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JJG 779-2004 English PDF

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JJG 779-2004: Verification regulation of speed and milege meter for standard equipment
Status: Valid

JJG 779: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJG 779-2004	English	339	Add to Cart	3 days [Need to translate]	Verification regulation of speed and milege meter for standard equipment	Valid	JJG 779-2004
JJG 779-1992	English	879	Add to Cart	6 days [Need to translate]	Verification Regulation of Chcker of Speed and Milege Meter for Cars	Obsolete	JJG 779-1992

PDF similar to JJG 779-2004

Standard similar to JJG 779-2004

GB/T 36126 JJG 762 GB/T 1885 JJG 126 JJG 781 JJG 769

Basic data

Standard ID	JJG 779-2004 (JJG779-2004)
Description (Translated English)	Verification regulation of speed and milege meter for standard equipment
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A53;T39
Word Count Estimation	13,198
Date of Issue	2004-06-04
Date of Implementation	2004-12-01
Older Standard (superseded by this standard)	JJG 779-1992
Quoted Standard	OIML Recommendation NO.55-1981
Issuing agency(ies)	State Administration of Quality Supervision, Inspection and Quarantine
Summary	This standard applies to all types of standard equipment speedometer initial verification, testing and use of follow-up inspection.

JJG 779-2004: Verification regulation of speed and milege meter for standard equipment

---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.
Verification regulation of speed and milege meter for standard equipment National Metrology Verification Regulations of the People's Republic Speedometer standard device Released on June.2004 Implementation of.2004-12-01 The General Administration of Quality Supervision, Inspection and Quarantine issued Speedometer standard device verification procedure Ment Replace JJG 779-1992 This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on June 4,.2004, and Implemented on December 1,.2004. Focal Point. National Vibration Shock Velocity Measurement Technical Committee Drafted by. China Institute of Metrology Beijing Metrology and Testing Institute This regulation entrusts the National Vibration Shock Velocity Measurement Technical Committee to explain The main drafters of this procedure. Xu Yin (China Institute of Metrology) Wu Chengqi (Beijing Metrology and Testing Institute)

1 Scope (1) 2 Citations (1) 3 terms and units of measurement (1) 3.1 Speedometer (1) 3.2 Odometer constant k (1) 3.3 Vehicle coefficient w (1) 3.4 Speedometer constants (1) 3.5 Speed stability (1) 4 Overview (1) 5 Metrological performance requirements (2) 5.1 Standard device signal source frequency accuracy and 4h frequency stability (2) 5.2 Speed range (2) 5.3 Speed uncertainty (2) 5.4 0.5h speed stability (2) 5.5 Speed resolution (2) 5.6 Counting tolerance (2) 6 General technical requirements (2) 6.1 Appearance requirements (2) 6.2 Output Interface Requirements (2) 6.3 Working noise requirements (2) 6.4 Accessories and manual requirements (2) 7 measuring instrument control (2) 7.1 Verification conditions (3) 7.2 Verification items and verification methods (3) 7.3 Processing of verification results (5) 7.4 Verification cycle (6) Appendix A Speedometer Standard Equipment Verification Record (7) Appendix B Verification certificate back format (8) Speedometer standard device verification procedure

1 Scope

This procedure is applicable to the first verification, subsequent verification and inspection in use of standard equipment for various speedometers.

2 Citations

OIML International recommends No. 55-1981 speedometers for motor vehicles, mechanical odometers and instantaneous recorders. Care should be taken to use the currently valid version of the cited literature.

3 terms and units of measure

3.1 Speedometer A meter used by a motor vehicle to indicate the instantaneous speed of a vehicle is called a speedometer and is used to indicate that the wheel is in motion during travel. The meter that converts the mileage corresponding to the total number of revolutions is called the odometer. The two instruments that are installed in the same chassis are called the speed. Schedule. 3.2 Odometer constant k Depending on the type of signal (number of revolutions or pulses of the drive shaft), and the odometer or instantaneous recorder indication and/or Record the characteristic quantity of the number of signals that must be accepted for each additional 1km mileage. The constant k should be in the revolution/km or pulse/km table. Show. 3.3 Vehicle coefficient w According to the type of signal (number of revolutions or number of pulses of the drive shaft) and the vehicle's device is emitted and transmitted every kilometer of travel The characteristic quantity of the number of signals to the odometer or transient recorder. The coefficient w must be expressed in the same unit as the constant k. The coefficient w varies with the load, size, tire pressure and wear level of the vehicle. It must be tested in the standard. Determined under the test conditions. 3.4 Speedometer constant Signal frequency at 60km/h speed according to signal type (drive shaft revolution or number of pulses) and speedometer Feature amount. The speedometer constant can be expressed as the number of revolutions per minute, that is, the revolution/km, which can also be expressed as the number of pulses per minute. Ie pulse/km. When both the odometer and the speedometer use the same drive system, the speedometer and the odometer are used. An odometer constant k. 3.5 Speed stability The ratio of the maximum, minimum difference and average value measured every 3 minutes during the 0.5 h period.

4 Overview

The speedometer standard device (hereinafter referred to as the standard device) is used to determine the speedometer and odometer for motor vehicles. And the speedometer can also be used to verify the corresponding accuracy of the tachometer.

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