High precision automated measuring system for AC-DC current transfer standards

Rydler, Karl-Erik

doi:10.1109/19.278637

Cited by 32 publications

(9 citation statements)

References 4 publications

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“…The other strategy is to change the polarity of the high-CM wattmeter channel and connect the guard of that channel to "high", as described in [5]. Both channels will then act as they were connected to low potential and the leakage current (from each "Hi input" to guard) will be incorporated in the shunt transfer function.…”

Section: Shunt Modelmentioning

confidence: 99%

Improved Model and Phase-Angle Verification of Current Shunts for AC And Power Measurements

Svensson¹,

Rydler²,

Tarasso³

2004

2004 Conference on Precision Electromagnetic Measurements

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The phase angle error of the output voltage of resistive shunts may depend on a number of stray impedance components. These components have been estimated for some shunt designs. Their total contribution has been measured by a LCR meter method and compared to a step-up procedure. The agreement between the different methods, for measurement of phase angle difference of two shunts, was within a few prad at 1500 Hz.

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Section: Shunt Modelmentioning

confidence: 99%

Improved Model and Phase-Angle Verification of Current Shunts for AC And Power Measurements

Svensson¹,

Rydler²,

Tarasso³

2004

2004 Conference on Precision Electromagnetic Measurements

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“…SP has developed a method for accurate calibration of current ac-dc transfer difference of TCCs based on guarding of the non-grounded TCC [3]. This method has been used to investigate the common mode sensitivity of a thermal transfer standard with amplified mV-ranges (TTS), and a measurement set-up is described for the comparison of a TTS and JAWS on ac-voltage.…”

Section: Introductionmentioning

confidence: 99%

A Method for the Dissemination of the AC-Voltage of a Josephson Arbitrary Waveform Synthesizer

Rydler¹,

Tarasso²,

Lapuh

et al. 2004

2004 Conference on Precision Electromagnetic Measurements

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“…The housings of the two standards are at low and high potential [5]. As there are small differences at high frequencies depending on the potential of the "standard" and the "unknown", all measurements are repeated with the potentials interchanged, and the results are averaged [14]. An uncertainty component has to be added to the uncertainty budget due to this potential averaging.…”

Section: Calibration Set-upmentioning

confidence: 99%

“…The design of the measuring systems for comparison of thermal current converters basically did not change during the last 50 years [5,6,7,8,14,15]. However, automatic calibration systems have been developed to replace the manually operated systems for the last 20 years 1141.…”

Section: Introductionmentioning

confidence: 99%

AC-DC current transfer step-up calibration and uncertainty calculation

Klonz

Laiz²,

Spiegel³

et al.

IMTC 2001. Proceedings of the 18th IEEE Instrumentation and Measurement Technology Conference. Rediscovering Measurement in The

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New ac-dc current transfer standards are built for the current range from 0.3 mA to 20 A and the frequency range from 10 Hz to 100 kHz. A 3-dimensional PTB-Multijunction Thermal Converter (MJTC) with a heater resistance of 27 R is the basic standard for the acdc current transfer at currents from 20 mA to 50 mA. At lower currents, planar MJTCs (PMJTCs) with heater resistances from 90 ! 2 to 960 R are used in a step-down procedure. Coaxial current shunts in parallel with PMJTCs extend the current range up to 20 A. The standard measurement uncertainties are in the range from 0.2 yA/A at 25 mA and 1 kHz to 50 pA/A at 20 A and 100 kHz. The high sensitivity of the PMJTC allows bigger steps in the step-up calibration and some smaller steps between these steps. Calibration of all these steps leads to an overdetermined system to check for the validity of the assumptions made in the step-up procedure. This results in reduced uncertainties at the different current levels compared to the old method.

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High precision automated measuring system for AC-DC current transfer standards

Cited by 32 publications

References 4 publications

Improved Model and Phase-Angle Verification of Current Shunts for AC And Power Measurements

Improved Model and Phase-Angle Verification of Current Shunts for AC And Power Measurements

A Method for the Dissemination of the AC-Voltage of a Josephson Arbitrary Waveform Synthesizer

AC-DC current transfer step-up calibration and uncertainty calculation

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