3 papers
physics.ins-det2018
Inter-laboratory nanoamp current comparison with sub-part-per-million uncertainty
Stephen Giblin, Dietmar Drung, Martin Goetz +1
An ultrastable low-noise current amplifier (ULCA) has been transferred between two laboratories, NPL and PTB, four times, with three of the transfers yielding a relative change in…
physics.ins-det2018
Electrometer calibration with sub-part-per-million uncertainty
Hansjörg Scherer, Dietmar Drung, Christian Krause +2
We performed calibrations of four different commercial picoammeters using the Ultrastable Low-noise Current Amplifier (ULCA) as a calibrator current source operated in the range be…
physics.ins-det2016
Improved Calibration of Instruments for Small Direct Currents
Hansjörg Scherer, Dietmar Drung, Christian Krause
We report on new calibration methods for picoammeters and low-current sources. The "Ultrastable Low-noise Current Amplifier" (ULCA) was used for the exemplary calibration of commer…