Where traceability of measurements to si units is not possible and / or not relevant, the same requirements for traceability to, for example, certified reference materials, agreed methods and / or consensus standards, are required as for calibration laboratories ( see 5.6 . 2.1 . 2 ) 2测量无法溯源到si单位或与之无关时,与对校准实验室的要求一样,要求测量能够溯源到诸如有证参考物质、约定的方法和(或)协议标准(见5.6.2.1.2)