Andrés E. Legarreta, Javier H. Figueroa, Julio A. Bortolín
Power Quality assessment is today one of the main ways to improve energy efficiency. International standards tend to restrict the way this assessment is done, by defining the measurements methods that should be adopted by an instrument. This work describes some of the constrictions and requirements assumed for the design of the high performance Power Quality data logger PQ1000, taking into account the international standards IEC 61000-4- 30 Class A and the IEC 61000-4-15 published in August 2010. Trough it, the most important demands of the IEC 61000-4-30 class A instruments are exposed....
TC4 Symposium 2011
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O. Velychko, М. Surdu, S. Shevkun
The materials on evaluation of the combined standard and expanded uncertainty of measurements at calibration of working standards of inductance on the State primary standard of the units of inductance are presented.
TC4 Symposium 2011
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D. Slomovitz, L. Trigo, C. Faverio
To fulfill the requirements of very high accuracy wattmeters, a current to voltage transducer was developed. The nominal input currents go from 1 A up to 100 A, and the nominal output voltage is 2 V. The goal is to get uncertainties in the order of 1 part in 106.
TC4 Symposium 2011
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Michael Coleman, Thomas J. Wiandt, Thomas G. Harper
At Fluke’s Primary Temperature Calibration Laboratory, we recommend that our calibration customers monitor SPRT and PRT drift by tracking each thermometer’s resistance at the triple-point of water (RTPW). We also encourage our customers to update their temperature readout with the thermometer’s RTPW value measured by the same readout whenever it is possible. This is important since RTPW is used by the readout to calculate temperature. In response to these instructions, our customers often ask how much an SPRT or PRT should be allowed to drift at the triple-point of water (TPW) before it...
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Michael Coleman
Industry trends are leading toward the need for improved accuracy in field calibration applications. The dry-block calibrator is the most common type of heat source used in field temperature calibrations but can be difficult to correctly address in a comprehensive uncertainty analysis. Significant sources of error or uncertainty are often overlooked or underestimated. It is proposed that through the use of modern best practices in temperature metrology, the sources of error can be properly accounted for and managed to result in calibration uncertainties from 20 to 50 mK (milliKelvin) over...
TC4 Symposium 2011
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Walter F. Adad, Ricardo J. Iuzzolino
This paper presents a low distortion signal generator with a frequency range from 0 to 10 kHz using the direct digital synthesis (DDS) method for ADC characterization. The results show that the maximum distortion in the whole frequency range is -80.37 dB, the frequency resolution is 1.421 nHz (with a 48-bits DDS chip), the stability in frequency is 25 μHz/Hz and the amplitude stability is 13 μV/V.
TC4 Symposium 2011
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Joalbo Borges Santos, Amauri Oliveira, Carlos Eduardo Trabuco Dórea, Daniel Gonçalves de Souza Neto,Tanguy Phulpin
This paper presents the application of feedback linearization for the characterization of thermoresistive sensors and for feedback measurement systems using these sensors kept at constant temperature. This technique allows the generation of an input signal which is proportional to the electric power of the sensor, simplifies the characterization with the possibility of determining thermal conductance and intrinsic time constant of the sensor in a single test. Concerning the feedback measurement system, this technique improves features of the measurement system with the possibility of use a...
TC4 Symposium 2011
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Scarlat, R. Minea, A. Scarisoreanu, E. Badita, E. Sima, M. Dumitrascu, E Stancu, C. Vancea
National Institute for Laser, Plasma and Radiation Physics (INFLPR) has constructed a High Energy Secondary Standard Dosimetry Laboratory SSDL –STARDOOR – for performing dosimetric calibrations according to ISO IEC SR/EN 17025:2005 standards. This is outfitted with UNIDOS Secondary Standard Dosimeter from PTW ( Freiburg Physikalisch-Technische Werkstätten) calibrated at the PTB7Braunschweig (German Federal Institute of Physics and Metrology). A radiation beam of the quality of Q used by our laboratory as calibration source are provided by INFLPR 7 MeV electron beam linear a ccelerator...
TC4 Symposium 2011
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R. Caballero, J. Diaz de Aguilar, Y. A. Sanmamed, M. Neira
A measurement system for the ac-dc transfer difference of thermal converters whose power response is not exactly quadratic is presented. The previous method, due to the simplifications of the equations, was not valid for those ac-dc transfer standards with a sensibility slightly different from 2. The error in using these equations for those standards has been evaluated and can be as high as 20 μV/V when dealing with single junction thermal converters whose sensibilities can be around 1.6. In the new measurement system, some terms, before considered negligible, have been retained. A modified...
TC4 Symposium 2011
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Y. A. Sanmamed, A. Sánchez, K. Schweiger, J. Díaz de Aguilar, R. Caballero,M. Neira
Inductance has been realized at Spanish Centre of Metrology (CEM) by means of a modified coaxial Maxwell-Wien bridge. This method ensures inductance traceability from the SI unit of capacitance and establishes the value of the CEM’s set of 10 mH standard inductors at the frequency of 1 kHz.
TC4 Symposium 2011
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