Yokogawa Test & Measurement Launches the WT5000 Precision Power Analyzer

–to meet the measurement needs of those who develop energy-efficient systems ––

Yokogawa Electric Corporation (TOKYO: 6841) announces that it has developed the next generation of precision power analyzers that offer exceptional measurement accuracy of ±0.03%. The WT5000 combines accuracy with stability, noise immunity and flexibility to meet the measurement needs of those who develop energy-efficient systems.

Development Background

In the rapidly evolving industry sectors of electric vehicles, renewable energy, and energy efficient technologies, the need for reliability in testing to enhance safety, efficiency and performance has never been greater. In the WT5000 Precision Power Analyzer, engineers have a versatile platform that delivers both reliable measurements for today’s needs and is flexible to meet the needs of tomorrow.

Yokogawa developed the WT5000 Precision Power Analyzer to help satisfy evolving application requirements and ever-changing international standards that call for custom measurements and consistent accuracy.

Product Features

1. Exceptional measurement accuracy
The WT5000 achieves the world’s highest measuring accuracy: ±0.03% at 50/60 Hz, allowing precision evaluation of power consumption, loss, and efficiency of electrical and electronic devices. The wide dynamic current range of the WT5000 is indispensable for testing 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 10 MS/s. This allows for precise capture of waveforms from the latest high-speed inverter devices while producing a stable measurement.

2. Up to 7 Input Channel Modular Flexibility
While the WT5000 has the same dimensions as existing models in Yokogawa’s WT series, it incorporates up to seven input channels, supporting applications that previously would have required synchronization of 2 multiple 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 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. These options support A, B, Z position signals from encoders as well as analog or pulse type signals from torque meters.

Harmonic measurements for multi-phase systems is greatly enhanced due to the 7 element input design. Simultaneous dual harmonic analysis can be performed up to the 500th order and up to a 300 kHz fundamental waveform. This enables measurement of the fundamental frequency from the rotational speed of the motor, while also checking the influence of the switching frequency from inverter drive.

3. External sensor input function is fitted as standard
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 in order 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. Yokogawa AC/DC CT series sensors are current output in order to minimize the influence of noise, the 5A input element is well suited for use with these current sensors.

Major Target Markets

  • Producers of larger current devices such as electric vehicles and large-scale solar installations
  • Companies and other organizations that test electric vehicles, renewable energy, and energy efficient technologies


  • Manufacturing testing and inspection, in addition to research and development of products requiring high precision power testing
  • Applications involving electric vehicles or fuel-cell vehicles, where developers are increasingly required to evaluate a number of different motors.

About the WT5000 Precision Power Analyzer

The WT5000 Precision Power Analyzer precisely tests and evaluates power output and loss with consistency and accuracy. This power analyzer accommodates a variety of plug-in options to streamline efficiency and 3 reduce or eliminate the need for multiple devices in the power testing phase. Users have the flexibility to utilize the features of the WT5000 specific to their application, increasing efficiency and providing cost savings while producing extremely accurate results.

About Yokogawa

Founded in 1915, Yokogawa engages in broad-ranging activities in the areas of measurement, control, and information. The industrial automation business provides vital products, services, and solutions to a diverse range of process industries including oil, chemicals, natural gas, power, iron and steel, and pulp and paper. With the life innovation business the company aims to radically improve productivity across the pharmaceutical and food industry value chains. The test & measurement, aviation, and other businesses continue to provide essential instruments and equipment with industry-leading precision and reliability.

Yokogawa co-innovates with its customers through a global network of 112 companies spanning 61 countries, generating US$3.8 billion in sales in FY2017. For more information, please visit www.yokogawa.com The names of corporations, organizations, and products herein are either trademarks or registered trademarks of their respective holders.

Related Products & Solutions

WT5000 - Precision Power Analyzer

  • Precision power analyzer with superior accuracy
  • 7 swappable input elements
  • 4 motor inputs
  • Harmonics test compliant to IEC 61000-3-2

Precision Making