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1.引言标准测力机之间的比对只有当力值不确定度达到小于1×10~(-4)时,才有计量上的意义。用于比对的各负荷传感器必须满足特殊的计量要求:(1)测量与试验室条件下的温度变化无关。(2)蠕变小,并有可能在测量中修正这个影响。(3)测量与在标准测力机中所产生的干扰力(横向力、弯矩和扭矩)无关。(4)在比对期间(在国标比对中,大致为两
1. INTRODUCTION The comparison between standard force measuring machines is of metrical significance only when the uncertainty of the force value is less than 1 × 10 ~ (-4). Each load cell used for comparison must meet specific metering requirements: (1) The measurement is independent of the temperature change in the laboratory. (2) small creep, and possible to correct this effect in the measurement. (3) The measurement is independent of the disturbing forces (transverse forces, bending moments and torques) generated in standard dynamometers. (4) In the comparison period (in the national standard comparison, roughly two