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Precision Electromagnetic Measurements (CPEM), 2012 Conference on

Date 1-6 July 2012

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Displaying Results 1 - 25 of 376
  • Author index

    Publication Year: 2012, Page(s):1 - 68
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  • CPEM 2012 organizing committee

    Publication Year: 2012, Page(s):xxiv - xxv
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  • Technical program - Monday, July 2

    Publication Year: 2012, Page(s):xxvii - lii
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  • Sponsors

    Publication Year: 2012, Page(s): xxiii
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  • Table of contents by title

    Publication Year: 2012, Page(s):1 - 24
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  • Table of contents by session

    Publication Year: 2012, Page(s):1 - 29
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  • Welcome

    Publication Year: 2012, Page(s): xxvi
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  • Fundamental constants - the ultimate metric

    Publication Year: 2012, Page(s):1 - 3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (297 KB) | HTML iconHTML

    The proposed changes to the SI are generating considerable debate and discussion not just in metrology but also in the field of fundamental constants. This is an excellent time to reflect on general topics involving fundamental constants, units and the SI. In particular, it is useful to prepare for some of the obvious questions that will be forthcoming from the general public. View full abstract»

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  • Origins and history of the International System of Units, SI

    Publication Year: 2012, Page(s):4 - 5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB) | HTML iconHTML

    This paper outlines the origins and history of the International System of Units with particular reference to the historical development of units based on fundamental constants or invariants of nature. In the past, the ideas and the intention to proceed towards a unit system based on invariants of nature had existed but it has only recently become a practical possibility. The adoption by the 24 View full abstract»

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  • Adapting the international system of units to the 21st century

    Publication Year: 2012, Page(s):6 - 7
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (191 KB) | HTML iconHTML

    It is well known that the current definition of the kilogram in the SI, which is defined by reference to a prototype artifact, is unsatisfactory due to the fact that the mass of the prototype is drifting. Some of the other definitions of the base units of the SI are also due for revision and improvement. In October 2011 the CGPM passed a resolution approving plans for new definitions of the kilogr... View full abstract»

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  • Survey of planck constant measurements

    Publication Year: 2012, Page(s):8 - 9
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (491 KB) | HTML iconHTML

    The kilogram, unit of mass, is the last base unit of the International System of Units still defined in terms of a material artifact. A redefinition of the kilogram in terms of an invariant of nature, the Planck constant, is expected in the near future. A review of the present status of the experiments opening the way to this new definition will be presented. View full abstract»

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  • Survey of Boltzmann constant measurements

    Publication Year: 2012, Page(s):10 - 11
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB) | HTML iconHTML

    The international community started recently to look for a new way to define the kelvin. Since 2006, different experiments around the world have started to re-determined the Boltzmann constant and more than 7 experiments have obtain an uncertainty below 12 ppm in relative value. This presentation will describe the most promising methods. View full abstract»

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  • Error estimation of a 20 kA CT by the parameter measurement

    Publication Year: 2012, Page(s):12 - 13
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (313 KB) | HTML iconHTML

    To calibrate a Current Transformer CT, the Current Comparator CC must be most reliable standard [1][2]. However, it is difficult to assembling CC or estimating errors at high current. Meanwhile, there were some chances to test a high-current CT that exceeds a current limit of the existing traceable standard. The widely known parameter measurement should be a possible approach to prepare CT as a wo... View full abstract»

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  • Calibration of an instrument current transformer at a ratio of 20 kA/5 A

    Publication Year: 2012, Page(s):14 - 15
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (201 KB) | HTML iconHTML

    This paper presents two methods for determining the ratio error and phase displacement of an instrument current transformer (ICT) with transformation ratio 20 kA/5 A. In the first case, the primary conductor passed by a current 20 kA placed in the centre of the toroid is replaced by a current loop with 10 turns placed in the centre of the toroid. In the second case, the conductor is replaced by 10... View full abstract»

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  • CRTS & improved equivalent Ampere Turn method

    Publication Year: 2012, Page(s):16 - 17
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB) | HTML iconHTML

    This paper describes how to calibrate a window type high current transformer keeping with the traceability chain for the primary standard of a current comparator whose maximum allowable current 100 A. In order to expand a nominal current or current ratio of the current comparator, combination of the traditional equivalent Ampere Turns method and a Current Ratio Transfer Standard were proposed. View full abstract»

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  • PTB - UNIIM bilateral comparison on current transformer measurement systems at currents up to 60 000A

    Publication Year: 2012, Page(s):18 - 19
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (454 KB) | HTML iconHTML

    This paper presents the results of a bilateral comparison of current transformer measurement systems at 50 Hz between PTB (pilot laboratory) and UNIIM. The comparison is registered at COOMET with the identifier 513/DE-a/10. The comparison of the systems using two two-stage current transformers from UNIIM and the data processing have been finished. The results agree within 6 μA / A for the c... View full abstract»

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  • An improved method for switching-impulse evaluation

    Publication Year: 2012, Page(s):20 - 21
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB) | HTML iconHTML

    The standard IEC 60060-1:2010 “High-Voltage Test Techniques - Part 1: General definitions and test requirements” defines a parameter called “time to peak”. In addition it describes a method for evaluating the time to peak of switching-impulses. This method suffers from two problems. Firstly, the method is only to be applied to so-called standard switching-impulses. That... View full abstract»

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  • Measurement of the equivalent inductance of the high current shunts

    Publication Year: 2012, Page(s):22 - 23
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (214 KB) | HTML iconHTML

    We describe a method for the measurement of the equivalent inductance of the high current shunts against a four-terminal mutual inductance with the lock-in amplifier by means of the substitution method. The measurement results of Fluke A40B and metal foil shunts developed by BEV Austria at 50 A and 100 A at frequency up to 200 kHz are presented. View full abstract»

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  • A look at the sensitivity of the Thru-Reflect-Line vector network analyzer calibration algorithm

    Publication Year: 2012, Page(s):24 - 25
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (121 KB) | HTML iconHTML

    This paper looks at the sensitivity of the Thru-Reflect-Line and Line-Reflect-Line vector network analyzer calibration algorithms to changes in their inputs. Using a consistent measurement data set throughout, it highlights differences observed in the error-corrected measurements of a DUT when interchanging line standards and the effect of small changes to the value of the length of these lines. View full abstract»

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  • Investigation of a precision waveguide as phase standard for millimeter-wave vector network analysis

    Publication Year: 2012, Page(s):26 - 27
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (339 KB) | HTML iconHTML

    A precision WR10 rectangular-waveguide is manufactured and investigated as phase standard for vector network analyzer (VNA) measurements in the frequency range 75-110 GHz. The waveguide width along the direction of propagation is measured by an air gauge system using a specially designed air probe. To verify the phase of the reflection coefficient of a calibrated VNA, the precision waveguide is te... View full abstract»

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  • Broadband cryogenic calibration two-port superconducting resonators

    Publication Year: 2012, Page(s):28 - 29
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    Superconducting resonators are useful for precision electromagnetic measurements, so broadband cryogenic calibration of these resonators are important. We found that a traditional three standards calibration, the Thru-Reflection-Line calibration, fails to calibrate the transmission lines between a vector network analyzer and a cryogenic two-port resonator. Here we introduce a modified calibration ... View full abstract»

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  • Double step attenuation measurement technique for high attenuation of variable attenuators

    Publication Year: 2012, Page(s):30 - 31
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (150 KB) | HTML iconHTML

    An accurate solution of a double step attenuation measurement technique with an internal gauge block for variable attenuators is presented. The solution is obtained by solving the signal flow graph of the circuit model with a small reflection coefficient (<;0.1) on each I/O port. Experimental results both of low and high attenuation values show good agreement with measurements of the convention... View full abstract»

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  • A verification method for noise-temperature measurements on cryogenic low-noise amplifiers

    Publication Year: 2012, Page(s):32 - 33
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    We report a verification method for noise-temperature (NT) measurements on cryogenic low-noise amplifiers (LNAs) at liquid helium temperature. The method uses a comparison between the individual measurements of the LNA and an attenuator and the joint measurements of the tandem of the two. As a first step, we were able to determine the loss and the added NT of the cables that connected the cryogeni... View full abstract»

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  • The calibration target for FY-3 space-borne microwave humidity sounder

    Publication Year: 2012, Page(s):34 - 35
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    A general introduction is presented in this digest to describe configuration, operational theory and technical specifications of the calibration target for FY-3 space-borne microwave humidity sounder of china. The target with the temperature-adjusted function based on PID controller can provide the brightness temperature output form 90K~350K and its uncertainty is 1.2K~1.6K (k=2) in 75GHz~220GHz. ... View full abstract»

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  • Investigation of systematic errors of an AC Josephson Voltage Standard

    Publication Year: 2012, Page(s):36 - 37
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (161 KB) | HTML iconHTML

    This paper presents results of experiments quantifying two systematic errors associated with the calibrations by use of an AC Josephson Voltage Standard: the change in the voltage leads error with the change in the level of probe immersion in the liquid helium, and the effect of the internal inductance of a Josephson array. The measurements were performed at frequencies 100 kHz and above, however,... View full abstract»

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