Notice: This product was discontinued on 3/18/2011.
WT1800 High Performance Power Analyzer is a replacement product.

The WT1600 is power meter designed for measurement of extremely small currents in energy-saving equipment, as well as measurement of large currents for evaluating large-sized loads. The WT1600 works with voltages ranging from 1.5 V up to 1000 V, supporting a wide range of applications. Because it can accept signal inputs for up to six phases, a signal WT1600 unit can measure I/O signals on inverters.



Up to Six-Phase Input in One Unit. Synchronized Measurements between two units simplifies your processes. 

A single WT1600 unit can make up to six different power measurements (six input each for voltage and current). With the measure start-stop function (synchronized measurement), two WT1600 units (12 inputs) can be synchronized.

  •     Up to Six-Phase Input on One Unit. Synchronized Measurements Between Two Units
  •     Wide Current Input Ranges
  •     Data Storing as Fast as 50 ms (20 Times per Second)
  •     High Precision and Wide Bandwidth
  •     Increased Assured-Accuracy Range for High-Precision Measurements
  •     A Variety of Display Formats
  •     Display Harmonic Data as Bar Graphs, Vectors, and Lists
  •     Built-in Printer (Optional)
  •     A Variety of Interfaces (Optional)
  •     Integration Function Capable of Handling Rapid Changes in Input Signal
  •     Other Special Features

Wide Current Input Ranges 

The WT1600 has two different input elements. A 5 A input element is provided for measuring extremely small currents, while a 50 A input element serves to measure large currents.

Both of the elements can be installed together in the WT1600.
The current for the 5 A input element can be set as low as 10 mA for measuring extremely small currents in energy-saving equipment.

  •     Two input elements
  •     5 A input element
  •     10/20/50/100/200/500 mA, 1/2/5 A (DC, 0.5 Hz to 1 MHz)
  •     50 A input element
  •     1/2/5/10/20/50 A (DC, 0.5 Hz to 100kHz)
                 Current sensor input range (same for 5 A and 50 A input elements; standard)

                  50/100/250/500 mV, 1/2/5/10 V (DC, 0.5 Hz to 500 kHz)

Data Storing as Fast as 50 ms (20 Times per Second)


The data can be stored at intervals as short as 50 ms. The WT1600 rapidly calculates input parameters such as rms voltage, rms current, and power. Measurements can be stored in a 11-MB internal memory, which is helpful for applications such as:
Evaluation of characteristics at motor startup including torque and rpms (requires the optional motor evaluation function)
Measurement of rapidly fluctuating secondary voltage and lamp current when a light is turned on. 

High Precision and Wide Bandwidth    

The WT1600 has a higher measurement accuracy than any instrument in its class.

It also features a 1 MHz measurement bandwidth (voltage, current) effective for such things as the evaluation of high-frequency illumination devices using inverters.
Accuracy Characteristics for 50 A input Element (typical value)

Accuracy Characteristics for 5 A input Element (typical value)

Accuracy Characteristics for External input (typical value)


A Variety of Display Formats

 In addition to numerical data, the WT1600 can display input signal waveforms. Eleven different display formats can be selected on a single WT1600 unit, so it is not necessary to connect an external waveform viewer to check waveforms.

The WT1600 displays measurements for each display updating interval in a time series. The time axis (T/div) can be set in the range of 3 seconds to 24 hours (wave off).
Changes in up to 16 different parameters, such as voltage, current, active power, and apparent power, can be observed simultaneously in long-term continuous tests.

Increased Assured-Accuracy Range 

 For High-Precision Measurements 

Accuracy is assured at input ranges of 1% to 110% for AC, and 0% to 110% for DC. (However in the case of AC, it is necessary to input either a voltage or current that exceeds 10% relative to the range in order to have the voltage and current rms values calculated precisely.) 

The diagram shows the effective input measurement range (AC voltage and AC current from 1% to 110%) at which accuracy is assured, by range-value rating. When using a 1 A range-value, accuracy is assured down to 10 mA. Also, DC voltage and DC current have assured accuracy from 0% to 100%.

Since the voltage and current ranges are fixed during the integration mode, the WT1600's assured accuracy over a wide range makes it a very useful tool.
The WT1600 stands out when it comes to measuring equipment with large input fluctuations such as intermittent control devices and copiers that can repeatedly alternate between normal operation and sleep mode.

Display Harmonic Data as Bar Graphs, Vectors, and Lists

The harmonic measurements function is a standard feature on the WT1600. It is capable of measuring waveforms with a fundamental frequency ranging from 10 Hz to 1 kHz. Analysis results up to the 100th order from 50/60 Hz fundamental waves can be displayed as numerical values or bar graphs. The WT1600 can display harmonic measurement result as lists, and fundamental waves as vectors.

Built-in Printer (Optional) 

Print out screen images using the built-in printer. The printer is located on the front panel allowing you to rack-mount the instrument. You can output not only hard copies of the screen, but also numerical data, and harmonic analysis data as well.


A Variety of Interfaces

Ethernet Port (10 BASE-T) and Internal Hard Drive (optional) 

The Ethernet function allows you to use FTP server, FTP client, Network printing, Automatic Mail Transfer (SMTP), and others.

Motor Evaluation (optional)
The WT1600 can measure the output from a speed and torque sensor on the output of an electric motor, and calculate torque, rotating speed, mechanical power, synchronous speed, slip, motor efficiency, and total efficiency. Both analog and pulse inputs can be accepted from the sensor. In addition to numerical values, waveforms can be displayed to provide a visual picture of fluctuations in parameter values.

D/A Output (30 channels)
Analog outputs are available for up to 30 measurement parameters. With the 6-element WT1600, as many as five analog outputs are available for each element.


SCSI interface (optional)

With the SCSI interface, you can save measured data to
an external device such as an HDD. This is useful when
you want to efficiently save measured data and image files. 

VGA output

By connecting the VGA output signals to an
external monitor, you can create large displays
of numerical values and waveforms.

Integration Function Capable of Handling Rapid Changes in Inputs   

 Input signals are sampled at high speed (approximately 200 kHz), so power can be measured even on rapidly fluctuating input signals. Integrated power can also be determined separately for each polarity. 


Other Special Features   

6.4-Inch TFT Color LCD
Capable of displaying an easy-to-view four-parameter display (two parameters during simultaneous display with waveforms), or increasing the number of parameters up to 78.

Rotary Knob
Can be used in combination with keys next to the screen for easy operation. The rotary knob allows the user to rapidly locate the desired parameter from numerous parameters shown on the screen.

Saving Waveforms, Numerical Values, and Screenshots
Waveforms, numerical values, and screenshots can be saved to the 3.5-inch floppy drive (standard feature) or the optional internal hard drive. Settings can be saved and retrieved.


Name Description File Type  
Bulletin 7601-00E Digital Power Meter WT1600 pdf icon
1,018 KB
Name Description  
How to Measure Electrical Power If a product uses power, then power consumption and power quality measurements must be made as part of product design and test. These measurements are essential to optimize product design, comply with standards and provide nameplate information to customers.

This article will discuss best practices for making these measurements, starting with power measurement basics and proceeding to the types of instruments and associated components typically used to make measurements. The article will conclude with real-world examples, which apply the information imparted earlier in the article to solve practical measurement problems. Although most of us have been exposed to basic power measurement equations, a primer is helpful to summarize this information and to show how it applies to product design and test.
Learn More
Name Description  
LabVIEW Drivers for WT1600 LabVIEW drivers for WT1600 y-Link
Power Consumption Measuring Software For use with WT3000/WT3000E, WT1800/WT1800E,WT1600*¹, WT500, WT210*¹, WT310 and WT310E. Conforms to IEC62301 Ed2.0(2011) and EN 50564:2011 testing methods.
*¹ The WT1600 and WT210 discontinued sales
TMCTL TMCTL is a DLL to support development of custom software. By using this DLL, users can write original programs to control instruments from a PC. y-Link
Visual Basic Sample Program (Ethernet/USB) for WT1600 This is a Visual Basic sample program of GP-IB, RS232, Ethernet and USB for WT1600. y-Link
Visual Basic Sample Program for WT1600 This is a Visual Basic sample program of GP-IB for WT1600 y-Link
Visual C++ Sample Program (Ethernet/USB) for WT1600 This is a Visual C++ sample program of GP-IB, RS232, Ethernet and USB for WT1600.
WT File Reader for WT500/WT1600/WT1800/WT1800E/WT3000/WT3000E This software allows you to display data saved in WT500/WT1600/WT1800/WT1800E/WT3000/WT3000E on your PC and change it to .csv format. y-Link
WTViewer 760122 - Update WTViewer acquires numeric, waveform, and harmonic data from the WT3000/WT3000E/WT1800/WT1800E/WT500 Digital Power Analyzer via Ethernet, GP-IB or serial communications (RS-232). Learn More

Technical Consumer Products, Inc.

Ohio, USA - Technical Consumer Products, Inc.

"I have always been able to count on Yokogawa to produce superior products for engineering and laboratory use."

Technical Consumer Products, Inc. (TCP) manufactures a variety of energy-efficient fluorescent lighting products for residential applications, as well as commercial grade ballasts, customized light fixtures, emergency lights, and light emitting diode (LED) lighting products. TCP is an ENERGY STAR® partner offering ENERGY STAR® approved compact fluorescent lamps and fixtures.
Tm Testimo 08
Mr. Mac McClellan, Technical Manager (left) Aurora International Testing Laboratory Technical consumer products, Inc.
Mr. Dan Smith, Sales Engineer (right) Measurement instrument (Sales representative)
The Yokogawa WT1600 Digital Power Meter is used in our engineering test lab for performance and efficiency testing of ballasts and various lighting systems. We like the WT1600 because of its six element input capability. For a typical fluorescent lamp and ballast test we need five power measurement channels. We must measure the single-phase input power to the ballast, and each of the four outputs of the ballast. With the WT1600 we can take all the measurements simultaneously with just one instrument. This simplifies our testing and software development, and saves us money. The 1 MHz bandwidth of the WT1600 makes it very suitable for the testing of our electronic ballasts and other high frequency lighting products.

We use the WT1600 in a test rack with other power sources and instruments to control the test. The wide voltage and current ranges of the WT1600 make it perfect for direct connection to our lighting systems. With input ranges of up to 1000 Volts and 50 Amps, we can make all of our measurements without additional voltage or current transformers.

In addition to the WT1600, we use several of the Yokogawa WT210 Digital Power Meters for testing various lighting products like our compact fluorescent lamps. We also have a DL1520L Digital Oscilloscope. In my thirty plus years of using measurement instrumentation, I have always been able to count on Yokogawa to produce superior products for engineering and laboratory use.

The local Yokogawa sales representative, Mr. Dan Smith of Measurement Instruments, has always been very helpful with pre and post sales and product support questions.

Visit the Technical Consumer Products, Inc. Web site.

Delta Power Electronics

Delta Power Electronics Center Shanghai, China

"YOKOGAWA has given excellent support in products and services."

Recognizing tremendous marketing and technological opportunities, Delta Power Electronics Center (DPEC) was founded on June 5th, 1999 in Pudong, Shanghai by Delta Group. We believe that for Delta Group-the largest manufacturer of power electronics products-the key to staying at the forefront of power electronics technology lies in the hiring of excellent people, and creating technological innovation. DPEC gathers the top power electronics researchers from academia and industry. Tm Testimo 15
DL1740 Digital Oscilloscopes

These graduates from the top universities in China do development work on high frequency technology, high efficiency topology, magnetic technology, thermal and packaging approaches, optimum control, EMI and EMC technology, and simulation software platforms. The fruits of their efforts will greatly benefit Delta Group and our partners. In the past three years, YOKOGAWA has given us excellent support, products, and services. There are many instruments from YOKOGAWA installed at our center, including DL1740 Digital Oscilloscopes, WT1600 Digital Power Meter, and the PZ4000 Power Analyzer. We look forward to a mutually beneficial relationship in the coming year.  Tm Testimo 16
Visit the Delta Power Electronics Center web site.

Fujitsu General, Ld.

Fujitsu General, Ltd. Chooses the WT1600 Digital Power Meter and SignalExplorer DL7100

We are working on developing control technologies for home electronics, mainly air conditioner motors.
One of the important keys to producing reduced-energy consumer appliances is to decrease the power consumption of the motors and inverters. To evaluate power consumption, we use the WT1600 Digital Power Meter.

The reason we chose the WT1600 was its ability to analyze harmonics of waveforms input from motors or inverters.
Especially since the voltage and current waveforms input from motors tend to be quite distorted, each frequency component must be analyzed. Therefore we need an oscilloscope to monitor waveforms, and an FFT analyzer to measure the voltage and current of each frequency component. The WT1600 can accept simultaneous voltage and current input on 6 channels, and easily perform multichannel measurement of voltage and current at each frequency component, all in one unit.

Tm Wt1600 C04
Fujitsu General, Ltd.
Development Division 2,
Development Technology Group,
Mr. Masanori Mukami

 The WT has a wide frequency bandwidth of 0.5 Hz to 1 MHz, so it's capable of measuring even distorted waveforms at high accuracy. Furthermore, a single WT can compute motor and inverter I/O efficiency, so it's extremely useful for evaluating decreases in power consumption.
With normal measurement, dispersion often occurs in instantaneous data, so we use the averaging function with its wide range of adjustability to obtain the average characteristics. Also, the data update rate can reach 50 ms (20 times per second), so we can load data that fluctuates at both slow and fast intervals.
The WT has a variety of display functions-from simultaneous display of numeric and waveform data to bar and vector graphs for watching the frequency-and the displays are in color which makes them really easy to read.
Tm Wt1600 C05
Our group worked on the
motor for the Nocria

To evaluate whether the motor control is working as designed, we have to be able to observe digital and analog signals simultaneously.
The DL7100 SignalExplorer digital oscilloscope has 4 channels of analog input and 16 bit logic input in one unit, so it's very efficient for simultaneous measurement. One of the main reasons we chose it was because of its sampling rate of 1 GS/s, and its high display update rate.
 Tm Wt1600 C06
ACNocria TM
Products by Fujitsu General
Visit the Fujitsu General Web site.

Nagoya Institute of Technology

Nagoya Institute of Technology Chooses the WT1600 Digital Power Meter.

We do development for power electronics research in the Matsui laboratory. Our work can be broken down into three broad categories. The first is research on power conversion technology. For example, when power supplies of PC convert AC to DC inside, they generate harmonics.
These harmonics return to electric power systems coming from power plants, and can cause malfunctions and overheating. Guaranteeing that these harmonics can be controlled is one of our main objectives in the quest to deliver extremely stable and high quality electricity to users.
Tm Wt1600 C01
Nagoya Institute of Technology
Dept. of Electric & Computer Engineering
Mr.Takashi Kosaka, Dr. Eng. (right)
Mr. Shingo Fubuki,
Sophomore at the Graduate School (left)
The second is research on motion control. For example, when controlling items such as machine tools, since there is non-linear friction and other phenomena from non-linear elements, those elements drag down the accuracy of the control. To achieve high quality manufacturing process technology, we have to conquer the main causes of those problems, and make sure we can achieve the most important thing which is free, fast, and accurate control.

The third is research on AC motor drives. AC motor drives are currently used in various fields, and the requirements for motors are diversifying. Since there are totally different requirements for each of the different uses, it's important to design the best possible motor for the particular application. For that reason, we are developing CAD systems for Applications Specific Electric Motor drive (ASEM).
And among the various AC motors, we're focusing our attention on synchronized motors which are more efficient. However, since a rotor position sensor is generally necessary, we are developing sensor-less technology to fill the requirements of certain applications.

The motivation for bringing in the WT1600 Digital Power Meter for our motor drive research was to use a power meter that was able to analyze motor characteristics and thereby precisely measure whether values that were evaluated beforehand were actually correct.
In recent years, semiconductor power conversion technology (PWM technology) has been widely used for supplying power to motors. The WT1600's high, 1 MHz frequency bandwidth means we can expect highly accurate power measurement for PWM. Also, while viewing the waveform display, trend display, or vector display, we can measure various power parameters simultaneously which is a definite plus. It comes with a 50 A input element so large currents are also supported.

In R&D on ASEM CAD system, we also use the WT1600. We measure the voltage, current, and power on the inverter input and the motor input. Before bringing in the WT1600 we needed an additional digital oscilloscope, but now we can take measurements with just this 1 unit. That's one of it's biggest merits we think. We can view not only numeric data, but also simultaneously view waveforms of the input signals, so we don't have to use a waveform observation instrument such as an oscilloscope; that makes it tremendously efficient. The built-in printer and the ability to save to floppy disk make it easy to generate reports, so we plan to use it even more from here on out. The WT1600 we purchased has the motor evaluation option installed so in the future we will use it to measure the voltage output from torque-meter, and we plan to implement it for efficiency evaluation as well.

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Example of a screen for synchronous reluctance motor structural analysis using the finite element method (FEM)
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NIU also uses the DL1540CL Digital Oscilloscopefor operation checks on control hardware


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