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In calibrations of force measuring instruments using dead-weight type force standard machines, increasing the moving speed of dead-weights in linkage-weight stacks generally improves working efficiency but makes the calibration uncertainty worse due to oscillation of the weights. This conflict can be solved by introducing variable speed control of the linkage-weight stacks to drive the weights quickly...
Renovation work has been carried out to separate the 3 kN/500 N dead-weight type force standard machine (DWM) at the National Metrology Institute of Japan. Two loading frames and a common structural frame were newly manufactured. No significant changes were observed in the calibration results of several force transducers before and after the renovation; in some cases, there has even been improvement...
Recently, discussion has arisen on how to estimate uncertainty due to the creep behavior of force measuring devices under calibration. There is a proposal to estimate the uncertainty based on variations of readings arising from loading speed differences between preloading and subsequent calibration cycles. However, in the case of force standard machines with linkage weights, these differences come...
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