World-class Accuracy, Stability, and Versatility
Measuring true power is more than multiplying voltage and current. Advances in complex power electronics and energy efficiency create measurement challenges that can confound even the most experienced engineers.
Unlike data acquisition and oscilloscope-based power measurement tools, power analyzers are purpose-built to guarantee measurement accuracy when testing devices that generate, transform, or consume electricity.
Yokogawa, the world's leading supplier of electrical power analyzers, provides solutions for testing power electronics, inverters, motors and drives, lighting, home appliances, office equipment, power supplies, industrial machinery and more.
Measure Power with Confidence
- Guaranteed accuracy across a wide range and bandwidth
- The preferred choice of standards organizations
- A solution for every application
- Extensive educational resources
| Model | WT300E | WT500 | WT3000E | WT1800E | PX8000 |
|---|---|---|---|---|---|
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 |
 |
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| Number of Input Channels | 1, 2 or 3 | 1 - 3 | 1 - 4 | 1 - 6 | 1 - 4 |
| Basic Power Accuracy (60 Hz) | 0.1% of Reading + 0.05% of Range |
0.1% of Reading + 0.1% of Range | 0.01% of Reading + 0.03% of Range |
0.05% of Reading + 0.05% of Range |
0.1% of Reading + 0.1% of Range |
| Bandwidth | DC, 0.1 Hz to 100 kHz | DC, 0.1 Hz to 1 MHz | DC, 0.1 Hz to 1 MHz | DC, 0.1 Hz to 1 MHz | DC to 20 MHz |
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- Standby Power Measurements, Energy Star®, SPEC Power® and IEC62301/EN50564
- Evaluation and Testing of Batteries, Home Appliances and Uninterruptible Power Supplies (UPS)
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- Power and Harmonic (THD) Measurements with Independent Range Controls
- Efficiency measurements of AC/DC or DC/AC Inverters & Motors
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- Power, Harmonics (THD) Measurements (up to 500th order)
- Electrical & Mechanical Efficiency of Inverters and Motors in EV and HEV
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- High Accuracy Electrical & Mechanical Efficiency of Inverters and Motors in EV and HEV
- IEC Harmonics (IEC61000-3-2 & IEC61000-3-12); Voltage Fluctuations and Flicker (IEC61000-3-3 & IEC61000-3-11)
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- Transient/Start-up Waveform Capture & Power Analysis
- Harmonics, Cycle by cycle and FFT analysis
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The Yokogawa CW500 is a portable power analyzer that logs transient power phenomena in addition to measuring single to three phase power.
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This panel-mounted power meter and energy meter with a large, three-row LED display integrates all the measuring functions required for power management in locations such as factories and buildings into a single unit.
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Yokogawa's Power Analyzer software manages numeric, waveform, and harmonic data measurements. It enables data transfer and instrument configuration for your computer.
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Current transformers are used to step down high AC and DC currents to a lower level that can be measured directly by the power analyzer.
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Accessories for digital power analyzers include various voltage and current transformers, clamp-on current probes, and a selection of test leads.
Overview:
In this application note you will learn when and how to use different methods to connect a current transformer to a power analyzer.
Overview:
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.
Overview:
We have developed the WT3000 Precision Power Analyzer, which features the world's highest measurement accuracy of ±0.02% of reading and a measurement bandwidth of 0.1 Hz to 1 MHz as well as DC signals.
Overview:
Yokogawa developed the PX8000 precision power scope, a high-accuracy power meter, which can measure reactor losses in inverters, motors and the like, by analyzing waveforms. The major specifications of the instrument are as follows: basic accuracy is 0.2%, voltage measurement bandwidth is DC and 0.1 Hz to 20 MHz (-3dB, typical), and current measurement bandwidth is DC and 0.1 Hz to 10 MHz (-3dB, typical). The PX8000 offers the functionality usually provided by a waveform measuring instrument, such as a variety of triggers, tracking, statistical processing, and waveform parameter calculation functions. Furthermore, to improve measurement accuracy at low power ratios this product comes with a de-skew function for correcting signal delays from the current sensor and a data latency adjustment function. This paper describes the PX8000, focusing on a newly developed element dedicated for power measurement and technology for phase correction.
Overview:
This white paper describes the WT1800, a precision power analyzer that has been replaced by the WT1800E, a unit with numerous improvements including better accuracy. Please visit the WT1800E product page to learn more about the WT1800E.
To keep pace with the increasing speed of switching devices in inverters, Yokogawa has developed the WT1800 precision power analyzer with 10 times faster sampling speed and 5 times wider frequency bandwidth compared with previous models. Its basic accuracy is 0.15% and the frequency bandwidth of voltage and current is 0.1 Hz to 5 MHz (-3 dB, Typical) including the DC component. With up to six inputs, a single WT1800 unit can measure the efficiency of three-phase inverters. In addition, the high-speed data capturing mode allows the WT1800 to measure transient power. This paper describes the high-speed, real-time power measurement technologies underlying these functions.
Overview:
We have added a harmonics current/flicker measuring function to the WT3000 Precision Power Analyzer with world-leading accuracy of power measurement. We have also created PC software for harmonics current/flicker measurement. This PC software and the WT3000 comply with the IEC61000- 3-2 harmonics current standard and IEC61000-3-3 voltage fluctuation/flicker standard, thus enabling the electrical power, harmonics current and flicker of electrical equipment to be measured precisely with a single unit. This paper outlines the harmonics current standard and voltage change/flicker standard, along with the measurement principle and PC-based software of the WT3000.
Overview:
In recent years, there has been an increased emphasis on energy efficiency in industrial systems, resulting in more penetration of power electronics in equipment such as inverters and motor drives.
Overview:
Many industry trends are conspiring to make power analysis an important consideration for designers. The New Electronics editor takes a look at this expanding arena by talking to Hafeez Najumudeen of Yokogawa.
Overview:
Clive Davis from Yokogawa's Europe T&M office describes a measurement system for real-time calculations of power and efficient in power electronics devices, and gives some examples.
Overview:
Hafeez Najumudeen at Yokogawa Europe explores how power measurements are in increasingly vital aid to modern day energy efficiency.
Overview:
"Error(Code:846): Attempted to start integration while measurement of peak overflow was in progress"The following error code will appear if Peak Over has occurred and you attempt to start integration. The WT3000 has two ...
Overview:
The specifications for the Type 2553 DC Voltage/Current Standard was changed on June 1982. The service manual was not rewritten to reflect these changes. There are two types of 2553:
1979/4 -- ...
Overview:
The WTViewer Save Setting feature will only save the setting information of the WTViewer. The Save Setting feature will NOT save the setting information of the instrument. The saved file for the WT500, WT1800 or ...
Overview:
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 ...
Overview:
It is not necessary to specify the accuracy for PST values outside the range of 1.0, as any value larger than 1.0 is non-standard. The standard (IEC 61000-3-3) requires that the value of the short-term light ...
Overview:
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, ...
Overview:
The circuit design for the line filters used on the WT & PZ series instruments are similar to Butterworth filters but have been redesigned. We redesigned the original filtering characteristic to obtain a ...
Overview:
There are no built-in over temperature protection devices in the WT3000. The official operating range covered by warranty is listed at 5°C - 40°C. Our own internal test have revealed that it is possible to ...
Overview:
The part numbers for the 2 piece screws in the WT210 Rack Mount Kit (751533-E2) are listed below:
Y9414LB: Binding-head screw (M4, 14mm long)
Y9414EB: Flat-head screw (M4,14mm long)
If you wish to purchase the screws ...
Overview:
To change the voltage range on element 1 to 30 V, send the "CONFIGURE:VOLTAGE:RANGE 30V" command to the measuring instrument.To change the current range on element 1 to the 1 A range, send the "CONFIGURE:CURRENT:RANGE ...
Overview:
To change the voltage range on element 1 to 30 V, send the "CONFIGURE:VOLTAGE:RANGE:ELEMENT1 30V" command to the measuring instrument.To change the current range on element 1 to the 1 A range, send the ...
Overview:
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 ...
FAQ
Overview:
You can determine whether data was updated by performing a serial poll and referencing the status byte.Bit 0 of the status byte (D101) changes to 1 when data is updated. When bit 0 changes to 1, bit 6 (D107) also ...
Overview:
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 ...
Overview:
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, ...
Overview:
Send the "MEASURE:NORMAL:ITEM:PRESET:CLEAR" command to the measuring instrument. This command turns all items for output OFF. Therefore no items will be output if you send the "MEASURE:NORMAL:VALUE?" command.
Send the ...
Overview:
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 ...
Overview:
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 ...
Overview:
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 ...
Overview:
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 ...
Overview:
To change the voltage range on element 1 to the 30 V range, send the "RV4" command to the measuring instrument.To change the current range on element 1 to the 1 A range, send the "RA5" command to the measuring ...
Overview:
Send the "OFDO" command.This command turns all items for output OFF. Therefore no items will be output if you send the "OD" command.
Send the "OF1,1" command to the measuring instrument. This command turns the voltage ...
Overview:
The frequency display and D/A output can handle only one input element at a time, either the voltage or the current. When either the V Hz or A Hz display function indicators are lit in display C, the frequency ...
Overview:
NO, you should not use the instrument with both the direct input and external sensor terminals wired. Doing so will put the user at risk of electric shock and could damage the instrument. This is because the ...
Overview:
This error occurs when the PLL source frequency is outside of the measurement range. The measuring frequency range for the PLL source is 40 Hz to 440 Hz. You can select voltage or current for the PLL source. Select a ...
FAQ
Overview:
Yes, the setting values will be stored in internal memory if the instrument has firmware version 1.21 or later. You can check the version in the opening message when you first turn the power ON.
FAQ
Overview:
With RS232C, the response time depends on settings other than the communications speed. An actual measurement example is given below at 1 byte=10 bits (start bit: 1 bit, data: 8 bits, stop bit: 1 bit, no parity) with a ...
Overview:
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 1 (DAV) of this register. However to do ...
Overview:
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 ...
Overview:
Send the "MEASURE:ITEM:NORMAL:PRESET:CLEAR" command. This command turns all items for output OFF. Therefore no items will be output if you send the "MEASURE:VALUE?" command.
Send the "MEASURE:ITEM:NORMAL:V:ELEMENT1 ON" ...
Overview:
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 ...
FAQ
Overview:
To change the voltage range on element 1 to the 30 V range, send the "RV1,4" command to the measuring instrument. To change the current range on element 1 to the 1 A range, send the "RA1,5" command to the measuring ...
Overview:
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 ...
Overview:
Send the "OF1,1,1" commandThis command sets the voltage value (V) from element 1 to output to channel 1 (from among the 14 output channels), and causes the voltage of element 1 to be read out.
In the same manner, make ...
FAQ
Overview:
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 ...
Overview:
In the manual IM-WT1801-01EN, the following sentences are written. Fundamental Measurement ConditionsAll the settings for the fundamental measurement conditions for high speed data capturing are the same as those for ...
Overview:
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 ...
Overview:
What is the maximum size of ATA Flash Card we can use with the WT3000?
The maximum size of the card to save data is 16GByte.
The maximum size of the card used for firmware updating procss is limited to 256MByte.(A ...
Overview:
The WT1800 allows you the ability to create and load your own custom display for special application needs. You will not only be able to generate your own custom background but you will be able to change the displayed ...
Overview:
There are restrictions of the DSP hardware.
WT230 and WT210 are low-cost power meters.
So, a low-cost, modest performance DSP utilized.This DSP has slow calculation.
WT3000 is performing complicated ...
Overview:
It is possible to measure the phase difference by using the function φU1(1)-U2(1) in Hamonics Measurement Mode.In this mode, if the wiring pattern is set to 1P2W, the PZ4000 will display no value (----). It is ...
Overview:
The WT1800 and WT3000 series digital power analyzer offer two calculation methods, Type1 and Type3, for apparent and reactive power. Type1:The WT will first calculate the RMS voltage Urms, current Irms, and active ...
Overview:
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 ...
Overview:
To programmatically read all 500 harmonic orders measurement values, please use the ":NUMERIC:LIST" command set. The maximum number of items for the :NUMERIC:LIST:VALUE? command is 64. However, 1 LIST ITEM can ...
Overview:
The Urms and Umn values can be simultaneously read and retrieved using communication commands, only if the instrument is in WT300 IEE 488.2 mode. The WT300 has two communication command modes:IEE 488.2 in WT210/WT230 ...
Overview:
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 ...
Overview:
To measure inrush current on the WT1800, you will need to define and use the IPPEAKMAX() user defined function in combination with the Max Hold feature. A complete tutorial with instrument settings and how-to procedures ...
Overview:
To use USB interface on the WT500 and WT1800 from NI LabVIEW environment, you will need to use the USB driver from National Instruments. This USB driver is usually installed when you install NI-VISA and is called the ...
Overview:
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 ...
Overview:
The maximum response time during normal measurement is 0.5s, which is the display update interval x 2.
FAQ
Overview:
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 ...
Overview:
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 ...
Overview:
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 ...
Overview:
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 ...
Overview:
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 ...
Overview:
A quick and simple way of accessing the measurement data from a CSV file saved by the WT1800 is to use the MATLAB import wizard. In MATLAB, simply click on File > Import Data.... You can also use the MATLAB built-in ...
Overview:
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 ...
Overview:
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 ...
Overview:
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 ...
Overview:
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 ...
Overview:
The WT3000 enables users to save the waveform data via two methods: waveform displayed data, and waveform sampled data. The number of data points saved by the waveform displayed data method is compressed to a total ...
Overview:
The WTViewer Save Setting feature will only save the setting information of the WTViewer. The Save Setting feature will NOT save the setting information of the instrument. The saved file for the WT500, WT1800 or ...
Overview:
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 ...
Overview:
The specifications for the Type 2553 DC Voltage/Current Standard was changed on June 1982. The service manual was not rewritten to reflect these changes. There are two types of 2553:
1979/4 -- ...
Overview:
The output resolution of the D/A option for the WT100/WT200 series is 12-bits.
Overview:
Yes, if the instrument is in auto-range, zero level correction will still be executed.
Overview:
It is not necessary to specify the accuracy for PST values outside the range of 1.0, as any value larger than 1.0 is non-standard. The standard (IEC 61000-3-3) requires that the value of the short-term light ...
Overview:
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, ...
Overview:
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.
Overview:
The part numbers for the 2 piece screws in the WT210 Rack Mount Kit (751533-E2) are listed below:
Y9414LB: Binding-head screw (M4, 14mm long)
Y9414EB: Flat-head screw (M4,14mm long)
If you wish to purchase the screws ...
Overview:
There are no built-in over temperature protection devices in the WT3000. The official operating range covered by warranty is listed at 5°C - 40°C. Our own internal test have revealed that it is possible to ...
Overview:
The circuit design for the line filters used on the WT & PZ series instruments are similar to Butterworth filters but have been redesigned. We redesigned the original filtering characteristic to obtain a ...
Overview:
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 ...
Overview:
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.
Overview:
Unfortunately the WT3000 cannot display the RMS and DC values of voltage/current at the same time, even if you use the user-defined function feature. You must select either RMS or DC mode in the Voltage/Current Range ...
Overview:
Please refer to the attached Excel spreadsheet for complete information regarding the RS232 cable pinouts used with by the WT & PZ Series Power Analyzers.
Overview:
The Power Analyzer Accuracy and Basic Uncertainty Calculator can be used to determine the uncertainty in voltage, current, and active power (watts) measurement values for various frequency ranges and wiring systems.
Overview:
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 ...
Overview:
Yes, the WT210 will meet or exceed all requirements set by the Energy Star guideline. Please see the attached documents for more details.
Overview:
The IEC Harmonic analysis on the DL/DLM series oscilloscopes provides a rough analysis and estimation for harmonic testing. The scope will perform an FFT on the current waveform and can be used to measure the general ...
Overview:
The actual display update rate for the WT500 will depend on the input signal and the trigger setting. In addition, there may be a very small trigger delay (several milliseconds) if the input signal does not match the ...
FAQ
Overview:
"Zero level correction" is performed only when the setting initialization accompanies one of the following change.
Switching normal measurement/harmonics measurement.
Switching the voltage range.
Switching the current ...
Overview:
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 ...
Overview:
Please verify the following settings on the WT3000:
Wiring System set to 3P3W or 3V3A
ITEM set to φUi-Uj Element set to ΣA
ITEM set to φUi-UkWiring 3P4W or 3P3W(3V3A)Assign element 1,2, 3 to ΣA
Update rate is not too fast (
Overview:
If the HOLD button was pressed when the WT210 was powered OFF, it causes the WT210 to display "-----" on the next time it is powered ON. You can revert back to a numerical display simply press the HOLD button.
Overview:
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.
Overview:
"Error(Code:846): Attempted to start integration while measurement of peak overflow was in progress"The following error code will appear if Peak Over has occurred and you attempt to start integration. The WT3000 has two ...
Overview:
The optical resolution of the analog D/A option is 12-bits.
Overview:
The WT1000/WT2000 series instrument uses a BNC connector for the external shunt input terminal. The output terminal of the 751550 Clamp Probe is a banana plug. Please use the 366921 Banana-to-BNC Conversion Adapter to ...
Overview:
Yes, it is possible to alter the standard model WE7000. The following is a list of range standard special order specifications and correspond models.
Current Range 1/10 A Model: WT1010, WT1030, WT1030M, WT2010, ...
Overview:
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 ...
Overview:
If you want to know the condition of the "Check Range" LED indicator for voltage and current, you will need to read three bits in the Extended Event Register. "Bit-6", "Bit-7", and "Bit-8" needs to be read to know the ...
FAQ
Overview:
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 ...
Overview:
You can use the Power Viewer (Model 253734) software. However if you only need to view waveforms, we recommend you use the Waveform Viewer (Model 700919, version 1.23 or later) software.
The trial version of the Power ...
Overview:
Selecting formulas for calculating apparent power and reactive powerThere are several types of power—active power, reactive power, and apparent power. Generally, the following equations are satisfied:Active power P = ...
Overview:
Yes, the AUX inputs on the WT1800 can be used in the Math functions.
For example, if you wanted to measure a DC bus input using the AUX inputs (input elements not connected), you would scale one of the AUX inputs to ...
Overview:
The output resolution for the WT3000 is 16-bits.
Overview:
The actual display update rate is shown below for observation times from 2 ms to 100 ms.
2 ms : 0.8 s
4 ms : 0.9 s
10 ms : 1.2 s
20 ms : 1.8 s
40 ms : 1.8 s
100 ms : 1.8 s
Measurement Conditions
Modules mounted : ...
Overview:
Although Yokogawa does not have any official recommendation for USB to Serial converters, it is possible to use some USB to RS232 DB9 Adapter Cables. If you choose to use a laptop PC without RS232C port, please use ...
Overview:
When the selected data update cycle of the fundamental wave is shorter than the width of the analysis window determined by the fundamental frequency (cycle of the fundamental wave), measurement is not performed and no ...
Overview:
The D/A output of the WT230 uses a 24-Pin Centronics type connector. For additional informating regarding the 24-Pin Centronics Connector, please refer to the attached PDF and click on the link below.
Overview:
Please download the attached PDF file for a list of pinouts for various communication cables.
Overview:
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 ...
Overview:
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
FAQ
Overview:
When making a WT230 RS232C connection using GateWT, please verify the following RS232C communication settings on the instrument: Mode = 488.2 Hand = 0 For = 0 Baud Rate = 9600 Terminator Cr+Lf Even though you can run ...
Overview:
You can read the average active power during continuous integration mode (just before the integral resets) for the WT230, by monitoring the status of the ITG or ITM bits of the extended event register.
Bit 1 ITG is ...
Overview:
Yes, you can use DL Term with the WT1800 using an Ethernet (VXI-11) or USB connection.
Overview:
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 ...
FAQ
Overview:
To use the WT3000 with the Flicker Software, the WT3000 must have the following options:
/G6 option - Advanced Calculations
/FL option - Flicker Measurements
1 to 3 elements - 30A Input Module
Note: The 2A input ...
Overview:
Yes, please contact your nearest Yokogawa representative for more details.
Overview:
It is possible to lock out all the keys, including LOCAL, on the WT210/WT230 using a GPIB specific or controller specific command.For the GPIB controller from National Instruments, the command is called LLO or Local ...
Overview:
No, it is not possible to change the maximum number of harmonic orders when calculating THD. On the WT210/WT230, the THD values are calculated based on 50 orders. To calculate THD on the WT210/WT230, there are two ...
Overview:
Yes, the AUX inputs on the WT1800 can be used in the Math functions.
For example, if you wanted to measure a DC bus input using the AUX inputs (input elements not connected), you would scale one of the AUX inputs to ...
FAQ
Overview:
When making a WT230 RS232C connection using GateWT, please verify the following RS232C communication settings on the instrument: Mode = 488.2 Hand = 0 For = 0 Baud Rate = 9600 Terminator Cr+Lf Even though you can run ...
Overview:
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
Overview:
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 ...
Overview:
The D/A output of the WT230 uses a 24-Pin Centronics type connector. For additional informating regarding the 24-Pin Centronics Connector, please refer to the attached PDF and click on the link below.
Overview:
Yes, you can use DL Term with the WT1800 using an Ethernet (VXI-11) or USB connection.
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You can read the average active power during continuous integration mode (just before the integral resets) for the WT230, by monitoring the status of the ITG or ITM bits of the extended event register.
Bit 1 ITG is ...
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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 ...
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It is possible to lock out all the keys, including LOCAL, on the WT210/WT230 using a GPIB specific or controller specific command.For the GPIB controller from National Instruments, the command is called LLO or Local ...
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No, it is not possible to change the maximum number of harmonic orders when calculating THD. On the WT210/WT230, the THD values are calculated based on 50 orders. To calculate THD on the WT210/WT230, there are two ...
FAQ
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To use the WT3000 with the Flicker Software, the WT3000 must have the following options:
/G6 option - Advanced Calculations
/FL option - Flicker Measurements
1 to 3 elements - 30A Input Module
Note: The 2A input ...
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Yes, please contact your nearest Yokogawa representative for more details.
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Please download the attached PDF file for a list of pinouts for various communication cables.
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Although Yokogawa does not have any official recommendation for USB to Serial converters, it is possible to use some USB to RS232 DB9 Adapter Cables. If you choose to use a laptop PC without RS232C port, please use ...
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If you want to know the condition of the "Check Range" LED indicator for voltage and current, you will need to read three bits in the Extended Event Register. "Bit-6", "Bit-7", and "Bit-8" needs to be read to know the ...
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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 ...
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Yes, it is possible to alter the standard model WE7000. The following is a list of range standard special order specifications and correspond models.
Current Range 1/10 A Model: WT1010, WT1030, WT1030M, WT2010, ...
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The optical resolution of the analog D/A option is 12-bits.
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The WT1000/WT2000 series instrument uses a BNC connector for the external shunt input terminal. The output terminal of the 751550 Clamp Probe is a banana plug. Please use the 366921 Banana-to-BNC Conversion Adapter to ...
FAQ
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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 ...
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You can use the Power Viewer (Model 253734) software. However if you only need to view waveforms, we recommend you use the Waveform Viewer (Model 700919, version 1.23 or later) software.
The trial version of the Power ...
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The actual display update rate is shown below for observation times from 2 ms to 100 ms.
2 ms : 0.8 s
4 ms : 0.9 s
10 ms : 1.2 s
20 ms : 1.8 s
40 ms : 1.8 s
100 ms : 1.8 s
Measurement Conditions
Modules mounted : ...
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The output resolution for the WT3000 is 16-bits.
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When the selected data update cycle of the fundamental wave is shorter than the width of the analysis window determined by the fundamental frequency (cycle of the fundamental wave), measurement is not performed and no ...
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Selecting formulas for calculating apparent power and reactive powerThere are several types of power—active power, reactive power, and apparent power. Generally, the following equations are satisfied:Active power P = ...
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The output resolution of the D/A option for the WT100/WT200 series is 12-bits.
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The maximum response time during normal measurement is 0.5s, which is the display update interval x 2.
FAQ
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With RS232C, the response time depends on settings other than the communications speed. An actual measurement example is given below at 1 byte=10 bits (start bit: 1 bit, data: 8 bits, stop bit: 1 bit, no parity) with a ...
FAQ
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Yes, the setting values will be stored in internal memory if the instrument has firmware version 1.21 or later. You can check the version in the opening message when you first turn the power ON.
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This error occurs when the PLL source frequency is outside of the measurement range. The measuring frequency range for the PLL source is 40 Hz to 440 Hz. You can select voltage or current for the PLL source. Select a ...
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The frequency display and D/A output can handle only one input element at a time, either the voltage or the current. When either the V Hz or A Hz display function indicators are lit in display C, the frequency ...
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NO, you should not use the instrument with both the direct input and external sensor terminals wired. Doing so will put the user at risk of electric shock and could damage the instrument. This is because the ...
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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 1 (DAV) of this register. However to do ...
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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 ...
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Send the "OFDO" command.This command turns all items for output OFF. Therefore no items will be output if you send the "OD" command.
Send the "OF1,1" command to the measuring instrument. This command turns the voltage ...
FAQ
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To change the voltage range on element 1 to the 30 V range, send the "RV1,4" command to the measuring instrument. To change the current range on element 1 to the 1 A range, send the "RA1,5" command to the measuring ...
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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 ...
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Send the "MEASURE:ITEM:NORMAL:PRESET:CLEAR" command. This command turns all items for output OFF. Therefore no items will be output if you send the "MEASURE:VALUE?" command.
Send the "MEASURE:ITEM:NORMAL:V:ELEMENT1 ON" ...
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Send the "OF1,1,1" commandThis command sets the voltage value (V) from element 1 to output to channel 1 (from among the 14 output channels), and causes the voltage of element 1 to be read out.
In the same manner, make ...
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Send the "MEASURE:NORMAL:ITEM:PRESET:CLEAR" command to the measuring instrument. This command turns all items for output OFF. Therefore no items will be output if you send the "MEASURE:NORMAL:VALUE?" command.
Send the ...
FAQ
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You can determine whether data was updated by performing a serial poll and referencing the status byte.Bit 0 of the status byte (D101) changes to 1 when data is updated. When bit 0 changes to 1, bit 6 (D107) also ...
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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 ...
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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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To change the voltage range on element 1 to 30 V, send the "CONFIGURE: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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To change the voltage range on element 1 to 30 V, send the "CONFIGURE:VOLTAGE:RANGE 30V" command to the measuring instrument.To change the current range on element 1 to the 1 A range, send the "CONFIGURE:CURRENT:RANGE ...
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To change the voltage range on element 1 to the 30 V range, send the "RV4" command to the measuring instrument.To change the current range on element 1 to the 1 A range, send the "RA5" command to the measuring ...
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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 ...
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
FAQ
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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 ...
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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 ...
FAQ
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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A quick and simple way of accessing the measurement data from a CSV file saved by the WT1800 is to use the MATLAB import wizard. In MATLAB, simply click on File > Import Data.... You can also use the MATLAB built-in ...
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To use USB interface on the WT500 and WT1800 from NI LabVIEW environment, you will need to use the USB driver from National Instruments. This USB driver is usually installed when you install NI-VISA and is called the ...
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To measure inrush current on the WT1800, you will need to define and use the IPPEAKMAX() user defined function in combination with the Max Hold feature. A complete tutorial with instrument settings and how-to procedures ...
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There are restrictions of the DSP hardware.
WT230 and WT210 are low-cost power meters.
So, a low-cost, modest performance DSP utilized.This DSP has slow calculation.
WT3000 is performing complicated ...
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The WT1800 allows you the ability to create and load your own custom display for special application needs. You will not only be able to generate your own custom background but you will be able to change the displayed ...
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What is the maximum size of ATA Flash Card we can use with the WT3000?
The maximum size of the card to save data is 16GByte.
The maximum size of the card used for firmware updating procss is limited to 256MByte.(A ...
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The WT3000 enables users to save the waveform data via two methods: waveform displayed data, and waveform sampled data. The number of data points saved by the waveform displayed data method is compressed to a total ...
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In the manual IM-WT1801-01EN, the following sentences are written. Fundamental Measurement ConditionsAll the settings for the fundamental measurement conditions for high speed data capturing are the same as those for ...
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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 ...
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It is possible to measure the phase difference by using the function φU1(1)-U2(1) in Hamonics Measurement Mode.In this mode, if the wiring pattern is set to 1P2W, the PZ4000 will display no value (----). It is ...
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The WT1800 and WT3000 series digital power analyzer offer two calculation methods, Type1 and Type3, for apparent and reactive power. Type1:The WT will first calculate the RMS voltage Urms, current Irms, and active ...
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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 ...
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The Urms and Umn values can be simultaneously read and retrieved using communication commands, only if the instrument is in WT300 IEE 488.2 mode. The WT300 has two communication command modes:IEE 488.2 in WT210/WT230 ...
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To programmatically read all 500 harmonic orders measurement values, please use the ":NUMERIC:LIST" command set. The maximum number of items for the :NUMERIC:LIST:VALUE? command is 64. However, 1 LIST ITEM can ...
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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 ...
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Yes, the WT210 will meet or exceed all requirements set by the Energy Star guideline. Please see the attached documents for more details.
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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 ...
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The Power Analyzer Accuracy and Basic Uncertainty Calculator can be used to determine the uncertainty in voltage, current, and active power (watts) measurement values for various frequency ranges and wiring systems.
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Unfortunately the WT3000 cannot display the RMS and DC values of voltage/current at the same time, even if you use the user-defined function feature. You must select either RMS or DC mode in the Voltage/Current Range ...
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Please refer to the attached Excel spreadsheet for complete information regarding the RS232 cable pinouts used with by the WT & PZ Series Power Analyzers.
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The IEC Harmonic analysis on the DL/DLM series oscilloscopes provides a rough analysis and estimation for harmonic testing. The scope will perform an FFT on the current waveform and can be used to measure the general ...
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The actual display update rate for the WT500 will depend on the input signal and the trigger setting. In addition, there may be a very small trigger delay (several milliseconds) if the input signal does not match the ...
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If the HOLD button was pressed when the WT210 was powered OFF, it causes the WT210 to display "-----" on the next time it is powered ON. You can revert back to a numerical display simply press the HOLD button.
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Please verify the following settings on the WT3000:
Wiring System set to 3P3W or 3V3A
ITEM set to φUi-Uj Element set to ΣA
ITEM set to φUi-UkWiring 3P4W or 3P3W(3V3A)Assign element 1,2, 3 to ΣA
Update rate is not too fast (
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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 ...
FAQ
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"Zero level correction" is performed only when the setting initialization accompanies one of the following change.
Switching normal measurement/harmonics measurement.
Switching the voltage range.
Switching the current ...
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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.
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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 ...
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Yes, if the instrument is in auto-range, zero level correction will still be executed.
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The impedance of the 366924 and the 366925 BNC cable is 50 Ω.
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Can Xviewer.exe be run as multiple instance?
No - not at this time.
Xviewer can not control two or more DL850 chassis.
Xviewer can not connect to two or more instruments at the same time.
Two or more Xviewer ...
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When using WTViewerFree to automatically save data in CSV format, a lack of memory may occur due to increasing load on anti-virus software such as Virus Buster. As the data save time becomes longer, the CSV file will ...
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The following softwares have been tested for Windows 7 compatibility.
WTViewer
Xviewer
SL1000 Acquisition Software
USB Instrument Drivers for all USB supported instruments
TMCTL Library Files for programming with VB, ...
Industries:
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This comprehensive training module covers the following topics:
- Introduction & Product Familiarization
- Basic System & Wiring Configurations
- Basic Setup and Operating Features
- Step-by-Step Video Demonstrations of Features
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This comprehensive training module covers the following topics:
- Introduction & Product Familiarization
- Basic Setup, System & Wiring Configurations
- Basic and Advanced Analysis Features
Product Overviews
Webinars
Overview:
Yokogawa and e-Drive Magazine are bringing you a one hour webinar on November 17, 2011 at 11:00am EST. This seminar will provide attendees with a three step process for making precision electrical and mechanical power measurements on AC motors and variable speed drive systems in order to measure and calculate the system power efficiency.
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In this webinar, Yokogawa's Bill Gatheridge educates and provides attendees with practical solutions for making precision electrical power measurements. He also covers the use of a digital power analyzer, as well as the DO's and DON'Ts of using a digital oscilloscope for making electrical power measurements.
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In this one-hour webinar, you will learn a three-step process for a complete electrical test of an AC motor & variable-speed drive system.
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In this one-hour webinar you will learn about voltage and current harmonics. Specifically, you will learn how to measure and characterize this type of waveform distortion, and how it can affect your power system.