Investigation of a deadweight force standard machine with a 1 mN – 10 N range

Gang Hu, Jile Jiang, Tao Li, Zhimin Zhang, Honglei Ji, Lijun Zhuang


A 10 N small force standard machine with air-bearing support has been developed by NIM. Differing from traditional deadweight force standard machines, this machine is equipped with a balance beam supported by air bearing. The weights of the load frame and deadweight hanging system are balanced, and the initial force is extended to 1 mN. Furthermore, there are innovative designs in the load frame and tension force joint. Performance experiments such as sensitivity, repeatability, and rotation effect are carried out. The uncertainty of this machine is evaluated as 1.0×10-4 (k = 2) in the range of 1 mN – 0.5 N, 4.0 × 10-5 (k = 2) in the range of 0.5 N – 10 N. The structure of this force standard machine and its key components are introduced in detail. The performance experimental results and uncertainty evaluation are demonstrated in this paper.

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