Abstract
This paper presents the optimized parameters of continuous (quasi-static) torque calibration by comparing it with the step-by-step (purely static) calibration facilities in order to prove the influence of the procedural conditions on the uncertainty of calibration. The filter setting (low pass Bessel: 0.2Hz, 1.25Hz, 5Hz and 10Hz) and speed of applying torque (≈140–35s/F.S.) were varied to examine the effects of both parameters on the measurement results and to optimize the continuous calibration. The measurement was made by a torque calibration machine (TCM) with two reference torque transducers and the HBM MGCplus ML30B amplifier system.The results of this experiment show the relative deviation between the step-by-step and continuous calibration within ±0.02% of reading that was enough for class 0.2 torque measuring devices (DIN 51309) and torque transfer wrench (DAkkS-DKD-R 3-7) calibration. For the step-by-step measurement, the duration time in each torque step (from applying torque to data record) must be adequate for processing time interval of the filter. For the continuous measurement, the speed of applying torque and filter setting should be optimized for best measurement capability.
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