1.1 本试验方法提供了直流磁滞回线图程序，用于测定环形、螺旋缠绕环形、链环、双搭接Epstein磁芯或其他标准形状材料的基本磁性，这些材料可以由铸造、压实、烧结、锻造或轧制材料切割、冲压、机加工或研磨而成。它包括在连续扫描磁化条件下进行的初始和正常磁化曲线测试以及磁滞回线测定。在测量过程中，可以在曲线的不同部分手动或自动改变扫描速率。 1.2 本试验方法中描述的设备和程序最适用于固有矫顽力小于约100奥氏硬度[8 kA/M]的软材料和半硬材料。 应根据试验方法对具有较高固有矫顽力的材料进行试验 A977/A977M . 1.3 以惯用（cgs emu和英寸磅）或国际单位制表示的值和方程应单独视为标准。在本标准中，国际单位制显示在括号中。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。合并两个系统的值可能会导致不符合本标准。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 与逐点弹道测试方法相比，滞回曲线图允许更快速有效地收集数据 A341/A341M 和 A596/A596M . 计算机自动化系统提供的高测量点密度通常用于变压器、电机和继电器等电气部件的计算机辅助设计。 5.2 滞回曲线图尤其适用于半刚性梁的测试- 硬磁和硬磁材料，其中主要关注整个第二象限（退磁曲线）或整个磁滞回线。试验方法 A977/A977M 描述了精确测量硬磁（永磁）材料的特殊要求。 5.3 不建议使用滞回图测量初始渗透率， µ 一、 具有高磁导率的材料，如镍铁、非晶和纳米晶材料，由于与积分器漂移相关的误差；在这些情况下，试验方法 A596/A596M 是一种更合适的方法。 5.4 如果试样代表批量样品或批次，则该试验方法非常适合于设计、规范验收、服务评估以及研发。

1.1 This test method provides dc hysteresigraph procedures for the determination of basic magnetic properties of materials in the form of ring, spirally wound toroidal, link, double-lapped Epstein cores, or other standard shapes that may be cut, stamped, machined, or ground from cast, compacted, sintered, forged, or rolled materials. It includes tests for initial and normal magnetization curves and hysteresis loop determination taken under conditions of continuous sweep magnetization. Rate of sweep may be varied, either manually or automatically at different portions of the curves during measurement. 1.2 The equipment and procedures described in this test method are most suited for soft and semi-hard materials with intrinsic coercivity less than about 100 Oersteds [8 kA/M]. Materials with higher intrinsic coercivities should be tested according to Test Method A977/A977M . 1.3 The values and equations stated in customary (cgs-emu and inch-pound) or SI units are to be regarded separately as standard. Within this standard, SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Hysteresigraphs permit more rapid and efficient collection of data as compared to the point by point ballistic Test Methods A341/A341M and A596/A596M . The high measurement point density offered by computer-automated systems is often required for computer aided design of electrical components such as transformers, motors, and relays. 5.2 Hysteresigraphs are particularly desirable for testing of semi-hard and hard magnetic materials, where either the entire second quadrant (demagnetization curve) or entire hysteresis loop is of primary concern. Test Method A977/A977M describes the special requirements for accurate measurement of hard magnetic (permanent magnet) materials. 5.3 Hysteresigraphs are not recommended for measurement of initial permeability, µ i , of materials with high magnetic permeability such as nickel-iron, amorphous, and nanocrystalline materials due to errors associated with integrator drift; in these cases, Test Method A596/A596M is a more appropriate method. 5.4 Provided the test specimen is representative of the bulk sample or lot, this test method is well suited for design, specification acceptance, service evaluation, and research and development.