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JJF 1959-2021: Calibration Specification for General Bevel Protractors
Status: Valid
| Std ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status |
| JJF 1959-2021 | English | 309 |
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Calibration Specification for General Bevel Protractors
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Standard similar to JJF 1959-2021
GB/T 3222.1 | JJF 1234 | JJF 1396 | JJF 1955 | JJF 1956 | JJF 1954 | Basic data
| Standard ID | JJF 1959-2021 (JJF1959-2021) |
| Description (Translated English) | Calibration Specification for General Bevel Protractors |
| Sector / Industry | Metrology & Measurement Industry Standard |
| Classification of Chinese Standard | A57 |
| Word Count Estimation | 13,141 |
| Issuing agency(ies) | State Administration for Market Regulation |
JJF 1959-2021: Calibration Specification for General Bevel Protractors
---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.
Calibration Specification for General Bevel Protractors
National Metrology Technical Specification of the People's Republic of China
General Probe Calibration Specification
Published on 2021-12-28
2022-06-28 Implementation
Released by the State Administration for Market Regulation
General Probe Calibration Specification
Replacing JJG33-2002
Focal Point. National Technical Committee on Geometric Length Measurement
Main drafting unit. Beijing Institute of Metrology and Testing Sciences
Chongqing Institute of Metrology and Quality Inspection
Participating in the drafting unit. Changzhou Inspection and Testing Standards Certification Institute
This specification entrusts the National Technical Committee of Geometry and Length Measurement to be responsible for the interpretation
The main drafters of this specification.
Cui Rui (Beijing Institute of Metrology and Testing)
Zhang Manshan (Beijing Institute of Metrology and Testing)
Zhang Bo (Beijing Institute of Metrology and Testing)
Jiang Cong (Chongqing Institute of Metrology and Quality Inspection)
Quan Yizhi
Participating drafters.
Zhou Jun (Changzhou Institute of Inspection and Testing Standards Certification)
Table of contents
Introduction (Ⅱ)
1 Scope(1)
2 References (1)
3 Overview(1)
4 Metrology Characteristics(3)
5 Calibration Conditions(3)
5.1 Environmental conditions (3)
5.2 Measurement standards and other equipment(3)
6 Calibration items and calibration methods (4)
6.1 Parallelism of measuring surfaces with ruler and base ruler (4)
6.2 Perpendicularity of outside corners of a square (4)
6.3 Repeatability(4)
6.4 Indication error(5)
7 Expression of calibration results (5)
8 Recalibration interval(5)
Appendix A Evaluation of Uncertainty of Measurement Result of Error of Indication Value of Digital Display Angle Ruler (Example) (6)
Appendix B Calibration Certificate Inner Page Format (8)
Introduction
JJF 1071-2010 "Rules for the Compilation of National Metrology Calibration Standards", JJF 1001 "General Metrology Terms and Definitions"
Together with JJF 1059.1-2012 "Assessment and Representation of Measurement Uncertainty", it forms the basis for supporting the compilation of this specification
Sexual Series Norms.
In the formulation of this specification, reference is made to GB/T 6315-2008 "Vernier, Band Watch and Digital Display Universal Angle Ruler",
Relevance of digital display universal angle ruler and electronic digital display angle ruler in JB/T 11243-2012 "Electronic Digital Display Angle Ruler"
Projects and Methods.
This specification is the revision of JJG33-2002 "Universal Angle Ruler".
The main changes in this specification are as follows.
--- Expanded the scope of application of the specification, and added related items of digital display angle ruler;
--- canceled the "Appearance and Interaction" item;
--- Canceled the item of "scribed line width and width difference";
--- Canceled the item "distance from the edge of the scale surface to the scale surface of the main ruler or the distance between the pointer and the scale surface of the watch";
--- Canceled the item "Flatness of measuring surface";
--- Canceled the item "Correctness of zero position of universal angle ruler with watch";
--- Revised the "Indication Error" calibration item and calibration method;
---Added the calibration item and calibration method of the digital display angle ruler "straight edge and base ruler measuring plane parallelism";
--- Added "repeatability" calibration item;
--- Added an example of the uncertainty evaluation of the measurement result of the indication error.
Previous releases of this specification.
---JJG33-2002;
---JJG33-1979.
General Probe Calibration Specification
1 Scope
This specification applies to the calibration of vernier, table and digital angle rulers.
2 Reference documents
This specification references the following documents.
JJF 1071-2010 Rules for Compilation of National Metrology and Calibration Specifications
GB/T 6315-2008 Vernier, belt watch and digital display universal angle ruler
For dated references, only the dated version applies to this specification; for undated references
The latest version (including all amendments) applies to this specification.
3 Overview
Universal angle ruler is an angle measuring instrument that uses the angle separated by the relative rotation of two measuring surfaces to read. press read
Different digital methods are divided into vernier type, belt table type and digital display type. The main structure of the vernier angle ruler is shown in Figure 1.
The table angle ruler is shown in Figure 2, and the typical structure of the digital display angle ruler is shown in Figure 3.
Universal angle ruler is widely used in machining, automobile manufacturing, building decoration, drilling and other related industries.
Measurement.
(a) Type I vernier angle ruler
1-square; 2-vernier; 3-brake block;
4-sector plate; 5-block; 6-main ruler;
7-measurement surface; 8-ruler; 9-measurement surface
(b) Type II vernier angle ruler
1- vernier; 2- magnifying glass; 3- jog wheel;
4-block; 5-main ruler; 6-straight ruler; 7-base ruler;
8- Additional ruler; 9- Measuring surface
Figure 1 Vernier angle ruler
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