ZES ZIMMER's LMG670 power analyzer measures narrowband, full-spectrum, and harmonics simultaneously



LMG670 precision power analyzer

When it comes to increasing efficiency, precise power analysis plays an ever-growing role. In electric vehicle research and variable frequency drive applications the fundamental and the full spectrum often have to be measured simultaneously. In the past users had to accept a compromise: they had to choose between narrowband and full spectrum values. With the LMG670 precision power analyzer both become available at the same time. The innovative DualPath architecture enables the user to measure narrowband and full spectrum values up to 10 MHz simultaneously – free of aliasing defects – and to compare them in one view.

The LMG670 can also measure harmonics and interharmonics up to the 2,000th order according to EN 61000-4-7, a single click is sufficient to toggle between RMS values and harmonics. An optional I/O card allows parallel measurement of speed and torque values in perfect synchronization with RMS power values.

The new LMG670 can be equipped very flexibly with up to seven power measurement channels. According to the requirements of the application at hand, the user can choose between three types of power measurement channels, which offer different bandwidths and accuracies. The maximum obtainable accuracy is 0.015% of the measured value plus 0.01% of full scale. In addition, the excellent common-mode rejection ratio (CMRR) of >120 dB even at 100 kHz guarantees accurate results when measuring applications with steep rising edges and high pulse frequencies. Optimal matching of current and voltage channels ensures precise results also at very small power factors.

The user interface of the LMG670 is designed to provide quick access to all relevant functions. All parameters, like wiring, measurement range, filters etc. can conveniently be set via the 8.9” touch display (1024x600 WSVGA). Results can be displayed graphically as well as in tabular form, the user can easily switch between different views as needed.

ZES ZIMMER Electronic Systems