Title :
The ratio error of the overlapped-tube cryogenic current comparator
Author_Institution :
Metrol. Res. Inst., Tech. Res. Centre of Finland, Espoo, Finland
fDate :
10/1/1990 12:00:00 AM
Abstract :
Analytic expressions for the ratio uncertainty of the overlapped-tube cryogenic current comparator are derived for dimensioning the overlapped-tube comparator. Theoretical predictions agree reasonably well with experimental observations by H. Ramin (Arch. Elektrotech., vol.58, p.53, 1976). The construction of a very sensitive cryogenic current comparator and the possibility of minimizing the ratio uncertainty by reducing the size of the detection coil are also discussed
Keywords :
SQUIDs; electric current measurement; electric resistance measurement; low-temperature techniques; SQUID magnetometer; dimensioning; electric current measurement; overlapped-tube cryogenic current comparator; ratio error; Cryogenics; Detectors; High temperature superconductors; Magnetic shielding; Resistors; SQUID magnetometers; Superconducting cables; Superconducting coils; Temperature sensors; Uncertainty;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
