- 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) - Precision Characterisation of Current Transformers and Shunts in the Audio Frequency Range
摘要： This paper presents a technique to compare two current transformers, or a current transformer and ac current shunts, with an uncertainty better than 1 μA/A and 1 μrad at audio frequencies. Examples of such a comparison at frequencies from 10 Hz to 10 kHz are given. Due to its low uncertainty, the described technique made it possible to accurately measure critical parameters such as common-mode dependence of a current transformer and impedance variation of current shunts with ac current applied.
关键词： AC current,measurement,current transformer,current shunt
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) - External-Reference Stabilized Current Source with Sub-PPM Stability
摘要： The noise and stability of a commercial current source is limited by the quality of components used for construction, such as the voltage reference chips, resistors, and power supplies. A state-of-the-art commercial current source typically exhibits a stability no better than parts in 107. In this paper, we present a way to implement a current source with “external” electrical references. This approach allows the current source stability to be decoupled from the noise characteristics of the main power supply circuit. A few parts in 108 stability is demonstrated here.
关键词： Stability measurement,Current measurement,Feedback circuit,Current supplies
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) - Calibration of the Second Generation of Ultrastable Low-Noise Current Amplifiers Using a Cryogenic Current Comparator
摘要： Following the established two-stage conception for the realization of the ultrastable low-noise current amplifier, new variants have been tailored to meet the special requirements of demanding applications. Changes include new components selected according to stability criteria and new design parameters. For most of these variants, calibration capabilities based on a cryogenic current comparator setup have been developed. The overview given in this contribution will focus on aspects of the achievable measurement uncertainty.
关键词： current comparator,current measurement,measurement uncertainty,Calibration,precision measurements,low-noise amplifiers
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 Sampling Wattmeter with Extended Frequency Range
摘要： This paper describes the implementation of a sampling wattmeter for the measurement of sinusoidal active and reactive power over the 50 Hz to 6 kHz frequency range, 20 V to 600 V voltage range, and 0.05 A to 80 A current range. The wattmeter is capable of measuring sinusoidal and distorted voltage and current signals with up to 100 harmonics of the fundamental frequency component. Details of the system design, measurement techniques, and signi?cant sources of error are presented.
关键词： power measurement,digital-analog conversion,current measurement,signal synthesis,voltage measurement,permuting capacitance,Analog-digital conversion,quantization
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE 23rd International Conference on Emerging Technologies and Factory Automation (ETFA) - Torino, Italy (2018.9.4-2018.9.7)] 2018 IEEE 23rd International Conference on Emerging Technologies and Factory Automation (ETFA) - An Energy Measurement System for Characterization of Energy Harvesting Systems
摘要： Energy neutral computing is seen as a design approach for wireless sensor nodes (WSN) which are powered by energy harvesters. The approach relies on keeping an equilibrium between consumption and harvesting of energy and typically uses models for energy prediction and management. To adapt models to specific systems and environments, often characterization measurements are used. Measurements strongly influence the model quality and with this the usability of such WSN. In this paper a novel measurement system (PiEMS) is presented that outperforms existing approaches and helps to optimize typical characterization tasks. The increased accuracy of characterization and modeling are exemplified for different WSN applications.
关键词： Wireless sensor node (WSN),Characterization,Energy harvesting,Energy neutral computing,Current measurement,Low power measurement,Energy measurement system
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) - Increasing Quantized Single-Electron Current Accuracy in a Tunable Barrier Pump by Two-Gate Modulation
摘要： Tunable barrier single-electron pumps (SEPs) have recently shown their great potential as high precision current source with direct link to the electron charge. The quantization of SEPs realized in gallium-arsenide semiconductors and driven by a single alternating control voltage routinely shows sub-ppm accuracy when applying high magnetic field. However, their accuracy without field is presently much lower. We now have found that modulation of two gates can increase accuracy in zero magnetic field and have confirmed the current quantization I = ef for a frequency of 84.5 MHz within the measurement uncertainty of less than 1 ppm.
关键词： current measurement,quantized current,Single-electron pump
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) - Calibration of Current Shunt Standards in the Megahertz Region
摘要： Beyond 1 A (from 2 A to 100 A typically) standard current shunts are currently calibrated in magnitude up to 100 kHz and in phase angle up to 200 kHz. For such high current levels and above these frequencies the existing traceable measurement methods are not able to characterize current shunts and cannot provide the phase and magnitude of impedance simultaneously. This paper briefly describes a new broadband method for measuring current shunt standards beyond 1 A in the megahertz region and presents experimental results demonstrating the efficiency of this approach.
关键词： Calibration method,current measurement,VNA,uncertainty,current shunt,phase angle,wideband measurements,ac-dc difference
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) - Accurate Measurement at the Nanoscale of Remnant Polarisation Charge in Ferroelectric Films
摘要： A method for the measurement of the remnant polarisation charge of ferroelectric ?lms at the nanoscale is proposed. It is based on current measurement by an atomic force microscope and imposes a capacitive correction in order to extract the signal from the noise, several orders of magnitude higher than the signal to be measured. A remnant charge of 4.2 fC could be measured on a PbZrTiO3 thin ?lm. Solutions to decrease the noise are proposed.
关键词： ferroelectric materials,remnant polarisation,nanoscale current measurement,Atomic Force Microscopy
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) - Progress in Fluxgate Current Transducers
摘要： This paper describes recent technological progress in the field of high accuracy fluxgate current transducers. After an introduction into the subject, followed by advantages and limitations, innovative waveforms for fluxgate excitation and their digital signal processing are described in more detail, followed by an explanation of key performance parameters of a new product.
关键词： Current measurement,ripple suppression,low noise,digital signal processing,high accuracy,fluxgate
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) - Inter-Laboratory Nanoamp Current Comparison with Sub-Part-Per-Million Uncertainty
摘要： An ultrastable low-noise current amplifier (ULCA) has been transferred between two laboratories, NPL and PTB, four times, with three of the transfers yielding a relative change in the trans-resistance gain of less than 2×10-7. This is a new benchmark for inter-laboratory transfer of small current.
关键词： calibration,low noise amplifiers,current measurement,precision measurements
更新于2025-09-10 09:29:36