Analyzing the overall efficiency of drive-motor combinations is a task that requires specialized measurements. The analysis must determine how much drive output power matches the motor’s fundamental frequency to calculate torque contribution if the harmonics are in compliance with the stated requirements and the quality of output power over the entirety of the frequency band.

The instrumentation to meet these demands must satisfy a variety of criteria. The sampling rate must be high enough, there must be enough channels for both input and output phases to be measured, and there must be integrated harmonics analysis. Furthermore, precision requirements must be met for all criteria. Even with these requirements satisfied, traditional approaches cannot provide results through an individual test.


Tests must be repeated, once with filtering and once without filtering. There’s no other way to get a reliable measurement out of conventional power analysis devices. Repeating the same test twice to retrieve usable results is a formidable task. Every variable must be reset to the initial conditions before the next test, potentially wasting significant amounts of time and effort.

There’s a straightforward way to avoid all of these considerations. The ZES Zimmer LMG670 incorporates an exclusive DualPath architecture to provide both filtered and unfiltered testing simultaneously. The power analyzer features twin A/D converters in the two distinct signal paths for every channel. Both measurements can now be taken simultaneously without any risk of aliasing. The Wise-Tech LMG670 product page provides more information on this product and how to request a quote for your power analyzer needs.