2006 年 126 巻 12 号 p. 1223-1230
Four Zener voltage standards ( Fluke 732B ) belonging to National Metrology Institute of Japan (NMIJ), AIST have contained in a particularly designed box that is called an “up-graded box". This box need for enhancing the insulation resistance occurred between the 1.018 V output terminal and chassis of the Zener voltage standard, because the 1.018 V output voltages have 1kΩ output-resistance. Hence, affect refer to best measurement capability 4 nV (k=1) of the 1.018 V output voltage arises from load effect between the insulation resistance and 1kΩ output-resistance. Moreover, this insulation resistance has an effect on the environmental humidity-change of 40%RH, 50%RH, 60%RH, 65%RH and 70%RH. Therefore, this paper revealed type B standard uncertainty of the 1.018 V output voltages arose by the humidity characteristic of the insulation resistance.
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