Four Terminal Pair Digital Sampling Impedance Bridge up to 1 MHz

Maslan, Stanislav; Šíra, Martin; Skalicka, Tereza

doi:10.1109/cpem.2018.8501171

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…We consider two standard resistors R p1 and R p2 in parallel and R eq the equivalent resistance. Using the equation (10) and the equation for two resistances in parallel, we admit that: (19) where Δs Req , Δs Rp1 and Δs Rp2 are the variations of the series resistance, respectively, of resistors R eq , R p1 and R p2 . The τ Req , τ Rp2 and τ Rp1 are the time constants, respectively, of resistors R eq , R p1 and R p2 .…”

Section: Ac Resistance Standards Measurement Chainmentioning

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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Section: Ac Resistance Standards Measurement Chainmentioning

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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“…Impedance measurements of an RC element in series to a resistor have been demonstrated in the mΩ range and in a frequency range up to 10 kHz using effective voltage and current measurements [10] that are traceable to the SI. That technique however can only be used in conjunction with this specific circuitry, assuming negligible interfering impedances [11]. Some progress is currently made within the EMPIR project 'LiBforSecUse' to develop and establish low impedance standards [3], which fit well into the scope this work.…”

Section: Introductionmentioning

confidence: 99%

“…However, impedance standards (e.g. current shunts or reactance standards) and their characterisation might strive for smaller uncertainties [11].…”

Section: Introductionmentioning

confidence: 99%

Primary measurement method for the characterisation of impedance standard in the mΩ range

Rusanto

Seitz

Funck

et al. 2022

Meas. Sci. Technol.

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Impedance standards having impedance values in the low mΩ range, with non-zero reactances, and operable with AC-currents of a few Amps and up to a few kHz are needed for appropriate impedance meter calibration. These challenging operation parameters are most relevant for electrochemical impedance spectroscopy of high energy Li-ion battery cells. We present a primary measurement method that can be used for the characterisation of respective impedance standards traceable to the SI. Basically, two calibrated high precision DC voltage meters are used to sample the voltages across a characterised reference resistor and the impedance standard under test, while both are excited with the same ac current. The measured voltages are fitted with sin waves and the complex impedance value is calculated from the amplitudes and phase difference of the voltage curves. We present the measurement results of a test impedance in mΩ range, including a full uncertainty budget. Moduli of the measured impedances are compared with those of another method that has been presented recently. The results are equivalent up to 1 kHz and within a relative expanded uncertainty of around 0.47%.

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