New Industry Products

Yokogawa’s WT5000 Ushering in the Next Generation of Precision Power Analyzers

October 03, 2018 by Yokogawa Electric Corporation

This article highlights Yokogawa's WT5000 precision power analyzer that combines exceptional accuracy with stability, noise immunity, and flexibility.

“The new WT5000 combines exceptional accuracy with stability, noise immunity, and flexibility to meet the measurement needs energy-efficient systems developers.”

The Yokogawa WT5000 is the first of a new generation of precision power analyzers that offers exceptional measurement accuracy of ± 0.03% combined with stability, noise immunity, and plug-in modular flexibility to meet the measurement needs of today’s developers of energy-efficient systems.

In rapidly evolving industry sectors like electric vehicles, renewable energy, and energy-efficient technologies, the need for reliability in testing to enhance safety, efficiency, and performance has never been greater. Changing application needs and evolving international standards call for custom measurements and consistent accuracy. In the WT5000 Precision Power Analyzer, engineers have a versatile platform that not only delivers reliable measurements today but is ready for the challenges of tomorrow.

The WT5000 achieves the world’s highest measuring accuracy: ±0.03% of the total at 50/60 Hz. As a result, it has become possible to evaluate the power consumption, loss, and efficiency of electrical and electronic devices. In particular, its wide dynamic current range is indispensable for tests on energy-saving designs.

One of the essential elements for determining the performance of a power measuring instrument is the A/D converter that performs analog-to-digital conversion. 

In order to obtain the world’s highest measurement accuracy, the WT5000 uses an 18-bit converter with a sampling frequency of maximum 10 MS/s. As a result, it becomes possible to accurately capture waveforms from the latest high-speed inverter devices that are very effective for stable measurement results.

While the WT5000 has the same dimensions as existing models in Yokogawa’s WT series, it incorporates up to seven input channels, allowing it to support applications that previously could only have been measured by synchronizing several separate instruments. As a result, it offers considerable savings in installation space, communications overheads and cost-effectiveness. Further benefits result from the use of plug-in modular input elements, which can be swapped directly by the user.

The 30 A and 5 A elements, for example, can be switched for applications involving electric vehicles or fuel-cell vehicles, where developers are increasingly required to evaluate a number of 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. Since these options allow the input of four channels, flexible measurement of the A, B, C, and Z phases of each motor can be carried out.

With a seven-element input capability, multi-system measurement is increased in harmonic measurements on three-phase systems, for example. The WT5000 can carry out two harmonic measurement functions simultaneously, each at up the 500th order and up to 300kHz fundamental waveform. This makes it possible to measure the carrier frequency component from the rotational speed of the motor in the inverter drive and also to check the influence of the carrier frequency on the motor drive.

An increasing number of applications require the evaluation of large-current devices, typical examples being electric vehicles, and large-scale solar installations, in which external current sensors are often used. 

An external current sensor input function is fitted as standard in the input element of both the 30 A and 5 A input elements of the WT5000. For much higher currents (up to 2000 A RMS) dedicated high-current sensors are available.


About Yokogawa

Yokogawa is a leading provider of Industrial Automation and Test and Measurement solutions. Combining superior technology with engineering services, project management, and maintenance, Yokogawa delivers field proven operational efficiency, safety, quality, and reliability.


This article originally appeared in the Bodo’s Power Systems magazine.