The European ACQHE project: modular system for the calibration of capacitance standards based on the quantum Hall effect

Melcher, J.; Schurr, J.; Pierz, K.; Williams, Jonathan M. J.; Giblin, S. P.; Cabiati, F.; Callegaro, Luca; Marullo, G.; Cassiago, Cristina; Jeckelmann, B.; Jeanneret, B.; Overney, F.; Bohacek, J.; Řı́ha, Jan; Power, Oliver; Murray, James E.; Nunes, M.; Lobo, Michele A.; Godinho, Isabel

doi:10.1109/cpem.2002.1034816

Cited by 8 publications

(5 citation statements)

References 8 publications

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“…These advances resulted in bridges capable of measuring impedance ratios with a relative accuracy of the order of 10 -9 . Such bridges are usually employed in the calibration chains linking primary standards of impedance such as the Thomson-Lampard capacitor or the AC Quantum Hall resistance to artefact capacitance standards [7]. The spectacular performance of transformer-based bridges comes at a cost.…”

Section: Impedance Bridgesmentioning

confidence: 99%

Practical Precision Electrical Impedance Measurement for the 21^st Century – EMPIR Project 17RPT04 VersICal

Power

Ziółek

Christensen

et al. 2019

19th International Congress of Metrology (CIM2019)

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The core objective of EMPIR project 17RPT04 VersICaL is to improve the European measurement infrastructure for electrical impedance, with particular emphasis on the capabilities of developing NMIs and calibration centres. The project will seek to exploit the results of existing research on digital impedance bridges (DIBs) by designing, constructing and validating simple, affordable versions suitable to realise the impedance scale in the range 1 nF to 10 μF and 1 mH to 10 H with relative uncertainties in the range 10-5 to 10-6. The first results of the research project, including the bridge designs and details of a polyphase digitally synthesized multichannel source capable of providing voltage outputs of precise ratio and phase are presented.

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Section: Impedance Bridgesmentioning

confidence: 99%

Practical Precision Electrical Impedance Measurement for the 21^st Century – EMPIR Project 17RPT04 VersICal

Power

Ziółek

Christensen

et al. 2019

19th International Congress of Metrology (CIM2019)

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“…( 1) Relative combined standard uncertainty reported in the BIPM calibration certificate for CN (a 10 pF capacitor). (2) Uncertainty contribution associated with the correction for the cable errors. (3) Combined standard uncertainty associated with CX without taking into account the uncertainty contributions associated with RK-90 and the reference standard biannual drift.…”

Section: Quantitymentioning

confidence: 99%

“…In fact only three bridges are necessary as a 1:1 ratio bridge is easily changed to a 10:1 ratio bridge by a cable rearrangement. All these bridges can use the same isolation transformer and main IVD [1]- [3].…”

Section: Introductionmentioning

confidence: 99%

A Two-Stage, Guarded Inductive Voltage Divider with Small Ratio Errors for Coaxial Bridge Applications

2012

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The traceability chain to derive the capacitance unit from the quantum Hall resistance comprises some coaxial bridges. These bridges employ a main two-stage inductive voltage divider to provide the voltage ratio needed. One such divider has been recently constructed and calibrated at Inmetro. The design techniques responsible for the small ratio errors of the device and the calibration method employed are both detailed. The new divider was installed in Inmetro's two terminal-pair coaxial capacitance bridge with significant improvements in the bridge resolution and accuracy.

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“…In voltage ratio bridges, a typical solution is the use of combining networks [2, Ch. 5.6], realized with variable electromagnetic devices, possibly remotely controlled [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Self-Compensating Networks for Four-Terminal-Pair Impedance Definition in Current Comparator Bridges

Callegaro

D'Elia

Pourdanesh

et al. 2016

IEEE Trans. Instrum. Meas.

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The four terminal-pair (4TP) definition of impedance standards allows to reach ultimate accuracy in impedance metrology. In general, the 4TP definition requires dedicated circuitry to be included in the bridge network and the attainment of auxiliary bridge balances during the measurement. A careful choice of the network topology allows the bridge to be self-compensating: the 4TP definition is in large part achieved by the behaviour of the network itself, without any adjustment. The additional circuitry required for impedance definition can therefore be simpler, the balancing procedure becomes easier, and a more robust 4TP can be achieved. This paper analyses a current comparator bridge network with a topology featuring self-compensation. A digitally-assisted test bridge has been implemented; test measurements on ac resistance comparison in the 25 Ω to 100 Ω range, at kHz frequency, are reported.

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The European ACQHE project: modular system for the calibration of capacitance standards based on the quantum Hall effect

Cited by 8 publications

References 8 publications

Practical Precision Electrical Impedance Measurement for the 21^st Century – EMPIR Project 17RPT04 VersICal

Practical Precision Electrical Impedance Measurement for the 21^st Century – EMPIR Project 17RPT04 VersICal

A Two-Stage, Guarded Inductive Voltage Divider with Small Ratio Errors for Coaxial Bridge Applications

Self-Compensating Networks for Four-Terminal-Pair Impedance Definition in Current Comparator Bridges

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The European ACQHE project: modular system for the calibration of capacitance standards based on the quantum Hall effect

Cited by 8 publications

References 8 publications

Practical Precision Electrical Impedance Measurement for the 21st Century – EMPIR Project 17RPT04 VersICal

Practical Precision Electrical Impedance Measurement for the 21st Century – EMPIR Project 17RPT04 VersICal

A Two-Stage, Guarded Inductive Voltage Divider with Small Ratio Errors for Coaxial Bridge Applications

Self-Compensating Networks for Four-Terminal-Pair Impedance Definition in Current Comparator Bridges

Contact Info

Product

Resources

About

Practical Precision Electrical Impedance Measurement for the 21^st Century – EMPIR Project 17RPT04 VersICal

Practical Precision Electrical Impedance Measurement for the 21^st Century – EMPIR Project 17RPT04 VersICal