Yokogawa WT1800 precision power analyser

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

Replacing the WT1600, the WT1800 offers measurement functions that benefit engineers with electrical power and efficiency measurements in a range of industries from inverter and drive design to alternative energy systems.

The analyser 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 can display up to 12 different pages of measurement items in formats such as numeric, waveforms and trends. A vector display is available for voltage and current phase analysis.

Many of today’s power conversion circuits use energy-saving switching techniques which can cause highly distorted voltage or current waveforms with high harmonic content. To measure these waveforms accurately, the WT1800 uses high-resolution 16-bit analog-digital converters with a digitising rate of 2 MS/s.

It 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, it has an evaluation function that offers, in a single unit, measurements of all the relevant electrical power parameters along with rotational speed, torque, mechanical power, synchronous speed, slip, motor efficiency and total system efficiency.

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

A programmable digital filter function enhances the capability to remove unnecessary harmonic components and noise superimposed on signals, such as from an inverter or variable-speed motor drive. This filter can be set independently for each input element, from 100 Hz to 100 kHz in 100 Hz increments. An analog filter is also provided for 300 kHz and 1 MHz filtering on each input element.

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.

For photovoltaic power generation applications, a maximum peak power tracking measurement is available to maximise the harvested power generated by photovoltaic cells.

A power integration function is also available which can be used to measure the amount of power sold or purchased in grid interconnection applications.

An event trigger function is incorporated to capture only a particular event.