Atec WT3000 User Manual
Precision Power Analyzer WT3000
WT3000
Precision Power Analyzer
High-end Power Meter with top precision*
Basic Power Accuracy: 0.02% of reading
Basic Accuracy
Basic Power Accuracy
Good Readability
Simultaneous Measurement with 2 Units (8 Power Input Elements)
Store Function
Interface
Advanced Computation Function
IEC61000-3-2
IEC61000-3-3
* As of July, 2013, for power meter accuracy in three-phase power meter (as investigated by Yokogawa).
0.01% of reading
0.02% of reading
The Large, 8.4-inch LCD and the Range Indicator LEDs
50 ms Data Storing Interval
GP-IB, Ethernet, RS-232 and USB
Waveform Computation, FFT Analysis, Waveform sampling Data Saving
Harmonic Measurement
Voltage Fluctuation/ Flicker Measurement
www.yokogawa.com/tm/
(WT3000)
Bulletin 7603-00E
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Precision Power Analyzer WT3000
Yokogawa’ s po wer measurement technology provides best-in-class
*1
precision and stability
APEX
Basic
Power
Accuracy:
±0.02%
With basic power accuracy of ± 0.02% of reading, DC and 0.1
Hz–1 MHz measurement bandwidths, and up to four input elements,
the WT3000 provides higher-accuracy measurement for inverter I/O efficiency.
More Precise. More Bandwidth. More Features.
• The WT3000 is a truly innovative measurement solution, combining top-level measurement accuracy
with special functions.
• The large, 8.4-inch liquid crystal display and the range indicator LEDs ensure good readability and
make the system easy to use.
The WT3000 is the answer to your measurement prob lems.
Have you had problems or questions such as these?
• When working with efficiency-improvement evaluation data for a high-efficiency motor, improvements cannot be seen
unless measurements are taken with very high precision.
• Measurement efficiency is poor during power measurements and power supply quality measurements.
For answers to these questions, see page 6.
Features
Standard feature
Option
Software (sold separately)
2
2
Voltage
range
Normal
harmonics
DAoutput
*2
Current
range
Wideband
harmonics
VGA
External
harmonics
sensor
range
IEC
Comm
Frequency
power
range
FET
computation
Comm
Inputs
4 input
elements
Waveform
computation
Comm
Basic
Power
Accuracy
Sampling
data saving
Comm
USB
Crest
factor
Cycle Fricker
Software
Display
Software Software
Data
updating
interval
As fast as
50 ms
PCcard
slot
Delta
calculation
Internal
Memory
Frequency
measurement
USB
memory
*2
Motor
evaluation
Printer
Better Efficiency in Power Measurements
In developing the WT3000, Yokogawa focused on improving
efficiency in two basic areas. One goal was to obtain highly
precise and simultaneous measurements of the power
conversion efficiency of a piece of equipment. The other
objective was to improve equipment evaluation efficiency by
making simultaneous power evaluations and tests easier
and faster.
New Innovations to Enhance the Reliable
Measurement Tec hnology
With the WT3000, we made further improvements to the
basic performance specifications for even better functionality
and reliability. We are confident users will appreciate these
improvements to power and efficiency measurements
thanks to the new power control technologies we have
introduced.
A Variety of External Interface Choices
The WT3000 equips with a PC card
slot (ATA flash card slot). The
WT3000 is also standard-equipped
with a GP-IB port. In addition, a
serial (RS-232) port, Ethernet port,
USB port for peripheral, and USB
port for connection to PC are
available as options. The variety of
interface choices allows customers to
use the best interfaces for a wide
variety of equipment, media, and
network environments.
Select the model
most suited to your
measurement needs.
Standard Version
夹High Accuracy and Wide Frequency Range
Basic Power Accuracy
±(0.02% of reading + 0.04% of range)
Frequency Range
DC, 0.1 Hz to 1 MHz
夹Low Power Factor Error
Power factor influence when cosø=0
0.03% of S
S is reading value of apparent power
ø is phase angle between voltage and current
夹Current Range
Direct Input
0.5/1/2/5/10/20/30 [A] *
5m/10m/20m/50m/100m/200m/500m/1/2 [A] *
External Input
50m/100m/200m/500m/1/2/5/10 [V] *
夹Voltage Range
15/30/60/100/150/300/600/1000 [V] *
*Voltage range and current range are for crest factor 3
夹Continuous Maximum Common Mode
Voltage (50/60 Hz)
1000 [Vrms]
夹Data Update rate: 50 ms to 20 sec
夹Effective input range: 1% to 130%
夹Simultaneous measurement with 2 Units
夹Standard PC Card Slot
夹Storage Function (Approximately 30MB
internal memory)
Yokogawa’s highest-precision power meter
The WT3000 has the highest precision of the Yokogawa power
meters in the WT Series. The models in the WT Series are
designed to meet a wide variety of user needs. The WT300
Series is a high price-performance series which is very popular
in production line applications. The WT1800 allows
measurement data to be viewed in a variety of ways, including
numerical value display, waveform display, and trend display
capabilities.
WT3000
±0.02%
WT1800
±0.10%
WT300
±0.10%
*reading error
*2
Motor Version
In addition to the functions of the standard version, the
models offer powerful motor/inverter evaluation
functions.
夹Motor Efficiency and Total Efficiency
Measurement
Analog or pulse signal from
rotating sensor and torque
meter can be input, and
allows calculation of torque,
revolution speed,
mechanical power,
synchronous speed, slip,
motor efficiency, and total
efficiency in a single unit.
*1 As of July, 2013, for power accuracy in a three-phase power meter
(as investigated by Yokogawa)
*2 As compared to Yokogawa’s products
3
3
Precision Power Analyzer WT3000
FUNCTIONS
䉴 WT3000 Controls:
Simple to Use, Easy to View
The WT3000 was designed with user-friendly functions and controls
in response to user requests for a simpler range setting operation
and more user-friendly parameter setting display process.
Simpler range settings
Range settings using direct key input
The range indicator on the WT3000 is a seven-segment green LED, so the set
range can be monitored at all times. The range can easily be switched using the up
and down arrows.
Item pages make it easy to set the data you want to view for each experiment
Using item pages to set display preferences
The WT3000 has nine numeric item pages for displaying measurement values.
Once you set the measurement parameters you want displayed on a particular
item page, you can easily switch between entire groups of displayed parameters.
䉴 A wide range of standard functions
Formats for viewing waveforms as well as numerical values
A Variety of display formats
The WT3000 lets you display input signal waveforms in addition to numerical value
data. This means you don’t need to connect a special waveform analyzer just to
check signal waveforms.
In addition, the optional advanced computation function lets you display vectors
and bar graphs for
enhanced visual
presentation.
*1 Waveforms up to
approximately
10 kHz can be displayed
accurately.
*2 Excludes single phase model.
High-speed measurement to capture rapid data fluctuations
*1
Trend display
Vector display
*2
50ms data updating intervals
Fast updating allows you to precisely capture rapidly changing transient states in
the measurement subject.
* The WT3000 switches between two different calculation systems depending on
the data updating interval. See page 19 for details.
Compensates for the loss
Compensation functions
This function compensates for the loss caused by the wiring of each element. The
WT3000 has the following three types of correction functions to measure the
power and efficiency.
• Wiring Compensation
This function compensates for the loss caused by the wiring of each element.
• Efficiency Compensation
The power measurement on the secondary side of a power transformer such as
an inverter includes loss caused by the measurement instrument. This loss
appears as error in the efficiency computation. This function compensates for this
loss.
• Compensation for the Two-Wattmeter Method*
In the two-power wattmeter method, an error results when current flows through
the neutral line. This function computes the currents that flows through the
neutral line for measurements using the two-wattmeter method with a threephase, three wire (3V3A) system and adds the compensation value to the
measured power. *Requires the delta computation option (/DT).
Storing measurement data*
Store Function
Voltage, current, power, and other measured data can be stored to the unit’s
approximately thirty megabytes of internal memory. These data can be saved in
binary or ASCII format on a PC card or USB memory *. *requires the /C5 option
A way to add user-defined measurement parameters
User-defined function
As many as twenty user-defined formulas can be set in the WT3000. These
equations can be used to calculate various parameters, such as mean active
power (see “A variety of integration functions” below).
An easier way to input efficiency calculation formulas
Efficiency calculation function
This function can be used to set up to four efficiency calculation formulas.
Apparent power integration and reactive power integration
A Variety of integration functions
• Active power, current, apparent power, reactive power
In addition to the active power integration function (WP) and current integration
function (q) included in earlier models, the WT3000 also has a new apparent
power integration function (WS) and reactive power integration function (WQ).
•A wide effective input range for high-precision integration
The WT3000 has a wide effective input range, from 1% to 130% of the
measurement range.
•Average active power (using user-defined settings)
Average active power can be calculated over an integration interval. This feature
is useful for evaluating the power consumed by intermittent-control instruments in
which the power value fluctuates.
Average active power =
Power value
Easily switch between multiple item pages
Integrated power (WP)
Integrated elapsed time (H)
Instantaneous power value
Time
Average active power value
4
4
OPTIONS
䉴 A wide variety of optional functions make it easy to perform
sophisticated power evaluations.
When you purchase a WT3000 from Yokogawa, you get to select just the options you need. This approach lets
you maximize performance at a lower cost.
Checking harmonic components and total harmonic distortion (THD)
Advanced Computation (/G6)
The advanced calculation function (/G6 option) meets these measuring needs with
advanced, powerful features for making power analysis measurements more efficient.
• Harmonic Measurement in Normal Measurement Mode
You can measure harmonic data while in normal measurement mode. This is effective
for observing values from normal measurements and harmonic data at the same time.
• Wide Bandwidth Harmonic Measurement
This dedicated harmonic measurement function is distinct from the harmonic
measurements that can be taken in normal measurement mode. The function is
useful for ascertaining the distortion factor and harmonic components in strain
measurements of fundamental frequencies from 0.1 Hz to 2.6 kHz. It allows wide
bandwidth measurements of signals that include high frequency waves, such as from
power supplies and acceleration of motor revolution.
• Waveform Computation
You can perform computations on measured waveforms, and display power
(instantaneous voltage × instantaneous current) and other waveforms on screen.
• FFT
You can analyze and display a waveform’s individual frequency components. You can
also check signal components other than the integer multiples of the fundamental wave.
• Waveform Sampling Data Saving
You can save sampling data of input waveforms, waveform computations, and FFT
computations. The data is available for any kind of computation by PC software.
Output graphics at the touch of a button
Built-in printer (/B5)
The optional built-in printer is installed on the
front side of the WT3000, so it is easy to use
even if the WT3000 is mounted on a rack. The
printer can be used to print data and waveform
memos.
Capturing cycle-by-cycle fluctuations
Cycle by Cycle Measurement (/CC)
The function takes measurements of
parameters such as voltage, current, and active
power for each cycle, then lists the data on
screen in a time series. Input frequencies from
0.1 Hz to 1000 Hz can be measured. Up to
3000 data can be saved in CSV format. Also,
with the WTViewer software (model 760122,
sold separately), data can be displayed in
graphs by cycle.
Measurement data display
Checking the frequencies of all inputs
Added Frequency Measurement (/FQ)
In addition to the standard two channels of frequency measurement, a six-channel
frequency measurement option is also available. This option provides frequency
measurement of voltage and current on all eight channels (with input elements 1
Input signal and FFT data Input signal and power waveform
Performing IEC harmonic standards tests
IEC harmonic measurement mode (/G6)
Harmonic measurement software* can be used in this dedicated mode for harmonic
measurement that supports international standards. This allows confirmation of
whether or not home electronics, office automation equipment, or other devices
conform with harmonic standards.
* IEC standard compliant harmonic measurement requires the model 761922 harmonic
measurement software.
Voltage Fluctuation and Flicker Measurement (/FL)
Enables voltage fluctuation/flicker measurement conforming to IEC61000-3-3.
The following values related to voltage fluctuation that are stipulated by the IEC610003-3 standard can be calculated from the measured data: dc (relative steady-state
voltage change), dmax (maximum relative voltage change), dt (relative voltage
change time), short-term flicker value Pst, long-term flicker value Plt, instantaneous
flicker sensation, and others. In this mode, you can judge whether voltage fluctuations
in the item under test relative to a specified minimum value are within the standard.
* The flicker test can also be performed with the WT3000 alone. Using the model 761922
harmonic/flicker measurement software (sold separately), you can display trend graphs,
CPF graphs, or reports of the dc, dmax, and IFS (instantaneous flicker sensation) values
in addition to the WT3000 judgment results.
Checking phase voltage when you measure line voltage
Delta Calculation (/DT)
This function allows you to calculate individual phase
voltages from the line voltage measured in a three-phase,
three-wire (3V3A) system. R-S line voltage can be
calculated in systems measured from a three-phase,
three-wire method (using two elements).
This is useful when you want to determine the phase
voltage in motors and other items under test with no
neutral lines.
Note: This function cannot be used for products with only one
element.
Note: When taking measurements that incorporate measuring instrument options, certain functions, displays, and measuring functions may be limited depending on the measurement mode.
For example, waveform and FFT computations may not be used simultaneously.
T phase
R phase
S phase
through 4 installed). This is necessary when you want to measure voltage and
current frequency from the instrument’s I/O as well as voltage and current frequencies
of multiple items under test at the same time.
Outputting measurement values as analog signals
D/A Output (/DA)
• 20 Channels
Measured values and calculated value by user-defined function can be output as ± 5V
FS DC voltages from the D/A output connector on the rear panel.
• D/A zoom
This function allows the any input signal range to be scaled to between -5V and 5V* in
the D/A output as Upper and Lower ranges. This makes it possible to enlarge input signal
fluctuations for observation using a recorder or logger.
* The range is 0V to 5V for some functions, such as frequency measurement.
Video output for viewing on a larger screen
VGA output (/V1)
The VGA port can be used to connect an external monitor in order to view numerical
value data and waveforms on a larger screen. This capability is useful if you want to
simultaneously check large amounts of data on a separate screen, or view data in a
separate location.
USB Port (Peripheral) Option (/C5)
You can save voltage, current, power, and other kinds of data that are stored in the
WT3000 to a USB Memory. The data can be saved in binary or ASCII format. You
can also connect a keyboard for easy input of user-defined math expressions.
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Precision Power Analyzer WT3000
Variety of Communication Functions (GP-IB Comes Standard)
USB Port (PC) Option (/C12)
The USB port (type B connector) on the rear panel of the WT3000 allows data
communications with a PC
1. USB driver required for USB communications. A USB driver is available from our Web
site.
1
.
Serial (RS-232) (/C2)
* Select USBport (PC) or RS-232
* Select USBport (PC) or RS-232
Ethernet port (/C7)
The optional Ethernet port (100BASE-TX/10BASE-T) allows you to connect the
WT3000 to a LAN. Once connected, images and numerical value data saved on the
WT3000 can be transferred to a PC using FTP server software or other utilities.
APPLICATIONS
Measurement Applications to Utilize WT3000’s Capabilities
Measurement of Inverter Efficiency
• Measuring Efficiency with High Precision:
Simultaneous Measurement of Input and Output
The WT3000 offers up to four input elements capable of simultaneous measurement
of single-phase input/three-phase output, or three-phase input/three-phase output.
• Accurate Measurement of Fundamental PWM Voltage
Motor drive technology has become more complex in recent years; pure sinewavemodulated PWM is less common, and cases in which the voltage mean differs greatly
from the fundamental voltage waveform arise frequently. With the optional harmonic
measurement function of the WT3000, accurate measurements of commonly
measured values such as active power and the fundamental or harmonic
components can be taken simultaneously without changing measuring modes.
• Phase Voltage Measurement without a Neutral Line (/DT option)
With the delta computation function, an object under test without a neutral line can be
measured in a three-phase three-wire (3V3A) configuration, allowing calculation of
each phase voltage.
•High Frequency and Harmonic Measurements
(Requires the /G6 Option)
The fundamental frequencies of motors have become faster and faster. The WT3000
allows harmonic measurements of signals with fundamental frequencies as high as
2.6 kHz.
• Evaluation of Torque Speed Characteristics
(Requires motor version, the /CC Option)
Torque speed can be evaluated based on the torque and revolution speed data
measured with the motor version. Also, you can confirm the cycle-by-cycle voltage,
current, and power fluctuations that occur such as when starting the motor.
inverter motor load
input signal
output signal
You can take measurements in excess of 30 A by using a 2 A input element together with the model
751574* current transducer.
*See page 10 of the specifications.
When measuring three-phase input/three-phase output with a three-phase four-wire system, you can
measure input and output simultaneously by synchronizing between two units.
torque
and
speed meter
trend display of torque and rpms
(requires motor version)
• Related applications
Power conversion technologies such as those used in EVs and power
conditioners
High-precision, simultaneous measurements are required in measuring
conversion efficiency in the conversion of a converter's three-phase input to a DC
bus, and the conversion from an inverter's DC bus to three-phase output.
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