Title :
A 10 a high-precision DC current source with stability better than 0.1 ppm for evaluating high-current meter
Author :
Nong Wang ; Zhengkun Li ; Qing He ; Zhonghua Zhang ; Bing Han ; Yunfeng Lu
Author_Institution :
Harbin Inst. of Technol., Harbin, China
Abstract :
The principle and structure of a 10 A high stable DC current source is described. Factors determining the current stability are analyzed and the crucial components including the voltage reference, sample resistor, error amplifier and regulator are elaborately selected to guarantee the current stability. Reasons for oscillation and frequency compensation methods are discussed. The best measurement results show that the relative drift and the relative standard deviation of the current in one hour are about 5.9×10-8 and 9.3×10-8 respectively, and the same characteristics in 10 minutes are about 8.2×10-9 and 4.9×10-8 respectively.
Keywords :
amplifiers; compensation; constant current sources; electric current measurement; measurement standards; oscillations; resistors; DC current source; current 10 A; current stability determination; error amplifier; frequency compensation method; oscillation; regulator; relative drift; relative standard deviation; sample resistor; voltage reference; Circuit stability; Oscillators; Regulators; Resistors; Stability criteria; Temperature measurement; Current source; current supply; high-current meter; standard current; voltage reference;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM 2014), 2014 Conference on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4799-5205-2
DOI :
10.1109/CPEM.2014.6898352
