Title :
Intrinsically stable CCC for accurate measurement of small currents
Author :
Rietveld, Gert ; de la Court, P. ; Van den Brom, Helko E.
Author_Institution :
NMi Van Swinden Lab., Delft
Abstract :
We have developed and tested an intrinsically stable cryogenic current comparator (CCC) with a 1:20000 winding ratio for the accurate measurement of small electrical currents. Key feature of the CCC is the use of resistive CuNi wire and brass internal shields. First measurements of lOOpA to 300 pA currents using this CCC are performed at an uncertainty level of around 20 ppm to 50 ppm.
Keywords :
cryogenics; current comparators; electric current measurement; brass internal shields; intrinsically stable cryogenic current comparator; resistive wire; small electrical current measurement; uncertainty level; winding ratio; Conductivity; Copper; Cryogenics; Current measurement; Damping; Electric variables measurement; Resonance; Resonant frequency; SQUIDs; Testing;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2008. CPEM 2008. Conference on
Conference_Location :
Broomfield, CO
Print_ISBN :
978-1-4244-2399-6
Electronic_ISBN :
978-1-4244-2400-9
DOI :
10.1109/CPEM.2008.4574700
