1.1 该测试方法提供了测定阻抗渗透率（μ z )在正弦电流（正弦H）激励条件下。使用具有均匀横截面和闭合磁通路径（无气隙）的层压环形铁芯、带绕环形铁芯和链式层压铁芯形式的试样。该方法旨在作为测定厚度小于或等于0.025英寸的铁磁性条带磁性性能的手段。[0.635毫米]。 1.2 本试验方法应与实践中的适用段落结合使用 A34/A34米 . 1.3 以惯用单位（cgs-emu和英磅）或国际单位制表示的数值和方程式应单独视为标准。在本标准中，国际单位制单位显示在括号内，但有关计算的章节除外，其中各单位制有单独的章节。 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。将两个系统的值合并可能导致不符合本标准。 1.4 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。 1.5 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====== 4.1 通过该方法确定的渗透率为阻抗渗透率。 阻抗磁导率是磁通密度峰值的比值( B 最大值 )假设的峰值磁场强度( H z )而不考虑相位。与正弦通量（正弦B）条件下的测试相比，该方法确定的渗透率在数值上更低，因为对于给定的测试信号频率，通量变化率( 分贝/分 )更高。 4.2 该测试方法适用于在工频（50 Hz至60Hz）至低于材料的最大磁导率点（磁化曲线的拐点）的中等感应，或直到电流波形出现可见失真。下限是采样面积、次级匝数和所用通量读数电压表灵敏度的函数。在较高的电感下，测量明显失真的磁通产生的电压意味着磁通具有明显的谐波频率分量。 上限由纯正弦电流的可用性给出，这是电源的函数。此外( ≥ 10） 需要初级电路的总串联电阻与初级线圈阻抗的比值。使用合适的测试设备，该测试方法适用于高达1MHz的频率。 4.3 该测试方法适用于设计、规范验收、服务评估、质量控制和研究用途。

1.1 This test method provides a means for determination of the impedance permeability (μ z ) of ferromagnetic materials under the condition of sinusoidal current (sinusoidal H) excitation. Test specimens in the form of laminated toroidal cores, tape-wound toroidal cores, and link-type laminated cores having uniform cross sections and closed flux paths (no air gaps) are used. The method is intended as a means for determining the magnetic performance of ferromagnetic strip having a thickness less than or equal to 0.025 in. [0.635 mm]. 1.2 This test method shall be used in conjunction with those applicable paragraphs in Practice A34/A34M . 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 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. 1.4 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 ====== 4.1 The permeability determined by this method is the impedance permeability. Impedance permeability is the ratio of the peak value of flux density ( B max ) to the assumed peak magnetic field strength ( H z ) without regard to phase. As compared to testing under sinusoidal flux (sinusoidal B) conditions, the permeabilities determined by this method are numerically lower since, for a given test signal frequency, the rate of flux change ( dB/dt ) is higher. 4.2 This test method is suitable for impedance permeability measurements at very low magnetic inductions at power frequencies (50 Hz to 60 Hz) to moderate inductions below the point of maximum permeability of the material (the knee of the magnetization curve) or until there is visible distortion of the current waveform. The lower limit is a function of sample area, secondary turns, and the sensitivity of the flux-reading voltmeter used. At higher inductions, measurements of flux-generated voltages that are appreciably distorted mean that the flux has appreciable harmonic frequency components. The upper limit is given by the availability of pure sinusoidal current, which is a function of the power source. In addition, a large ratio ( ≥ 10) of the total series resistance of the primary circuit to the primary coil impedance is required. With proper test apparatus, this test method is suitable for use at frequencies up to 1 MHz. 4.3 This test method is suitable for design, specification acceptance, service evaluation, quality control, and research use.