Title :
A 300000-A high precision DC comparator for on-line calibration and measurement
Author_Institution :
Dept. of Electr. Eng., Huazhong Univ. of Sci. & Technol., Wuhan, China
Abstract :
A 300000-A magnetic modulation comparator for heavy direct current which can be used in industrial large-DC systems for online calibration and measurement is described. The comparator features 12 channels, a self-balancing range of 100%, a current ratio accuracy of less than 5*10/sup -5/, a repeatability error of openable-core structure of 3*10/sup -3/, and a resolution and linearity error of 10 p.p.m.<>
Keywords :
calibration; comparators (circuits); computerised instrumentation; electric current measurement; measurement errors; 300000 A; DC comparator; DC industrial system; linearity error; magnetic modulation comparator; online calibration; openable-core structure; repeatability error; self-balancing; Calibration; Current measurement; Electronic circuits; Electrostatic measurements; Linearity; Magnetic cores; Magnetic modulators; Magnetic shielding; Resistors; Switches;
Conference_Titel :
Precision Electromagnetic Measurements, 1990. CPEM '90 Digest., Conference on
Conference_Location :
Ottawa, Ontario, Canada
DOI :
10.1109/CPEM.1990.110044
