Title :
Thin-film cryogenic current comparator
Author :
Seppä, Heikki ; Satrapinski, A. ; Kiviranta, Mikko ; Virkki, Vesa
Author_Institution :
VTT Autom., Meas. Technol., Espoo, Finland
fDate :
4/1/1999 12:00:00 AM
Abstract :
We analyze a thin-film cryogenic current comparator (CCC) intended to be used in ac measurements. Our analysis shows that by calibrating the dc ratio error of the thin-film CCC against a conventional CCC, it can be used up to 10 kHz as a sensitive and highly accurate current comparator. We have fabricated a practical 1:1 planar CCC integrated with a low-noise SQUID magnetometer. The preliminary experiments obtained from the 1:1 comparator are described
Keywords :
SQUID magnetometers; bridge circuits; current comparators; electric resistance measurement; measurement standards; quantum Hall effect; thin film circuits; 10 kHz; AC measurements; AC resistance bridge; DC ratio error; current resolution; highly accurate current comparator; low-noise SQUID magnetometer integrated; quantised Hall resistance; resistance measurement; sensitivity; thin-film cryogenic current comparator; Calibration; Cryogenics; Electric resistance; Electrical resistance measurement; Frequency; Inductance; Metrology; Strips; Superconducting coils; Transistors;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
