There should be traceability to standards (e. g. national, regional or international standards) used in the calibration.

应当有可追溯的校准标准(如国家标准、地区标准或国际标准等)。

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Traceability of airborne particle counter has its own specialty, there is a big difficulty, at home and abroad many people are working to the calibration of airborne particle counter for many years.

尘埃粒子计数器的量值溯源因其特殊性，存在很大难度，多年来国内外都在致力于尘埃粒子计数器的校准研究。

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Then, according to calibration requirements of automatic test systems, the traceability design was presented.

针对自动测试系统的计量保障需求，提出一种自动测试系统溯源性设计方法。

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Then, according to calibration requirements of automatic test systems, the traceability design was presented.

针对自动测试系统的计量保障需求，提出一种自动测试系统溯源性设计方法。

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