Title :
Measurement of resistance ratios in the range to 100 megohms
Author_Institution :
Meas. Int. Ltd., Prescott, Ont., Canada
Abstract :
The results of using a technique of potentiometrically comparing the voltage drops across two resistors in series utilizing an automatic potentiometer are presented. It is shown that a source voltage of 10 V is adequate to make 1:1 ratio resistance measurements from 10/sup 3/ Omega to 10/sup 8/ Omega to within +or-0.5*10/sup -6/. The same source voltage of 10 V can be used to make 10:1 ratio measurements from 10/sup 3//10/sup 2/ Omega to 10/sup 8//10/sup 7/ Omega to within +or-1*10/sup -6/. The source voltage of 10 V can also be used to make 100:1 ratio measurements from 10/sup 5//10/sup 3/ Omega to 10/sup 8//10/sup 6/ Omega to within +or-6*10/sup -6/. Ratios of 1:10 can also be measured. but in general the anticipated uncertainty is some 2-5 times greater than when a 10:1 ratio is measured.<>
Keywords :
electric resistance measurement; measurement standards; potentiometers; 1*10/sup 3/ to 1*10/sup 8/ ohm; 10 V; automatic potentiometer; resistance measurements; resistance ratios; voltage drops; Bridge circuits; Calibration; Detectors; Electrical resistance measurement; Kelvin; Marketing and sales; Resistors; Strontium; Uncertainty; Voltage;
Conference_Titel :
Precision Electromagnetic Measurements, 1990. CPEM '90 Digest., Conference on
Conference_Location :
Ottawa, Ontario, Canada
DOI :
10.1109/CPEM.1990.110031
