89 citations · 223 across the 8 of their papers we have counts for
6 papers · 1 filter
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…
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…