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.
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.
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.)
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) |
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, 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
* 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.
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.
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] Results of Life Cycle Assessment. [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 |
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.
This training module covers the following topics:
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.