Precision Power Analyzer WT3000 (DISCONTINUED)

Notice: This product was discontinued on Mar 1, 2016. See this replacement product:

The WT3000 is the ideal measurement solution for applications such as product efficiency testing, engineering, R&D work on inverters, motor drives, lighting systems and electronic ballasts, UPS systems, aircraft power systems, transformer testing and other power conversion devices.

June 29, 2015

  • Released firmware Version 6.11


With basic power accuracy of ±0.02% reading, DC and 0.1 Hz-1 MHz measurement bandwidths, and up to four input elements, the WT3000 provides higher-accuracy measurement of I/O efficiency.

  • Basic power accuracy: 0.02% of reading
  • 2A current input element
  • Good readability: The large, 8.4-inch LCD and the range indicator LEDs
  • Simultaneous measurement with 2 units (8 power input elements)
  • Store function: 50 ms data storing interval
  • Interface: GP-IB, Ethernet, RS-232 and USB
  • Advanced computation function: Waveform computation, FFT analysis, waveform sampling data saving.
  • IEC61000-3-2 and IEC61000-3-12: Harmonic measurement
  • IEC61000-3-3 and IEC61000-3-11: Voltage fluctuation / flicker measurement
  • IEC61000-4-15 Ed2.0 (Support Flicker meter standard)

More Precise. More Bandwidth. More Features.

  • The WT3000 is a truly innovative measurement solution, combining top-level measurement accuracy with special functions.*
  • The large, 8.4-inch liquid crystal display and the range indicator LEDs ensure good readability and make the system easy to use.

*As compared to Yokogawas WT2000

Have you had problems or questions such as these?

  • When working with efficiency-improvement evaluation data for a high-efficiency motor, improvements cannot be seen unless measurements are taken with very high precision.
  • Measurement efficiency is poor during power measurements and power supply quality measurements.
  • You measure voltage using mean values out of habit, and are wondering if that is really the best approach.
*For answers to these questions, see applications page.

Better Efficiency in Power Measurements

In developing the WT3000, Yokogawa focused on improving efficiency in two basic areas. One goal was to obtain highly precise and simultaneously measurements of the power conversion efficiency of a piece of equipment. The other objective was to improve equipment evaluation efficiency by making simultaneous power evaluations and tests easier and faster.

New Innovations to Enhance the Reliable Measurement Technology;

The Yokogawa WT2000 was very popular with users and considered highly reliable because of its high precision and excellent stability. The WT3000 is based on a measurement system which combines the measurement technology used in the WT2000 as well as other WT Series models. With the WT3000, we made further improvements to the basic performance specifications for even better functionality and reliability. We are confident users will appreciate these improvements to power and efficiency measurements thanks to the new power control technologies we have introduced.

A Variety of External Interface Choices


The WT3000 is the first model in the WT Series which is standard- equipped with a PC card slot (ATA flash card slot). This interface allows data to be saved quickly, so data processing time is reduced. The WT3000 is also standard-equipped with a GP-IB port. In addition, a serial (RS-232) port, Ethernet port, and USB port are available as options. The variety of interface choices allows customers to use the best interfaces for a wide variety of equipment, media, and network environments.




Yokogawa's highest-precision power analyzer *1

The WT3000 has the highest precision of all the Yokogawa power analyzers in the WT series. The models in the WT series are designed to meet a wide variety of user needs. The WT300 series is a high price-performance series which is very popular in production line applications. The WT1800 allows measurement data to be viewed in a variety of ways, including numerical value display, waveform display, and trend display capabilities.

WTFamily 2

*1 As compared to Yokogawa's products
*2 Reading error

WT3000 controls: simple to use, easy to view

Range settings using direct key input

Intuitive control using cursor keys

Using item pages to set display preferences

A Variety of display formats

50ms data updating intervals

Compensation functions

User-defined function

Efficiency calculation function

A Variety of integration functions

Advanced Calculation Function (/G6 option)

Delta Calculation (/DT)

Added Frequency Measurement (/FQ)

D/A Output (/DA)

Built-in printer(/B5)

VGA output (/V1)

Serial (RS-232) (/C2)

USB Port for Peripherals (/C5 Option)

USB Port for Connection to PC (/C12 Option)

Ethernet Communication Function (/C7 Option)

Cycle-by-cycle function (/CC)

Flicker measurement (/FL)

Model Description
760301 WT3000 1 input element model
760302 WT3000 2 input element model
760303 WT3000 3 input element model
760304 WT3000 4 input element model

B9284LK External Sensor Cable

For connection the external input of the WT3000 to the current sensor.
Length: 50cm

366924 BNC to BNC 1m Cable

  • 366924 BNC to BNC cable for oscilloscope 
  • 1m BNC wire
  • Simultaneous measurement with 2 units
  • Input external trigger signal

366925 BNC to BNC 2m Cable

BNC-BNC 2m. For connection to simultaneously measurement with 2 units, or for input external trigger signal.

B9316FX Printer Paper Roll

Printer Paper Roll
Thermal paper (10m) for WT1600, WT 1800, WT3000, & WT3000E - 1 roll

758917 DMM Measurement Lead Set

  • Set of 0.8m long red and black multimeter test leads
  • Used in combination with a pair of optional 758922 or 758929 alligator-clip adapters
  • 1000 Vrms, 32 Arms CAT II

758921 Fork terminal adapter

  • 758921 Fork Terminal Adapters
  • For fitting a 4mm banana plug to a fork terminal
  • One black and one red clip
  • 1000 Vrms-CAT II

758922 Small Alligator-Clip Adapter 300V

Rated at 300 V. Attaches to the 758917 test leads. Sold in pairs.

758923 Spring Hold Safety Terminal Adapter Set

Two adapters in a set (spring-hold type).

758924 BNC to Banana Conversion Adapter

For conversion between BNC and female banana plug
Applicable for DL750/DL750P, SL1000 & SL1400.

758929 Large Alligator Clip Adapter 1000V

  • Yokogawa 758929 Alligator Clip Adapter 
  • Rated at 1000V
  • Attaches to 758917 test leads
  • Sold in pairs black/red

Deluxe Instrument Cart 701961

Deluxe instrument cart with adjustable shelf positioning.

Compact Instrument Cart 701960

Compact instrument cart
500 mm (W) x 560 mm (D) x 705 mm (H)
/A option: keyboard, mouse table
/B option: comes with a 3-prong power strip

All-Purpose Instrument Cart 701962

All-purpose rolling instrument cart.

751535-E4 Rack mounting kit

RACK MOUNTING KIT For an EIA-compliant Single-housing Rack

751535-J4 Rack mounting kit

RACK MOUNTING KIT For an JIS-compliant Single-housing Rack


Measurement of Power Consumption in Mobile Phones 


High Accuracy Measurements of Transformers


With increased focus on reducing energy consumption and compliance with efficiency standards, this app note provides an overview on the types of measurements needed for efficiency and power quality, and the instruments that take them.


Energy consumption in low-power and standby modes is an important issue due to increased awareness that energy resources are becoming limited and demand for energy-saving household electrical appliances continues to grow. IEC62301 Ed2.0 (2011) and EN 50564:2011 define standby mode as the lowest energy consumption of an appliance not performing its main function, when connected to the mains. IEC62301 Ed2.0 (2011) defines test methods and requirements for both the mains supply and the test equipment. It is crucial that design and test engineers choose highly accurate power measurement tools to confirm that their devices meet these requirements.


Designing an instrumentation system for high current measurement requires careful consideration of the trade-offs associated with each type of sensing device. The purpose of this application note is to help engineers understand the sensing choices available and the corresponding trade-offs with each technology.


The objective of this paper is to show the close relationship between efficiency and power quality, and provide education on the causes of power quality, types of power quality issues, and provide guidance on measurement considerations.

"Error(Code:846): Attempted to start integration while measurement of peak overflow was in progress"The following error code will appear if Peak Over has occurred and you attempt to start integration. The WT3000 has two ...
  • WTViewer Save Setting feature will only save WTViewer setting information
  • Will NOT save the setting information of the instrument

The AC Power Input in all Yokogawa instruments is designed as a 3-pin connection (one of which is a GND pin). In some parts of the world, PCs are sold with AC power cables that are 2-pin. Often times this means the ...

It is not necessary to specify the accuracy for PST values outside the range of 1.0, as any value larger than 1.0 is non-standard. The standard (IEC 61000-3-3) requires that the value of the short-term light ...

The circuit design for the line filters used on the WT & PZ series instruments are similar to Butterworth filters but have been redesigned. We redesigned the original filtering characteristic to obtain a ...

There are no built-in over temperature protection devices in the WT3000. The official operating range covered by warranty is listed at 5°C - 40°C. Our own internal test have revealed that it is possible to ...
  • WT1800 High Performance Power Analyzer, WT500 STORE functions can only be used to record NUMERIC data   
  • WT1600, WT3000 STORE functions can be used to record both NUMERIC and WAVEFORM data
  • Current Knobs and Pads (Studder) Used on the Direct Input Terminals of the WT500 Part Numbers
  • A9105ZG: Black Current Knob Set of 2 B9292GX: Pad (Studder) Set of 10
For the WT1600, to view the harmonic data in the Bar Graph window of WTViewer, you have to select all the harmonic orders in the Numeric window. WTViewer's Bar Graph window display follows the harmonic items activated ...

Although WTViewer is not officially supported under the Linux environment, users have successfully done so using WINE (flavor of Linux) via RS232. For connectivity to WT210/WT230, WTViewer requires that the meter be set ...


To use the WT3000 with the Flicker Software, the WT3000 Precision Power Analyzer must have the following options: /G6 option - Advanced Calculations /FL option - Flicker Measurements 1 to 3 elements - 30A Input Module Note: The 2A input ...


The following product tutorial guides have been created for the WT and PZ Series Power Meter and Analyzer instruments and are available for download. Each tutorial contains quick and easy steps to help you get started ...

Output function: HArWhen the default output item is set to 1, the printout time for up to the 50th order is about 116 seconds. The printout time for up to the 25th order is about 75 seconds. Output function: HArWhen the ...
The output resolution for the WT3000 is 16-bits.
When the selected data update cycle of the fundamental wave is shorter than the width of the analysis window determined by the fundamental frequency (cycle of the fundamental wave), measurement is not performed and no ...

Selecting formulas for calculating apparent power and reactive powerThere are several types of power—active power, reactive power, and apparent power. Generally, the following equations are satisfied:Active power P = ...


The waveform may actually not be a pure sine wave. Even though a 50/60 Hz sine wave is expected, the following factors may be involved: The waveform is slightly distorted (harmonic components are mixed in) Small ...

  • Check the "Sync Source" and zero cross filter (frequency filter) settings.
  • For the WT3000, "Sync Source" setting is irrelevant if the data update rate is 250 ms, 500 ms, 1 s, or 2 s.

Check for differences in the specifications or features of the instruments. For values that do not match when inputting a 50/60 sine wave Check whether the value is within the specifications (error) of each power ...


The measurement intervals of the measured I/O data must overlap exactly. Check the sync source setting. For example, route the input to a three-phase device under measurement to input elements 1-3 on the power meter, ...


Check for differences in the specifications or features of the instruments. For values that do not match when inputting a 50/60 sine wave Check whether the value is within the specifications (error) of each power ...

  • Power Analyzer/Power Meter 
  • In the case of three-wire, or 3V3A wiring, or three phase power source, they do not match because it is the line to line voltage that is measured
In the three-phase three-wire, or 3V3A wiring scheme, the phase angle of voltage between each input element is 60 degrees because it is the line to line voltage that is measured. Please download and refer to the ...

In the three-phase three-wire, or 3V3A wiring scheme, the phase angle of voltage and current input to each input differs from that of the actual load because it is the line to line voltage that is measured.  In ...

This is due to measurement and calculation error, or differences in calculation methods.   On the WT, the three-phase apparent power (ΣS) equation is calculated under the assumption of a balanced condition (the ...
When measuring input signals of distorted waves, signals that are DC-offset or signals that include superimposed harmonic components, will result in different values for power factor and phase angle than those expected ...

The peak value and crest factor may be unstable if they have not been captured accurately. If the peak value is not stable, neither will the crest factor be stable. The cause is the difficulty in capturing the narrow ...


The difference in measurement values can be attributed to the difference in calculation methods for normal mode and harmonic mode.   The voltage, current, and power in normal mode are displayed as the total of the ...

This could be caused by any of the following: Is there any crosstalk (especially around the 2nd order)? Are there any effects of CMRR (especially around the 2nd order)? Is the location of measurement immediately next ...

The following may be causing the problem. 5V may have occurred during rating. Check the range setting again. DA output error can affect the values when the input is smaller than the rating. Have you checked the error ...


Check the Synch Source and Frequency Filter settings When a single-phase signal being measured fluctuates around power factor of 1.Slight fluctuations in the measured values of voltage, current, and power can cause a ...

The input terminals on all Yokogawa power meteras are located on the rear panel. This takes into account safety when handling the measuring instrument.    The signal input to the power meter normally carries high ...
  • Power analyzers/power meters
  • Binding posts on the direct current input terminals
  • Prevent an open current circuit and safety hazards
There are restrictions of the DSP hardware.   WT230 and WT210 are low-cost power meters. So, a low-cost, modest performance DSP utilized.This DSP has slow calculation.   WT3000 is performing complicated ...
What is the maximum size of ATA Flash Card we can use with the WT3000?   The maximum size of the card to save data is 16GByte. The maximum size of the card used for firmware updating procss is limited to 256MByte.(A ...
The WT3000 enables users to save the waveform data via two methods: waveform displayed data, and waveform sampled data. The number of data points saved  by the waveform displayed data method is compressed to a total ...

When the WT1600 Digital Power Analyzer is set into Integration mode, the averaged power (watt) values can be calculated and displayed. This is available only by using the User-Defined Function feature found in the MEASURE button menu.  The ...

The WT1800 and WT3000 series digital power analyzer offer two calculation methods, Type1 and Type3, for apparent and reactive power.  Type1:The WT will first calculate the RMS voltage Urms, current Irms, and active ...

 You can not use LabVIEW and WTviewer to communicate with the PC using same USB driver. The USB driver for LabVIEW and the USB driver for WTviewer is different. Yokogawa's YKMUSB driver is used by WTviewer ...

There are several items you will need to check and verify to solve this issue. Verify the GP-IB connectionSome instruments have a D/A output connector located next to the GP-IB connector. There have been some ...
Unfortunately the WT3000 cannot display the RMS and DC values of voltage/current at the same time, even if you use the user-defined function feature. You must select either RMS or DC mode in the Voltage/Current Range ...

The IEC Harmonic analysis on the DL/DLM series oscilloscopes provides a rough analysis and estimation for harmonic testing. The scope will perform an FFT on the current waveform and can be used to measure the general ...

Please verify the following settings on the WT3000: Wiring System set to 3P3W or 3V3A ITEM set to φUi-Uj Element set to ΣA ITEM set to φUi-UkWiring 3P4W or 3P3W(3V3A)Assign element 1,2, 3 to ΣA Update rate is not too fast (

The value depends on the model of the power analyzer. For Precision Power Analyzer WT1000, WT2000, WT100, and WT200, it is fixed to the fundamental wave. For power analyzers with 7 segments LED, the relative harmonic content is fixed to the ...


The Precision Power Analyzer WT3000  D/A output terminal is electrically isolated from the case. For all other models, the D/A output terminal is connected to the case.


This training module covers the following topics:

  • Introduction & Installation
  • Connecting to Instrument
  • Setup, Measure, and Analyze
  • File Operations: Saving and Loading Data
  • Video Demonstrations

For standby power measurement and energy certification maintenance, we rely on Yokogawa Test&Measurement instruments. Their precision, accuracy, and ease-of-use are unrivaled. When given a choice between other test and measurement equipment and Yokogawa, our technicians always go for Yokogawa first. The support team provides thoughtful insights based not just on our industry but also our company’s specific needs. My team has used Yokogawa Test&Measurement instruments for decades and will continue to do so well into the future.

—Director of Technology Laboratories, International Multi-Brand Manufacturer of Major Home Appliances

Product Overviews



    While DC power measurements are relatively straight forward, AC power measurements that include distorted waveforms, varying power factors, and multiple phases can add complexity to an otherwise simple measurement. During this webinar, we cover multiple fundamentals of power measurement.

    Key topics include:

    • Multi-phase measurements
    • Measurement techniques
    • Measurement applications
    • Real-world examples and more

    Why should you be concerned with your product’s power system voltage and current harmonics? From an engineering perspective, harmonics produce excessive heat in equipment that causes significant damage and results in inefficient operation. From a business perspective, compliance is an absolute requirement for entry into global markets. To minimize or eliminate these issues and establish acceptable levels of harmonics, numerous power quality standards with specifications and limits for harmonic distortion, such as IEEE 519-2014 and IEC61000-3-2, have been introduced. During this webinar, attendees will gain knowledge on the inner workings of harmonics, learn best practices for accurately measuring harmonics, learn to recognize and distinguish the critical difference between DFT and FFT, and discover important measurement tradeoffs across various test equipment.


    You know the basics of electrical power measurements, have set up your dyno, and made key measurements – which is great. But as your motor and drive projects progress, the complexities of system drive requirements can change frequently. Control algorithms, networked communications, and mechanical systems form a complex web of interactions that need sorting. This 60-minute webinar explains how to get past ground-level measurements and delve into comprehensive solutions that leverage test and measurement instruments including power analyzers, high-speed data acquisition, and real-time software.

    Topics include:

    • How to avoid the “gotcha's” of inverter-based measurements
    • Computations for field-oriented control
    • The integration of CAN bus communications
    • Correlations in the frequency domain
    • Other advanced motor and drive topics

    The technical presentation includes an audience Q&A.

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