JJF 1941-2021Calibration Specification for Material Measures of Length Measuring Instrument with Optical Principle (English PDF)

1 Scope(1)

2 References(1)

3 Overview(1)

3.1 Square ruler(1)

3.2 Knife-edged square (1)

3.3 Reticle Arbor (2)

3.4 Tapered mandrel (2)

3.5 Standard mandrel(2)

3.6 Cube(3)

3.7 Eccentric shaft(3)

3.8 Special glass ruler (4)

4 Metrological characteristics(4)

4.1 Square ruler(4)

4.2 Knife-edged square (4)

4.3 Reticle mandrel (5)

4.4 Cone mandrel (5)

4.5 Standard mandrel(5)

4.6 Cube(5)

4.7 Eccentric shaft (6)

4.8 Special glass ruler (6)

5 Calibration conditions(6)

5.1 Environmental conditions (6)

5.2 Measuring standards and other equipment (6)

5.3 Other conditions (9)

6 Calibration Items and Calibration Methods(9)

6.1 Square ruler(9)

6.2 Knife-edged square (9)

6.3 Reticle mandrel (11)

6.4 Tapered mandrel (12)

6.5 Standard Mandrel(14)

6.6 Cube(14)

6.7 Eccentric shaft (17)

6.8 Special glass ruler (17)

7 Expression of Calibration Results(18)

8 Recalibration interval(18)

Appendix A Evaluation of Uncertainty in Measurement of Flatness of Square Square Ruler (19)

Appendix B Evaluation of Measurement Uncertainty of Angle Deviation of Knife-edge Square (22)

Appendix C Measurement Uncertainty Evaluation of the Deviation Between the Crosshair of the Crosshair Mandrel and the Line Connecting the Centers of the Two Center Holes (24)

Appendix D Measurement Uncertainty Evaluation of Cone Half Angle Deviation of Cone Mandrel (26)

Appendix E Evaluation of Measurement Uncertainty of Standard Mandrel Runout (29)

Appendix F Measurement Uncertainty Evaluation of Square Working Angle Deviation (31)

Appendix G Measurement Uncertainty Evaluation of Eccentric Shaft Eccentricity (33)

Appendix H Evaluation of Measurement Uncertainty of Grading Line Deviation of Special Glass Ruler (35)

Appendix I Calibration Certificate Contents and Inner Page Format (37)

Introduction

JJF 1071-2010 "Rules for Compilation of National Metrology Calibration Standards", JJF 1001-2011 "General Metrology Terminology and Definition", JJF 1059.1-2012 "Evaluation and Expression of Measurement Uncertainty" jointly constitute the support for the formulation of this calibration specification the basic series of specifications:

This specification is published for the first time:

Specification for Calibration of Optical Instrument Gauge

1 Scope

This specification is applicable to four-edged square ruler, knife-edged square ruler, reticle mandrel, cone mandrel, standard mandrel, square Calibration of optical instrument inspection tools (hereinafter referred to as inspection tools) such as body, eccentric shaft and special glass ruler:

2 References

This specification references the following documents:

JJG56 Tool Microscope JJG57 Optical, digital display dividing head JJG571 Reading and measuring microscope JJF 1093 Projector Calibration Specification JJF 1094-2002 Evaluation of Measuring Instrument Characteristics JJF 1109 Calibration specification for runout tester for dated references, only the dated version applies to this specification; for undated references document, its latest version (including all amendments) applies to this specification:

3 Overview

3.1 Square ruler

The square ruler is a measuring instrument for measuring flatness and parallelism, mainly used to measure the straight line of workpiece or guide rail:

Degree and parallelism, such as tool microscope, straightness of vertical and horizontal slide movement of projector, and workbench and vertical and horizontal slide Parallelism of the direction of plate movement:

The four-sided square ruler is generally based on its working length as the model specification: The common model specification is L200mm, and its working length the degree is:200mm, and the overall dimension is 205mm: The working face includes main working face, side working face, bottom working face, the structure diagram is shown in Figure 1:

Figure 1 Schematic diagram of the structure of the square ruler

3.2 Knife-edged square Knife-edge square is a measuring instrument with a standard right angle composed of knife-edge edges, mainly used for measuring workpieces or guides:

The straightness and verticality of the track, such as the verticality of the vertical and horizontal slides of the tool microscope and projector:

Knife-edge square has two structures: triangle and rectangle: Generally, the working length is used as the model specification, and the common model