Title :
Improvements of Josephson voltage standard in national metrology centre (NMC) Singapore
Author :
Sim, T.Y. ; Tan, V.K.S. ; Liu, L.X.
Author_Institution :
Nat. Metrol. Centre, Singapore Inst. of Stand. & Ind. Res., Singapore
Abstract :
This paper describes the recent performance upgrading of Josephson voltage standard in NMC. It consists of measures to keep the frequency stability of microwave source within /spl plusmn/1 Hz, proper ways of shielding and grounding to minimise spontaneous step transitions during a measurement and methods to reduce combined uncertainty by 10%.
Keywords :
Josephson effect; earthing; electromagnetic shielding; frequency stability; measurement errors; measurement standards; microwave measurement; superconducting junction devices; voltage measurement; Josephson voltage standard; Singapore; combined uncertainty; frequency stability; grounding; microwave source; national metrology centre; performance upgrading; shielding; spontaneous step transitions; Current measurement; Diodes; Electrical resistance measurement; Energy measurement; Frequency measurement; Metrology; Microwave measurements; Stability; Thermal resistance; Voltage measurement;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1996 Conference on
Conference_Location :
Braunschweig, Germany
Print_ISBN :
0-7803-3376-4
DOI :
10.1109/CPEM.1996.547049
