- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Progress on a New Measurement of von Klitzing Constant at NIM
摘要： This paper describes the progress on a new measurement of von Klitzing constant (Rk) through an experiment linking the new calculable capacitor and the quantized Hall resistance by means of a quadrature transfer at NIM. The recent improvements of the new calculable capacitor, the optical interferometry, the impedance measurement chain are presented.
关键词： von Klitzing constant,optical interferometry,bridge circuits,Calculable capacitor,impedance measurement,measurement standards
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Construction of Maxwell-Wien Bridge at SASO-NMCC
摘要： An inductance calibration system for standard inductors based on a Maxwell-Wien bridge has been constructed at Saudi Standards Metrology and Quality Organization, National Measurement and Calibration Center (SASO NMCC). Expanded measurement uncertainty has been estimated to be less than 20 μH/H for 100 mH inductance at 1 kHz. A bilateral comparison between SASO NMCC and TüB?TAK UME has been performed in order to evaluate the performance of the calibration system.
关键词： inductance measurement,Inductance measurement,inductance comparison,Maxwell-Wien bridge
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Reassessment of the Uncertainties of the NRC Cryogenic Current Comparator and Quantum Hall Resistance Standard
摘要： This paper describes the main sources of error in the NRC Cryogenic Current Comparator (CCC) and Quantum Hall Resistance Standard (QHR) systems and reports their estimated uncertainty. The CCC type B uncertainty is evaluated to be 0.26 parts in 109, with the largest contribution being the effect of a noise-induced offset in the Superconducting Quantum Interference Device (SQUID). The relative uncertainty of the QHR system is estimated at 0.28 × 10-9, with comparable contributions from leakage resistances between the leads and finite dissipation on the QHR sample.
关键词： Quantum Hall Resistance,Resistance bridge,Cryogenic Current Comparator,SQUIDs
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - A Novel Method for Calibrating Automatic Direct Current Comparator Resistance Bridges
摘要： In order to reduce measurement uncertainty of the resistance (10-1 ? ~ 105 ?) due to the uncertainty component from the automatic direct current comparator resistance bridge (ADCCRB) ratio error, a novel method based on a direct current comparator (DCC) and two same nominal resistances is presented. The measurement uncertainty of the ADCCRB ratio error is largely dependent on DCC and Type A uncertainty of the ADCCRB. It is shown by the experimental results that the measurement uncertainty from the ADCCRB (ratio：10:1) is less than 3×10-8, k = 2.
关键词： calibration,DC resistance,measurement uncertainty,ratio,bridge,DCC
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - An AC Four-Terminal Low Value Resistance Bridge
摘要： This paper describes a current transformer based ac four-terminal low value resistance measurement bridge. The design and performance of this bridge is presented, which compares resistors from 10 to 0.1 ohm over a frequency range of 100 Hz-10 kHz. The reference ratio arm used in this bridge is a special designed high accurate zero-flux current transformer (ZFCT). The current ratio value of the ZFCT is self-calibrated by using the conventional build up method. An auxiliary current transformer combined with variable impedance is used to constitute the wagner circuit.
关键词： zero-flux current transformer,ac bridge,resistance measurement,Measurement
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Traceability Chain Establishment at KRISS from DC QHR to Farad Using AC-DC Calculable Resistor Standard and Digitally Assisted Coaxial Bridges
摘要： A national traceability chain from dc quantum Hall resistance (QHR) to capacitance has been established at KRISS using various impedance standards and ac coaxial bridges. Two bridges developed by INRiM, were employed: a quadrature bridge, calibrating 1000 pF capacitors versus 103 kΩ ac resistors and a ratio bridge, linking the ac resistor values to an ac-dc calculable resistor calibrated in terms of the dc QHR. The capacitance value obtained with the new traceability chain showed an agreement (a few parts in 107) in a comparison with the scale maintained at National Institute for Standards and Technology (NIST, USA).
关键词： Traceability chain,digitally assisted coaxial bridge,farad
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - 10 TΩ and 100 TΩ Resistance Comparison Between NIST and AIST
摘要： We report the results of a comparison of 10 T? and 100 T? high resistance standards between the National Institute of Standards and Technology (NIST) and the National Institute for Advanced Industrial Science and Technology (AIST). Three standard resistors were hand carried between both laboratories, a 100 T? from NIST and a 10 T? and 100 T? from AIST. The two laboratories agreed to within 100 x 10-6 at 10 T? and 500 x 10-6 at 100 T?. The comparison results have given both laboratories an external check of their measurement systems and scaling processes to 100 T?.
关键词： dual source bridge,high resistance,uncertainty,voltage injection,standard resistor
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - A Synchronized Current-Comparator-Based Power Bridge for Calibrating Analog Merging Units
摘要： A synchronized current-comparator-based power bridge for calibrating analog merging units at power frequencies of 60 Hz and 50 Hz is described. Analog merging units take analog signals from instrument transformers, convert them into digital form, pack the sampled values into Ethernet frames conforming to the IEC 61850-9-2 LE specification and stream the frames to other equipment in a digital substation for further processing. Since the sampled values are used for protection and metering, the merging units need to be calibrated. The expanded uncertainties (k=2) of the described calibration system are estimated to be better than 30 μA/A for magnitude and 60 μrad for phase.
关键词： calibration,current comparator,measurement uncertainty,Instrument transformers,power bridge,merging unit
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Four Terminal Pair Digital Sampling Impedance Bridge up to 1 MHz
摘要： This paper describes a new four terminal pair digital sampling impedance bridge for frequency range up to 1 MHz. The bridge was primarily designed for a calibration of a phase angle of the current shunts. However, the bridge is capable of comparing any impedance standards up to approximately 100 kW in a full complex plane. The experimental measurements of the known standards showed the bridge deviations is below 50 μW/W and below 500 μrad at 1 MHz.
关键词： Bridge circuits,sampling methods,impedance measurement,shunts (electrical),phase comparators
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Comparison of Two High Accuracy Room Temperature Methods to Calibrate a 10 kΩ Standard with the Quantized Hall Resistance
摘要： This paper describes a comparison of two methods to calibrate a 10 k? standard resistor respect to the Quantized Hall Resistance (QHR). One method is based in a Room Temperature Current Comparator Bridge and the other one is based in a Resistive Transfer Standard (RTS) developed at CEM in its different configurations, one of which is the QHR value. In this way we’ll test the suitability of both methods to perform QHR measurements.
关键词： Resistive Transfer Standard,measurement,uncertainty,measurement techniques,Current comparator bridge,Quantized Hall Resistance,Hamon transfer standard
更新于2025-09-10 09:29:36