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JJF 1258-2021 English PDF

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JJF 1258-2021: Calibration Specification for Step Gauges
Status: Valid

JJF 1258: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJF 1258-2021	English	359	Add to Cart	3 days [Need to translate]	Calibration Specification for Step Gauges	Valid	JJF 1258-2021
JJF 1258-2010	English	439	Add to Cart	3 days [Need to translate]	Calibration specification for step gauges	Obsolete	JJF 1258-2010
JJF 1258-1990	English	399	Add to Cart	3 days [Need to translate]	(0.5 to 90 ml capacity reference operating technical specifications)	Obsolete	JJF 1258-1990

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Basic data

Standard ID	JJF 1258-2021 (JJF1258-2021)
Description (Translated English)	Calibration Specification for Step Gauges
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A52
Word Count Estimation	15,154
Issuing agency(ies)	State Administration for Market Regulation

JJF 1258-2021: Calibration Specification for Step Gauges

---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 Step Gauges National Metrology Technical Specification of the People's Republic of China Step Gauge Calibration Specifications Published on 2021-12-28 2022-06-28 Implementation Released by the State Administration for Market Regulation Step Gauge Calibration Specifications Replaces JJF 1258-2010 Focal Point. National Technical Committee on Geometric Length Measurement Drafting unit. China Institute of Metrology China Aviation Development Xi'an Aero Engine Co., Ltd. This specification entrusts the National Technical Committee of Geometry and Length Measurement to be responsible for the interpretation Drafters of this specification. Wang Weinong (China Institute of Metrology) Wei Hengzheng (China Institute of Metrology) Zhang Li (China Aviation Development Xi'an Aero Engine Co., Ltd.)

Introduction (Ⅱ) 1 Scope(1) 2 References (1) 3 Terms (1) 4 Overview(1) 5 Metrology Characteristics(3) 5.1 Spacing to zero point elements(3) 5.2 Parallelism(3) 6 Calibration Conditions(3) 6.1 Environmental conditions (3) 6.2 Measurement standards and other equipment(3) 7 Calibration items and calibration methods (3) 7.1 Preparations (3) 7.2 Spacing to zero point feature(4) 7.3 Parallelism(5) 8 Expression of calibration results (5) 9 Recalibration cycle(6) Appendix A Calibration Certificate Calibration Results Page Format(7) Appendix B Measurement Uncertainty Evaluation Example(8)

Introduction

JJF 1001 "General Metrology Terms and Definitions", JJF 1059.1 "Measurement Uncertainty Evaluation and Expression", JJF 1071 "Rules for Compilation of National Metrology Calibration Specifications" together constitute the basic system supporting the formulation of this calibration specification. column file. This specification is the revision of JJF 1258-2010 "Standard Gauge Calibration Specification". Except for editorial changes, the main The technical changes are as follows. --- Define the characteristic elements and spacing, and change the zero plane to zero point elements to meet the requirements of technological development. The new step gauges with balls and cones as characteristic elements are included in the scope of this specification; --- Introduce the concept of directional elements to unify the method specified by the step gauge measurement line; --- Delete the picture of the vertical step gauge in the schematic diagram of the typical step gauge, and mark the relevant terms in the schematic diagram; ---The indicated spacing is the value under the condition of standard reference temperature of 20℃. Previous releases of this specification. ---JJF 1258-2010. Step Gauge Calibration Specifications

1 Scope

This specification applies to the calibration of step gauges whose characteristic elements are plane, spherical and conical. Steps in other design forms The distance gauge can be implemented with reference to this specification.

2 Reference documents

This specification references the following documents. JJF 1071 Rules for Compilation of National Metrology and Calibration Specifications 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 Terminology

3.1 Feature points specifiedpoints A specific point determined by the characteristic element [3.2]. Note. 1 When the feature element is a plane, its feature point is the intersection of the plane and the measurement line [3.6]. 2 When the characteristic element is a sphere, its characteristic point is the center of the sphere. 3 When the characteristic element is a conical surface, its characteristic point is the ball center of the ball probe that is automatically centered in the cone. 3.2 Feature elements specifiedelements The element that reproduces the spacing. The feature point [3.1] of the feature element determines the spacing value of the step gauge. 3.3 Zero element zeroelement The characteristic feature of the starting point of the nominal spacing on the step gauge, usually marked as "0". The characteristic of the measurement line passing through the zero point feature Levy points. 3.4 Orientation elements orientationelements A feature or auxiliary feature on a step gauge that is used to determine the direction of the survey line. The distance between the feature points of the step gauge feature feature. 3.6 Measuringline A reference line for the step gauge to reproduce the spacing. Note. The measurement line passes through the feature point of the zero point feature. All spacings are measured along the measurement line.

4 Overview

The step gauge is a physical standard that realizes multi-dimensional reproduction through a set of characteristic elements arranged in a straight line. Towards elements and characteristic elements. The base body is made of rigid material, and it is convenient to place and fix the step gauge through a certain structural design. matrix is oriented to The vector of elements and characteristic elements, as shown in Figure 1.

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