Title :
A high precision calibration setup for low-current meters in the range of 10 pA to 1 fA
Author :
Kim, Wan-Seop ; Kim, Mun-Seog ; Kim, Kyu-Tae ; Chong, Yonuk ; Kim, Han-Jun ; Kim, Myungsoo ; Tauscher, H. Norbert
Author_Institution :
Korea Res. Inst. of Stand. & Sci., Daejeon, South Korea
Abstract :
A low DC current source based on the method of charging a capacitor using a linear voltage ramp was built for the calibration of picoammeters and the metrological features of the setup were tested. The measurement uncertainty was improved by offset current compensation and a galvanic isolation between the personal computer and the ramp generator via opto-coupling. Using this setup, a low-current meter was calibrated in the range from 10 pA to 1 fA with an uncertainty of 3times10-5 to 6times10-2.
Keywords :
ammeters; calibration; electric current measurement; measurement uncertainty; ramp generators; DC current source; capacitor charging; galvanic isolation; linear voltage ramp; measurement uncertainty; offset current compensation; optocoupling; picoammeters calibration; ramp generator; Calibration; Capacitance; Capacitors; Current measurement; Galvanizing; Measurement uncertainty; Microcomputers; Solids; Testing; Voltage;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2008. CPEM 2008. Conference on
Conference_Location :
Broomfield, CO
Print_ISBN :
978-1-4244-2399-6
Electronic_ISBN :
978-1-4244-2400-9
DOI :
10.1109/CPEM.2008.4574801
