WT310HC -DISCONTINUED-Replaced by WT300E
Digital Sampling Power Analyzer

Meter Current Range: 1A to 40A,
Accuracy: 0.3% of rdg – Single-input element model
Yokogawa WT310HC Power Meter


  • Basic Accuracy of 0.1% of Reading
  • Current Range: 1- 40A
  • Voltage: 15-600 Volts RMS
  • DC, 0.5 Hz to 20 kHz Frequency Range
  • Standard USB, and GPIB or RS232 Interfaces
  • Ideal for Production, Testing, Evaluation and R&D.
IIII [+] more


  • External sensor input
  • Harmonic Measurement
  • Frequency Measurement
  • Delta Computation
  • Integration measurements
  • Voltage, Current, and Active Power Measurements
  • apparent power (S), reactive power (Q), power factor (λ), and phase angle (Ø)


  • Production line or QA testing of electric Devices
  • Evaluation of large current equipment such as Induction Heaters/Cookers
  • Automotive – Battery or DC driven device evaluation
  • Evaluation testing of special waveform driven devices and distorted waveforms (including DC component)
  • Duration testing and efficiency measurement for industrial motors and rotating machinery
  • Conformance and evaluation testing of uninterpretable power supplies (UPS)


The WT310HC is a single-phase, portable, high current model with current ranges from 1 Amp to 40 Amps RMS, and voltage ranges from 15 to 600 Volts RMS. The WT310HC was designed to accurately measure conversion circuits that use energy-saving switching techniques that can cause distorted voltage or current waveforms with high harmonic content. A high resolution sixteen bit Analog to Digital converter, a digitizing rate of 100 kS/s and a bandwidth from DC and 0.5 Hz to 100 kHz allow the WT310HC to perform these complicated measurements with ease.

IIII [+] more

An optional Harmonic Analysis function is a must for the design and test engineer for use in product evaluation and power quality testing. Normal power parameters and harmonic data are measured simultaneously, providing faster, more accurate power analysis. Harmonic Analysis and THD Computations can be calculated up to the 50th order from a 50 or 60 Hertz fundamental frequency.

The Integration function measures Amp-Hour and Watt-Hour parameters. A new Auto Range feature has been added to the Integration, which is especially important for stand-by-power measurements. In the stand-by mode the current can be very low. Then when the device goes to operation mode, the current can increase substantially. The new Auto Range feature optimizes the range setting for maximum accuracy measurements.

Yokogawa’s "Average Active Power" function makes it possible to measure power consumption under conditions where the power fluctuates greatly. Watt-hours are measured over some time period, then the time is divided out to leave an average power reading. This is the preferred method for Stand-by-Power measurements and/or power transients are present.

All industry standard communication interface ports such as USB, GPIB, RS232C and Ethernet are available for the WT300 Series of Power Meters. The standard interface is USB plus GPIB or RS232C, with Ethernet as an available option. Yokogawa’s WTViewer Free Plus software is provided with each WT300 unit. IEC62301 software for stand-by-power measurements is also available as a free download

  • Literature
  • Specifications
  • Applications
  • Software
  • Accessories
Literature and Technical Information
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Test and Measurement

++ WT300 Power Analyzer | Brochure (1.9 MB)
++ WT300 Power Analyzer | User’s Manual (7.2MB)
++ WT300 Power Analyzer | Communication Interface (4.3 MB)
++ WT300 Power Analyzer | USB Driver (5.7 MB)
++ WTViewerFreePlus Software (5.7 MB)
Model: Yokogawa WT300 Series Power Meter
Model WT310HC
Power Measurement 1 element
Available with 40A input element
Basic power accuracy: 0.3% rdg +0.2% of range
Power frequency range: DC, 0.5 Hz to 100 kHz
Frequency range: 1 Hz, 10 Hz, 100 Hz, 1 kHz, 10 kHz, and 100 kHz. (auto-ranging)
Sampling Speed: approximately 100 kS, s
Effective Input for V , A: 1% to 130%
Maximum Input for V , A: 1% to 140%
Inputs Crest Factor: Maximum 300
(for crest factor 3) 15V, 30V, 60V, 150V, 300V, 600V
(for crest factor 6) 7.5V, 15V, 30V, 75V, 150V, 300V
Direct Input: Current
(for crest factor 3) 1A, 2A, 5A, 10A, 20A, 40A
(for crest factor 6) 0.5A, 1A, 2.5A, 5A, 10A, 20A
External Input 1: Current Sensor
(for crest factor 3) 2.5V, 5V, 10V
(for crest factor 6) 1.25V, 2.5V, 5V
External Input 2: Current Sensor
(for crest factor 3) 2.5V, 5V, 10V or EX2: 50mV, 100mV, 200mV, 500mV, 1V, 2V
(for crest factor 6) 1.25V, 2.5V, 5V or EX2: 25mV, 50mV, 100mV, 250mV, 500mV, 1V
Measurement Parameters
Main: Voltage, current, active power, reactive power, apparent power, power factor, phase angle, frequency, peak voltage, peak current, crest factor, integration (Wh, Ah, varh, Vah), time, %
  MAX hold
Voltage RMS, MEAN simultaneous measurement
Average active power (user defined function)
Active power integration (WP) (Wh)
Apparent power integration (WS) (VAh)
Reactive power integration (WQ) (varh)
Display: 7-segment LED, 4 items – Simultaneous display
  GP-IB Interface or Serial (RS-232) Interface (standard)
USB PC Interface (standard)
Ethernet Interface (optional)
Warm-up Time: Approx. 30 minute
Power supply: 100 VAC to 240 VAC rated, permitted 90 VAC to 264 VAC, 48 Hz to 63 Hz
Power consumption: Max 80 VA
Operating Temperature: Temperature: 5°C to 40°C
Temperature: −25°C to 60°C (storage)
Storage Temperature: Humidity: 20% RH to 80% RH (No condensation)
Dimensions: Approx. 213 (W) × 88 (H) × 379 (D) mm
Weight: Approx. 3 kg
Battery backup: Setup parameters are backed up with a lithium battery.

Production line or QA testing of electric Devices

  • Compact half rack-mount size helps customers build smaller test systems with a better return on Investment (ROI)
  • D/A output function for data recording
  • Multiple communication interfaces. USB, RS-232 or GP-IB and Ethernet capability.

The simultaneous measurement of power consumption parameters such as U, I, P, frequency, Power Factor and Harmonics for production line or QA testing results in reduced tact times. Thus testing is faster and cheaper. The DA output and communication interfaces enable data to be remotely and flexibly captured.

Evaluation of large current equipment such as Induction Heaters/Cookers

  • Direct high current measurement up to 40A rms without using external current sensors (WT310HC).
  • Auto ranging function for Integration mode

The WT310HC allows 40Arms to be directly input without the requirement to use current clamps or current sensors. This not only provides more precise measurement but also saves on investment costs. The wide current ranges are from 1A to 40A and voltage ranges are from 15 V to 600 V.
Customers can use it for the evaluation of special waveform-driven devices such as IH cookers and heaters

Testing to international standards, such as IEC62301, Energy Star and SPECpower

  • The WT310HC has a high measurement resolution of max 100μW under the 5mA range setting.
  • Simultaneous measurement of normal power parameters, harmonic components and THD.
  • Dynamic input capability of crest factor max 300 (Peak value / minimum effective RMS value)
  • Free PCM software for IEC62301 testing

The WT310HC together with the power consumption measurement (PCM) software enables users to perform standby power testing according to international standard

Automotive – Battery or DC driven device evaluation

  • Accurate DC measurement: 0.3% total (WT310HC: 0.5% total)
  • Direct high current measurement up to 40A without any external current sensor (WT310HC).
  • Charge/Discharge (+/-Wh, +/-Ah) energy measurement for batteries

The WT310HC can measure currents up to 40A directly. This provides a cost-effective and accurate method for testing DC driven devices in vehicles without having to use extra sensors.

Evaluation testing of special waveform driven devices and distorted waveforms (including DC component)

  • DC, 0.5Hz to 100kHz broad bandwidth capability
  • Average active power measurement under integration mode

The WT300 series has a broad frequency capability of DC and from 0.5Hz to 100kHz. It can measure the RMS value of distorted waveforms like square waveforms or special waveform driven devices. The average active power measurement function gives accurate power consumption data for fluctuating power devices such as burst waveform operated devices. Therefore the customer can perform accurate distorted waveform measurements without using special mode settings.

Duration testing and efficiency measurement for industrial motors and rotating machinery

  • Integration measurement for long period
  • D/A output function for data recording
  • DC, 0.5Hz to 100kHz broad bandwidth capability

The WT300 series provides reliable current integration (Ah) and Energy (Wh) measurement for up to 10,000 hours (approx. 1 year). The D/A option is used to save and monitor the measurement results (WT310HC/WT310HCHC: 4ch, WT332/WT333: 12ch). 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 uninterruptible power supplies

  • Maximum order setting for THD calculations
  • Efficiency measurements using a single power meter
  • Average active power measurement under integration Mode

The WT300 series enables users to conduct conformity tests according to UPS performance testing standards. The WT300 series is used to measure and calculate input & output levels, the efficiency, frequency and THD. The average active power data also provides accurate values of power consumption. The WT300 series along with the WTViewerFreePlus software helps to simultaneously measure all the necessary parameters required to test a UPS thereby reducing the evaluation time.

Power Consumption Measuring Software

WTViewer is a software program that reads measured numerical, waveform, and harmonic data. Data can be transferred to a personal computer via GP-IB, Ethernet, or USB communications to display and store numeric or waveform data. A communications option can be installed in the WT300 as needed.

  • Waveform Display Measured data of input elements 1 to 3, and PΣ can be displayed on the PC screen via communication
  • Waveform Display Voltage and current waveforms can be monitored on the PC screen.
    You can confirm the voltage and current waveform shapes, waveform distortion, and other phenomena

WT300 Series Sample Program

These are sample programs in Visual Basic, Basic net and C# for the following communication interfaces: GP-IB, Ethernet and USB for WT300 Series.

WTViewerFreePlus for WT300 Series (included)

The WTViewerFreePlus software can capture measured numeric values, harmonic values, and waveform data. The data can be transferred to a PC via a USB, GP-IB/RS-232 or Ethernet communication interface, and it can be displayed and saved on the PC.

USB Drivers for WT300 Series

he USB Driver is needed when required by the software.

LabVIEW Drivers for WT300 Series

Data acquisition possible using LabVIEW. LabVIEW drivers can be downloaded from Yokogawa Web site. (free)

366924 — BNC cable BNC–BNC, 1 m — Qty 1 BNC cable BNC–BNC, 1 meter
366925 —BNC cable BNC–BNC, 2 m — Qty 1 BNC cable BNC–BNC, 2 meters
Adapter Sets, Leads
758917 —Measurement lead — Qty 1 75 cm, two leads (red and black) in a set
758921 —(Fork terminal adapter set) — Qty 1 4 mm fork terminal, banana terminal conversion, red and black (one each)
758922 — Alligator clip adapter (rated for 300 V) — Qty 1 Banana–alligator conversion, two in a set
758923 — Safety terminal adapter — Qty 1 (spring-hold type) Two adapters to a set.
758924— Conversion adapter — Qty 1 BNC-banana-jack(female) adapter
758931 — Safety terminal adapter — Qty 1 (screw-fastened type) Two adapters to a set. 1.5 mm hex Wrench is attached
  B9284LK —External sensor cable — Qty 1 Current sensor input connector. Length 0.5m
arrow 701961 — Deluxe Instrument Cart — Qty 1 Deluxe Cart
arrow 701962 — General-purpose Instrument Cart — Qty 1 General-purpose Cart
arrow 7511533-E4 — Rack Mount Kit — Qty 1 For EIA
arrow 7511534-E4 — Dual Rack Mount Kit — Qty 1 For EIA