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JJG 21-2008

Chinese Standard: 'JJG 21-2008'
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JJG 21-2008English579 Add to Cart Days<=5 Verification Regulation of Micrometer Valid JJG 21-2008
JJG 21-2008Chinese21 Add to Cart <=1-day [PDF from Chinese Authority, or Standard Committee, or Publishing House]

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Standard ID JJG 21-2008 (JJG21-2008)
Description (Translated English) Verification Regulation of Micrometer
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A52
Classification of International Standard 17.040
Word Count Estimation 25,259
Date of Issue 2008-03-25
Date of Implementation 2008-09-25
Older Standard (superseded by this standard) JJG 21-1995
Quoted Standard JJF 1001; JJF 1059; JJF 1094; GB/T 1216; GB/T 20919; JB/T 2989
Drafting Organization Heilongjiang Academy of measurement verification test
Administrative Organization National Engineering geometric parameters measured Technical Committee
Regulation (derived from) ?AQSIQ Announcement 2008 No.35
Issuing agency(ies) State Administration of Quality Supervision, Inspection and Quarantine
Summary This standard applies to indexing is 0. 01mm, the measurement limit to 500mm outside diameter micrometer, measurement limit to the thickness of 25mm, wall thickness micrometer, number and resolution of 0. 001mm, 0. 0001mm, measuring 500mm explicit limit to the outside micrometer diameter initial verification, subsequent test and use test.

JJG 21-2008
Verification Regulation of Micrometer
State verification procedures People's Republic of China
Posted 2008-03-25
2008-09-25 implementation
The State Administration of Quality Supervision, Inspection and Quarantine released
Micrometer test procedures
Replacing JJG 21-1995
The regulations by the State Administration of Quality Supervision, Inspection and Quarantine, 2008 March 25 ratification and
From September 25, 2008 into effect.
NFP. National Engineering Geometrical Parameters Measurement Technology Committee
Drafted by. Heilongjiang Provincial Academy of verification test
Jilin Institute of Metrology
This procedure works commissioned by the National geometric parameter measurement technology committee responsible for the interpretation
The main drafters of this procedure.
Zhang Liping (Heilongjiang Provincial Academy of verification test)
Ma Zhonghuan (Jilin Institute of Metrology)
Dou Yanhong (Jilin Institute of Metrology)
Drafters participate.
Xiaoliang (Heilongjiang Provincial Academy of verification test)
Wang Li (Harbin metrological verification tests)
table of Contents
1 Scope (1)
2. Referenced Documents (1)
3 Overview (1)
4 metering performance requirements (3)
4.1 micrometer screw axial movement and radial swing string (3)
4.2 anvil micrometer screw with relative offset measuring surface (3)
Force 4.3 (3)
4.4 groove width and width difference (3)
4.5 Relative position of the pointer and the dial (3)
4.6 differential cylinder tapered end surface edge to the distance between the fixed sleeve groove surface (3)
4.7 Differential cylinder end face of the tapered surface of the fixed position of the sleeve relative to the millimeter reticle (3)
4.8 measuring surface flatness (3)
4.9 digital outside micrometer of Repeatability (3)
4.10 digital outside micrometer anywhere value drift (4)
4.11 two parallel measuring surfaces (4)
4.12 Indication Error (4)
4.13 digital outside micrometer sub-divisional error (5)
4.14 The amount of proofreading lever (5)
5 General Requirements (6)
5.1 Appearance (6)
5.2 Interaction of each part (6)
6 Control of measuring instruments (6)
6.1 Verification condition (6)
6.2 Verification Project (6)
6.3 Verification Methods (7)
Processing 6.4 Verification Results (11)
6.5 test cycle (11)
Appendix A micrometer indication error of measurement results Uncertainty Evaluation (12)
Appendix B number micrometer indication error of measurement results Uncertainty Evaluation (16)
Appendix C calibration certificate and test results in the notice page format (20)
Micrometer test procedures
1 Scope
The order applies to indexing is 0.01mm, measurement limit to 500mm outer diameter micrometer; Measurement limit to
Thickness 25mm wall thickness micrometer; and a resolution of 0.001mm, 0.0001mm, measurement limit to
The significant number of 500mm outside micrometer initial verification, subsequent verification and in-service inspection.
2 Citations
The regulations cited in the following documents.
JJF1001-1998 common measurement terms and definitions
JJF1059-1999 Evaluation and Expression of Uncertainty in Measurement
JJF1094-2002 measuring instrument characteristics evaluation
GB/T 1216-2004 outside micrometer
GB/T 20919-2007 electronic digital outside micrometer
JB/T 2989-1999 micrometer thickness
When using this procedure, it should pay attention to using the currently valid version of the documents cited.
3 Overview
Micrometer by foot frame, anvil, micrometer screw, force measuring device, locking device and reading devices and other components. FIG.
FIG 1,2,3,4,5,6.
FIG. 1 is a fixed anvil micrometer
1- foot frame; 2- anvil; 3- micrometer screw; 4- locking device; 5- fixed casing;
7- force measuring device;; 8- differential thermal insulation 6- cylinder
Figure 2 anvil is replaceable or adjustable micrometer
1- anvil fastening bolts; 2- anvil; 3- foot frame; 4- micrometer screw; 5- thermal insulation;
6- force measuring device; 7- differential cylinder; 8- fixed sleeve; 9- locking device
Related standard:   JJG 21-2010  JJG 24-2016
Related PDF sample:   JJG 517-2016  JJF 1561-2016
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