JJG 306-2004 English PDF

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JJG 306-2004: Verification Regulation of 24m Invar Wire
Status: Valid

JJG 306: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 306-2004	469	Add to Cart	3 days	Verification Regulation of 24m Invar Wire	Valid
JJG 306-1982	719	Add to Cart	5 days	Verification Regulation of 24m Invar Wire	Obsolete

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Basic data

Standard ID: JJG 306-2004 (JJG306-2004)
Description (Translated English): Verification Regulation of 24m Invar Wire
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A52
Classification of International Standard: 17.040
Word Count Estimation: 18,120
Date of Issue: 2004-06-04
Date of Implementation: 2004-12-01
Older Standard (superseded by this standard): JJG 306-1982
Issuing agency(ies): State Administration of Quality Supervision, Inspection and Quarantine
Summary: This standard applies to 24m Yinwa Ji line ruler initial verification, testing and use of follow-up inspection.

JJG 306-2004: Verification Regulation of 24m Invar Wire

---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 24m Invar Wire National Metrology Verification Regulations of the People's Republic 24m Inwa baseline ruler 24mInvarWire Released on June.2004 Implementation of.2004-12-01 The General Administration of Quality Supervision, Inspection and Quarantine issued Replace JJG 306-1982 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 Geometric Length Measurement Technical Committee Drafted by. China Institute of Metrology This regulation entrusts the National Geometric Length Measurement Technical Committee to explain The main drafters of this procedure. Li Jianshuang (China Institute of Metrology) Tao Xiangqin (China Institute of Metrology) Zhao Yan (China Institute of Metrology)

table of Contents

1 Scope (1) 2 Citations (1) 3 terms (1) 4 Overview (1) 5 Metrological performance requirements (1) 5.1 Linear expansion coefficient of the baseline ruler (1) 5.2 Length of the baseline ruler (1) 6 General technical requirements (1) 6.1 Appearance (1) 6.2 Identification (2) 7 measuring instrument control (2) 7.1 Verification conditions (2) 7.2 Verification project (2) 7.3 Verification method (3) 7.4 Processing of verification results (8) 7.5 Verification cycle (8) Appendix A Verification Data Calculation Example (9) Appendix B Baseline Rule Certificate Internal Page Format (11) Appendix C Principles of Baseline Length Verification (12) 24m Inwa baseline rule verification procedure

1 Scope

This procedure applies to the first verification, subsequent verification and in-use inspection of the 24m watt baseline.

2 Citations

This procedure refers to the following documents. JJF1059-1999 Measurement Uncertainty Evaluation and Representation JJF1001-1998 General measurement terms and definitions JJF1094-2002 Measuring instrument characteristic evaluation GB 16789-1997 Specification for long baseline measurements When using this procedure, care should be taken to use the current valid version of the above cited documents.

3 terms

The linear expansion coefficient of the baseline ruler means that both ends of the ruler are led to the pulley at a specific tension (98N) level and are suspended. The coefficient of linear expansion measured in the case of a chain. The length of the baseline ruler means that at 20 ° C, both ends of the ruler are led to the pulley at a specific tension (98 N) level and In the case of a catenary, the distance between the two ends of the baseline ruler is the same as the line.

4 Overview

The 24m Inwa baseline ruler (hereinafter referred to as the baseline ruler) is wired and strip-shaped, and belongs to the national line pattern verification system. Second-class standard. It serves as the standard length for field verification baselines and is used for baseline measurements in national geodetic control networks. Seismic deformation measurement, precision engineering measurement, etc.

5 Metrological performance requirements

5.1 Linear expansion coefficient of the baseline ruler 5.1.1 For the measurement of the baseline scale than the long baseline, the coefficient of linear expansion should be no more than 0.5 × 10-6 ° C-1. 5.1.2 The baseline expansion coefficient used for other purposes shall be no more than 1×10-6°C-1. 5.1.3 The standard uncertainty of the calibration results of the baseline ruler expansion coefficient shall not exceed 3×10-8°C-1. 5.2 Length of the baseline ruler 5.2.1 The difference between the actual length and the nominal length at 20 °C for measuring the baseline scale over a long baseline should be no more than 5 mm. 5.2.2 The full-length extended uncertainty of the baseline length test results shall not exceed 20 μm (k=3).

6 General technical requirements

6.1 Appearance The base ruler stored on the ruler drum should be neatly and tightly wounded, and there should be no loose or overlapping phenomenon. Baseline ruler should have no plan ......

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