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Power analyser is first to measure values simultaneously

25 June, 2014

A German company that specialises in power-measuring instruments claims to have developed the first power analyser that can measure narrowband, full-spectrum and harmonics values simultaneously.

ZES Zimmer Electronic Systems says that while fundamental and the full spectrum values often need to be measured simultaneously in applications such as variable-frequency drives, users have previously had to choose between narrowband and full-spectrum values.

The company’s new LMG670 power analyser does both at the same time. It allows users to measure narrowband and full-spectrum values up to 10MHz simultaneously, free of aliasing defects, and to compare them in one view.

The instrument can also measure harmonics and inter-harmonics up to the 2,000th order, in accordance with EN 61000-4-7. A single click toggles between RMS values and harmonics.

An optional I/O card allows parallel measurement of speed and torque values synchronised with the RMS power values. The analyser can be equipped with up to seven power measurement channels. Users can choose between three types of power measurement channels, with different bandwidths and accuracies, to suit their application.

ZES Zimmer says that its LMG670 power analyser is the first of its type

The maximum obtainable accuracy is 0.015% of the measured value, plus 0.01% of full scale. In addition, the common-mode rejection ratio of >120dB, even at 100kHz, ensures accurate results when measuring applications with steep rising edges and high pulse frequencies. Optimal matching of current and voltage channels ensures precise results even at low power factors.

The user interface provides quick access to all relevant functions. Parameters such as wiring, measurement ranges, filters and so on can be set via the 8.9” touch display (1,024 x 600 WSVGA). Results can be displayed graphically or in a tabular form. 

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