Fabrication of a standard two-stage autotransformer at LNE

Sindjui, Ralph; Gournay, P.; Thevenot, O.; Thuillier, G.

doi:10.1109/cpem.2014.6898513

Cited by 2 publications

(2 citation statements)

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“…Each voltage injection system has two generators of the EMX-1434 module (in quadrature and in phase). An injection transformer is used to perform the vector sum of the supply voltage vector and the two injection voltages in phase and quadrature [26]. Capacitors C 1 and C 2 are used to reduce the level of the in-phase voltage that is injected by the EMX-1434 modules, which is necessary to ensure the bridge balance (showing a minimum on the detector D 2 ).…”

Section: Description Of the Impedance Bridgementioning

confidence: 99%

Digital Impedance Bridge for Four-Terminal-Pair AC Resistor Calibration up to 20 kHz

Ouameur,

Vasconcellos,

Agazar

2024

Metrology

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For this study, a substitution principle-based impedance bridge has been developed to calibrate AC resistors in a four-terminal-pair (4TP) configuration. The calibration is performed in the full complex plane for resistances ranging from 100 mΩ to 400 Ω and frequencies of between 50 Hz and 20 kHz. The automated bridge is based on four resistors associated with two high-impedance stages. The balancing of the bridge is achieved by means of PXI modules. The bridge is automatically balanced via a simplex top-down algorithm. The new bridge is primarily used for the measurement chain of AC standard resistors defined in a 4TP configuration at LNE, which are used for routine customer calibrations. The traceability of LNE’s standard resistors when defined in a 4TP configuration is ensured by a measurement chain from a 1 kΩ reference resistor using the new bridge. The reference resistor was calibrated previously via comparison with a calculable resistor up to 20 kHz. The bridge was validated via comparison with calibration results obtained in 1983 and 2009. For a resistor of 1 Ω at 1 kHz, the uncertainty of the series resistance variation and the phase shift are less than 6 µΩ/Ω (k = 1) and 6 µrad (k = 1), respectively.

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Section: Description Of the Impedance Bridgementioning

confidence: 99%

Digital Impedance Bridge for Four-Terminal-Pair AC Resistor Calibration up to 20 kHz

Ouameur,

Vasconcellos,

Agazar

2024

Metrology

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“…The transformer primary winding consists of one turn, made of a rigid cable with an interrupted shield, which crosses a magnetic core. The secondary winding consists of 100 turns, wounded around the core according to the 'Ayrton-Perry' method [36]. The coiled core is placed in a brass box which constitutes the shielding.…”

Section: Injection Transformermentioning

confidence: 99%

New impedance bridge at LNE for the two terminal-pair AC resistor calibration up to 20 kHz

Ouameur¹,

Vasconcellos²,

Agazar³

et al. 2022

Metrologia

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This paper presents the evolution of LNE’s impedance bridge (Wheatstone bridge) used to calibrate AC resistors defined in the two terminal-pair (2TP) configuration. A new automated Wheatstone bridge, based on 4 resistances, was developed to operate in the full complex plane for resistances ranging from 400 Ω to 2 MΩ and for frequencies up to 20 kHz. A commercial dual precision arbitrary waveform generator supplies the bridge and PXI modules achieve the balance. A phase and frequency synchronization solutions between the arbitrary waveform generator source and the PXI modules were used. The choice of these instruments allows the bridge to be easily automated and to benefit from recent progress in the development of digital analog converters, in particular those with high frequency sampling rates and resolution. The bridge is mainly dedicated to realize the periodic calibration of LNE’s standard resistors, used for routine customer calibrations. The traceability of LNE’s standard resistors is ensured, firstly, by the calibration of a 1 kΩ resistor by comparison to a calculable resistor up to 20 kHz. Then, this resistor is used as a reference element to ensure the traceability of all LNE’s standard resistors using the new bridge. The validation was done by comparing the results obtained, for some resistors with very low drift, with those obtained during calibrations performed in 1983, 1995 and 2009. For resistors of 1 kΩ in a 1:1 ratio, the expanded uncertainty of series resistance variation and argument are, respectively, less than 1.3 µΩ/Ω (k = 1) and 1.2 µrad (k = 1), up to 20 kHz.

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Fabrication of a standard two-stage autotransformer at LNE

Cited by 2 publications

References 0 publications

Digital Impedance Bridge for Four-Terminal-Pair AC Resistor Calibration up to 20 kHz

Digital Impedance Bridge for Four-Terminal-Pair AC Resistor Calibration up to 20 kHz

New impedance bridge at LNE for the two terminal-pair AC resistor calibration up to 20 kHz

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