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Träfflista för sökning "WFRF:(Mašláň Stanislav) "

Sökning: WFRF:(Mašláň Stanislav)

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1.
  • Mašláň, Stanislav, et al. (författare)
  • Four Terminal Pair Digital Sampling Impedance Bridge up to 1 MHz
  • 2019
  • Ingår i: IEEE Transactions on Instrumentation and Measurement. - 0018-9456 .- 1557-9662. ; 68:6, s. 1860-1869
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper describes a new four terminal pair digital sampling impedance bridge designed for frequency range up to 1MHz and small impedances, such as shunts. The bridge is capable of comparing impedance standards of arbitrary ratios in a full complex plane from approximately 100 kΩ down to 50mΩ, limited by maximum achievable current 3 A. To keep low uncertainties a new multiplexer was designed and a very simple and fully automated linearity correction method based on the pair of calculable resistors was developed and validated. The paper describes the design and details of the bridge topology, basic uncertainty budget and first results of the validation. The expanded uncertainty of impedance module is about 50 μΩ/Ω at 1MHz for impedance ratios up to 1:16 and voltage drops above 10mV and the expanded uncertainty of a phase angle was about 360 μrad/MHz. Expanded uncertainty for frequency 100 kHz about 10 μΩ/Ω was reached. Typical expanded uncertainty for low impedance ratios below 1:1.1 is only 35 μΩ/Ω. Set of measurement of impedance standards of known values and a small international comparison of ac-dc and phase angle errors of current shunts were carried out to validate the bridge capabilities in wide range of impedances. The validation measurements showed the deviations of the bridge are below 35 μΩ/Ω and below 350 μrad at 1 MHz.
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2.
  • Nováková Zachovalová, Věra, et al. (författare)
  • Introduction and progress in the EMPIR project TracePQM : Traceability Routes for Electric Power Quality Measurements
  • 2018
  • Ingår i: Journal of Physics. - : Institute of Physics Publishing.
  • Konferensbidrag (refereegranskat)abstract
    • Increasing demands for traceable, accurate measurements of power and power quality (PQ) parameters have resulted in an intensive metrology research effort in this area. This paper describes the objectives and so far achieved results of the EURAMET EMPIR Project TracePQM (15RPT04), jointly founded by the European Union and the participating countries. The overall goal of this project is to develop an open, modular, and well documented metrology grade system for measurement of power and PQ parameters by means of digital sampling techniques available to everyone and to increase research capacity in this area.
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