Abstract：According to the technical requirements of recommendation OIML R111 and JJG99-2006 verification regulation of weights, weights comparisons including 100g and 200mg are organized by National Institute of Metrology (NIM), as a pilot laboratory. There are 113 laboratories to participate the weights comparison for 100 g and 200 mg. The comparison manner of petal type is used in the transfer process of weight sample. The results of comparison are evaluated in accordance with normalized error En. The results from 2009 to 2010 show weight calibration results of 6 participating laboratories are not satisfied, which is 5.4 % of total results. The possible causes of these results are analyzed.
［1］International Recommendation OIML R111-1 Edition 2004(E). Weights of classes E1,E2,F1,F2,M1,M1-2,M2,M2-3 and M3［S］. 2004.
［2］Davis R S. Determining the magnetic properties of 1 kg mass standards［J］. J Res National Institute of Standards and Technology,1995, 100:209-225.
［3］王健,姚弘,张跃,等. 砝码磁化率对质量测量过程的影响［J］. 计量学报,2009,30（6）:539-542.
［4］王肖磊,王健,钟瑞麟,等. 砝码质量测量中的空气密度测量装置的研究［J］. 计量学报,2011,32(1):40-43.
［5］JJG 99—2006砝码国家检定规程［S］.2006.
［6］JJF 1059—1999测量不确定度评定与表示［S］. 1999.
［7］JJF 1117—2010计量比对［S］. 2010.
2013, Vol. 34 
