Accurate Low-Current Measurement Circuit for Multimeters and Oscillograps

Shuqin Geng (Beijing University of Technology)
Chen Liu (Beijing University of Technology)
Jinhui Wang (Beijing University of Technology)
Ligang Hou (Beijing University of Technology)
Ying Yuan (Beijing University of Technology)

Indonesian Journal of Electrical Engineering and Computer Science
Vol 12, No 5: May 2014

A simple and high-precision current-to-voltage (I/V) converter circuit for multimeters and oscillographs is presented in this paper. The I/V converter measures the electric current with  uA and nA selectable ranges in the frequency range from direct current to 1 MHz. Circuit technology is also discussed. System Architecture is presented and dual polarity power is designed. Power detector circuit is explained.  Measurement data are obtained. Linearity and the error are analyzed. The typical accuracy of the μCurrent is higher by 0.085% in the μA and nA ranges. μCurrent can be used in detecting low uA and nA in current systems, chips, and modules. DOI : http://dx.doi.org/10.11591/telkomnika.v12i5.5004