Yokogawa WT1800 precision power analyser

The Yokogawa WT1800 precision power analyser is the latest addition to the company’s range of digital power measuring instruments.

Replacing the WT1600, an industry standard for many years, the WT1800 offers innovative measurement functions which benefit engineers with electrical power and efficiency measurements in a range of industries from inverter and drive design to alternative energy systems.

The WT1800 can perform up to six power input measurements, which makes it possible to perform efficiency tests between the input and output of products such as inverters. With its high-resolution 8.4″ XGA display, the instrument is simple to set up and display up to 12 different pages of measurement items in formats such as numeric, waveforms and trends.

The WT1800 has a power measurement bandwidth from DC and 0.1 Hz to 1 MHz. Basic power measurement accuracy is 0.1% of reading plus 0.05% of range.

For electric motor testing applications, the WT1800 offers a motor evaluation function which has measurements of all the relevant electrical power parameters along with rotational speed, torque, mechanical power, synchronous speed, slip, motor efficiency and total system efficiency.

Moreover, A-phase, B-phase and Z-phase input terminals have been added for advanced motor analysis. These signals make it possible to detect the rotational direction of the motor as well as the electrical angle measured using the Z-phase signal.

Harmonic analysis can be carried out up to the 500th order from a 50 or 60 Hz fundamental frequency.

A dual harmonic measurement function makes it possible to simultaneously measure the harmonic content and perform harmonic analysis on two different sources, such as the input and output of an inverter, variable-speed motor drive, lighting ballast, uninterruptible power supply or similar devices. The normal power parameters and harmonic data are measured simultaneously, providing for faster and more accurate power analysis.

A power integration function which can be used to measure the amount of power sold or purchased in grid interconnection applications is also available. The WT1800 features Yokogawa’s average active power function, making it possible to measure power consumption under conditions where the power fluctuates greatly.