1.1 本试验方法包括在轭型试验夹具中使用片状试样在工频（50和60 Hz）下对扁铸非晶磁性材料的各种磁性进行试验。它规定使用单层或多层试样进行测试。 注1: 该测试方法仅适用于50和60 Hz的频率，但通过适当的仪器和测试方法中体现的测试和校准原则的应用，它被认为适用于25到400 Hz的频率范围内的测试 赫兹。 1.2 本试验方法提供了在中等和高磁通密度下的比磁芯损耗、比励磁功率和交流峰值磁导率的试验，但仅限于直流矫顽力为0.07 Oe[5.57 a/m]或以下的极软磁性材料。 1.3 该试验方法还提供了根据磁场强度高达约2 Oe[159 A/m]时总励磁电流的测量峰值计算交流峰值磁导率的程序。 1.4 符号和缩写定义的解释见本试验方法的文本。术语中列出了官方符号和定义 A340型 . 1.5 本试验方法应结合实践使用 A34/A34M . 1.6 以习惯单位（cgs-emu和英寸-磅）或国际单位制表示的值应单独视为标准值。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。 1.7 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。 1.8 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====== 4.1 本试验方法为测定非晶磁性材料的各种交流磁性提供了一种令人满意的方法。它的开发是为了补充环形和Epstein样本的测试。对于非晶材料的环形试样的测试，请参阅测试方法 A912/A912M . 4.2 本文所述程序适用于非晶磁性材料的制造商和用户用于材料规范验收和制造控制。 注2: 本试验方法主要用于50和60 Hz下热、磁退火和扁平非晶带材的磁性试验。13或14 kG[1.3或1.4 T]时的比铁芯损耗、13或14 kG[1.3或1.4 T]时的比励磁功率以及磁通密度， B 在1 Oe[79.6 A/m]时，是评估功率级非晶材料的推荐参数。

1.1 This test method covers tests for various magnetic properties of flat-cast amorphous magnetic materials at power frequencies (50 and 60 Hz) using sheet-type specimens in a yoke-type test fixture. It provides for testing using either single- or multiple-layer specimens. Note 1: This test method has been applied only at frequencies of 50 and 60 Hz, but with proper instrumentation and application of the principles of testing and calibration embodied in the test method, it is believed to be adaptable to testing at frequencies ranging from 25 to 400 Hz. 1.2 This test method provides a test for specific core loss, specific exciting power and ac peak permeability at moderate and high flux densities, but is restricted to very soft magnetic materials with dc coercivities of 0.07 Oe [5.57 A/m] or less. 1.3 The test method also provides procedures for calculating ac peak permeability from measured peak values of total exciting currents at magnetic field strengths up to about 2 Oe [159 A/m]. 1.4 Explanation of symbols and abbreviated definitions appear in the text of this test method. The official symbols and definitions are listed in Terminology A340 . 1.5 This test method shall be used in conjunction with Practice A34/A34M . 1.6 The values stated in either 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. 1.7 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. 1.8 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 ====== 4.1 This test method provides a satisfactory means of determining various ac magnetic properties of amorphous magnetic materials. It was developed to supplement the testing of toroidal and Epstein specimens. For testing toroidal specimens of amorphous materials, refer to Test Method A912/A912M . 4.2 The procedures described herein are suitable for use by manufacturers and users of amorphous magnetic materials for materials specification acceptance and manufacturing control. Note 2: This test method has been principally applied to the magnetic testing of thermally, magnetically annealed, and flattened amorphous strip at 50 and 60 Hz. Specific core loss at 13 or 14 kG [1.3 or 1.4 T], specific exciting power at 13 or 14 kG [1.3 or 1.4 T], and the flux density, B , at 1 Oe [79.6 A/m] are the recommended parameters for evaluating power grade amorphous materials.