A more in-depth discussion of commercially available time and frequency measurement equipment and standards, and how such instrumentation can be used in the metrology laboratory.

市场上可用的时间频率测量设备和标准的更深入的讨论，以及此类仪器如何应用在计量实验室。

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NOTE 6 Traceability to national measurement standards does not necessarily require the use of the national metrology institute of the country in which the laboratory is located.

对国家测量标准的溯源性不要求必须使用实验室据国的国家计量院。

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