New generation of AC-DC Current Transfer Standards at Inmetro

Souza, R. M.; Afonso, Renato; Klonz, M.; Landim, Regis Pinheiro

doi:10.21014/acta_imeko.v1i1.24

Cited by 8 publications

(2 citation statements)

References 13 publications

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“…In the future, programmable and pulse-driven Josephson voltage standards will fully replace conventional "only-dc" JVS as well as ac voltage calibration techniques based on classical effects [41] and, therefore, not directly linked to the brand new quantum SI units. To meet this goal, several aspects have still to be optimized, in order to extend both voltage and frequency ranges of the two time-dependent Josephson standards, to simplify their operation and to improve calibration accuracy in the specific ranges and applications where conventional methods still dominate.…”

Section: Discussionmentioning

confidence: 99%

Recent advancements and perspectives of INRiM’s time-dependent Josephson voltage standards

Durandetto,

Serazio,

Sosso

2023

Acta IMEKO

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Quantum voltage standards based on ac Josephson effect have been used in metrology since a few years after the discovery of the physical phenomenon. The role of quantum standards is now crucial following the SI redefinition in 2019: electrical units are today defined in terms of the fundamental constants e (elementary charge) and h (Planck’s constant). The extremely low uncertainty in dc measurements, that can be lower than 1 nV/V at 10 V, is stimulating research to extend application to ac and signals arbitrarily changing with time. Approaching the dc accuracy is challenging, however. The two main technologies used for the generation of non-steady voltage signals are programmable and pulsed Josephson junction arrays. In this work we discuss the main advancements obtained at the Italian Istituto Nazionale di Ricerca Metrologica (INRiM) with both technologies, and the most recent developments taking advantage of He-free device cooling techniques.

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Section: Discussionmentioning

confidence: 99%

Recent advancements and perspectives of INRiM’s time-dependent Josephson voltage standards

Durandetto,

Serazio,

Sosso

2023

Acta IMEKO

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“…In addition, the use of many thermocouples distributed along the entire length of the bifilar heater reduces the detrimental impact of thermoelectric reversible phenomena, so that the PMJTC DC reversal error is significantly reduced, reaching values of 1 μV/V. Planar technology enables the construction of a heater with resistance in the range from several dozen ohms to about 1 kΩ, which allows us to bring to the PMJTC input a voltage with an effective value in the range from a fraction of a volt to several volts [42]. For this reason, primary standards using PMJTC generally do not require the use of range resistors for voltages in the range from 0.5 to approximately 5 V.…”

Section: Planar Multi-junction Thermal Voltage Convertersmentioning

confidence: 99%

Wideband AC Voltage Standards

Kubiczek,

Kampik,

Grzenik

et al. 2024

PAR

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This article presents a critical review and comparison of constructions and metrological properties of contemporary wideband standards for AC voltage. It focuses on selected thermal voltage converters (TVCs) used in alternating current-direct current (AC-DC) transfer voltage standards and for the most precise measurements of AC voltages up to approximately 100 MHz. These devices serve as primary AC voltage standards at National Measurement Institutes (NMIs).

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Investigating DC Characteristics in Testing Precision Current Shunts for Steady State

Isaiev,

Isaieva

2023

MAPAN

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New generation of AC-DC Current Transfer Standards at Inmetro

Cited by 8 publications

References 13 publications

Recent advancements and perspectives of INRiM’s time-dependent Josephson voltage standards

Recent advancements and perspectives of INRiM’s time-dependent Josephson voltage standards

Wideband AC Voltage Standards

Investigating DC Characteristics in Testing Precision Current Shunts for Steady State

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