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Hysteresis and Related Error Mechanisms in the NIST Watt Balance Experiment

机译:NIST瓦特平衡实验中的磁滞和相关误差机制

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摘要

The NIST watt balance experiment is being completely rebuilt after its 1998 determination of the Planck constant. That measurement yielded a result with an approximately 1×10−7 relative standard uncertainty. Because the goal of the new incarnation of the experiment is a ten-fold decrease in uncertainty, it has been necessary to reexamine many sources of systematic error. Hysteresis effects account for a substantial portion of the projected uncertainty budget. They arise from mechanical, magnetic, and thermal sources. The new experiment incorporates several improvements in the apparatus to address these issues, including stiffer components for transferring the mass standard on and off the balance, better servo control of the balance, better pivot materials, and the incorporation of erasing techniques into the mass transfer servo system. We have carried out a series of tests of hysteresis sources on a separate system, and apply their results to the watt apparatus. The studies presented here suggest that our improvements can be expected to reduce hysteresis signals by at least a factor of 10—perhaps as much as a factor of 50—over the 1998 experiment.
机译:在1998年确定普朗克常数后,NIST瓦特平衡实验正在完全重建。该测量产生相对标准不确定度约为1×10 -7 的结果。由于实验的新化身的目标是不确定性降低十倍,因此有必要重新检查系统误差的许多来源。磁滞效应占预计不确定性预算的很大一部分。它们来自机械,磁和热源。新实验对设备进行了多项改进,以解决这些问题,包括用于在天平上和下转移质量标准的刚性部件,对天平的更好的伺服控制,更好的枢轴材料以及在传质伺服系统中采用了擦除技术系统。我们在单独的系统上进行了一系列磁滞源测试,并将其结果应用于瓦特仪器。此处提出的研究表明,与1998年的实验相比,我们的改进有望使磁滞信号降低至少10倍(也许多达50倍)。

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