1.1 这些试验方法包括测定相对湿度( 注1 )非磁性固体电介质材料的复介电常数（介电常数和损耗因子）。 注1: “相对”一词经常被省略。 1.1.1 试验方法A 用于精确成形到波导内部尺寸的试样。 1.1.2 试验方法B 用于指定几何形状的试样，这些试样占据谐振腔内很小的空间。 1.1.3 试验方法C 与试验方法a和B相比，使用的谐振腔对试样尺寸、几何形状和放置的限制更少。 1.2 尽管这些测试方法是在微波频谱上使用的，从0。 5至50.0 GHz，每个倍频程增加通常需要不同的发生器和较小的测试波导或谐振腔。 1.3 使用特殊的高温波导和谐振腔进行高温测试。 1.4 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的数值为英寸-磅单位，仅供参考，不被视为标准。 1.5 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。 1.6 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 传输线、天线、天线罩、谐振器、移相器等部件的设计计算需要了解工作频率下的复介电常数值。相关的微波测量用分布场技术代替低- 频率集总电路阻抗技术。 4.2 有关介电常数重要性的更多信息，请参见测试方法 D150型 . 4.3 这些测试方法对于陶瓷、玻璃和有机电介质材料的规范验收、服务评估、制造控制和研发非常有用。

1.1 These test methods cover the determination of relative ( Note 1 ) complex permittivity (dielectric constant and dissipation factor) of nonmagnetic solid dielectric materials. Note 1: The word “relative” is often omitted. 1.1.1 Test Method A is for specimens precisely formed to the inside dimension of a waveguide. 1.1.2 Test Method B is for specimens of specified geometry that occupy a very small portion of the space inside a resonant cavity. 1.1.3 Test Method C uses a resonant cavity with fewer restrictions on specimen size, geometry, and placement than Test Methods A and B. 1.2 Although these test methods are used over the microwave frequency spectrum from around 0.5 to 50.0 GHz, each octave increase usually requires a different generator and a smaller test waveguide or resonant cavity. 1.3 Tests at elevated temperatures are made using special high-temperature waveguide and resonant cavities. 1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are inch-pound units that are provided for information only and are not considered standard. 1.5 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. 1.6 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 Design calculations for such components as transmission lines, antennas, radomes, resonators, phase shifters, etc., require knowledge of values of complex permittivity at operating frequencies. The related microwave measurements substitute distributed field techniques for low-frequency lumped-circuit impedance techniques. 4.2 Further information on the significance of permittivity is contained in Test Methods D150 . 4.3 These test methods are useful for specification acceptance, service evaluation, manufacturing control, and research and development of ceramics, glasses, and organic dielectric materials.