Title :
Improved technique and standard resistors for the measurement of high value resistances
Author :
Sofranac, Z. ; Graetsch, V.
Author_Institution :
Physikalisch-Tech. Bundesanstalt, Braunschweig, Germany
Abstract :
A description is given of an adapted Wheatstone bridge measurement system based on the balanced-bridge method, which has been automated for the comparison of high-value resistance standards between 10/sup 8/ Omega and 10/sup 14/ Omega . The system has been tested with high-magnitude standard resistors. The relative measurement uncertainty of the system for the comparison of two 5*10/sup 8/- Omega resistors was found to be smaller than 1*10/sup -6/, which is about a factor of five better than values obtained with other systems. This value increases for bridge ratios of 1:10 and 1:100 at higher resistances to about 2*10/sup -5/.<>
Keywords :
bridge instruments; electric resistance measurement; measurement standards; resistors; 1*10/sup 8/ to 9*10/sup 14/ ohm; Wheatstone bridge; automated measurement; balanced-bridge; high-value resistance standards; microcomputer; standard resistors; Bridge circuits; Current measurement; Detectors; Distortion measurement; Electrical resistance measurement; Measurement standards; Q measurement; Resistors; Temperature measurement; Voltage;
Conference_Titel :
Precision Electromagnetic Measurements, 1990. CPEM '90 Digest., Conference on
Conference_Location :
Ottawa, Ontario, Canada
DOI :
10.1109/CPEM.1990.109950
