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Displaying records 21 to 30 of 42 records.
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21. Flat frequency response in the electronic measurement of the Boltzmann constant
Topic: Quantum Electrical Measurements
Published: 7/1/2012
Authors: Jifeng Qu, Samuel Paul Benz, Yang Fu, Jianqiang Zhang, Horst Rogalla, Alessio Pollarolo
Abstract: A new quantum voltage calibrated Johnson noise thermometer (JNT) was developed at NIM to demonstrate the electrical approach that determines the Boltzmann constant k by comparing electrical and thermal noise power. A measurement with integration peri ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910580

22. Improvements in the NIST Johnson Noise Thermometry System
Topic: Quantum Electrical Measurements
Published: 6/9/2008
Authors: Samuel Paul Benz, Horst Rogalla, Rod White, Jifeng Qu, Paul David Dresselhaus, Wes L Tew, Sae Woo Nam
Abstract: We have developed a Johnson noise thermometry system that is calibrated by precision waveforms synthesized with a quantum-accurate voltage noise source (QVNS). Significant improvements to the QVNS and the cross-correlation measurement electronics hav ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32883

23. Investigations on the measurement of the leakage resistance to ground of a NIST Programmable Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 8/24/2014
Authors: Stephane Solve, Regis Chayramy, Alain Rufenacht, Charles J Burroughs, Samuel Paul Benz
Abstract: The Programmable Josephson Voltage Standard (PJVS) leakage resistance to ground (LRG) is defined as the electrical resistance of one side of the measurement leads to ground. Under certain measurement conditions, this resistance can produce a sign ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915386

24. Johnson Noise Thermometry Measurement of the Boltzmann Constant with a 200 Ohm Sense Resistor
Topic: Quantum Electrical Measurements
Published: 7/1/2012
Authors: Alessio Pollarolo, Tae H. Jeong, Samuel Paul Benz, Horst Rogalla
Abstract: In 2010 NIST measured the Boltzmann constant k by use of an electronic technique that measured the Johnson noise of a 100 Ohm resistor at the triple point of water (TPW). The NIST Johnson noise thermometry (JNT) system used as a reference a voltage ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910628

25. Johnson Noise Thermometry Measurement of the Boltzmann Constant with a 200 Ohm Sense Resistor
Topic: Quantum Electrical Measurements
Published: 6/1/2013
Authors: Alessio Pollarolo, Tae H. Jeong, Samuel Paul Benz, Horst Rogalla
Abstract: In 2010, NIST measured the Boltzmann constant k with an electronic technique that measured the Johnson noise of a 100 Ω resistor at the triple point of water (TPW) and used a voltage waveform synthesized with a quantized voltage noise source (QV ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911711

26. Johnson-noise thermometry based on a quantized-voltage noise source at NIST
Topic: Quantum Electrical Measurements
Published: 9/11/2013
Authors: Alessio Pollarolo, Tae H. Jeong, Samuel Paul Benz, Paul David Dresselhaus, Horst Rogalla, Weston Leo Tew
Abstract: Johnson Noise Thermometry is an electronic approach to measuring temperature. For several years, NIST has been developing a switching-correlator-type Johnson-noise thermometer that uses a quantized voltage noise source as an accurate voltage referenc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910730

27. Measurement of the Boltzmann Constant with Noise Thermometry at NIM
Topic: Quantum Electrical Measurements
Published: 8/24/2014
Authors: Jifeng Qu, Kunli Zhou, Horst Rogalla, Samuel Paul Benz, Yunfeng Fu
Abstract: Since 2010 we have been developing a quantum-voltage-calibrated Johnson noise thermometer at NIM to measure the Boltzmann constant k. With recent improvements in grounding and shielding of the electronics, and matching of the noise sources and t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915384

28. Method for Ensuring Accurate AC Waveforms with Programmable Josephson Voltage Standards
Topic: Quantum Electrical Measurements
Published: 6/1/2013
Authors: Charles J Burroughs, Alain Rufenacht, Samuel Paul Benz, Paul David Dresselhaus
Abstract: The amplitudes of stepwise-approximated sine waves generated by programmable Josephson voltage standards (PJVS) are not intrinsically accurate because the transitions between the quantized voltages depend on numerous conditions. We have developed a m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911695

29. Method for Ensuring Accurate AC Waveforms with Programmable Josephson Voltage Standards
Topic: Quantum Electrical Measurements
Published: 7/1/2012
Authors: Charles J Burroughs, Alain Rufenacht, Samuel Paul Benz, Paul David Dresselhaus
Abstract: The amplitudes of stepwise-approximated sine waves produced by programmable Josephson voltage standards (PJVSs) are not intrinsically accurate because the transitions between the quantized voltages depend on numerous conditions. We have developed a m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910626

30. NIST 10 V Programmable Josephson Voltage Standard System Using a Low Capacity Cryocooler
Topic: Quantum Electrical Measurements
Published: 11/6/2014
Authors: Logan A. Howe, Anna E Fox, Alain Rufenacht, Charles J Burroughs, Paul David Dresselhaus, Samuel Paul Benz, Robert E Schwall
Abstract: Rising costs of and difficulty in obtaining liquid helium in many areas of the world provides strong motivation for cryogen-free operation of superconducting devices such as NIST Programmable Josephson Voltage Standard (PJVS) systems. However, op ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916468



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