Title :
A current comparator bridge for the direct measurement of 51.6 kΩ against the quantised Hall resistance
Author :
Fletcher, N. ; Goebel, R.
Author_Institution :
Bur. Int. des Poids et Mesures, Sévres, France
Abstract :
This paper presents a simple resistance bridge dedicated to measuring a pair of 51.6 kΩ resistors (which form part of a quadrature bridge) directly against a quantum Hall effect (QHE) reference. It uses a room temperature current comparator of ratio 4, operating with low frequency AC in the range 1 to 10 Hz, and is energized from a single supply in place of the traditional double current source. The design will achieve an overall relative uncertainty of the order a few parts in 109.
Keywords :
comparators (circuits); electric resistance measurement; quantum Hall effect; resistors; current comparator bridge; direct resistance measurement; double current source; frequency 1 Hz to 10 Hz; low frequency AC; quantised Hall resistance; quantum Hall effect reference; relative uncertainty; resistance 51.6 kohm; resistors; room temperature current comparator; temperature 293 K to 298 K; Bridge circuits; Circuit noise; Current measurement; Detectors; Electrical resistance measurement; Electromagnetic measurements; Frequency; Operational amplifiers; Resistors; Voltage;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2010 Conference on
Conference_Location :
Daejeon
Print_ISBN :
978-1-4244-6795-2
DOI :
10.1109/CPEM.2010.5544802
