version with the date is applicable to this specification. The latest version (including all amendments) shall apply to this specification.

3 Terminology

The following terms and definitions defined in GB/T 28945-2012 and T/CMAJD009-2020 apply to this specification. By recording the time history of the deceleration value during the vehicle braking process and calculating the speed and distance, we can calculate The fully developed mean deceleration (MFDD) and brake coordination time required by GB 7258 are used to judge the maneuverability. Portable test instrument for the braking performance of vehicles. [Source. GB/T 28945-2012, 3.1] The device for calibrating the dynamic performance of portable brake performance tester in the laboratory is generally composed of a linear track, It consists of a mobile platform, a drive device, and a measurement and control system. [Source. T/CMAJD009-2020, 3.2, modified] 3.3 Brake coordinated time When braking suddenly, the time from when your foot touches the brake pedal (or your hand touches the brake handle) to when the vehicle decelerates to The time required to fully develop 75% of the average deceleration value specified in GB 7258. [Source. GB/T 28945-2012, 3.3]

4 Overview

The portable brake performance tester is a test instrument used to measure the braking performance of motor vehicles. The time history of the deceleration value during the process, after calculating the speed and distance, can be calculated to meet the requirements of GB 7258 The fully exerted mean deceleration (MFDD) and the braking coordination time are generally determined by the acceleration sensor, the host, and the brake. It consists of a pedal contact switch and a micro printer. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJF 1168-2024_English be delivered?

Answer: Upon your order, we will start to translate JJF 1168-2024_English as soon as possible, and keep you informed of the progress. The lead time is typically 2 ~ 4 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJF 1168-2024_English with my colleagues?

Answer: Yes. The purchased PDF of JJF 1168-2024_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 JJF 1168-2024?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJF 1168-2024 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.