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本文叙述了高精度长光栅数字显示直接加试验力式标准洛氏及表面洛氏硬度计的原理、结构、检定、测试及其不确定度的计算。该硬度计完全满足了国家计量检定系统ＪＪＧ２０６７－９０金属洛氏硬度计量器具和ＪＪＧ２０６８－９０金属表面洛氏硬度计量器具的要求。该标准硬度计还实现了一计两用，定度硬度块自动化，消除了人为读数读差，提高了工作效率，减轻了操作人员的劳动强度。
This paper describes the principle, structure, verification, testing and calculation of the uncertainty of the Rockwell and surface Rockwell hardness tester with high precision and long grating digital display. The hardness of the national metrology test system to fully meet the JJG2067-90 metal Rockwell hardness measuring instruments and JJG2068-90 Rockwell metal surface hardness measurement equipment requirements. The standard hardness meter also achieved a dual-purpose, the degree of hardness of the block automation, eliminating the readings of human reading, improve work efficiency and reduce the labor intensity of the operator.