1.1 本试验方法包括使用25 cm Epstein试验架和25 cm双搭接磁芯在工频（25至400 Hz）下对基本扁平轧制磁性材料的磁性进行试验。 1.2 通过对爱泼斯坦磁芯样品的测量确定材料的磁性，磁芯和测试线圈被视为构成串并联等效电路( 图A1.1 )对于励磁基频，其中视在并联电感， L 1. ，和阻力， R 1. ，可归因于试样。 1.3 本试验方法适用于测定铁芯损耗、均方根伏安、均方根励磁电流、无功电压- 交流磁化下扁平轧制磁性材料的安培数和相关特性。 1.4 该试验方法的频率范围通常为50至60 Hz的商用电源频率。也可以在25至400 Hz的频率下进行测量。本试验方法通常用于感应强度高达10 kG[1.0 T]的无取向电工钢和感应强度高达15 kG[1.5 T]的晶粒取向电工钢。 1.5 对于无功特性，磁通和电流波形都存在局限性。在其有效电感范围内，无功电压表适用于测量无功伏安和电感磁导率。对于这些特性的测量，建议将测试电感限制在足够低的值，以使VAR的测量值相差不超过15 % ( 注1 )根据励磁伏安和铁心损耗的测量值计算得出。 注1: 考虑到磁路的非线性性质，对本试验方法进行了限制，这导致基于电压、电流和谐波抑制后电流的基频分量的VAR与根据均方根电流、电压和瓦特值计算的VAR之间存在差异，其中一个或多个量为非正弦量。 1.6 本试验方法应结合实践使用 A34/A34M . 1.7 使用的术语、符号和定义的解释可在本试验方法的各个章节中找到。定义和符号的官方列表可在术语中找到 A340型 . 1.8 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，除与计算有关的章节外，括号中显示了国际单位制，其中各单位制有单独的章节。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。 1.9 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。 1.10 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====== 3.1 本试验方法可用于测定平轧磁性材料的比铁损、比无功功率、比励磁功率、电感磁导率和阻抗磁导率，对于对称磁化的试样，其感应范围大，频率高达400 Hz。 3.2 这些测量值由公寓的生产者和使用者使用- 用于质量控制的轧制材料。这些测量中固有的基本假设是，它们可以与扁平轧制材料制成的磁芯的电磁特性相关联。

1.1 This test method covers tests for the magnetic properties of basic flat-rolled magnetic materials at power frequencies (25 to 400 Hz) using a 25-cm Epstein test frame and the 25-cm double-lap-jointed core. 1.2 The magnetic properties of materials are determined from measurements on Epstein core specimens with the core and test coils treated as though they constituted a series-parallel equivalent circuit ( Fig. A1.1 ) for the fundamental frequency of excitation where the apparent parallel inductance, L 1 , and resistance, R 1 , are attributable to the test specimen. 1.3 This test method is suitable for the determination of core loss, rms volt-amperes, rms exciting current, reactive volt-amperes, and related properties of flat-rolled magnetic materials under ac magnetization. 1.4 The frequency range of this test method is normally that of the commercial power frequencies 50 to 60 Hz. It is also acceptable for measurements at frequencies from 25 to 400 Hz. This test method is customarily used on nonoriented electrical steels at inductions up to 10 kG [1.0 T] and for grain-oriented electrical steels at inductions up to 15 kG [1.5 T]. 1.5 For reactive properties, both flux and current waveforms introduce limitations. Over its range of useful inductions, the varmeter is valid for the measurement of reactive volt-amperes (vars) and inductance permeability. For the measurement of these properties, it is suggested that test inductions be limited to values sufficiently low that the measured values of vars do not differ by more than 15 % ( Note 1 ) from those calculated from the measured values of exciting volt-amperes and core loss. Note 1: This limitation is placed on this test method in consideration of the nonlinear nature of the magnetic circuit, which leads to a difference between vars based on fundamental frequency components of voltage and current and current after harmonic rejection and vars computed from rms current, voltage, and watt values when one or more of these quantities are nonsinusoidal. 1.6 This test method shall be used in conjunction with Practice A34/A34M . 1.7 Explanation of terms, symbols, and definitions used may be found in the various sections of this test method. The official list of definitions and symbols may be found in Terminology A340 . 1.8 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 except for the sections concerning calculations where there are separate sections for the respective unit systems. 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. 1.9 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. 1.10 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 ====== 3.1 This test method may be used to determine the specific core loss, specific reactive power, specific exciting power, inductance permeability, and impedance permeability of flat-rolled magnetic materials over a wide range of inductions and at frequencies up to 400 Hz for symmetrically magnetized test samples. 3.2 These measurements are used by the producer and user of the flat-rolled material for quality control purposes. The fundamental assumption inherent in these measurements is that they can be correlated with the electromagnetic characteristics of a core fabricated from the flat-rolled material.