1.1这些试验方法包括测定电容器、变压器、断路器和充油电缆中使用的电绝缘液体的折射率和特定光学色散。 1.2描述了两种测试方法，一种是常规方法，另一种是更精确的裁判方法。这两种方法都适用于透明、浅色的绝缘液体。 1.2.1常规方法用于测定这些试验方法中所述的折射率和比色散。 1.2.2当需要进行高精度测试时，使用裁判法。试验方法D1218中描述了这些方法。通过将试验方法D1218中测定的折射色散值除以被测液体的相对密度（比重）（见试验方法D1298）来计算比光色散。 1.3以国际单位制表示的数值应视为标准。 1.4本标准无意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和健康实践，并确定监管限制的适用性。

1.1 These test methods cover the determination of the refractive index and the specific optical dispersion of electrical insulating liquids such as are used in capacitors, transformers, circuit breakers, and oil-filled cables. 1.2 Two test methods are described, a routine method and a more precise referee method. Both methods are applicable to transparent, light-colored, insulating liquids. 1.2.1 The routine method is used to determine refractive index and specific optical dispersion as described in these test methods. 1.2.2 The referee method is used when a test of high accuracy is desired. These methods are described in Test Method D1218. Specific optical dispersion is calculated by dividing the refractive dispersion value determined in Test Method D1218 by the relative density (specific gravity) (see Test Method D1298) of the liquid under test. 1.3 The values stated in SI units are to be regarded as the 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 and health practices and determine the applicability of regulatory limitations prior to use.