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JJF 1692-2018 English PDF

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JJF 1692-2018: Calibration Specification for Eddy Current Conductivity Meters
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Basic data

Standard ID JJF 1692-2018 (JJF1692-2018)
Description (Translated English) Calibration Specification for Eddy Current Conductivity Meters
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A55
Word Count Estimation 15,153
Date of Issue 2018-02-27
Date of Implementation 2018-05-27
Regulation (derived from) AQSIQ Announcement No. 26 of 2018
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine

JJF 1692-2018: Calibration Specification for Eddy Current Conductivity Meters

---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.
(Eddy current meter calibration specification) National Metrology Technical Specification of the People's Republic Eddy current conductivity meter calibration specification Published on.2018-02-27 2018-05-27 implementation The General Administration of Quality Supervision, Inspection and Quarantine issued Eddy current conductivity meter calibration specification Focal Point. National Electromagnetic Measurement Technical Committee Main drafting unit. China Institute of Metrology Liaoning Institute of Metrology Zhenjiang City Metrology Verification Test Center Participated in the drafting unit. Beijing Oriental Metrology and Testing Institute This specification entrusts the National Electromagnetic Measurement Technical Committee to explain The main drafters of this specification. Zheng Lianying (China Institute of Metrology) Liang Guoding (Liaoning Institute of Metrology) Cao Jianqiu (Zhenjiang Metrology Verification Test Center) Participate in the drafters. Jin Haibin (Beijing Oriental Metrology and Testing Institute) Zhao Yating (China Institute of Metrology) Chen Wei (China Institute of Metrology)

table of Contents

Introduction (III) 1 Scope (1) 2 References (1) 3 terms and units of measurement (1) 3.1 International Annealed Copper Standard (1) 3.2 Eddy Current (1) 3.3 Standard penetration depth (1) 3.4 Lifting effect (1) 3.5 Edge Effect (1) 4 Overview (2) 5 Measurement characteristics (2) 5.1 Conductivity meter error limit (2) 6 Calibration conditions (2) 6.1 Environmental conditions (2) 6.2 Measurement standards and other equipment (2) 7 Calibration items and calibration methods (2) 7.1 Calibration Project (2) 7.2 Calibration method (3) 8 calibration result expression (4) 8.1 Calibration Certificate (4) 9 re-study interval (4) Appendix A Example of Measurement Uncertainty Evaluation of Eddy Current Conductivity Calibration Results (5) Appendix B Calibration Original Record Format (8) Appendix C Calibration Certificate Page Format (9)

Introduction

This specification is based on the National Metrology Technical Specification JJF 1071-2010 "Rules for the Preparation of National Metrology Calibration Specifications", JJF 1059.1-2012 Compilation of Measurement Uncertainty and Representation. This specification is the first release. Eddy current conductivity meter calibration specification

1 Scope

This specification applies to measurement non-ranges from 0.58MS/m to 58MS/m (1% IACS to 100% IACS). Ferromagnetic metal conductivity eddy current conductivity meter calibration.

2 reference files

This specification refers to the following documents. GB/T 12966-2008 Aluminum alloy conductivity eddy current test method ASTME1004-09 eddy current method for determining material conductivity [StandardTestMethodforDetermining ElectricalConductivityUsingtheElectromagnetic(Eddy-Current)Method] For dated references, only dated versions apply to this specification; undated quotations The latest version (including all amendments) applies to this specification.

3 terms and units of measure

3.1 International Annealed Copper Standard InternationalAnnealedCopperStandard (IACS) When the temperature is 20 ° C, when the uniform cross section is 1 mm 2 , the length of the copper wire has a resistance of (1/ 58) When Ω, it is specified as 100% international annealed copper standard (ie 100% IACS---100PercentInterna- tionalAnnealedCopperStandard), and the conversion formula of the International System of Units is as shown in equation (1). 100% IACS=58MS/m (1) 3.2 Eddy current eddycurrent An induced current generated on the surface of the conductor and near the surface due to changes in the external magnetic field in time or space. 3.3 Standard penetration depth standarddepthofpenetration In eddy current testing, the eddy current density is reduced to 1/e of the eddy current density of the surface layer of the sample (e is a natural constant, and the value is about The depth δ at 2.71828) is called the standard penetration depth and can be calculated by equation (2). δ= 00μrπfσ (2) In the formula. δ --- standard penetration depth, m; σ --- sample block (standard block and instrument self-calibration standard block) conductivity, S/m; f --- test (probe excitation source) frequency, Hz; 00 --- vacuum magnetic permeability (μ0 = 4π × 10-7), H/m; Rr --- relative permeability, μr for non-ferromagnetic metal material is approximately 1 (actually calculated as 1), dimensionless. 3.4 lifting effect lift-offeffect When the distance between the eddy current detecting coil and the test piece is changed, the impedance vector thereof has a change effect. 3.5 edge effect edgeeffect

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