WT3000E Precision Power Analyzer

High-end Power Meter (up to 4 elements, Range: 2A or 30A)
Basic Power Accuracy: 0.01% of reading, DC and 0.1 Hz-1 MHz bandwidths, the WT3000E provides higher-accuracy measurement of I/O efficiency.

WT3000E Digital Power Analyzer— Watch the WT3000E Video —


  • Basic power accuracy: 0.01% of reading, DC and 0.1 Hz-1 MHz bandwidths
  • up to 4 elements
    Basic Power Accuracy: ±(0.01% of reading + 0.03% of range)
    30 A and 2 A input element can be installed together
  • Good readability: The large, 8.4-inch LCD and the range indicator LEDs
  • Simultaneous measurement with 2 units (8 power input elements)
  • Voltage Range: 15-1000V
  • Current Range: 0.5-30A ; 5mA – 2A
  • 50 ms Data Storing Interval
  • Precision compensation functions
    ( Wiring, Efficiency and Two-Wattmeter Method Compensation )
  • Cycle by cycle trend analysis
  • Three phase delta calculation
  • 50 ms Data Storing Interval
IIII [+] Options and Applications


  • Motor evaluation function (/MTR option)
  • Advanced waveform analysis (/G6 option)
    • Harmonic measurement in normal measurement mode
    • Wide bandwidth harmonic measurement
  • Added Frequency Measurement (/FQ Optional)
  • D/A Output (/DA Optional)
  • Built-in Printer (/B5 Optional)
  • RGB Video Signal (VGA) Output Section (/V1 Optional)
  • Advanced Calculation (/G6 optional)
  • Ethernet Communications (/C7 Optional)
  • Serial (RS-232) Interface (/C2 Optional)
  • USB port (PC) (/C12 Optional)
  • USB port (Peripheral) (/C5 Optional)


  • Accurate inverter/motor evaluation
    • Simultaneous input and output measurement
    • Accurate measurement of fundamental PWM voltage
    • Phase voltage measurement without a neutral line (Delta calculation)
    • High frequency and harmonic measurements (/G6 option)
    • Evaluation of torque speed characteristics
      (/MTR option, cycle by cycle measurement)
    • Power conversion technologies similar to those used in
      Electric Vehicles (EVs) and power conditioners
  • Harmonic and Voltage Fluctuation/ Flicker Measurement
  • AC Magnetic material characteristics Testing
  • Power calibration
  • Semiconductor testing
  • Evaluation of high frequency lighting devices


The WT3000E is Yokogawa’s highest precision Power Analyzer has a power measurement accuracy of 0.01% of reading + 0.03% of range and innovative measurement functions. This cutting-edge Power Analyzer is ideal for measuring and testing product efficiency, inverters, motor drives, lighting systems, uninterruptible power supplies, transformers, aircraft power systems, and other power conversion devices.

The WT3000E is available with high or low range input elements.  The Low Current Element provides selectable input ranges of 5mA to 2 Amps while the High Current Element provides selectable ranges between 0.5 and 30 Amps.  Both offer eight selectable voltage ranges from 15 to 1000 Volts. From 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.  This is very important in dealing with power electronic circuits.  The measurement frequency range is from DC and 0.1Hz to 1MHz.

IIII [+] Read More

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, sixteen-bit Analog-to-Digital converters.  This will benefit the design and test engineer in product performance evaluation and in power quality conformance testing.  The normal power parameters and harmonic data are measured simultaneously providing for faster and more accurate power analysis.

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 used to capture the fluctuating transient power with high precision.

For Electric Motor testing applications, the WT3000E offers a unique and powerful 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.

With its large high resolution 8.4 inch TFT LCD display, it is simple to set up and display up to nine different pages of measurement items in formats such as Numeric, Waveforms, Harmonic Spectrum Bar Graphs and Trends.  In addition a Vector display is available for Voltage and Current Phase Analysis.
All common interface ports such as Ethernet, USB and GPIB, as well as RS232 are available in the WT3000E.  In addition, support for USB removable storage media is available.
  • Literature
  • Specifications
  • Options
  • Options Ctn’d
  • Software
Model: Yokogawa WT3000E Power Analyzer
  WT3001E WT3002E WT3003E WT3004E
Number of elements 1 input elements 2 input elements 3 input elements 4 input elements
  Available with 2A or 30A input elements
Basic power accuracy: ±(0.01% of reading + 0.03% of range)
DC power accuracy 0.05% of reading +0.1% of range
Power frequency range: DC, 0.1 Hz to 1 MHz
V / A frequency range: 1 MHz
Sampling Speed: approximately 200 kS/s
Accuracy range – V / A: 1% to 130%
Plug-in inputs Crest Factor: Maximum 300
Input type Floating input
Resistive voltage divider Direct input: Shunt input External
input: Resistive voltage divider
(for crest factor 3) 15 V, 30 V, 60 V, 100 V, 150 V, 300 V, 600 V, 1000 V
(for crest factor 6) 7.5 V, 15 V, 30 V, 50 V, 75 V, 150 V, 300 V, 500 V
Direct Input: Current
2 A input element  
(for crest factor 3) 5mA, 10mA, 20mA, 50mA, 100mA, 200mA, 500mA, 1A, 2A
(for crest factor 6) 2.5mA, 5mA, 10mA, 25mA, 50mA, 100mA, 250mA, 500mA
30 A input element  
(for crest factor 3) 500 mA, 1 A, 2 A, 5 A, 10 A, 20 A, and 30 A
(for crest factor 6) 250 mA, 500 mA,1 A, 2.5 A, 5 A, 10 A, and 15 A
External Input: Current Sensor
(for crest factor 3) 50 mV, 100 mV, 200 mV, 500 mV, 1 V, 2 V, 5 V, and 10 V
(for crest factor 6) 25 mV, 50 mV, 100 mV, 250 mV, 500 mV, 1 V, 2.5 V, and 5 V
A/D converter Simultaneous voltage and current conversion and 16-bit resolution. Conversion speed (sampling rate): Approximately 5 μs.
Data Update  
Rate: 50 m, 100 m, 200 m, 500 m, 1, 2, 5, 10, 20 [sec]
Measurement Parameters
Main: Voltage, current, active power, reactive power, apparent power, power factor, phase angle, frequency, peak voltage, peak current,crest factor, integration (Wh, Ah, varh, Vah)

MAX hold
Voltage RMS/MEAN simultaneous measurement
Average active power (user defined function)
Active power integration (WP) (Wh)
Apparent power integration (WS) (VAh)
Reactive power integration (WQ) (varh)
min / max. display

Motor evaluation Torque, A / B / Z phase signal inputs (/MTR),4 inputs, & motor evaluation (opt
Delta Calculation Voltage (V) difference, 3P3W ⇒ 3V3A, DELTA ⇒ STAR, STAR ⇒ DELTA
Current (A) difference, 3P3W ⇒ 3V3A, DELTA ⇒ STAR, STAR ⇒ DELTA
Power (W) DELTA ⇒ STAR
FFT Number of points 20,000 points or 200,000 points
Window functions Rectangular, Hanning, or Flattop
Measured parameters Voltage, current, active power, and reactive power of each input element.
Active power and reactive power of an Σ wiring unit.
Torque and speed signals (analog input) of motor input
Type PS (power spectrum)
Harmonic Measurement in Normal Measurement Format PLL synchronization method
Frequency range Range in which the fundamental frequency of the PLL source is 10 Hz to 2600 Hz
Measured parameters Voltage, current, active power, and reactive power of each input element.
Active power and reactive power of an Σ wiring unit.
Torque and speed signals (analog input) of motor input
Type PS (power spectrum
Window functions Rectangular
FFT data length 9000 with 32 bits processing word length
Cycle-by-cycle measurement Synch source Select an external source of U1, I1, U2, I2, U3, I3, U4, or I4
parameters are measured continuously for each cycle of the one sync source signal
No. of meas. 10-3000
Synch source frequency range 1 Hz to 1000 Hz (for U and I)
0.1 Hz to 1000Hz (for external sync source)
Accuracy U, I, P: Add [(0.3+2*f) % of rdg + ((0.05+0.05*f) % of range] Add [(0.3+2*f)% of reading to accuracy
Voltage Fluctuation/Flicker Measurement Type: Normal Flicker Measurement Mode
Measurement of dmax Caused by Manual Switching Mode
Items Common to Measurement Modes
Number of measurements dc Relative steady-state voltage change
dmax Maximum relative voltage change
d(t) The time during which the relative voltage change during a voltage fluctuation period exceeds the threshold level
Pst Short-term flicker value
Plt Long-term flicker value
Synch source frequency range

1 Hz to 1000 Hz (for U and I) 0.1 Hz to 1000Hz

Accuracy U, I, P: Add [(0.3+2*f) % of rdg + ((0.05+0.05*f) % of range] Add [(0.3+2*f)% of reading to accuracy
Display: 8.4-inch color TFT LCD monitor
Waveform Display
Numerical: Select 4, 8, 16, all, single list, or dual list, display res: 600000
Bar: Displays the size of each harmonic in a bar graph
Vector: Vector display of the phase difference in the fundamental waves of voltage and current. (without Single Input Element model)
Simultaneous display: Two windows can be selected (from numerical display, waveform display, bar graph display, or trend display) and displayed in the upper and lower parts of the screen
Trend display: Number of measurement channels Up to 16 parameters
Displays trends (transitions) in numerical data of the measurement functions in a sequential line graph.
Built-in Printer (/B5 Option)
Print type: Thermal line/dot matrix - 8dot/mm, 112 mm [Effective print width: 104 mm]
Power supply: 100 to 120VAC/220 to 240VAC (automatic switching) — 50/60Hz
Power consumption: Max 150 VA (when using printer)
Operating Temperature: 5 to 40°C, 20 to 85% RH
Dimensions: Approximately 452 (W) x 197 (H) x 497 (D) mm (including 253710 printer cover; does not include knobs and projections)
Weight: Approx. 15 kg (main unit with four power modules installed)

The Advanced Calculation Function (/G6 option) provides for wide bandwidth harmonic measurement, IEC compliant harmonic measurement (requires harmonic measurement software), FFT calculation, waveform calculation functions, and saving of waveform sampling data.

Advanced Calculation Function (/G6 option)

Wide Bandwidth Harmonic Measurement Mode
Harmonic measurement for a frequency range of 0.1 Hz – 2.6 kHz

Enables harmonic measurement over wide bandwidths. Supports measure-ment of harmonic signals beyond those of the harmonic measurement func-tion in normal measurement mode. This option allows for harmonic analysis on waveforms with a fundamental frequency range of 0.1 Hz–2.6 kHz (*1). You can measure up to the 50th order harmonic at 1 kHz fundamental.(*2).
*1 0.1–10 Hz using an external sampling clock.
*2 Harmonic measurement of up to the 20th order possible in the 1 kHz to 2.6 kHz range.

Harmonic Measurement Function
Harmonic and normal power parameters measurement at same time

This function enables simultaneous measurement of normal and harmonic data, which was impossible with previous Yokogawa models. Since with the WT3000E you can simultaneously confirm total voltage and current as well as the distortion factor and fundamental wave without switching modes, this allows for more accurate and efficient measurement of the power supply quality, the fundamental wave of motor drive voltage, and other factors.

IEC Harmonic Measurement Mode
Can perform tests conforming to international standards.

The IEC harmonic measurement mode meets the window width requirement of the latest IEC harmonic standard (10 cycles of 50 Hz and 12 cycles of 60 Hz). Also, this mode allows users to use the 761922 harmonic measurement software to perform tests conforming to IEC 61000-3-2 and IEC61000-3-12.
* These modes cannot be used at the same time.

FFT Calculation Mode
More detailed frequency analysis than with the harmonic measurement mode.

Two FFT calculations can be performed simultaneously on waveform data of measured voltage and current. You can select a resolution for FFT of 1 Hz or 10 Hz. FFT analysis of up to 100 kHz can be performed.

Waveform Calculation Mode
Monitoring of instantaneous power waveforms.

Up to two waveform calculations and other Waveform Calculation functions can be used at once. If you create a formula that multiplies voltage and current waveforms, you can confirm an instantaneous power waveform on screen. Waveform Calculation data can be saved in CSV or WVF format.

Waveform Sampling Data Saving Function
Saving of detailed waveform data for confirmation.

All captured voltage and current waveform data (200 kS/s), calculated wave-forms, and FFT calculated waveforms can be saved. You can choose to save in CSV or WVF format, and to save to PC card or USB memory (/C5 option).

Motor Evaluation Option (/MTR)

  • Calculation of motor and total efficiency
    In addition to the functions of the standard version, the new models offer powerful motor/inverter evaluation functions
    Voltage, current, and power measurement with torque and speed input
  • Measures torque meter and speed sensor output (analog or pulse output), and allows calculation of torque, revolution speed, mechanical power, synchronous speed, slip, motor efficiency, and total efficiency in a single unit.

Added Frequency Measurement (/FQ)

Checking the frequencies of all inputs
In addition to the standard two channels of frequency measurement, a six-channel frequency measurement option is also available. This option provides frequency measurement of voltage and current on all eight channels (with input elements 1 through 4 installed). This is necessary when you want to measure voltage and current frequency from the instrument’s I/O as well as voltage and current frequencies of multiple items under test at the same time.

D/A Output (/DA)

Outputting measurement values as analog signals to other devices

  • 20 channels
    Measured valuescan be output as ±5V 5V FS DC voltages from the D/A output connector on the rear panel. Measured parameters can be output on up to twenty channels simultaneously. Even with four input elements installed, you can send up to five types of data per element to D/A output.
  • D/A zoom
    Normally the D/A output function outputs DC voltage scaled to a range of -5V to 5V* with respect to the measurement range. For this reason, it may not be possible to observe fluctuations in a nearly constant signal if the D/A output is set to go to ±5V at the measurement range rated value. One case in which this could happen is when a 100V measurement voltage fluctuates in the range of ±3V.
    The WT3000E has a D/A zoom function to solve such problems. This function allows the any input signal range to be scaled to between -5V and 5V* in the D/A output as Upper and Lower ranges. This makes it possible to enlarge input signal fluctuations for observation using a recorder or logger.
    * The range is 0V to 5V for some functions, such as frequency measurement

Built-in printer(/B5)

  • Output graphics at the touch of a button
    The optional built-in printer is installed on the front side of the WT3000E, so it is easy to use even if the WT3000E is mounted on a rack. The printer can be used to print data and waveform memos. Wt3printer
  • Auto Print Function
    The Auto Print function allows you to set a time interval at which measured values are automatically printed on the built-in printer. You can also set a start and stop time in order to record data over a desired time period. You can also specify to print only the desired measured items.

Flicker measurement (/FL)

Video output for viewing on a larger screen

The option conforms to 100BASE-TX and 10BASE-T and provides for data exchange via communications. The option supports file transfers via FTP server, as well as FTP client (network drives), LPR client (network printers), and e-mail (SMTP client) functions.
* The WT3000E does not have a built-in hard disk. The FTP server function is available when a PC card or USB memory is inserted or connected to the PC.

VGA output (/V1)

Video output for viewing on a larger screen

The VGA port can be used to connect an external monitor in order to view numerical value data and waveforms on a larger screen. This capability is useful if you want to simultaneously check large amounts of data on a separate screen, or view data in a separate location.

WTVIEWER – harmonic Analysis software for WT3000E Series

The measurement procedures and settings for harmonic/flicker standards testing have been precisely defined. Engineers must also stay current with the specialized knowledge and up-to-date information required to periodically review the contents of the standards and perform the standards conformance tests. The model 761922 Harmonic/Flicker Measurement Software enables engineers without specialized knowledge to perform a range of operations using the WT3000E Precision Power Analyzer including judging standards compliance and outputting test reports.

  • Harmonics EN61000-3-2 / IEC61000-3-2
    Limits for harmonic current emissions of the latest Edition
    (Equipment i rated current of 16 A per phase or less)
    EN61000-3-12 / IEC61000-3-12
    Limits for harmonic current emissions
    (Equipment rated current is of 75 A per phase or less, and more than 16 A per phase)
  • Voltage fluctuation/flicker EN61000-3-3 / IEC61000-3-3
    Limitation of voltage fluctuations and flicker
    (Equipment rated current of 16 A per phase or less, and not subject to conditional)
    EN61000-3-11 / IEC61000-3-11
    Limitation of voltage fluctuations and flicker supply systems
    (Equipment rated current of 75 A or less, and subject to conditional)
  • IEC61000-4-7 1991(window widths of 16 cycles), IEC61000-4-7 2002(Harmonic and interharmonic measurement supporting window widths of 50 Hz/60 Hz, 10/12 cycles)
  • Viewing Trends You can capture various types of data measured into your PC at 200ms fixed intervals. Thus, you can view trends graphically. This feature lets you monitor power supply voltage fluctuations, changes in current consumption and other time-based variations.
  • Harmonic Current Measurement Value List Displays harmonic measurement data as a single list.
  • Harmonic Current Bar Graph Evaluates whether harmonic data is within the standard limit value, and displays the result as a bar graph. The display of evaluation results is color-coded, in colors such as red and blue.
  • Measurement Value Judgement Graph Measures the harmonic current over the set observation time, and evaluates it in conformance with the standard. Evaluation results are displayed as PASS or FAIL
  • Waveform Observation Lets you display voltage or current signal waveforms, and measure frequencies and peak values. Moving the cursor lets you display values for the displayed waveform.
  • Automatic Report Generation You can print harmonic measurement results as value lists and graphs, and save image data. Titles and comments can be entered in reports, letting you enter information such as measurement dates/times, device names or control numbers.

Power Consumption Measuring Software

  • Power Consumption Measuring Software
    A comprehensive solution – standby power consumption measurement software.

  • Meets the Requirements of IEC62301 Ed2.0(2011) Household electrical appliances – Measurement of standby power and EN 50564:2011 Electrical and electronic household and office equipment – Measurement of low power consumption.
  • New standby power consumption measurement software that conforms with the testing methods specified in the IEC62301 Ed2.0(2011) standard and EN 50564:2011 has been introduced for the Yokogawa range of digital power analyzers.
  • Allows the user to perform measurements according to IEC62301 Ed2.0(2011): Household electrical appliances – measurement of standby power and EN 50564:2011 – Electrical and electronic household and office equipment – Measurement of low power consumption.
  • The software sets up the appropriate test conditions by 3 type measuring mode(Ed1.0/Ed2.0(auto)/Ed2.0(manual), measures the power values, and creates a test report based on the requirements of the IEC62301 Ed2.0(2011) and EN 50564:2011 standards. Key parameters measured and incorporated in the test report include total harmonic distortion(THD measurement), crest factor, RMS voltage, frequency, measurement period and power.