WT1600 Digital Power Meter (DISCONTINUED)

Notice: This product was discontinued on Jun 30, 2011. See this 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.


This white paper describes the WT1600 precision power analyzer, a model that has been discontinued and replaced with the WT1800E. Please visit the WT1800E product page for more information regarding the WT1800E.

We have developed the WT1600, a high-precision, wide-bandwidth power meter. The WT1600 can measure DC and AC signals from 0.5 Hz to 1 MHz with a basic power accuracy of 0.1%. With the maximum of six input elements installed, a single WT1600 can measure the efficiency of a three-phase inverter. In addition to the functions of conventional power meters, it has wider ranges and various functions including waveform display. This paper gives an outline of the WT1600. 

This could be caused by any of the following: Is there any crosstalk (especially around the 2nd order)? Are there any effects of CMRR (especially around the 2nd order)? Is the location of measurement immediately next ...
The difference in measurement values can be attributed to the difference in calculation methods for normal mode and harmonic mode.   The voltage, current, and power in normal mode are displayed as the total of the ...
The peak value and crest factor may be unstable if they have not been captured accurately. If the peak value is not stable, neither will the crest factor be stable. The cause is the difficulty in capturing the narrow ...
When measuring input signals of distorted waves, signals that are DC-offset or signals that include superimposed harmonic components, will result in different values for power factor and phase angle than those expected ...
This is due to measurement and calculation error, or differences in calculation methods.   On the WT, the three-phase apparent power (ΣS) equation is calculated under the assumption of a balanced condition (the ...
In the three-phase three-wire, or 3V3A wiring scheme, the phase angle of voltage and current input to each input differs from that of the actual load because it is the line to line voltage that is measured.  In ...
In the three-phase three-wire, or 3V3A wiring scheme, the phase angle of voltage between each input element is 60 degrees because it is the line to line voltage that is measured. Please download and refer to the ...
 In the case of three-phase three-wire, or 3V3A wiring, the power, power factor, and phase angle of each input element do not match because it is the line to line voltage that is measured.   Please download and refer ...
Check for differences in the specifications or features of the instruments. For values that do not match when inputting a 50/60 sine wave Check whether the value is within the specifications (error) of each power ...
The measurement intervals of the measured I/O data must overlap exactly. Check the sync source setting. For example, route the input to a three-phase device under measurement to input elements 1-3 on the power meter, ...
Check for differences in the specifications or features of the instruments. For values that do not match when inputting a 50/60 sine wave Check whether the value is within the specifications (error) of each power ...
The following may be causing the problem. 5V may have occurred during rating. Check the range setting again. DA output error can affect the values when the input is smaller than the rating. Have you checked the error ...
Check the Synch Source and Frequency Filter settings When a single-phase signal being measured fluctuates around power factor of 1.Slight fluctuations in the measured values of voltage, current, and power can cause a ...
Yes, by using the User-Defined Function feature, the WT1600 can display the average power value during integration. Enter the following equation to calculate the average power for Element ...
The WT3000 D/A output terminal is electrically isolated from the case. For all other models, the D/A output terminal is connected to the case.
The value depends on the model of the power analyzer. For WT1000, WT2000, WT100, and WT200, it is fixed to the fundamental wave. For power analyzers with 7 segments LED, the relative harmonic content is fixed to the ...
Please refer to the attached Excel spreadsheet for complete information regarding the RS232 cable pinouts used with by the WT & PZ Series Power Analyzers.
There are several items you will need to check and verify to solve this issue. Verify the GP-IB connectionSome instruments have a D/A output connector located next to the GP-IB connector. There have been some ...
While the unit is in CALIBRATION MODE, the calibrator may be "loaded" by the input element. After running the performance test (with METCAL), if the input element reads low values after the new CALIBRATION ...
When the WT1600 is set into Integration mode, the averaged power (watt) values can be calculated and displayed. This is available only by using the User-Defined Function feature found in the MEASURE button menu.  The ...
This is to prevent an open current circuit. Among non-Japanese power meters, there are products that also use safety terminals for current terminals. Safety terminals can be said to be safe because the terminal is not ...
The input terminals on all Yokogawa power meteras are located on the rear panel. This takes into account safety when handling the measuring instrument.    The signal input to the power meter normally carries high ...
Check the "Sync Source" and zero cross filter (frequency filter) settings. For the WT3000, "Sync Source" setting is irrelevant if the data update rate is 250 ms, 500 ms, 1 s, or 2 s. Sync Source SettingIn principle, if ...
The waveform may actually not be a pure sine wave. Even though a 50/60 Hz sine wave is expected, the following factors may be involved: The waveform is slightly distorted (harmonic components are mixed in) Small ...
 You can not use LabVIEW and WTviewer to communicate with the PC using same USB driver. The USB driver for LabVIEW and the USB driver for WTviewer is different. Yokogawa's YKMUSB driver is used by WTviewer ...
The AC Power Input in all Yokogawa instruments is designed as a 3-pin connection (one of which is a GND pin). In some parts of the world, PCs are sold with AC power cables that are 2-pin. Often times this means the ...
The WT1600 can support printers that have the following commands. ESC-P ESC-P2 (for printers that support ESC/P raster commands) BJ PCL5 LIPS3 Post Script Before attempting to connect a Network Printer to the WT1600, ...
THE WT1800 and WT500 STORE function can only be used to record NUMERIC data.   The WT1600 and WT3000 STORE function can be used to record both NUMERIC and WAVEFORM data.
The part numbers for the black current knobs and pads (studder) is listed below: A9105ZG: Black Current Knob Set of 2 B9292GX: Pad (Studder) Set of 10
For the WT1600, to view the harmonic data in the Bar Graph window of WTViewer, you have to select all the harmonic orders in the Numeric window. WTViewer's Bar Graph window display follows the harmonic items activated ...
Although WTViewer is not officially supported under the Linux environment, users have successfully done so using WINE (flavor of Linux) via RS232. For connectivity to WT210/WT230, WTViewer requires that the meter be set ...
The following product tutorial guides have been created for the WT and PZ Series Power Meter and Analyzer instruments and are available for download. Each tutorial contains quick and easy steps to help you get started ...
Output function: HArWhen the default output item is set to 1, the printout time for up to the 50th order is about 116 seconds. The printout time for up to the 25th order is about 75 seconds. Output function: HArWhen the ...
Send the appropriate command as shown below to your instrument, then read in all the data that is returned.     PZ4000: "NUMERIC:NORMAL:VALUE?"    WT1600: "NUMERIC:NORMAL:VALUE?"    WT100/200 series ...
Send the "NUMERIC:FORMAT:ASCII" command This sets the data format for the data you want to read out. Measured data read out using the "NUMERIC:NORMAL:VALUE?" command is output as an ASCII string. Send the ...
You can use the "STATUS:ESSR?" command to access the extended event register and determine whether the data was updated. You can judge the data update status by referencing bit 0 (UPD) of this register. However to do ...
To change the voltage range on element 1 to 30 V, send the "INPUT:VOLTAGE:RANGE:ELEMENT1 30V" command to the measuring instrument.To change the current range on element 1 to the 1 A range, send the ...

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