Yokogawa PX8000 Precision Power Scope


    Traditional power measurement instruments cannot provide accurate time measurements; oscilloscopes are not designed to measure power. The PX8000 is the world's first precision power scope, bringing oscilloscope-style time-based measurement to the world of power measurement. It can capture voltage and current waveforms precisely, opening up applications and solutions for a huge variety of emerging power measurement problems. 

    The PX8000 has a number of innovative features that support the crucial measurement and analysis of transient power profiles. 

    Simultaneous power calculation

    Provides simultaneous voltage and current multiplication to give real-time power sampling.

    Cycle-by-cycle power trend measurement

    Trend measurements between waveforms can be calculated by mathematical functions (up to four million points). 

    Specific time-period measurement New

    Supports the capture of power parameters over specific periods of time through the definition of start and stop "cursors". 

    Specified time-period waveform measurement

    Supports the capture of waveform parameters over specific periods of time through the definition of start and stop "cursors".

    X-Y display and phase analysis

    Supports X-Y axis displays as standard. It can also display lissajous waveforms of input and output for phase analysis.

    Capturing sudden or irregular phenomena

    An always-active History function automatically records up to 1,000 historical waveforms. 

    Long-period data capture and analysis

    An accompanying PC application called PowerViewerPlus can be used to capture waveform data for further analysis. 

    FFT analysis

    Features arithmetical, time-shift, FFT and other computations that enable users to display waveforms with offsets and skew corrections. 

    Simultaneous harmonic measurement

    Makes it possible to simultaneously measure the harmonic components of voltage and current waves as well as the harmonic distortion factor. 

    Multifunction snapshots

    Up to 16 different waveforms- including voltage, current and power, can be displayed side-by-side, giving engineers instant snapshots of performance. 

    Detailed transient analysis

    Supports the measurement of all power waveform parameters between precisely defined start and stop cursors.

    Trend calculation

    Built-in functions for the direct calculation of variables, such as root mean square (RMS) and mean power values, to enable the identification of cycle-by-cycle trends.

    De-skew compensation

    Automatic de-skewing function eliminates offsets between current and voltage signals that may be caused by sensor or input characteristics.

    Powered by isoPRO technology

    Offers industry-leading isolation performance at the highest speeds. Delivers the performance needed to develop high-efficiency inverters that operate at high voltages, large currents, and high frequency. 

    The PX8000 is an immensely versatile instrument, unlocking precision power measurement capabilities for researchers working on everything from renewable power to advanced robotics. 

    Inverter and motor testing
    Electric and hybrid vehicles have many electrical and mechanical components, and overall performance evaluation requires measuring the efficiency of both. The PX8000's flexibility, accuracy and wide bandwidth make it ideal for drawing together the range of power readings needed to optimize the efficiency of boost circuits and inverters- two key elements in overall electric vehicle performance.

    Wide bandwidth With a 12-bit resolution, 100 MS/s sampling, and 20MH bandwidth, the PX8000 can be used for accurate measurement of inverter pulse shaped, which can then be used to fine-tune inverter efficiency.
    Transient measurement by cycle-by-cycle trend The ability to analyze cycle-by-cycle trends makes it ideal for the measurement of transient effects. When the load changes rapidly, engineers can gain insights that will enable them to improve the control of the inverter.
    Harmonic and FFT analysis With both harmonic and FFT measurement capabilities, the PX8000 can measure fundamental waveforms from 20Hz to 6.4kHz. This is particularly useful for analyzing higher harmonic component and causes of noise in electromechanical systems.
    Offset cancels by individual NULL function A common problem when testing inverter motors is the presence of ambient noise that can mean test values are nonzero even before testing begins. The PX8000's offset capabilities mean such effects can be nullified and specific inputs can be isolated for testing and analysis. 

    Screen Shot 2014 01 09 At 4.26.18 PM

    Reactor loss measurement of inverter boost circuits
    A reactor is used to filter out noise and boost voltage levels prior to the use of an inverter. It consists of an electromagnetic material core and a coil. A main focus for electrical engineers is to reduce power loss across the total inverter system, and reactor performance is of particular interest. There are two potential evaluation methods: direct loss measurement of the reactor and iron loss measurement. The PX8000 supports either methodology because it can accommodate both high frequency measurement and low-power-factor conditions. 

    Low-power-factor measurement Higher sampling rates and broad bandwidth make the PX8000 particularly useful for testing devices, such as transformers and reactors that have lower power factors. It is particularly important to measure the precise power consumption of such devices at high frequency.
    De-skew functionality To analyze power consumption in low-power-factor devices it is particularly important to minimize any time differences between voltage and current caused by sensor input characteristics. The PX8000 provides precise de-skew adjustment to compensate for this time difference. 
    Core loss measurement under high frequency Analyzing reactor core loss is an example of how the PX8000's user-defined functions can be utilized to provide an instant analysis of system performance. In the example below, core loss is calculated based on primary coil current and secondary coil voltage, while magnetic flux density (B) and magnetic field (H) are calculated by factoring in input frequency, cross-sectional area and other parameters. All values can be displayed directly by the PX8000. 

    Screen Shot 2014 01 09 At 4.26.18 PM

    Wireless charger efficiency measurement
    The development of wireless charging technology for mobile devices like smartphones and tablet devices is a focus for research. Automotive manufacturers are looking into the possibility of charging electric vehicles wirelessly. Wireless charging depends on two electromagnetic coils being configured to support particular frequency profiles. Efficient power transfer and the prevention of power loss are naturally particularly important. The PX8000 is ideally suited for measuring such systems because of its ability to operate at high frequencies and low power factors.

    Wireless charger efficiency evaluation To evaluate the efficiency of wireless transfer, at least three power measurement elements are required. The PX8000, with its four input channels, can analyze the performance of the whole system simultaneously.
    Low-power-factor device measurement Higher sampling rates and broad bandwidth make it ideally suited for wireless power transfer systems. The PX8000 supports 12-bit resolution, sample rates of up to 100MS/s and a 20MHz bandwidth. The PX8000 supports the measurement of low-power-factor systems operating at very high frequencies.
    De-skew functionality Because the PX8000 provides a de-skew function, differences between voltage and current that are introduced by sensor and input characteristics can be compensated for and eliminated from the analysis of low-power-factor systems. 

    Screen Shot 2014 01 09 At 4.43.00 PM

    Power distribution
    Power distribution systems have to maintain constant voltage and constant power during load switching or in the case of a short circuit. Distribution protectors or circuit breakers for three-phase electrical systems must therefore be tested at transient voltage and power levels. The PX8000 can capture fluctuation voltage and current waveform, calculate power parameters (including voltage and current values), determine an average over a specified period and display all values.

    Simultaneous three-phase data capture To evaluate three-phase electrical systems, at least three power measurement inputs are required. The PX8000 has up to four inputs and enables the simultaneous capture and display of voltage and current across all three phases.
    Specific time-period measurement For a true evaluation of distribution protection, it is necessary to measure a full cycle of voltage current and power values half a cycle after the recovery from a short circuit. The PX8000 can easily be set up to focus on such a specific period.
    Harmonic and FFT analysis The PX8000 has capabilities for both harmonic measurement and FFT for frequency analysis. The harmonic function can measure fundamental frequencies from 20Hz to 6.4kHz, and FFT has 1k to 100k points calculation across two channels. Such measurements are vital for identifying harmonic currents and identifying sources of noises. 

    Screen Shot 2014 01 09 At 4.45.43 PM 1

    Transient responses of industrial robots
    To evaluate motor-driven robots, power consumption of all motors and controllers are measured throughout all operational speeds and action patterns. Design engineers need to measure inrush voltage, current and power over the pattern of repeated actions. Efficiency is calculated by comparing mechanical output with input power. During actual operating conditions, the time to accelerate and decelerate such motors can range from several hundred milliseconds to several seconds. As a PWM-driven motor rotates from the reset position to the top speed, the drive frequency from the rest position to the top speed, the drive frequency changes from DC to several hundred Hz. The PX8000 gives design engineers insight into power consumption and efficiency throughout a robot's operational performance. 

    Specific time-period analysis Supports the measurement of waveform data between specific Start/Stop cursors. Combined with its multi-channel capabilities and its Long memory and History functions, this makes the PX8000 particularly useful in rating a robot's operational power consumption. 
    Efficiency measurement of boosters, inverters and motors A single PX8000 unit can measure both the input/output power of inverters and the mechanical output of a motor. By installing three power units and one AUX module, the PX8000 can be configured to provide an instantaneous measure of component efficiency.
    Transient measurement by trend computation With its instantaneous power calculations, the PX8000 is ideal for evaluation and optimizing transient effects. Its cycle-by-cycle trend analysis provides further insights into this crucial area of robotics engineering.
    Longer time-period measurement To analyze some robotic operations, it may be necessary to perform cycle-by-cycle trend analysis over a long period of time. The PowerViewerPlus software extends this mathematical capability to enable deep insights to be obtained from the data.

    Screen Shot 2014 01 09 At 4.39.37 PM

    Long phenomena capture
    The large internal memory of up to 100M Points enable long term measurements to be made at high and appropriate sample rates. 

    Screen Shot 2014 01 10 At 10.21.11 AM

    1 Video Out Video signal output for enhanced display on analog RGB displays
    2 GP-IB General purpose interface bus
    3 IRIG Synchronize multiple instruments via an external time source (optional)
    4 EXT I/O The PX8000 can be used to send a GO/NO-GO signal based on set conditions; equally external signals can be used to trigger measurement and analysis
    5 SD card slot SD- and SDHC-compliant
    6 USB-PC Enables control from a PC
    7 USB For connection to a range of peripherals including storage, keyboard and mouse
    8 Ethernet 1000BASE-T comes as standard
    9 TRIGGER IN External trigger input
    10 TRIGGER OUT External trigger output
    11 EXT CLK IN Sampling can be timed to an external signal (up to 9.5 MHz)



Yokogawa WT1800 Series Power Analyzer


    This new addition to Yokogawa's highly recognized digital power analyzer product line offers innovative measurement functions which benefit the engineer with electrical power measurements. It is the ideal measurement solution for testing Product Efficiency, and the design of Inverters, Motor Drives, Lighting Systems, Uninterruptible Power Supplies, Aircraft Power Systems, Transformer Testing and other power conversion devices.

    Many features are available that are a first in the power measurement industry *1

    Measurement - High-precision, wide range, fast-sampling, simultaneous harmonic measurement

    Voltage and current frequency bandwidth 5 MHz (-3 dB, typical)

    WT1800 Features1Faster switching frequencies increasingly require measurements in a wider range. The WT1800 provides a voltage and current frequency bandwidth (5MHz) 5-fold wider than the previous measurement range and is capable of more correctly capturing fast switching signals.


    Reduction of low power-factor error to 0.1% of apparent power (2/3 of previous model)

    WT1800 Features2 1A power-factor error is one of the important elements to ensure high-accuracy measurements even at a low power factor. The WT1800 has achieved a power-factor error (0.1%) that is 2/3 of the previous model, in addition to a high basic power accuracy of ±0.1%.


    Wide voltage and current range allowing direct input

    WT1800 Features3Direct input of measurement signals makes it possible to measure very small current that can hardly be measured with a current sensor. The WT1800 provides a direct input voltage range from 1.5 V to 1000 V (12 ranges) and a direct input current range from 10 mA to 5 A (9 ranges) or from 1 A to 50 A (6 ranges).


    0.1 Hz low-speed signal power measurement and max. 50 ms high-speed data collection

    WT1800 Features4The frequency lower limit has been reduced to 0.1 Hz from the previous 0.5 Hz (5-fold lower than the previous model) to meet the requirement for power measurements at a low speed. Furthermore, high-speed data collection at a data update rate of up to 50 ms has been inherited. In addition to normal measurement data, up to the 500th order harmonic data can be measured and saved simultaneously. The data update rate can be selected from nine options from 50 ms to 20 s.
    * Harmonic measurement at the 50 ms data update rate is possible up to the 100th order.

    Particular voltage and current range selectable

    WT1800 Features5Wide voltage and current input ranges have the advantage of extending the measurement application range. However, the downside is that the response time of the auto range tends to slow down. A range configuration function solves this problem. Since only the selected range (effective measurement range) can be used, the range can be changed up or down more quickly.

    * Comparison with Yokogawa's previous model WT1600

    *1: Applicable to a general-purpose high-precision three-phase power analyzer as of February 2011 (according to Yokogawa's survey).

    Support for Energy Conservation Technologies and Sustainable Energy Development

    WT1800 Dual Dual Harmonic Measurement
    The perspective of the efficient use of energy is boosting demand for inverters to convert 50Hz or 60 Hz AC power to  DC power, grid connection controllers to control reverse power flow occurring due to excess power, and battery chargers/dischargers. The WT1800 is capable of simultaneously measuring the harmonic distortion of the input and output current of these devices. Challenging the common wisdom that "harmonic measurement is limited to a single line," the WT1800 is capable of performing two-line simultaneous harmonic measurements. The WT1800 is also capable of measuring up to the 500th order harmonic even at high fundamental frequencies such as a 400 Hz frequency.  

    Dual harmonic measurement (option)

    WT1800 Features5The industry's first two-line simultaneous harmonic measurement is available, in addition to simultaneous measurement of harmonic and standard measurement items such as voltage, current, and power values. Previously, harmonic measurements of input and output signals
    had to be performed separately. With the WT1800, harmonic measurements of input and output can be performed simultaneously.


    Two-channel external signal input is available for power measurement and analog signal data measurement

    WT1800 Functions1(option available in combination with the motor evaluation function) Power measurements can be performed together with physical quantity data such as solar irradiance or wind power in wind generation.


    Electrical angle measurement is also supported.

    WT1800 Functions2Motor evaluation function allowing A-phase, B-phase, and Z-phase inputs (option available in combination with external signal input) Pulse or analog signals can be input for rotation speed and torque signal measurements. The motor evaluation function of the WT1800 makes it possible to detect the rotation direction and measure the electrical angle, which is not possible with Yokogawa's previous model.

    High Speed Data Capturing (option)

    WT1800 HighSpeedDataA New High Speed data capturing /HS option can measure ∑Urms, ∑Irms and ∑P from single phase (DC signal) and three phase devices every 5 ms (When external syncronisation is OFF) or, 1 ms to 100 ms when External Sync is ON (depending on the frequency of the clock signal ).

    It outputs data in 1 s blocks to internal/external memory or to a PC through a communications interface.
    Existing products can measure three phase power values every 50ms however, a 50ms data update rate is typically insufficient to be able to analyze motor start up transients or the turn-on behavior of devices.

    High Resolution Display

    All Data of 6-input, Single/Three-phase Devices can be Viewed on a Single Screen
    Important Information is Displayed in a Concentrated Format on High Resolution 8.4-inch XGA Display

    A high resolution display with a resolution about 2.6-fold higher than Yokogawa's previous model* is employed. More setting information and measurement data can be displayed

    *Comparison with Yokogawa's previous model WT1600

    Measurement data can be displayed on a single screen, along with the respective detailed setting information of 6 inputs, such as a voltage range, current range, synchronization source, wiring system, and filter. You do not need to switch display screens frequently to confirm the settings.

    WT1800 6Element 1

    With the WT1800, the data update rate can be selected from 9 options from the fastest data update rate of 50 ms to an update rate of 20 s for low-speed measurements. For example, if you want to save the average data at a 1-minute interval and inappropriately set the update rate of 50 ms, measurement results may be not correct because data can be saved only at a 1-minute interval (once every 20 times).Such a risk can be avoided by setting the update rate that is suited to the interval at which you want to save data.

    Computation Range Display

    Direct display of primary current values
    WT1800 Computation The setting ranges of voltage and current are usually displayed with voltage and current signal levels that are input to the power analyzer. The WT1800 provides not only this direct display but also added a new computation range display function to the external current sensor range. This function allows you to display the primary current range for the voltage output type current sensor. It allows you to intuitively set a range that is suited to the primary measurement signal level.

    User-defined event function

    Capture only a particular event
    WT1800 User Defined The data saving function of the WT Series is capable of continuously saving data for a long period of time. However, to check an irregular event, data must be retrieved using spreadsheet software. The event trigger function allows you to set the high and low limits and only trigger data that falls into or out of that range to be saved.

    Individual Null Function

    Function to reset only a particular input signal to zero
    WT1800 Null Function A null function allows you to reset the offset value to zero in the connected state. Previously, all inputs could only be collectively set to ON or OFF. With the WT1800, the null value for each input can be set to ON, HOLD, or OFF. In a motor evaluation test, the offset value for only a particular input can be reset to zero. This makes it possible to perform a more accurate motor evaluation test.

    Help Function

    Display the manual on the screen
    WT1800 Help Function
    English help menu supports measurement
    Display the manual on the screen Frequently used functions (keys) can be performed without the instruction manual. You may, however, want to use a new function during evaluation. The WT1800 includes a built-in instruction manual on the functions, so if a new operation is required, you can read the explanation of the function on the screen.

    Line Filter

    Capture an original signal masked by high frequency component

    WT1800 Line Filter 1WT1800 Line Filter 1a  
    WT1800 Line Filter 2WT1800 Line Filter 2a
    WT1800 Line Filter 3WT1800 Line Filter 3a


    In power evaluation such as an inverter waveform and distorted waveform, measurement values are affected by high frequency component. A new digital filter function makes it possible toremove unnecessary high frequency components superimposed on signals. A filter can be independently set for each input element. An analog filter for 1 MHz/300 kHz, and digital filter that can be set from 100 Hz to 100 kHz in increments of 100 Hz are available as standard.

    Range configuration function

    High-speed range setting suited to input signals

    WT1800 Range Config 2

    WT1800 Range Config 1

    A new range configuration function is available. It allows you to choose a particular voltage and current input range (effective measurement range). Eliminating unnecessary ranges has made it possible to achieve optimal range setting that is faster than Yokogawa's previous model*. This allows more quicker tracking of signal changes. If the peak goes over the limit, you can switch to a preset range. This is effective in reducing the production time for a repeat test, such as setting to OFF, 100 V, OFF and so on, which is performed frequently on the production line.

    Numerical and harmonic bar graphs

    Dual Harmonic Measurement

    WT1800 Dual Harmonic A harmonic measurement option (/G5) makes it possible to display both numerical data and bar graphs to help understand measurement data visually. In addition, a dual harmonic measurement function (/G6) makes it possible to measure and display two-line harmonic bar graphs (dual harmonic) simultaneously.


    Support for 6 split screen displays

    WT1800 Waveform A high resolution display makes is possible to split the waveform display into up to 6 split screens. This makes it possible to split the display of signals between the input and output of a three-phase inverter and display them simultaneously. Waveform display allows you to display waveforms for the voltage alone or the current alone, or arbitrarily set the display position, so you can also display only the signals you want to compare one above the other.

    Dual Vector

    Simultaneous two vector displays

    WT1800 Dual Vector

    Fundamental harmonic voltage and current signal phase vectors can be displayed. With Yokogawa's previous model, vector display is limited to a single line. With the WT1800, Dual vectors can be displayed. In addition, combination display of vectors and numerical values is also possible. This allows you to view the numerical parameters and voltage and current phase status visually.


    Capture efficiency changes visually


    WT1800 Trend When evaluating inverter efficiency, sometimes small efficiency changes can hardly be recognized with just numerical values. Trend display makes it possible to display measurement values and measurement efficiency as trend data in time series to help capture even small changes visually. Trend data over several minutes or several days can be displayed.

    Setting Information

    Combination display of information and numerical screens

    WT1800 Setting The screen can be split into two, with one above the other, and two types of screens can be displayed simultaneously. Screen can be selected from Numerical, Waveform, Trend, Bar Graph, and Vector displays. Another new function allows you to press the NFO button on the Numerical screen to display the setting information in the upper row and automatically scale down the numerical nformation displayed in the lower row.


    Customize display screen

    WT1800 Custom Image data can be loaded onto the screen and the position and size of the numerical data can be specified. 
    The display screen can be customized so that the corporate logo of your company is displayed on the screen, or only the measurement items you want to view, such as input and output efficiency or frequency, are displayed one above the other. 

    *The data for the created screen needs to be loaded from a USB storage device.

Yokogawa WT500 Series Power Analyzer

Yokogawa, Hioki, Tektronix, Power analyzer, Powermeter

    The WT500 Power Analyzer is a Mid Range product for single-phase and three-phase power measurements. It is designed into a compact half-rack size chassis which can also be double rack mounted. Standard features include a color TFT display and USB interface for communications and memory. The instrument has a basic accuracy of 0.1%, maximum inputs of 1000 Vrms, 40 Arms and a measurement bandwidth of DC to 100 kHz.

    - Simultaneous measurement of voltage, current, power, and harmonics
    -  High-speed data updating (100 ms)
    -  Display of numerical values, waveforms and trends
    -  Measurement of bought and sold watt hours
    -  Easy setup and operation

    Current range: 0.5 to 40 A
    Voltage range: 15 to 1000 V
    Basic Power Accuracy: 0.1%
    frequency range: DC 0.5 Hz to 100 kHz

    Key layout offers intuitive control

    1. Cursor Keys
      Cursor keys can be used to move the on-screen cursor in four different directions. The cursor keys and SET key can also be used for making selections in soft menus. The WT500's menu structure is even more user-friendly than other models.
    2. RANGE Keys
      The RANGE keys can be used to set the voltage and current ranges. Quick intuitive range control is available by using direct keys.
    3. DISPLAY Keys
      DISPLAY keys can be used to switch between numerical values, waveforms, and other displays. The display format can easily be changed.
    4. SETUP Key
      The SETUP key can be used to enter various settings required for power measurement such as the wiring method and filters.
    5. FILE, IMAGE, and STORE Keys
      The keys related to data storage are located in the same area. Data can be easily stored to USB memory.
    Tm Wt500 02



    • Simultaneous measurement of DC and AC signals
      Evaluation of DC/AC signal conversion technology is critical in the renewable energy market. With input from 2 or more elements, the WT500 can measure DC and AC signals simultaneously and calculate input-to-output efficiency.
    • Separate integration functions for charge/discharge and bought/sold power
      The WT500 is equipped with integration functions that can not only evaluate charge and discharge current such as from secondary cells, but also bought and sold power in photovoltaic power generation systems.
    • Saving measured data directly to USB memory
      Measured data can be saved in CSV format directly to USB memory.
    • Easy setup with cursor keys
      Menu-type screen offers intuitive setting.
    • Simultaneous measurement of normal data and harmonic data with the harmonic measurement, /G5 option
      RMS voltage, RMS current, power values, and harmonic components up to the 50 order can be measured simultaneously.
    • WT series for power evaluation of energy-saving equipment 
      The WT series have been used as powermeters for Green IT, Energy Star, CO2 reduction and other energy-saving equipment. The WT series-Including the WT500--supports your power evaluation needs.

    Newly Designed Architecture

    Tm Wt500 03Intuitive control by using cursor keys in four different directions.
    To reduce setting errors, menus display settings in order of relative importance in order.





    Measured Value Direct Save Function

    Tm Wt500 04Two USB ports for peripherals are installed for direct data saving (up to 1 G byte) in USB memory at shortest intervals. The saved data can be opened in applications such as Excel.

    * Excel is a registered trademark of Microsoft Corporation in the U.S.A.





    A Variety of Display Formats

    Tm Wt500 05In addition to numerical data, the WT500 can display input signal waveforms and trends (time variation of numerical data).  Bar graph display and vector display are also available with the harmonic measurement (/G5) option.

    *1 Waveforms of up to approximately 5 kHz can be displayed.
    *2 Excludes single-phase models.
    Split screen display for numerical values and waveforms is not available.







    Simple Setting and Display of Efficiency

    Two efficiency calculations can be set by selecting input elements or output elements from a list. Example: η1 = PΣ/P1 x 100% 
    η2 = PΣ/P2 x 100%

    USB Memory Storage Function

    Tm Wt500 06Only necessary items within the measured data like voltage, current, and power can be saved
    in USB memory in binary or CSV format (up to 1 GB).

    Files saved in CSV format can be opened in general-purpose applications such as Excel to allow
    displaying of data in graphs.


    Variety of Integration Functions

    Tm Wt500 07In addition to integration functions of active power (WP), current (q), reactive power (WQ), and apparent power (WS), a new feature provides measurement of bought and sold watt hours. Also, average active power can be calculated over an integration interval.
    This feature is useful for evaluating the power consumed by intermittent-control instruments in which the power value fluctuates. Average active power is calculated by using user-defined settings.






    GP-IB Communication (/C1)

     GP-IB communication enables you to control the WT500 or transfer data from a PC.

    Ethernet Communication (/C7)

    Tm Wt500 17Data can be transferred via Ethernet*communication.
    It enables file transfers using an FTP server.

    * 100BASE-TX 


    External Current Sensor Input (/EX1, /EX2, /EX3)

    Current can be measured by using current clamps without disconnecting power supply wiring (voltage output type). By setting an external current sensor conversion ratio, it can support various types of current clamp-on probes.

    VGA Output (/V1)

    By connecting to a monitor, you can create large displays of numerical values and waveforms. This function is convenient for simultaneously confirming data on multiple monitors, or to check data remotely.

    Harmonic Measurement (/G5)

    This function enables simultaneous measurement of normal and harmonic data. Harmonic components of up to the 50th order can be measured. With the WT500 you can simultaneously confirm voltage, current, and the distortion factor (THD) as well as measure the distortion factor without switching modes.

    Tm Wt500 18   Tm Wt500 19
    Harmonic Dual List   THD measurement

    Delta Computation (/DT)

    This function allows you to calculate individual phase voltages and phase currents from the line voltages and phase currents measured in a three-phase, three-wire (3P3W) system. The phase voltage can be calculated from the line voltage measured with the three-phase, three-wire (3V3A) method. This is useful when you want to determine the phase voltage in a DUT with no neutral line by using the three-phase, three-wire (3V3A) method.

    Note: This function cannot be installed on products with only one element. 

    Added Frequency Measurement (/FQ)

    In addition to the standard two channels of frequency measurement, an option is available for frequency measurement on all channels. This option provides frequency measurement of voltage and current on all channels with input elements 1 through 3 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.

    Note: This function cannot be installed on products with only one input element.

    Rear Panel

    Tm Wt500 20

    Standard feature

    1. Voltage input terminals 
    2. Current input terminals 
    3. USB communication interface 
    4. External trigger Signal, External clock input Connector
      Optional feature
    5. External Current Sensor Input Terminals (/EX option) 
    6. GP-IB communication Interface (/C1 option) 
    7. Ethernet Port (/C7 option) 
    8. VGA Output (/V1 option) 


    Example of basic characteristics showing the WT500's high precision

    Tm Wt500 21
    Tm Wt500 22
    Tm Wt500 22
    Tm Wt500 23

Yokogawa WT3000 Series Power Analyzer

Yokogawa, Hioki, Tektronix, Power Analyser, Powermeter

    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.

    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

    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 accuracy: 0.01% of reading
    • 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

    Select the model most suited to your measurement needs

    Standard Version

    • High accuracy and wide frequency range
      Basic power accuracy
      ±(0.02% of reading + 0.04% of range)
      frequency range
      DC, 0.1 Hz to 1 MHz

    • Low power factor error
      Power factor error when cosø=0
      0.03% of S
      S is reading value of apparent power
      ø is phase angle between voltage and current

    • Current range
      Direct input
          0.5/1/2/5/10/20/30 [A] or 5/10/20/50/100/200/500 [mA], 1/2 [A]
          *Models with input elements supporting current output type current sensors are planned for release

    • External input

      50m/100m/200m/500m/1/2/5/10 [V]*

    • Voltage range
          15/30/60/100/150/300/600/1000 [V]*
          * Voltage range and current range are for crest factor 3

      • 1000 [Vrms] Continuous maximum common mode voltage (50/60 Hz)
      • Data Update rate: 50 ms to 20 sec
      • Effective input range: 1% to 130%
      • Simultaneously measurement with 2 Units
      • Standard PC card slot 

    Motor Version 

    • 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.
    Tm Wt3000 04

    Rear Panel 

    Wt3rear Panel


    Standard Features Optional Features
    1. Voltage input terminals
    2. Current external sensor input terminals
    3. Current direct input terminals
    4. GP-IB port
    5. BNC connector for two-system synchronized measurement
    1. Serial (RS-232) port (option/C2) or USB port (option/C12)
    2. Ethernet port (100BASE-TX/10BASE-T) (option/C7)
    3. VGA port (option/V1)
    4. D/A output (option/DA)
    5. Torque and speed input terminals (motor version)


     Example of basic characteristics showing the WT3000’s high precision and excellent stability


    Supports Crest Factor 6 

    The crest factor is the ratio of the waveform
    peak value and the RMS value.

      When checking the measurable crest factor of our power measuring instruments, please refer to the following equation.


    * However, the peak value of the measured signal must be less than or equal to the continuous maximum allowed input

    * The crest factor on a power meter is specified by how many times peak input value is allowed relative to rated input value. Even if some measured signals exist whose crest factors are larger than the specifications of the instrument (the crest factor standard at the rated input), you can measure signals having crest factors larger than the specifications by setting a measurement range that is large relative to the measured signal. For example, even if you set CF = 3, CF5 or higher measurements are possible as long as the measured value (RMS) is 60% or less than the measuring range. Also, for a setting of CF = 3, measurements of CF = 300 are possible with the minimum effective input (1% of measuring range).

     Store Function (Comes Standard with WT3000) 

    Voltage, current, power, and other measured data can be stored to the unit's approximately thirty megabytes of internal memory. These data can be saved in binary or ASCII format on a PC card or USB memory*.

    * The USB port (for peripherals) comes with the /C5 option.


    Each measured item can be stored every data update interval. You can specify to store only the desired measured items, thus saving memory.



    Files saved in ASCII format can be opened in general-purpose applications such as Excel allowing display of data in graphs.

    * Please note that data saved in binary format can only be manipulated using dedicated software to be made available by Yokogawa.

    Excel Example

Yokogawa WT300 Series Powermeter

yokogawa wt333, wt310, hioki, tektronix, powermeter, power analyzer

    The WT300 series of digital power meters are the fifth generation of Yokogawa's best-selling compact power meters: instruments that play a key part in ensuring optimum standards of energy efficiency and conservation by measuring the power consumption of electrical equipment. Combining accurate and reliable power measurement over a wide power range with flexibility, ease of use and a choice of communication interfaces, these instruments will help developers, engineers and manufacturers of electrical equipment to ensure that their products comply with emerging IEC and EN standards and increasingly complex and stringent specifications on energy efficiency. They provide ideal measurment solutions for various applications ranging from stand by power measurement to Energy star for various manufacturers such as domestic "white goods", battery chargers, lighting systems.

    Model Description
    WT310 Single-input element model
    WT310HC High current single-input element model
    WT332 2-input element model
    WT333 3-input element model

    The WT300's wide range of funcations and enhanced specifications allows to handle all the measurement applications from low-frequency to high frequency inverters using a single power meter.

    Accuracy with fast display and update rate: 
    The WT300 series with the fast display and date update rate of Max. 100ms offers the customer a short tact time in their testing procedure. The basic accuracy for all input ranges is 0.1% rdg + 0.1% rng (50/60Hz) and DC 0.1% rdg + 0.2% rng (0.2% + 0.2% for 40A).

    Simultaneous Measurement:
    U/I/P/Freq/Integ(+/-)/Harmonics components/ THD with max. 100ms cycle.

    In addition to standard power measurements, the WT300 offer a wide range of harmonic measurement capabilities, including the ability to carry out simultaneous measurement of normal power parameters such as RMS, mean or DC power along with measurement of harmonics up to the 50th order. As a result, overall measurement times are reduced, allowing users to allocate their effort and time to other tasks.

    First in Class:

    Auto ranging function available in selected ranges.

    The auto-range function is used to select or change the range automatically in specific ranges. This results in shorter range changing times, allowing more quick and efficient testing.

    First In Clas.fw

    First in Industry:

    Auto Ranging Function For Integration Measurement.

    Typically, when power meters operate in an integration mode to measure power consumption and standby power, the measuring ranges need to be fixed. However, if the level of the input exceeds the maximum of the selected range, the test will need to be repeated. The WT300 Series has a high speed automatic ranging capability in integration mode, which removes the need to repeat any test.

    Bandwidth: DC and 0.5Hz to 100 kHz (WT310HC is up to 20 kHz for 40A).

    Direct Input: Maximum direct input up to 600V and 20A, or 40A (incase of WT310HC). The wide current input range gives the customer options to use the WT300 series from as low as 50 micro-Amps to 40Arms.

    High-speed data update (up to 10 readings per second.)

    Wide current input range

    • Wide current input ranges: The WT300 series offers a wide range of current inputs from a few mA t
    • Simultaneous measurement of all parameters: The WT300 can measure all DC and AC parameters. The WT300 series can also measure harmonics and perform integration simultaneously without changing the measurement mode. 
    • Fast display and data update rate: The fast display and 100 ms maximum data update rate of the WT300 series offers a short tact time in testing procedures. 0.1% of reading + 0.1% of range (50Hz/60Hz) 
    • MAX hold function: The maximum values of RMS/PEAK voltage & current active power, reactive power and apparent power can be held.
    • Line filter and frequency filter capability: These filter functions will cut off unnecessary noise & harmonic components for fundamental waveform measurements.
    The WT300 series offers a wide range of communication interfaces such as USB, GP-IB or RS-232 (selectable) and Ethernet (Optional)

    Allows users to have the flexibility to choose according to applications needs. Using the WTViewerFreePlus software to set up all kinds of measurements. Additionally, the numeric values, waveform display, and trend graphs of the measurement data can be displayed and saved.

    Communication Interface

    D/A output for measurement recording 

    The D/A option is used to output Voltage, Current, Power, and other measured data for recording to data loggers (+/-5Vdc outputs).

    DA Output

    Two new functions added to D/A output option. (Firmware Ver1.04)

    Two new functions, Manual Range Mode and Comparator Mode can be used conveniently with built-in PLC and recorders in production line inspection systems.

    Manual Range Mode

    The default settings will set D/A output value to rated value of measurement range. In this mode, D/A output can be zoomed in and out on each channel by arbitrarily setting the display value of measurement items when D/A output is either -5V or +5V. For example, if you measure the fluctuating current from 0.6A to 0.8A by 1A current range with D/A output range mode switched to fixed range mode, the D/A output voltage will fluctuate from 3.0V to 4.0V. The D/A zoom function is available for enlarging and observing this fluctuating value. Set the D/A output range mode to manual range mode with minimum value set to 0.6A and the maximum value to 0.8A. Then, when the current value measured is 0.6A, the output will be -5V, and when it’s 0.8A, the output will be 5V.

    Comparator Mode

    This mode will compare measured, computed, and integrated values with previously set determined value by the communication command, and output (from -5V to +5V) determined results by D/A output. If you are going to use a relay contact output, please prepare the relay and the relay drive circuit.

    The upper and lower limit value of Comparator Mode
    The following are the D/A output during the Comparator Mode

    • Less than lower limit value. Output: -5 V
    • Greater than lower limit value and less than upper limit value. Output: 0 V
    • Greater than upper limit value. Output: +5 V

    * The above 2 modes can only be set by the communication command.
    * Both modes can be set for all D/A output items.

    Installation Example

    The WT300 series power meters are easy to use, cost effective, and accurate for a wide range of applications, such as production, testing, evaluation, and research and development.

    For home appliances and office equipment

    Production line or QA testing of electric devices

    -Multiple communication interfaces such as USB, RS-232 or GP-IB and Ethernet capable.

    -The compact half rack mount size helps users build smaller test systems with a better return on investment.

    -D/A output function for data recording

    Development and evaluation tool for home appliances

    -5mA range helps small current measurement (WT310)

    -Range skip function provides the ability to select usable ranges in advance, while auto ranging adapts rapidly to changing input conditions. [PIC]

    Testing to international standards such as IEC62301, Energy Star, and SPECpower

    -The WT310 has a high measurement resolution of Max. 100µW under the 5mA range setting.

    -Simultaneous measurement of normal power parameters, harmonic components, and THD.

    -Free PCM software for IEC62301 testing

    Testing To International.fw

    Evaluation of large current equipment 

    -Direct high current measurement up to 40Arms without using external sensors

    -Auto ranging function for Integration mode.


    For industrial equipment and transportation

    Automotive- Battery or DC driven device evaluation

    -Accurate DC measurement: 0.3% total

    -Direct high current measurement up to 40A without any external current sensor.

    -Charge/Discharge energy measurement for batteries

    Duration testing and efficiency measurement for industrial motors and rotating machinery

    The WT300 series provides reliable current integration (Ah) and Energy (Wh) measurement for up to 10,000 hours. The D/A option is used to save and monitor the measurement results. An external recorder or data logger, such as a ScopeCorder, can be used to save this D/A function data along with other parameters, such as temperatures, torque, and rotation speed.

    Current Sensor Input

    Conformance and evaluation testing of uninterruptable power supplies (UPS)

    -Maximum order setting for THD calculations

    -Efficiency measurements using a single power meter

    Multiple units for parallel testing of product evaluation of electrical equipment

    New version of the WTViewerFreePlus , measurement data can be collected from multiple WT300 units
    (same model maximum 4 units).

    -Various communication interfaces such as USB, RS-232 or GP-IB and Ethernet are available.
    -Data update rate can also be measured simultaneously as fast as 100ms. 
    - power parameters can be measured up to the 200 items simultaneously.
    -D/A output function for data recording is available.

    WtViewerSyncSy 1

    Comparison of WT210/230 with WT310/330

      WT310/WT332/WT333 WT310HC WT210/WT230
    DC power measurement accuracy 0.1% of reading+0.2% of range 0.3% of reading+0.2% of range 0.3% of reading+0.2% of range
    Current range (Crest factor=3)Voltage and current 
    basic accuracy
    Direct Input 5m/10m/20m/50m/100m/200m/
    0.5/1/2/5 /10/20[A]( WT310) 0.5/1/2/5/10/20[A](WT332/WT333
    1/2/5/10/20/40[A] 5m/10m/20m/50m/100m/200m/
    External current input EX1: 2.5/5/10[V]
    EX2: 50m/100m/200m/500m
    /1/2[V] (OP.)
    EX1: 2.5/5/10[V]
    EX2: 50m/100m/200m/500m
    /1/2[V] (OP.)
    EX1: 2.5/5/10[V]
    EX2: 50m/100m/200m[V] (OP.)
    Effective input range for voltage & current (CF=3) 1% to 130% 1% to 100% (40A range only) 1% to 130%
    Maximum displaying value for voltage & current (CF=3) 1% to 140% 1% to 110% (40A range only) 1% to 140%
    Effect of Power Factor (CF=3) 0<PF<1 Power reading x {power reading error + (power range / apparent power reading) + tanφ x (influence when PF = 0)} % Power reading x {power reading error + (power range / apparent power reading) + tanφ x (influence when PF = 0)} % Add the power reading x {tanφ x (influence when PF = 0)}%.
    Simultaneous measurement of RMS, Voltage MEAN & DC Yes Yes No
    Frequency measurement

    2 channels (voltage & current)

    2 channels (voltage & current) selected voltage or current (one)
    Number of display items 4 items 4 items 3 items
    Sampling rate Approximately 100 kS/s Approximately 100 kS/s Approximately 50 kS/s
    Harmonic measurement Yes (OP, /G5) Yes (OP, /G5) Yes (OP, /HRM)
    THD calculation maximum order setting Yes (OP, 1-50th) Yes (OP, 1-50th) No
    Auto ranging of integration Yes Yes No
    Communication interface USB Yes Yes NO
    GP-IB Yes GP-IB or RS-232 Yes GP-IB or RS-232 Yes (OP) GP-IB or RS-232C
    RS-232 Yes RS-232 or GP-IB Yes RS-232 or GP-IB Yes RS-232 or GP-IB
    Ethernet Yes (OP) Yes (OP) NO
    IEEE standard for GP-IB IEEE488.2 IEEE488.2 IEEE488.1 and IEEE4882.
    Comparator function No No Yes
    Viewer software Free (included) Free (included) Free (download)

SA2100 Power Quality / Energy Analyzer

Yokogawa, Suintest, SA2100, Wt310, Fluke 434, Hioki, Tektronix, Powermeter, Power Analyzer, quality analyzer, energy, enerji

    Safety: CAT III 1000V / CAT IV 600V
    Standards: IEC61000-4-30 (2008) S class, EN50160 (2007)
    Easy operation to capture the power quality problem
    Single-phase 2 W/Single-phase 3 W/ 3-phase 3 W/ 3-phase 4 W
    Display: Run Chart, Bar Chart, Vector Graphic, Waveform,Event List, Readings
    8G Memory Card to make the long-term measuring data storage
    Support USB Interface
    Support LAN Interface


    Measurement Range





    3-phase line input+1neutral line input
















    ±1% ± 5digits



    ±1% ± 5digits




    ±1% ± 5digits






    42.5~57.5Hz(50Hz nominal)



    51~69Hz(60Hz nominal)



    Dips & Swells


    0~200% of nominal voltage






    ±1% ±5 counts



    ±1% ±5 counts

    Threshold levels

    Programmable thresholds in percent of nominal voltage

    Event detection based upon ½ cycle rms voltages

    Captures Dips,Swells Interruptions and Rapid Voltage Changes


    Hhh, mm, ss, mmm




    Harmonic Order




    Inter-Harmonic Order
















    DC Relative










    ± nx1.5°

    Power And Energy

    Active Power/Apparent Power/Reactive Power








    Power Factor


















    Voltage Phase Angle



    Current Phase Angle



    Voltage Transient









    Min. Tested Time


    Sampling Rate


    Inrush Current





    Inrush Duration

    6s~32 min selectable





    Parameter,duration time and time interval can be set by user,which can be export on PC



    Max. recording time

    1 year

    System Monitor


    Vrms, Arms, Harmonic Volts, THD Volts, Plt, Vrms1/2, Arms1/2, Vneg, Hz, dips and swells, unbalance

    Record Time


    Record Event Number



    According EN50160 or customer definable