Traceable precision generation and measurement of pA direct currents
arXiv:1406.4662 · doi:10.1109/CPEM.2014.6898503
Abstract
We present the comparison of results from the generation and the measurement of direct currents in the pA range, performed with traceable state-of-the-art methods at highest accuracy. The currents were generated with the capacitor charging method, and measured with the first prototype of a novel picoammeter developed at PTB. The results confirm the agreement between both methods and the linearity of the new picoammeter at an uncertainty level of few microA/A. Also, they shed light on the ac-dc difference of capacitors, crucial for current generation with the capacitor charging method.
2 pages, 1 figure. Contribution (summary paper, to appear in IEEE CPEM 2014 Conference Digest) accepted for presentation on the Conference on Precision Electromagnetic Measurements (CPEM) 2014 in Rio de Janeiro (Brazil), 24-29 August 2014