The following publications offer detailed information about our CCC system performance and different system components:

Improving the stability of cryogenic current comparator setups 
D Drung, M Götz, E Pesel, J-H Storm, C Aßmann, M Peters and Th Schurig
Supercond. Sci. Technol. 22 (2009) 114004 
stacks.iop.org/SUST/22/114004

Improved Cryogenic Current Comparator Setup With Digital Current Sources
Gotz, M.; Drung, D. ; Pesel, E. ; Barthelmess, H.-J. ; Hinnrichs, C. ; Assmann, C. ; Peters, M. ; Scherer, H. ; Schumacher, B. ; Schurig, T.
Instrumentation and Measurement, IEEE Transactions on (Volume: 58, Issue: 4, 2009)
doi: 10.1109/TIM.2008.2012379

Ultra-low Noise Chopper Amplifier with Low Input Charge Injection
Dietmar Drung and Jan-Hendrik Storm
Instrumentation and Measurement, IEEE Transactions on (Volume: 60, Issue: 7, pp: 2347-2352), 2011
doi: 10.1109/TIM.2011.2114030

Settling Behavior of the Bridge Voltage in Resistance Ratio Measurements With Cryogenic Current Comparators
M. Gotz, D. Drung, E. Pesel and F. Ahlers
Instrumentation and Measurement, IEEE Transactions on (Volume: 60, Issue: 7, pp: 2660-2666), 2011
doi: 10.1109/TIM.2010.2100690

Aspects of Application and Calibration of a Binary Compensation Unit for Cryogenic Current Comparator Setups
Drung, D.; Gotz, M.; Pesel, E.; Barthelmess, H.J.; Hinnrichs, C.
Instrumentation and Measurement, IEEE Transactions on (Volume: 62,  Issue: 10), Oct. 2013
10.1109/TIM.2013.2259112

Comparison of Quantum Hall Effect resistance standards of the PTB and the BIPM
Pierre Gournay, Benjamin Rolland, M.Götz and E.Pesel 
Final report, 2014-07
https://www.bipm.org/utils/common/pdf/final_reports/EM/BIPM.EM-K12/BIPM.EM-K12_PTB_2013.pdf

On-site comparison of Quantum Hall Effect resistance standards of the CMI and the BIPM
Pierre Gournay, Benjamin Rolland, Jan Kucera and Lucie Vojácková 
Final report, 2017-10
https://www.bipm.org/utils/common/pdf/final_reports/EM/BIPM.EM-K12/BIPM.EM-K12_CMI_2017.pdf

On-site comparison of Quantum Hall Effect resistance standards of the KRISS and the BIPM
Pierre Gournay, Benjamin Rolland, Dong-Hun Chae, and Wan-Seop Kim
Final report, 2020-05
https://www.bipm.org/utils/common/pdf/final_reports/EM/BIPM.EM-K12/BIPM.EM-K12_KRISS_2019.pdf