A PRECISE MEASUREMENT OF QHR IN NIM

• 作 者: L.Bliek G.Hein W.Kowalski K.J.Ebeling H.Bruus
• 机 构: PTB,Braunschweig,Germany,PTB,Braunschweig,Germany,Technical University,Braunschweig,Germany,Technica
• 出 处: 计量学报
• 发表日期: 1991年S1期
• 关键词: completed uncertainty drift precise links specially magnet automatically termina

In this paper an equipment for precise measurement of QHR in NIM is described.The essential parts in this equipment are a resistance comparator of one-to-one ratio with a comparison uncertainty of 3×10-8 and two specially designed resistor networks for determination of ratio between 12906.4035Ω of QHR at i=2 and 10kΩ or 1kΩ The transfering procedure from QHR to 10kΩ or 1kΩ can be completed easily with this equipment by a few one to one comparisons with a total uncertainty of 5×10-8

In this paper an equipment for precise measurement of QHR in NIM is described. Essential parts in this equipment are a resistance comparator of one-to-one ratio with a comparison uncertainty of 3 × 10-8 and two specially designed resistor networks for determination of ratio between 12906.4035Ω of QHR at i = 2 and 10kΩ or 1kΩ The transfering procedure from QHR to 10kΩ or 1kΩ can be completed easily with this equipment by a few one to one comparisons with a total uncertainty of 5 × 10-8