Hartland, MI, United States
Hartland, MI, United States

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Rietveld G.,National Metrology Institute of Netherlands | Zhao D.,National Metrology Institute of Netherlands | Kramer C.,Trescal Inc. | Houtzager E.,National Metrology Institute of Netherlands | And 4 more authors.
IEEE Transactions on Instrumentation and Measurement | Year: 2011

A two-channel high-speed digitizer has been extensively characterized in the frequency range of 50 Hz-1 MHz. Measurements involved alternating-current (ac) flatness, phase, linearity, input impedance, and the effects of direct-current offsets, temperature, and an internal self-calibration routine. A digital antialiasing filter inside the digitizer negatively affects ac flatness in the low-frequency region. An inverse compensation filter has been designed and applied, which improves frequency response with a factor of 25-60 and makes it flat within 25 μV/V up to 100 kHz and within 100 μV/V up to 1 MHz. The phase difference between the two channels can be modeled by a constant time delay between the two channels, which for the 2-V pp range equals (250 ± 30) ps. The overall results of the characterization indicate that the digitizer can be applied in wideband power measurements under practical circumstances with (k = 1) uncertainty contributions of not more than 70 and 400 μW/VA at 10 kHz and 1 MHz, respectively. This uncertainty excludes loading effects, which are significant at frequencies above 100 kHz. At low frequencies, up to three times lower uncertainty are achieved when the digitizer is calibrated at the signal level and temperature at which it is subsequently used. © 2006 IEEE.


Rietveld G.,VSL | Kramer C.,Trescal Inc. | Houtzager E.,VSL | Kristensen O.,Trescal Inc. | And 4 more authors.
CPEM Digest (Conference on Precision Electromagnetic Measurements) | Year: 2010

A commercial two-channel high-speed digitizer is extensively characterized in the frequency range of 50 Hz to 1 MHz. The measurements involve flatness, linearity, phase, and the effects of loading, dc offsets, and temperature. The results indicate that the digitizer can be applied in wideband power measurements with an uncertainty better than 1 % at 1 MHz. © 2010 IEEE.


Wright P.S.,National Physical Laboratory United Kingdom | Christensen A.E.,Trescal Inc. | Davis P.N.,National Physical Laboratory United Kingdom | Larson B.,SP SE | And 2 more authors.
CPEM 2016 - Conference on Precision Electromagnetic Measurements, Conference Digest | Year: 2016

The importance of Power Quality (PQ) to the operation and management of electrical power networks is described. A discussion is given on the propagation of PQ phenomena. Preparations for a measurement campaign using multiple GPS synchronised digitisers and associated transducers on an island operating with high renewable penetration (Smart Grid) are described. Results from this campaign will be used to formulate models for PQ propagation that can be used to plan and manage future Smart Grids. © 2016 IEEE.


Zhao D.,Dutch Metrology Institute | Rietveld G.,Dutch Metrology Institute | Braun J.-P.,Federal Institute of Metrology METAS | Overney F.,Federal Institute of Metrology METAS | And 2 more authors.
CPEM Digest (Conference on Precision Electromagnetic Measurements) | Year: 2014

In order to perform traceable measurements of the electrical parameters of solid-state lightning (SSL) products, it is essential to technically adequately define the measurement procedure and to identify the relevant uncertainty sources. This paper fills the related gaps in the present written standard for testing SSL products. New uncertainty sources with respect to conventional lighting sources are determined and their effects quantified. For power measurements on SSL products the main uncertainty sources are temperature dependence, power supply THD, and stabilization of the SSL product. For current rms measurements the influence of bandwidth, shunt resistor, power supply source impedance, and ac flatness error are significant as well. © 2014 IEEE.


Un acteur spcialis et indpendant Indpendant des constructeurs d'instruments, Trescal dispose de la plus large gamme de comptences techniques du march


A specialised and independent actor Independent from manufacturers, Trescal offers the biggest range of technical expertise on the market


Trescal is now established in New Jersey Following its recent acquisitions in San Francisco, Atlanta, Baltimore and Charlotte, Trescal is now established in Newark, New Jersey


Kundennhe liegt uns am Herzen Unser Netzwerk akkreditierter Laboratorien steht Ihnen Regional zur Verfgung. Wir orientieren unser Leistungs-angebot an Ihren Bedarf nach messtechnischen Dienst-leistungen


Un acteur spcialis et indpendant Indpendant des constructeurs d'instruments, Trescal dispose de la plus large gamme de comptences techniques du march


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