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JJF 1906-2021 English PDF

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JJF 1906-2021: Calibration Specification for Constant Magnetic Field Coils
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Basic data

Standard ID JJF 1906-2021 (JJF1906-2021)
Description (Translated English) Calibration Specification for Constant Magnetic Field Coils
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A55
Word Count Estimation 18,188
Issuing agency(ies) State Administration for Market Regulation

JJF 1906-2021: Calibration Specification for Constant Magnetic Field Coils

---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 Constant Magnetic Field Coils National Metrology Technical Specifications of the People's Republic of China Constant magnetic field coil calibration specification Released on 2021-02-23 2021-08-23 implementation Issued by the State Administration for Market Regulation Constant magnetic field coil calibration specification Focal point. National Electromagnetic Metrology Technical Committee Main drafting unit. Zhejiang Institute of Metrology The first-level measurement station of weak magnetic field for defense technology industry Participating in the drafting. Hunan Yongyi Technology Co., Ltd. This specification entrusts the National Electromagnetic Metrology Technical Committee to be responsible for the interpretation The main drafters of this specification. Yu Zhishu (Zhejiang Institute of Metrology) Cheng Huafu (Level 1 Measuring Station for Weak Magnetic Field in National Defense Science and Technology Industry) Yan Jing (Zhejiang Institute of Metrology) Participating drafters. Li Xiang (Level 1 Metering Station for Weak Magnetic Field in National Defense Science and Technology Industry) Jian Li (Zhejiang Institute of Metrology) Zhao Wenchun (First-level measurement station of weak magnetic field for defense science and technology industry) Zhu Yonghong (Hunan Yongyi Technology Co., Ltd.)

table of Contents

Introduction (Ⅱ) 1 Scope (1) 2 Reference documents (1) 3 Term (1) 4 Overview (1) 5 Measurement characteristics (2) 5.1 Coil constant KB (2) 5.2 Magnetic field uniformity Δ (2) 6 Calibration conditions (2) 6.1 Environmental conditions (2) 6.2 Measurement standards and other equipment (2) 7 Calibration items and calibration methods (3) 7.1 Calibration items (3) 7.2 Calibration method (3) 8 Calibration result expression (6) 9 Re-calibration interval (7) Appendix A Uncertainty Evaluation Example of Coil Constant (8) Appendix B Internal page format of calibration original record (10) Appendix C Internal Page Format of Calibration Certificate (12)

Introduction

JJF 1071 "Rules for the Compilation of National Metrology and Calibration Specifications", JJF 1001 "General Metrology Terms and Definitions" and JJF 1059.1 "Evaluation and Expression of Measurement Uncertainty" together constitutes a basic series that supports the formulation of this specification specification. This specification is released for the first time. Constant magnetic field coil calibration specification

1 Scope

This specification applies to the calibration of constant magnetic field coils with a coil constant of (1×10-5~1×10-2)T/A.

2 Reference documents

The following documents are cited in this specification. JJF 1013 Commonly used terms and definitions of magnetic measurement For dated reference documents, only the dated version applies to this specification; for all undated references The latest version (including all amendments) is applicable to this specification.

3 Term

The following terms and definitions defined by JJF 1013 apply to this specification. 3.1 Magnetic field coil magneticfieldcoil A coil that reproduces the magnetic field in the form of current flowing through the winding. 3.2 Magnetic field uniformity heterogeneityofmagneticfield In a given area, the uniformity of the magnetic field generated at each point after the magnetic field coil is energized, and the coil constants at different points are commonly used The degree of uniformity is expressed. 3.3 equalareaofmagneticfield The relative difference between the magnetic induction intensity of each point and the center point after the magnetic field coil is energized does not exceed the given value range Of an area.

4 overview

The magnetic field coil is a magnetic measuring tool used to reproduce the magnetic field, which is mainly used in the fields of magnetic measurement and magnetic parameter detection. magnetic According to the structure, the field coil can be divided into solenoid coil, Helmholtz coil, Maxwell coil, Bucker coil, etc.; The current magnetic field dimensions can be divided into single-axis coils, two-axis coils, and three-axis coils. When the current is applied to the winding of the magnetic field coil, the relationship between the strength of the magnetic field and the coil constant and current is as public. Equation (1) shows. B=KBI (1) Where. B---Magnetic induction intensity at the center of the magnetic field coil, T; KB---the coil constant of the magnetic field coil, T/A; I---The current in the winding of the field coil, A.

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