Yokogawa Corp. of America has announced its latest precision power analyzer, the Model WT3000E, offering power measurement accuracy of 0.01% of reading +0.03% of range. This new addition to Yokogawa’s digital power analyzer product line offers innovative measurement functions that benefit the engineer needing to make electrical power measurements. It is a suitable measurement solution for testing product efficiency and the design of inverters, motor drives, lighting systems, uninterruptible power supplies, transformers, aircraft power systems, and other power conversion devices.
The WT3000E precision power analyzer is the enhanced model of the existing WT3000. Power electronics technology is being challenged for better energy conservation and improvement in the level of product efficiency. In order to evaluate the energy loss of the latest product designs more precisely, higher accuracy is required for the power measurement instruments. With its cutting-edge performance, the WT3000E satisfies such market needs.
The WT3000E offers two types of input elements. The low-current element provides selectable input ranges of 5, 10, 20, 50, 100, 200, and 500 mA and 1 and 2 A. The high-current element provides selectable ranges of 0.5, 1, 2, 5, 10, 20, and 30 A. Both offer eight selectable voltage ranges from 15 to 1000 V. One to four input elements can be installed with any combination of low- and high-current versions. Measurements of crest factors of up to 300 are possible. The measurement frequency range is from DC and 0.1 Hz to 1 MHz.
Many of today’s power conversion circuits use energy saving switching techniques. These can cause highly distorted voltage or current waveforms with high harmonic content. To measure these waveforms accurately, the WT3000E uses high-resolution 16-bit analog to digital converters, which will benefit the design and test engineer in product performance evaluation and for power-quality conformance testing. The normal power parameters and harmonic data are measured simultaneously, providing for faster and more accurate power analysis.
Two new measurement functions are provided as standard with the WT3000E. The delta calculation function allows users to calculate the individual phase voltages, line-to-neutral, from the line-to-line voltages measured in a three-phase three-wire system. This function can be beneficial to the engineer in applications such as motor testing and others where there are no neutral lines. The cycle by cycle measurement function enables users to list the measurement parameters of voltage, current, and active power for each cycle in a time series. This is a unique method to capture the fluctuating transient power with high precision.
For electric motor testing applications, the WT3000E offers a unique motor evaluation function. In one unit, you can measure all the electrical power parameters along with rotation speed, torque, mechanical power, synchronous speed, slip, motor efficiency, and total system efficiency.
For IEC standards compliance testing, the WT3000E provides harmonic measurement in accordance with the latest IEC61000-3-2 and IEC61000-4-7 standards. Voltage fluctuation and flicker measurements can be made in accordance with the latest IEC61000-3-3 and IEC61000-4-15 standards. The Yokogawa harmonic and flicker software, 761922, used with the WT3000E, provides a complete compliance measurement test system per the IEC standards.
The instrument includes a high-resolution 8.4-inch TFT LCD, making it simple to set up and display up to nine different pages of measurement items in numerical formats as well as waveforms, harmonic-spectrum bar graphs, and trends. In addition, a vector display is available for voltage and current phase analysis.
All the latest communication interface ports such as Ethernet, USB, and GPIB, as well as RS-232, are available in the WT3000E. Support for USB removable storage media is also available.
