Title :
A 250 mA high-precision DC current source with improved stability for the Joule Balance at NIM
Author :
Nong Wang ; Zhonghua Zhang ; Bing Han ; Zhengkun Li ; Yunfeng Lu
Author_Institution :
Harbin Inst. of Technol., Harbin, China
Abstract :
In this paper, the reasons for the unsatisfactory stability of the DC current source early used for the Joule Balance at NIM are discussed. The structure and principle of the compensation circuit to improve the current stability are presented. A 250 mA DC current source with stability about 0.25 ppm in 30 minutes and more than 100 W output power is realized and tested. Measurement results show that the compensation circuit is effective and the current stability is improved more than one order of magnitude than the source early used.
Keywords :
balances; circuit stability; compensation; constant current sources; Joule balance; NIM; National Institute of Metrology; compensation circuit; current 250 mA; high-precision DC current source; improved current stability; Circuit stability; Coils; Current measurement; Resistance; Resistors; Stability criteria; Current measurement; Joule Balance; Plank constant; precision current source; standard current;
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.2014.6898550
