参考标准
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定义
在给定地点具有最高计量质量的测量标准，用于校准该组织的工作标准和其他仪器。
解释
A national metrology institute maintains primary reference standards — for example, NIST’s primary mass standard is a platinum-iridium kilogram prototype traceable to the 2019 SI redefinition via Kibble balance. Laboratories maintain secondary reference standards calibrated against primary ones: a 1 kg stainless steel reference weight with uncertainty of ±0.05 mg might serve as the reference for an entire factory’s weighing instruments.
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