Power Analyzer Verifies Energy Efficiency

Yokogawa Electric Corporation’s next-generation WT5000 precision power analyzer offers a measurement accuracy of ±0.03%. This enables precision evaluation of power consumption, loss, and efficiency of electrical and electronic devices. To obtain the highest measurement accuracy, the unit relies on an 18-bit converter with a sampling frequency of 10 Msamples/s. This allows for precise capture of waveforms from the latest high-speed inverter devices while producing a stable measurement.


The WT5000 has the same dimensions as existing models in Yokogawa’s WT series and provides up to seven input channels. Other features include plug-in modular input elements, which can be swapped directly by the user. The 30 A and 5 A elements can be switched for applications involving electric vehicles or fuel-cell vehicles, where developers are increasingly required to evaluate several different motors. Using the WT5000 equipped with the /MTR1 and /MTR2 options, it is possible to evaluate up to four motors simultaneously with one unit. These options support A, B, Z position signals from encoders as well as analog or pulse type signals from torque meters.

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An external current sensor input function is fitted as standard in the input element of both the 30A and 5A input elements of the WT5000 to meet the needs of an increasing number of applications that require the evaluation of larger-current devices, such as electric vehicles and large-scale solar installations. For much higher currents (up to 2000A RMS) dedicated high-current sensors are available. For greater insights, checkout the WT5000 datasheet.

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