In this article, programmable Josephson voltage standard system established in TÜBİTAK UME is presented. The specifications of the instruments used in the system are defined and tested according to the needs of the system. Test setups are given in detail. The cryoprop used to immerse the superconducting integrated circuit into the liquid helium is manufactured. The horn antennas used in the waveguide part of the cryoprop are manufactured by employing wire erosion technique. The optical transceivers having low jitter for distributing trigger and clocks while keeping fully floating the system are manufactured. The software for generating quantum voltages and easy use of the system is prepared and equations used in the algorithm are given. The procedures to maintain the necessary accuracy of the bias electronics to maintain the quantum accuracy of the system is given in detail. The established system is used in metrological measurements and the results of the measurements which prove the quantum state of the system are presented.
A method for traceability to SI for ac voltage and current based on high performance digitizers is presented. In contrast to the existing thermal-based methods, the proposed method utilizes direct traceability to quantum-based waveforms via the use of Josephson voltage systems. This allows not only a simplification of the traceability chain and reduced measurement times but also offers the potential for analysis of the ac voltage and current waveform spectral content, a feature which is not possible using thermal methods. Scaling of current and voltage is achieved by the use of current shunts and resistive voltage dividers respectively. Target operating ranges are up to 1 A and 100 V with a frequency range up to 1 kHz for both. The corresponding target uncertainty for this traceability route is 1 μVV-1 and 2 μAA-1 up to frequencies of 1 kHz. The traceability chain is described and various components are characterized to validate their suitability for this task. It is demonstrated that these uncertainty targets can be met under certain conditions. The use of multi-tone calibration waveforms is investigated to further reduce measurement time. An uncertainty analysis method based on simulation using real component performance data is demonstrated.
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