WT210 Digital Sampling Power Meters (half-rack size)

Superior Performance & Cost Effective Wide Current Range: 5mA to 20A DC 0.5 Hz to 100 kHz


  • Maximum input with assured accuracy: 26 A
  • Frequency range: DC, 0.5 Hz to 100 kHz
  • Basic Accuracy: 0.1%
  • High-speed data update (as fast as 10 readings per second)
  • 5 m A range for very low current measurements
  • Line filter function
  • Large-current measurement capability using external sensor input
  • Easily Acquire and Manage Power Measurement Data from Your PC
  • Compact design (half-rack size)
IIII [+] Options and Applications


  • External sensor input
  • Harmonic Measurement
  • 12-channel DA output
  • Comparator and D/A, 4 channels each


  • Power Supply Harmonic Measurements
  • GO/NO-GO Evaluations on Testing Lines
  • Online Power Meter Control and Recording
  • Evaluation of Commercial Power Supplies, Battery and Low-frequency Equipment.


The WT210 is a single-phase portable power meter with a fundamental accuracy of 0.2% and a wide-bandwidth. It can measure AC and DC signals from 0.5 Hz to 100 kHz (measures up to 20AAC). Its wide range of functions let you handle all your measurement applications from low-frequency equipment to high frequency inverters using a single power meter. The WT210 has a high-speed data acquisition rate and can measure up to the 50th order of harmonics and capture transients, all this in a compact design at an affordable price!

  • Literature
  • Specifications
  • Functions and Options
  • Software
  • Accessories
Literature and Technical Information
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Test and Measurement

++ WT210 Power Analyzer | Brochure (430 kB)
++ WT210 Power Analyzer | User’s Manual (5.7 MB)
++ WTViewer Software (5.2 MB)
Model: Yokogawa WT210 Power Meter
Model 760401
Number of elements 1 element
Available with 20A input element
Basic power accuracy: 0.1% of reading +0.1% of range
DC power accuracy 0.3% of reading +0.2% of range
Power frequency range: DC, 0.5 Hz to 100 kHz
V / A frequency range: 100 kHz
Sampling Speed: Approximately 50 kS/s
Accuracy range for V / A: 1% to 130%
Inputs Crest Factor: Maximum 300
  15 V, 30 V, 60 V, 100 V, 150 V, 300 V, 600 V
Direct Input: Current
20 A input element  
  5mA,10mA,20mA,50mA,100mA,200 mA,
0.5 A, 1 A, 2 A, 5 A, 10 A, 20 A
External Input: Current Sensor
  50 mV, 100 mV, 200 m V, 2.5 V, 5 V, 10 V
Data Memory  
Data memory: Maximum 300 samples
Data Update  
Rate: 100 m, 200 m, 500 m, 1, 2, 5 [S]
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)
  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)
D/A Output (optional) Output data selection: Can be set separately for each channel.
Number of outputs: 12 parameters with /DA12 option
D/A converter: 12-bit resolution
Harmonic Measurement in Normal Measurement Format PLL synchronization
Frequency PLL source of fundamental frequency : 40-440 Hz
Window Rectangular
FFT data length 1024 @ 32 bit processed word length
Display: 7-segment display
Waveform Display
Numerical: numeric (3 values)
Power supply: 100 to 240VAC (automatic switching) — 50/60Hz
Power consumption: Max 55 VA
Operating Temperature: 5 to 40°C, 20 to 80% RH
Dimensions: Approximately 213 (W) x 132 (H) x 379 (D) mm
Weight: Approx. 5 kg (main unit with 3 power modules installed)

A Wide Frequency Range Lets You Work on a Variety of Different Applications

  • Low-frequency Equipment
    Low-frequency measurements starting at 0.5 Hz
    Low-frequency measurements starting at 0.5
    Hz can be used with evaluations of
    cycloconverter and when a motor are started
  • Commercial Power Supplies — 0.1%
  • Inverters — 100 kHz power frequency range
    Now you can obtain more precise measurements on high-frequency equipment such as inverters.

Capture a Variety of Signal Types

  • Surge current and maximum load state
    — MAX hold function for voltage, current, & power 3
    This function lets you keep, on the display, voltage and current peak values, voltage and current rms values, and maximum values for active power, apparent power, and reactive power
  • Half-wave Rectification, Intermittent Control, Distortion Waves
    —Measurement of DC components
    In addition to using DC inputs, you can obtain precise measurements of signals containing DC components, such as intermittent signals and half wave rectification signals
  • Constantly changing signals
    — Quick response with display updating as fast as every 0.1 second With measurement intervals as short as 0.1 second, you can capture transient phenomena with a fine level of detail. You can also reduce the time per measurement for increased through put in production testing
  • Noisy Signals
    — Line filter function (fc = 500 Hz)
    This function lets you measure fundamental wave rms values for inverter output voltages

Powerful Tools for Energy Measurement

  • Extended Energy Measurement Applications
    — Maximum integration time: 10,000 hours 3
    Time can be set between 1 second and 10,000 hours (416 days) in 1- second increments.
  • Battery equipment applications
    — Integrating power measurement by polarity Power and current values can be integrated separately for positive and negative polarities. Integrated values are shown with the decimal point moving according to the integrated value.
  • Extended Energy Measurement Applications
    — Maximum integration time: 10,000 hours 3
    Time can be set between 1 second and 10,000 hours (416 days) in 1- second increments.

Applications for a Variety of Add-on (Options )

  • Large-current Measurement Using Current Clamps
    — External input for current sensor
    Select either 50/100/200 mV or 2.5/5/10 V.
    A current clamp lets you measure currents without needing to disconnect the power supply circuit wiring.
  • Power Supply Harmonic Measurements Calculate voltage, current, reactive power, content ratio, and phase angle relative to fundamental frequency for up to 50 orders. This option is well-suited to power supply environment evaluations. Measurement time is approximately GP-IB/serial interface (RS-232-C) 90% shorter than in former models
  • GO/NO-GO Evaluations on Testing Lines
    — 4-channel comparator function
    A 4-channel relay contact output (normal-open and normal-close pair) lets you do GO/NO-GO evaluations on production and testing lines.
  • Recording to a Recorder
    — D/A Output
    This option lets you output a variety of measurement data, such as voltage, current, and power measurements, with ±5 V rating, for recording on a recorder.
    The recorder can then be used to check changes in data over time.
  • Online Power Meter Control and Recording
    — GP-IB/serial (RS-232-C) interface
    This option lets you control the power meter through a PC, or save data to a PC.

WTViewer Software
Easily Acquire and Manage Power Measurement Data form Your PC

WTViewer is a software application that allows you to load numeric and waveform data measured with the WT210 Power Meter to a PC via GP-IB or serial (RS-232-C) communications. It lets you view the measured data then save it to hard disk. Using GP-IB allows you to connect up to four WT210s simultaneously

  • Numeric Data
    WTViewer can display the voltage, current, power, and phase of the measured data simultaneously. It can display up to 250 data items on the screen at once.
  • Waveform
    WTViewer lets you monitor voltage and current waveforms on your PC screen. The waveform display function lets you check the voltage and current phase angle, waveform distortion, and peak shapes.

    • The WT210 requires an harmonic analysis option (/HRM) for waveform display and harmonic measurement.
  • Harmonic Measurement
    With WTViewer, you can numerically or graphically display the results of measured harmonics of voltage, current, power, and phase harmonics up to the 50th order.
  • Trend
    Various types of measured data can be displayed in a trend graph. You can survey chronological changes in such phenomenon as the variations in the supply voltage
    and current consumption. Harmonic trends can also be displayed.
  • Settings up WT210 from Your PC
    You can enter WT210/WT210 settings such as the wiring method, range, filters, and scaling from your PC. These settings can be saved on the PC then loaded back in all at once when needed.
  • Converting Data to CSV
    Waveform and numeric data can be saved on the PC. From the PC you can create .wtd files that can be loaded by WTViewer for WT210/WT210, or .csv files that can be imported into Excel.
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
Clamp-on Probes and Transducers
arrow 751522 — Current transducer — Qty 1 DC to 100 kHz (-3 dB), 600 Apk
  960 01 — Clamp- on Probe — Qty 1 20 Hz to 20 kHz, AC 400 Arms
arrow 751574 —Current Transducer — Qty 1 , DC and up to 100 kHz, 0-600 A peak
arrow 760122 WTViewer— For WT210 Software
B9284LK —External sensor cable — Qty 1
Current sensor input connector. Length 0.5m
arrow 7511533-E3 — Stand-alone Rack Mount Kit — Qty 1 For EIA
arrow 7511534-E3 — Connected Rack Mount Kit — Qty 1 For EIA