89 citations · 223 across the 8 of their papers we have counts for
9 papers
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…
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…
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…
Validation of the ultrastable low-noise current amplifier as travelling standard for small direct currents
Dietmar Drung, Christian Krause, Stephen P. Giblin +7
An interlaboratory comparison of small-current generation and measurement capability is presented with the ultrastable low-noise current amplifier (ULCA) acting as travelling stand…
Validation of a quantized-current source with 0.2 ppm uncertainty
Friederike Stein, Dietmar Drung, Lukas Fricke +11
We report on high-accuracy measurements of quantized current, sourced by a tunable-barrier single-electron pump at frequencies up to GHz. The measurements were performed wi…
Ultrastable low-noise current amplifier
Dietmar Drung, Christian Krause, Ulrich Becker +2
An ultrastable low-noise current amplifier (ULCA) is presented. The ULCA is a non-cryogenic instrument based on specially designed operational amplifiers and resistor networks. It…
Traceable precision pA direct current measurements with the ULCA
Hansjörg Scherer, Gerd-Dietmar Willenberg, Dietmar Drung +2
A standard method for picoammeter calibrations is the capacitor charging technique, which allows generating traceable currents in the sub-nA range. However, its accuracy is limited…
Traceable precision generation and measurement of pA direct currents
Hansjörg Scherer, Gerd-Dietmar Willenberg, Dietmar Drung +2
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 accura…
Quantum Metrology Triangle Experiments: A Status Review
Hansjörg Scherer, Benedetta Camarota
Quantum Metrology Triangle experiments combine three quantum electrical effects (the Josephson effect, the quantum Hall effect and the single-electron transport effect) used in met…