抄録
Force standard machines (FSMs) of Japan consist of deadweight type, hydraulic amplification type and lever amplification type (LM). The LM has an advantage of compactness, however, it has a drawback of long term instability of the amplitude ratio due to abrasion of knife edges caused by repeated calibrations. Therefore, periodic comparison with other FSMs is necessary to assure the performance of the LM. We made a comparison of the LM with other FSMs and verified the performance of the LM.
