A Digitally Assisted Current Comparator Bridge for Impedance Scaling at Audio Frequencies

Trinchera, Bruno; D'Elia, Vincenzo; Callegaro, Luca

doi:10.1109/tim.2013.2238011

Cited by 10 publications

(14 citation statements)

References 22 publications

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“…The deviations are expected to be of the order of 10 −6 or lower [14]. Current ratios can be calibrated with a dedicated experiment [1], [2].…”

Section: Discussionmentioning

confidence: 99%

“…4.6.4.2]. This approach has been applied to a two-arm CC bridge [14] and to a voltage ratio bridge [15], and can also be applied to the bridge topology described in this paper.…”

Section: A Impedance Definitionmentioning

confidence: 99%

“…The implementation of the three-arm CC bridge presented here is derived from that of a two-arm digitally assisted CC bridge [14], which showed good results in the comparison of like impedances.…”

Section: B Bridgementioning

confidence: 99%

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A Three-Arm Current Comparator Bridge for Impedance Comparisons Over the Complex Plane

Callegaro

D'Elia

Ortolano

et al. 2015

IEEE Trans. Instrum. Meas.

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We present here the concept of three-arm current comparator impedance bridge, which allows one to perform comparisons among three unlike impedances. Its purpose is the calibration of impedances having arbitrary phase angles against calibrated nearly pure impedances. An analysis of the bridge optimal setting and proper operation is presented. To test the concept, a two-terminal-pair digitally assisted bridge has been realized; preliminary measurements of an air-core inductor and of an RC network versus decadic resistance and capacitance standards, at kilohertz frequency, have been performed. The bridge measurements are compatible with previous knowledge of the standard values with relative deviations of parts in 10^{-5}

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“…The deviations are expected to be of the order of 10 −6 or lower [14]. Current ratios can be calibrated with a dedicated experiment [1], [2].…”

Section: Discussionmentioning

confidence: 99%

“…4.6.4.2]. This approach has been applied to a two-arm CC bridge [14] and to a voltage ratio bridge [15], and can also be applied to the bridge topology described in this paper.…”

Section: A Impedance Definitionmentioning

confidence: 99%

See 1 more Smart Citation

A Three-Arm Current Comparator Bridge for Impedance Comparisons Over the Complex Plane

Callegaro

D'Elia

Ortolano

et al. 2015

IEEE Trans. Instrum. Meas.

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“…3.3.9]. The current comparator CC, which is described in detail in [17], is provided with a primary ratio winding having 21 The main and auxiliary bridge balances are achieved with an automatic balancing algorithm [6]. The whole measurement procedure takes around 5-10 min.…”

Section: Methodsmentioning

confidence: 99%

An international comparison of phase angle standards between the novel impedance bridges of CMI, INRIM and METAS

et al. 2018

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We report here the results of a comparison of electrical impedance standards aimed at evaluating four novel digital impedance bridges developed by the national metrology institutes CMI, INRIM and METAS. This comparison, which is the first of its kind, involved phase angle impedance standards developed by TÜBİTAK UME with phase angles of ±30 • and ±60 • , and magnitudes ranging from about 100 Ω to 1 MΩ. The comparison demonstrated agreement among the measurement results obtained with the different bridges, and allowed us to gather information on the stability of the phase standards and on the more critical aspects related to the characterization of the bridges.

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“…The current comparator CC, described in detail in [8], is wound on a toroidal amorphous ferromagnetic core. It is provided with a primary ratio winding having 21 taps corresponding to turn numbers n = −100, −90, .…”

Section: Experimental Set-upmentioning

confidence: 99%

A Three-Arm Current Comparator Digitally Assisted Bridge for the Comparison of Arbitrary Four Terminal-Pair Impedances

Ortolano

D'Elia

Callegaro

2017

IEEE Trans. Instrum. Meas.

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High accuracy impedance measurements are performed with coaxial transformer bridges, whose conventional design allow the comparison of like impedances-pure resistors or capacitors. Here we present a current comparator bridge suited for the measurement of impedances of arbitrary magnitudes and phase angles. The bridge has three arms, to connect the impedance under measurement and two calibrated standards. The bridge is digitally assisted and its operation is based on a polyphase digital sine wave synthesizer. To allow the measurement of mid-to low-impedance magnitudes, the bridge network and the balancing procedure are designed to approximate the four terminal-pair definition of the three impedance standards. The bridge has been extensively tested with conventional impedance standards and custom designed phase standards. The relative base accuracy is in the 10 −5-10 −6 range at kHz frequency. Index Terms-Impedance measurement, bridge circuits, electromagnetic devices, precision measurements. This activity has been partially funded by the Progetto Premiale MIUR-INRIM P6-2012, Implementation of the new International System (SI) of Units. The work has been carried out within the European Metrology Research Programme (EMRP) SIB 53, Automated impedance metrology extending the quantum toolbox on electricity. The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union.

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A Digitally Assisted Current Comparator Bridge for Impedance Scaling at Audio Frequencies

Cited by 10 publications

References 22 publications

A Three-Arm Current Comparator Bridge for Impedance Comparisons Over the Complex Plane

A Three-Arm Current Comparator Bridge for Impedance Comparisons Over the Complex Plane

An international comparison of phase angle standards between the novel impedance bridges of CMI, INRIM and METAS

A Three-Arm Current Comparator Digitally Assisted Bridge for the Comparison of Arbitrary Four Terminal-Pair Impedances

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