WT2010/WT2030 Digital Power Meters (DISCONTINUED)

Notice: This product was discontinued on 10.07.14.

The WT2010/WT2030 models offer advanced specifications and a wide variety of features.


The WT2010/WT2030 offers variable attenuator filtering capability and an excellent combination of features.


  • Wide bandwidth: DC, 2 Hz to 500 kHz
  • Supports a wide measurement frequency range which is essential for developing and evaluating inverter-driven products. Measures DC voltage, current and power, as well as AC voltage, current from 2 Hz to 500 kHz. (Measures AC power from 2 Hz to 300 kHz.)
  • Digital sampling technology
  • Employs a 16 bit A/D converter and a 32 bit high-speed computation DSP to achieve an accuracy of 0.03% and a measuring speed of 36 items of data/250 ms.
  • Excellent noise and common-mode voltage rejection
  • The WT2000 is an excellent choice for accurate PWM inverter measurements.
  • Power accuracy: 0.04% of rdg + 0.04% of rng
  • The instrument is designed for high accuracy, permitting low power factor and reactive power measurement. The measurement error at zero power factor is as low as 0.1% of rng (45 to 66 Hz), making it suitable for inspecting transformers.
  • High-speed response: 36 measured values in 250ms
  • The instrument can simultaneously measure and output a maximum of 36 items of data per 250 ms, enabling the acquisition time on computerized inspection and evaluation lines to be reduced and the measurement efficiency to be increased.
    • Built-in printer (optional)
    • By using the built-in printer, you can print the measurement values and the setting data. Also, when performing harmonic analysis, you can print out the measurement values in the form of a bar graph.
    • Harmonic analysis function (optional)
    • By installing a harmonic analysis function, you can measure voltage, current, power and harmonic content up to the 50th harmonic in accordance with IEC1000-3-2. (The analysis range can be set between the 1st and 50th harmonic, and the window width can be varied according to the fundamental frequency.)
    • Voltage fluctuation and flicker measurement function (optional)
    • Flicker is evaluated according to the extent of the fluctuation (flicker) of brightness perceived by the human eye. The limit value of flicker caused by electrical equipment is stipulated by IEC1000-3-3 (an international standard pertaining to the limit values of voltage fluctuation and flicker for equipment that has a rated input current per phase of no more than 16 A). This instrument measures five kinds of values covered by this standard (relative steady-state voltage change, maximum relative voltage change, time during which the relative voltage change exceeds the threshold level, long period flicker value, and short period flicker value), enabling you to judge these values with respect to the limit values
    • MATH Function
    • This function enables you to calculate the input-to-output efficiency and crest factor, perform mathematical operations between DISPLAY and A and B.
    • Peak overload warning
    • LED indicators warn you if the peak voltage or current exceeds the maximum allowable value for any element.
    • Range and measurement mode selection
      • RMS: Calculation and display of the true RMS value
      • MEAN: Calculation and display of the rectified MEAN value converted into an RMS value
      • DC: Calculation and display of the DC value using a simple averaging method (with sign)
    • You can select the range and measurement mode for each input element.
    • Wh or Ah measurement
    • You can display the results of measurements with maximum resolution even for short integration periods by varying the resolution according to the integration time. You can also perform signed DC input data integration.
    • Line filter function
    • The instrument has a line filter which is effective for measuring the RMS value of the fundamental wave of the output voltage which is necessary for evaluating an inverter. You can select a cutoff frequency of either 500 Hz or 5.5 kHz.
    • Setting the display update rate
    • You can set a suitable update rate for the operation frequency of the measurement object. For a display update rate of 2 seconds, you can perform stable measurements from 2 Hz.
    • Display
    • You can display four items simultaneously at a maximum resolution of 50000 counts. During frequency measurement, a resolution of 1 mHz can be achieved for an input at the commercial line frequency.
    • Peak hold function
    • By using this function, you can hold and display the maximum value (peak value) of each measurement value. (This does not apply to integration or harmonic analysis.)
    • Key-lock function
    • This function enables you to disable the keys so that settings are not changed if you accidentally touch the keys during measurement.
    • Current inputs
    • Large capacity diodes are installed to protect the internal shunt resistors from damage in the event of an input overload. The current inputs are isolated from the voltage inputs. (The maximum withstanding voltage between the voltage and current input terminals is 3700 V AC.)
    • 14-channel D/A output (optional)
    • Provides V DC F.S. analog outputs for V, A, W, var, PF, deg and Hz. You can freely select the items to be output on these 14 channels as well as the communication output and printer output.

    New high-speed-response type digital filter

    For the WT2000 series, we installed a high performance DSP and also developed a "variable attenuation type filter method" as same as 2531 to realize multiple items simultaneous measurement and high speed response which are required for electric power measurement. This filtering method enables the attenuation constant to be varied for each sampling. Compared to the conventional analog filter it has various merits including the following: (1) it has low ripple and fast response, (2) it prevents the number of calculation processing operations of the DSP from increasing, and does not significantly reduce the sampling rate, and (3) there is no need to synchronize it with the interval of the input signal. As a result, the measurement values are unaffected even if the frequency changes or a low frequency waveform is superimposed on the input signal. This method realizes a high response of 36 items of data/250 ms.

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    Superior noise immunity

    PWM type inverter equipment which is very widely used generates a voltage waveform by switching the frequency conversion circuit, hence the output contains a lot of noise. To ensure accuracy when measuring such equipment, it is important that the measuring instrument have high noise immunity. In the design of the WT2000 series, care was taken to minimize the effect of common mode noise, power line noise and pulse noise, thus ensuring highly accurate and stable measurement.

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    Integration function; High speed sampling that enables the instrument

    The integration method used in the WT2000 series enables the instrument to continuously acquire data by sampling the input signal at a high rate of about 110 kHz. As a result, the instrument can measure abrupt changes in input value, which was difficult to realize with conventional measuring instruments, thus enabling integrated values to be measured with very little loss of data. (There is virtually no delay or pause period due to the response of the filter.) With YOKOGAWA's conventional models, the resolution of the displayed value resulting from an integration operation is fixed by the maximum integration time, hence for short period integration, the bottom digit was not displayed and the resolution was insufficient. The WT 2000 series uses an "auto resolution method" in which the display resolution automatically changes along with the lapse of the integration time, ensuring the maximum resolution even for short period measurement.

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    An example of frequency vs. power accuracy

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    The power factor error as percent of reading vs. power factorTm Wt2010 07Tm Wt2010 08
    An example of linearity of power valuer

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      ModelDescription
      253101WT2010/WT2030 Single Phase Model
      253102WT2010/WT2030 3-phase, 3-wire model
      253103WT2010/WT2030 3-phase, 4-wire model
      Overview:
      Check for differences in the specifications or features of the instruments. For values that do not match when inputting a 50/60 sine wave Check whether the value is within the specifications (error) of each power ...
      Overview:
       In the case of three-phase three-wire, or 3V3A wiring, the power, power factor, and phase angle of each input element do not match because it is the line to line voltage that is measured.   Please download and refer ...
      Overview:
      The measurement intervals of the measured I/O data must overlap exactly. Check the sync source setting. For example, route the input to a three-phase device under measurement to input elements 1-3 on the power meter, ...
      Overview:
      Check for differences in the specifications or features of the instruments. For values that do not match when inputting a 50/60 sine wave Check whether the value is within the specifications (error) of each power ...
      Overview:
      The waveform may actually not be a pure sine wave. Even though a 50/60 Hz sine wave is expected, the following factors may be involved: The waveform is slightly distorted (harmonic components are mixed in) Small ...
      Overview:
      Check the "Sync Source" and zero cross filter (frequency filter) settings. For the WT3000, "Sync Source" setting is irrelevant if the data update rate is 250 ms, 500 ms, 1 s, or 2 s. Sync Source SettingIn principle, if ...
      Overview:
      In the three-phase three-wire, or 3V3A wiring scheme, the phase angle of voltage and current input to each input differs from that of the actual load because it is the line to line voltage that is measured.  In ...
      Overview:
      The peak value and crest factor may be unstable if they have not been captured accurately. If the peak value is not stable, neither will the crest factor be stable. The cause is the difficulty in capturing the narrow ...
      Overview:
      The input terminals on all Yokogawa power meteras are located on the rear panel. This takes into account safety when handling the measuring instrument.    The signal input to the power meter normally carries high ...
      Overview:
      This is to prevent an open current circuit. Among non-Japanese power meters, there are products that also use safety terminals for current terminals. Safety terminals can be said to be safe because the terminal is not ...
      Overview:
      Check the Synch Source and Frequency Filter settings When a single-phase signal being measured fluctuates around power factor of 1.Slight fluctuations in the measured values of voltage, current, and power can cause a ...
      Overview:
      The following may be causing the problem. 5V may have occurred during rating. Check the range setting again. DA output error can affect the values when the input is smaller than the rating. Have you checked the error ...
      Overview:
      The difference in measurement values can be attributed to the difference in calculation methods for normal mode and harmonic mode.   The voltage, current, and power in normal mode are displayed as the total of the ...
      Overview:
      To change the voltage range on element 1 to 30 V, send the "CONFIGURE:VOLTAGE:RANGE:ELEMENT1 30V" command to the measuring instrument.To change the current range on element 1 to the 1 A range, send the ...
      Overview:
      You can use the "STATUS:ESSR?" command to access the extended event register and determine whether the data was updated. You can judge the data update status by referencing bit 0 (UPD) of this register. However to do ...
      Overview:
      Please download the attached PDF file for a list of pinouts for various communication cables.
      Overview:
      Yes, it is possible to alter the standard model WE7000. The following is a list of range standard special order specifications and correspond models. Current Range 1/10 A Model: WT1010, WT1030, WT1030M, WT2010, ...
      Overview:
      The part numbers for the black current knobs and pads (studder) is listed below: A9105ZG: Black Current Knob Set of 2 B9292GX: Pad (Studder) Set of 10
      Overview:
      The specifications for the Type 2553 DC Voltage/Current Standard was changed on June 1982. The service manual was not rewritten to reflect these changes. There are two types of 2553:          1979/4 -- ...
      Overview:
      The WT3000 D/A output terminal is electrically isolated from the case. For all other models, the D/A output terminal is connected to the case.
      Overview:
      The optical resolution of the analog D/A option is 12-bits.
      Overview:
      The WT1000/WT2000 series instrument uses a BNC connector for the external shunt input terminal. The output terminal of the 751550 Clamp Probe is a banana plug. Please use the 366921 Banana-to-BNC Conversion Adapter to ...
      Overview:
      Send the "MEASURE:ITEM:NORMAL:PRESET:CLEAR" command. This command turns all items for output OFF. Therefore no items will be output if you send the "MEASURE:VALUE?" command. Send the "MEASURE:ITEM:NORMAL:V:ELEMENT1 ON" ...
      Overview:
      You can determine whether data was updated by performing a serial poll and referencing the status byte.Bit 0 of the status byte (D101) changes to 1 when data is updated. When bit 0 changes to 1, bit 6 (D107) also ...
      Overview:
      To change the voltage range on element 1 to the 30 V range, send the "RV1,4" command to the measuring instrument. To change the current range on element 1 to the 1 A range, send the "RA1,5" command to the measuring ...
      Overview:
      Send the "OFDO" command.This command turns all items for output OFF. Therefore no items will be output if you send the "OD" command. Send the "OF1,1" command to the measuring instrument. This command turns the voltage ...
      Overview:
      Send the appropriate command as shown below to your instrument, then read in all the data that is returned.     PZ4000: "NUMERIC:NORMAL:VALUE?"    WT1600: "NUMERIC:NORMAL:VALUE?"    WT100/200 series ...
      Overview:
      The value depends on the model of the power analyzer. For WT1000, WT2000, WT100, and WT200, it is fixed to the fundamental wave. For power analyzers with 7 segments LED, the relative harmonic content is fixed to the ...

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