1.1 本试验方法包括测定由平轧产品制成的层压环或环形带绕磁芯的几种交流磁特性。 1.2 本试验方法涵盖了确定特定铁芯损耗、特定激励功率和功率和音频（50 Hz至20 000Hz）。 1.3 由于使用了反馈控制功率放大器，该测试方法非常适合于在磁化曲线拐点以上的磁通密度下测定交流磁特性，特别适用于高饱和铁钴合金（例如，规范中列出的合金 A801型 )，尽管该测试方法的使用不限于特定类型的材料。 1.4 本试验方法应与实践结合使用 A34/A34米 和术语 340美元 . 1.5 以国际单位制或英磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不完全相等；因此，每个系统应独立使用。组合两个系统的值可能导致不符合标准。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《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 本试验方法是试验方法的衍生 A697/A697米 专为测试测试方法中未涵盖的环形铁芯而设计 A697/A697米 并且用于在磁化曲线拐点以上的磁通密度下进行测试。 3.2 试样尺寸通常为1 在里面至1.25英寸。[25.4 内径为1。 5英寸。外径[38.1 mm]，重量范围为30 g至60g。如果适当选择测试设备，则可以测试的芯的总体尺寸没有明显限制。如果需要基本材料特性 5.1 必须遵守。 3.3 该试验方法的再现性和可重复性使得该试验方法适用于设计、规范验收、服务评估和研发。 3.4 在磁通密度接近饱和的正弦磁通条件下进行测试时，将出现高峰值磁化波形，所使用的测试仪器必须具有至少3的峰值因子能力； 否则将获得错误的结果。

1.1 This test method covers the determination of several ac magnetic properties of either laminated ring or toroidal tape wound cores made from flat rolled product. 1.2 This test method covers test equipment and procedures for determination of specific core loss, specific exciting power, and peak permeability for power and audio frequencies (50 Hz to 20 000 Hz) under sinusoidal flux conditions. 1.3 This test method, because of the use of a feedback-controlled power amplifier, is well suited for determination of ac magnetic properties at magnetic flux densities above the knee of the magnetization curve and is particularly useful for testing of high-saturation iron-cobalt alloys (for example, alloys listed in Specification A801 ), although use of this test method is not restricted to a particular type of material. 1.4 This test method shall be used in conjunction with Practice A34/A34M and Terminology A340 . 1.5 The values stated in either SI units or inch-pound units are to be regarded separately as standard. 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 non-conformance with the standard. 1.6 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. 1.7 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 is a derivative of Test Method A697/A697M specifically designed for testing of toroidal cores which are not covered in Test Method A697/A697M and for testing at magnetic flux densities above the knee of the magnetization curve. 3.2 Specimen size typically ranges from 1 in. to 1.25 in. [25.4 mm to 31.8 mm] in inside diameter to 1.5 in. [38.1 mm] in outside diameter with weights ranging from 30 g to 60 g. Provided the test equipment is suitably chosen, there is no obvious limit to the overall size of core that can be tested. If basic material properties are desired, then the requirements of 5.1 must be observed. 3.3 The reproducibility and repeatability of this test method are such that this test method is suitable for design, specification acceptance, service evaluation, and research and development. 3.4 When testing under sinusoidal flux conditions at magnetic flux densities approaching saturation, highly peaked magnetizing waveforms will be present, and the test instruments used must have crest factor capabilities of at least 3; otherwise erroneous results will be obtained.