Digital Power Meter WT300 (DISCONTINUED)
The WT300 series of digital power meters are the fifth generation of Yokogawa's best-selling compact power meters: instruments that play a key part in ensuring optimum standards of energy efficiency and conservation by measuring the power consumption of electrical equipment. Combining accurate and reliable power measurement over a wide power range with flexibility, ease of use and a choice of communication interfaces, these instruments will help developers, engineers and manufacturers of electrical equipment to ensure that their products comply with emerging IEC and EN standards and increasingly complex and stringent specifications on energy efficiency. They provide ideal measurment solutions for various applications ranging from stand by power measurement to Energy star for various manufacturers such as domestic "white goods", battery chargers, lighting systems.
The WT300's wide range of funcations and enhanced specifications allows to handle all the measurement applications from low-frequency to high frequency inverters using a single power meter.
Accuracy with fast display and update rate:
The WT300 series with the fast display and date update rate of Max. 100ms offers the customer a short tact time in their testing procedure. The basic accuracy for all input ranges is 0.1% rdg + 0.1% rng (50/60Hz) and DC 0.1% rdg + 0.2% rng (0.2% + 0.2% for 40A).
Simultaneous Measurement:
U/I/P/Freq/Integ(+/-)/Harmonics components/ THD with max. 100ms cycle.
In addition to standard power measurements, the WT300 offer a wide range of harmonic measurement capabilities, including the ability to carry out simultaneous measurement of normal power parameters such as RMS, mean or DC power along with measurement of harmonics up to the 50th order. As a result, overall measurement times are reduced, allowing users to allocate their effort and time to other tasks.
First in Class:
Auto ranging function available in selected ranges.
The auto-range function is used to select or change the range automatically in specific ranges. This results in shorter range changing times, allowing more quick and efficient testing.
First in Industry:
Auto Ranging Function For Integration Measurement.
Typically, when power meters operate in an integration mode to measure power consumption and standby power, the measuring ranges need to be fixed. However, if the level of the input exceeds the maximum of the selected range, the test will need to be repeated. The WT300 Series has a high speed automatic ranging capability in integration mode, which removes the need to repeat any test.
Bandwidth: DC and 0.5Hz to 100 kHz (WT310HC is up to 20 kHz for 40A).
Direct Input: Maximum direct input up to 600V and 20A, or 40A (incase of WT310HC). The wide current input range gives the customer options to use the WT300 series from as low as 50 micro-Amps to 40Arms.
High-speed data update (up to 10 readings per second.)
Comparison of WT210/230 with WT310/330
| WT310/WT332/WT333 | WT310HC | WT210/WT230 | ||
| DC power measurement accuracy | 0.1% of reading+0.2% of range | 0.3% of reading+0.2% of range | 0.3% of reading+0.2% of range | |
| Current range (Crest factor=3)Voltage and current basic accuracy |
Direct Input | 5m/10m/20m/50m/100m/200m/ 0.5/1/2/5/10/20[A]（WT310）0.5/1/2/5/10/20[A]（WT332/WT333） |
1/2/5/10/20/40[A] | 5m/10m/20m/50m/100m/200m/ |
| External current input | EX1: 2.5/5/10[V] EX2: 50m/100m/200m/500m /1/2[V] (OP.) |
EX1: 2.5/5/10[V] EX2: 50m/100m/200m/500m /1/2[V] (OP.) |
EX1: 2.5/5/10[V] EX2: 50m/100m/200m[V] (OP.) |
|
| Effective input range for voltage & current (CF=3) | 1% to 130% | 1% to 100% (40A range only) | 1% to 130% | |
| Maximum displaying value for voltage & current (CF=3) | 1% to 140% | 1% to 110% (40A range only) | 1% to 140% | |
| Effect of Power Factor (CF=3) | 0 | Power reading x {power reading error + (power range / apparent power reading) + tanφ x (influence when PF = 0)} % | Power reading x {power reading error + (power range / apparent power reading) + tanφ x (influence when PF = 0)} % | Add the power reading x {tanφ x (influence when PF = 0)}%. |
| Simultaneous measurement of RMS, Voltage MEAN & DC | Yes | Yes | No | |
| Frequency measurement | 2 channels (voltage & current) | 2 channels (voltage & current) | selected voltage or current (one) | |
| Number of display items | 4 items | 4 items | 3 items | |
| Sampling rate | Approximately 100 kS/s | Approximately 100 kS/s | Approximately 50 kS/s | |
| Harmonic measurement | Yes (OP, /G5) | Yes (OP, /G5) | Yes (OP, /HRM) | |
| THD calculation maximum order setting | Yes (OP, 1-50th) | Yes (OP, 1-50th) | No | |
| Auto ranging of integration | Yes | Yes | No | |
| Communication interface | USB | Yes | Yes | NO |
| GP-IB | Yes GP-IB or RS-232 | Yes GP-IB or RS-232 | Yes (OP) GP-IB or RS-232C | |
| RS-232 | Yes RS-232 or GP-IB | Yes RS-232 or GP-IB | Yes RS-232 or GP-IB | |
| Ethernet | Yes (OP) | Yes (OP) | NO | |
| IEEE standard for GP-IB | IEEE488.2 | IEEE488.2 | IEEE488.1 and IEEE4882. | |
| Comparator function | No | No | Yes | |
| Viewer software | Free (included) | Free (included) | Free (download) | |
Wide current input range
- Wide current input ranges: The WT300 series offers a wide range of current inputs from a few mA t
- Simultaneous measurement of all parameters: The WT300 can measure all DC and AC parameters. The WT300 series can also measure harmonics and perform integration simultaneously without changing the measurement mode.
- Fast display and data update rate: The fast display and 100 ms maximum data update rate of the WT300 series offers a short tact time in testing procedures. 0.1% of reading + 0.1% of range (50Hz/60Hz)
- MAX hold function: The maximum values of RMS/PEAK voltage & current active power, reactive power and apparent power can be held.
- Line filter and frequency filter capability: These filter functions will cut off unnecessary noise & harmonic components for fundamental waveform measurements.
| The WT300 series offers a wide range of communication interfaces such as USB, GP-IB or RS-232 (selectable) and Ethernet (Optional) |
Allows users to have the flexibility to choose according to applications needs. Using the WTViewerFreePlus software to set up all kinds of measurements. Additionally, the numeric values, waveform display, and trend graphs of the measurement data can be displayed and saved.
| D/A output for measurement recording |
The D/A option is used to output Voltage, Current, Power, and other measured data for recording to data loggers (+/-5Vdc outputs).
Two new functions added to D/A output option. (Firmware Ver1.04)
Two new functions, Manual Range Mode and Comparator Mode can be used conveniently with built-in PLC and recorders in production line inspection systems.
| Manual Range Mode |
The default settings will set D/A output value to rated value of measurement range. In this mode, D/A output can be zoomed in and out on each channel by arbitrarily setting the display value of measurement items when D/A output is either -5V or +5V. For example, if you measure the fluctuating current from 0.6A to 0.8A by 1A current range with D/A output range mode switched to fixed range mode, the D/A output voltage will fluctuate from 3.0V to 4.0V. The D/A zoom function is available for enlarging and observing this fluctuating value. Set the D/A output range mode to manual range mode with minimum value set to 0.6A and the maximum value to 0.8A. Then, when the current value measured is 0.6A, the output will be -5V, and when it’s 0.8A, the output will be 5V.
| Comparator Mode |
This mode will compare measured, computed, and integrated values with previously set determined value by the communication command, and output (from -5V to +5V) determined results by D/A output. If you are going to use a relay contact output, please prepare the relay and the relay drive circuit.
The upper and lower limit value of Comparator Mode
The following are the D/A output during the Comparator Mode
- Less than lower limit value. Output: -5 V
- Greater than lower limit value and less than upper limit value. Output: 0 V
- Greater than upper limit value. Output: +5 V
* The above 2 modes can only be set by the communication command.
* Both modes can be set for all D/A output items.
The WT300 series power meters are easy to use, cost effective, and accurate for a wide range of applications, such as production, testing, evaluation, and research and development.
For home appliances and office equipment
| Production line or QA testing of electric devices |
-Multiple communication interfaces such as USB, RS-232 or GP-IB and Ethernet capable.
-The compact half rack mount size helps users build smaller test systems with a better return on investment.
-D/A output function for data recording
| Development and evaluation tool for home appliances |
-5mA range helps small current measurement (WT310)
-Range skip function provides the ability to select usable ranges in advance, while auto ranging adapts rapidly to changing input conditions. [PIC]
| Testing to international standards such as IEC62301, Energy Star, and SPECpower |
-The WT310 has a high measurement resolution of Max. 100µW under the 5mA range setting.
-Simultaneous measurement of normal power parameters, harmonic components, and THD.
-Free PCM software for IEC62301 testing
| Evaluation of large current equipment |
-Direct high current measurement up to 40Arms without using external sensors
-Auto ranging function for Integration mode.
For industrial equipment and transportation
| Automotive- Battery or DC driven device evaluation |
-Accurate DC measurement: 0.3% total
-Direct high current measurement up to 40A without any external current sensor.
-Charge/Discharge energy measurement for batteries
| Duration testing and efficiency measurement for industrial motors and rotating machinery |
The WT300 series provides reliable current integration (Ah) and Energy (Wh) measurement for up to 10,000 hours. The D/A option is used to save and monitor the measurement results. An external recorder or data logger, such as a ScopeCorder, can be used to save this D/A function data along with other parameters, such as temperatures, torque, and rotation speed.
| Conformance and evaluation testing of uninterruptable power supplies (UPS) |
-Maximum order setting for THD calculations
-Efficiency measurements using a single power meter
| Multiple units for parallel testing of product evaluation of electrical equipment |
New version of the WTViewerFreePlus , measurement data can be collected from multiple WT300 units
(same model maximum 4 units).
-Various communication interfaces such as USB, RS-232 or GP-IB and Ethernet are available.
-Data update rate can also be measured simultaneously as fast as 100ms.
- power parameters can be measured up to the 200 items simultaneously.
-D/A output function for data recording is available.
 |
[WT310/WT310HC]
[WT332/WT333] |
| Model | Description |
|---|---|
| WT310 | Single-input element model |
| WT310HC | High current single-input element model |
| WT332 | 2-input element model |
| WT333 | 3-input element model |
B9284LK External Sensor Cable
For connection the external input of the WT3000 to the current sensor.
Length: 50cm
366924 BNC to BNC 1m Cable
- 366924 BNC to BNC cable for oscilloscope
- 1m BNC wire
- Simultaneous measurement with 2 units
- Input external trigger signal
758917 DMM Measurement Lead Set
- Set of 0.8m long red and black multimeter test leads
- Used in combination with a pair of optional 758922 or 758929 alligator-clip adapters
- 1000 Vrms, 32 Arms CAT II
366925 BNC to BNC 2m Cable
BNC-BNC 2m. For connection to simultaneously measurement with 2 units, or for input external trigger signal.
758921 Fork terminal adapter
- 758921 Fork Terminal Adapters
- For fitting a 4mm banana plug to a fork terminal
- One black and one red clip
- 1000 Vrms-CAT II
758922 Small Alligator-Clip Adapter 300V
Rated at 300 V. Attaches to the 758917 test leads. Sold in pairs.
758924 BNC to Banana Conversion Adapter
For conversion between BNC and female banana plug
Applicable for DL750/DL750P, SL1000 & SL1400.
758929 Large Alligator Clip Adapter 1000V
- Yokogawa 758929 Alligator Clip Adapter
- Rated at 1000V
- Attaches to 758917 test leads
- Sold in pairs black/red
758931 Screw-Fastened Safety Voltage Terminal Adapter Set
Screw-fastened adapters. Two adapters in a set. 1.5 mm Allen Wrench.
In recent years the buzzword “all electric” is becoming popular, which refers to kitchen appliances, water heaters, and other devices in the home all being supplied with electric power.
In the test of new washing machine, voltage, current, power, and the control signal on the time control panel need to be recorded.
Evaluation of vacuum cleaner requires to measure distorted waveform.
- Yokogawa WT310 Digital Power Meter
- Lighting products need to evaluate power parameters, temperature
Designing an instrumentation system for high current measurement requires careful consideration of the trade-offs associated with each type of sensing device. The purpose of this application note is to help engineers understand the sensing choices available and the corresponding trade-offs with each technology.
The objective of this paper is to show the close relationship between efficiency and power quality, and provide education on the causes of power quality, types of power quality issues, and provide guidance on measurement considerations.
This training module covers the following topics:
- Introduction & Installation
- Connecting to Instrument
- Setup, Measure, and Analyze
- File Operations: Saving and Loading Data
- Video Demonstrations
In the paper Grid-Tied Solar System published on ResearchGate, a researcher from Cal Poly San Luis Obispo uses a Yokogawa Test&Measurement WT310 Digital Power Meter to review the power, current, and voltage measurements of a microinverter system.
I’ve been using Yokogawa Test&Measurement instruments for power measurement and analysis for several years and they always get the job done. They provide extensive and thorough documentation for their equipment and their drivers are very handy. Features like screengrabs of test results for easier sharing and the remote interface (which minimizes the time we spend having to automate tests) have proven to be incredibly helpful. My team needs instruments that are well documented, easy to use, and reliable. Yokogawa instruments check all these boxes.
—Power Drive Systems Electrification Validation Test Development, Fortune 500 Leading Global Supplier of Sustainable Automotive Solutions
Brochures
Instruction Manuals
- WT310/WT310HC/WT332/WT333 Digital Power Meter Getting Started Guide (4.6 MB)
- WT310/WT310HC/WT332/WT333 Digital Power Meter User's Manual (7.2 MB)
- WT310/WT310HC/WT332/WT333 Digital Power Meter Communication Interface User's Manual (2.7 MB)
Software
- LabVIEW Drivers for WT300 Series ( NATIONAL INSTRUMENTS Web Page )
- WTViewerFreePlus for WT300/WT300E Series
- Power Consumption Measuring Software
- WTViewerE 761941
- WTViewerEfree Software
- WT300/WT300E Series Sample Programs
- USB Drivers
- TMCTL
Firmware
Drawings
- WT332, WT333 Digital Power Meter (652 KB)
- WT310, WT310HC Digital Power Meter (3.0 MB)
How-tos
- IEC 62301:2011 Ed2.0 – Household electrical appliances (measurement of standby power)
- EN 50564:2011 – Electrical and electronic household and office equipment (measurement of low power consumption)
The Power Consumption Measuring Software from Yokogawa Test&Measurement provides a comprehensive solution for standby power testing and meets the requirements of:
In this video, application engineer Kourtney Morrison demonstrates how to use the software for easy standby power measurement.
Learn how to log power measurement data continuously from a digital power analyzer when connecting it to a data recorder to easily and securely collect and synchronize voltage, current, harmonics, and power data for long periods of time, while also collecting thermocouple, RTD, and standard analog signal, all in one place.
Webinars
Why should you be concerned with your product’s power system voltage and current harmonics? From an engineering perspective, harmonics produce excessive heat in equipment that causes significant damage and results in inefficient operation. From a business perspective, compliance is an absolute requirement for entry into global markets. To minimize or eliminate these issues and establish acceptable levels of harmonics, numerous power quality standards with specifications and limits for harmonic distortion, such as IEEE 519-2014 and IEC61000-3-2, have been introduced. During this webinar, attendees will gain knowledge on the inner workings of harmonics, learn best practices for accurately measuring harmonics, learn to recognize and distinguish the critical difference between DFT and FFT, and discover important measurement tradeoffs across various test equipment.