Analyser meets current harmonic standard
A PDS Instruments product story
Edited by the Electronicstalk editorial team Jul 16, 2007
Power analyser comes with independent certification of accuracy for interharmonics measurements to IEC61000-3-2.
The Voltech PM6000 power analyser has become the world's first to gain independent certification of accuracy for interharmonics measurements to IEC61000-3-2, the international product compliance standard for current harmonic emissions.
Working with the National Physical Laboratory (NPL) in Teddington UK, Voltech devised a test regime to show that the PM6000 meets all the requirements of the standard, including accuracy, measurement methods and limit checking for the different product classes A, B, C and D.
Until now, certification has only been available for normal harmonics at multiples of the fundamental frequency: 100, 150, 200Hz up to 2000Hz.
The latest version of IEC61000-4-7 requires measurements of interharmonic amplitudes and specifies the precise method of analysis.
The PM6000's use of discrete Fourier transforms (DFTs) as opposed to the conventional fast Fourier transform (FTT) means it can achieve the required accuracy with ease because the DFT does not suffer the problems of frequency synchronisation and the resulting harmonic leakage that are inherent in an FFT analyser.
The Voltech PM6000 power analyser provides design and EMC engineers with a foolproof yet easy-to-use solution for testing to IEC61000-3-2 (harmonics) and IEC61000-3-3 (flicker and manual switching) that avoids the uncertainties of alternative methods.
Since these standards became compulsory requirements for all electrical equipment (rated up to 16A) sold in Europe 10 years ago, Voltech has always led the field to provide traceable measurement solutions for design and EMC engineers.
The superior DFT method has not been used before now in a commercial analyser for IEC harmonics testing because it requires considerably more signal processing power than FFT.
The PM6000 was designed with these requirements in mind and uses powerful digital signal processing techniques to generate thousands of harmonic measurements every second.
The PM6000's PC software is used to set up tests, to compare the results with the limits for classes A, B, C and D and to provide diagnostic information as well as clear pass/fail reports suitable for inclusion in product technical construction files.
As well as forming the heart of a full compliance IEC harmonics and flicker test system (when used with a suitable ac source and impedance), the PM6000 is ideal for making precompliance measurements when used on its own.
The Voltech PM6000 unit is available in the UK from PDS Instruments.
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