The Planck constant $h$ is one of the most significant constants in quantumphysics. Recently, the precision measurement of the numeral value of $h$ hasbeen a hot issue due to its important role in establishment for both a new SIand a revised fundamental physical constant system. Up to date, two approaches,the watt balance and counting atoms, have been employed to determine the Planckconstant at a level of several parts in $10^8$. In this paper, the principleand progress on precision measurement of the Planck constant using watt balanceand counting atoms at national metrology institutes are reviewed. Furtherimprovements for the Planck constant determination and possible developments ofa revised physical constant system in future are discussed.
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机译：普朗克常数$ h $是量子物理学中最重要的常数之一。近来，由于$ h $的精确度测量在建立新的SI和修订的基本物理常数系统中都起着重要作用，因此已经成为一个热门问题。迄今为止，已经采用了两种方法，即瓦特平衡法和原子计数法，来确定普朗克常数在10 ^ 8 $中的几个部分。综述了国家计量院利用瓦特平衡和原子计数法精确测量普朗克常数的原理和进展。讨论了普朗克常数确定的进一步改进以及将来修订的物理常数系统的可能发展。
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