Precision power analyser has world’s highest measuring accuracy: the Yokogawa WT5000

24 September 2018

Credit: Yokogawa Europe
Credit: Yokogawa Europe

The WT5000 marks a new generation of Precision Power Analyzer that offers exceptional measurement accuracy: ± 0.03%, and this is combined with stability, noise immunity and plug-in modular flexibility to meet developers’ measurement needs for 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: one that not only delivers reliable measurements today, but is ready for the challenges of tomorrow, too.

As mentioned, the WT5000 achieves the world’s highest measuring accuracy: ±0.03% of 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 analogue-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. It is 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 synchronising 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 that involve 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 allow the input of four channels, and this enables the flexible measurement of the A, B, C and Z phases of each motor.

With a 7-elements input capability, multi-system measurement is increased in harmonic measurements on 3-phase systems, for instance. The WT5000 can carry out two harmonic measurement functions simultaneously, each at up to 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 larger-current devices, typical examples being electric vehicles and large-scale solar installations. In these cases, external current sensors are often used.

Moreover, 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. And for much higher currents (up to 2000 A RMS), dedicated high-current sensors are also available.

For further information about the WT5000 Precision Power Analyzer please visit:

Contact Details and Archive...

Print this page | E-mail this page