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Yokogawa
 Model WT2010/WT2030
High Accuracy, Digital Power Meters		  
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WT2000
  
 
  Characteristics:  
 
 
  • 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
     Make the WT2000 the appropriate power meter for accurate PWM inverter efficiency 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 250 ms
     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.
  
 
  Product Description:  
 
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The WT2000 digital powermeter series has been designed with emphasis on basic performance (bandwidth, accuracy, response speed, and noise immunity) from the viewpoint of measurement of electrical quantities. The broad range of functions of these power analyzers enable them to be used in various fields of applications.

  
 
  Features:  
 
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  • Built-in printer (optional)
     By using a built-in printer, you can print the measurement values and set 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
     You can select the range and measurement mode for each input element

    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)

  • 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.
  
 

 

 

  
  • 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.

 

 
  • Integration function
    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.

 
 
  Applications for WT2010/WT2030:  
 
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  • Power Measurement of High Frequency Lighting Systems
    Click here for the application note.

  • Measurement of efficiency of large inverter-driven motors
    The WT2000 series enables you to set the measurement range for each input element, permitting accurate measurement according to the level of each input signal. The 3-phase 4-wire model permits measurement of single-phase power and 3-phase power (3-phase 3-wire, 2-wattmeter method), and the MATH function enables you to perform input-to-output efficiency calculations. When you need different sensors to measure large currents and high voltages, please contact your local YOKOGAWA representative.

  

 
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  • Power calibration system
    The WT2000 series has a high basic power measurement accuracy of 0.04% of rdg + 0.04% of rng (cos f = 1, 45 Hz to 66 Hz), and also the effect of power factor is small, being 0.1% of rng (cos f = 0, 45 Hz to 66 Hz), hence you can use the instrument as a standard for calibrating various wattmeters, reactive power meters, and power factor meters.
    FG120: Yokogawa 2-channel
    Synthesized Function Generator
    2558: Yokogawa AC Voltage/Current Standard

 
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  • Measurement of cooling and heating performance of air conditioners
    The WT2000 series has a wide bandwidth (DC and 2 Hz to 500 kHz) and high accuracy (0.04% of rdg + 0.04% of rng), and can directly measure inputs of up to 30 A. It is therefore suitable for evaluating the stability of an air conditioner in an environmental test chamber during measurement of the cooling and heating performance, and also for measuring electric power and electric power quantity after evaluating the stability.

 
 
  Downloads:  
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  pdf_pic Downloads:General Specifications  
base

Ethernet Functions Requires the WT1600's optional Ethernet function to utilize this functio

FTP Server/FTP Cilent WTViewer can simultaneously control up to four WT1600s for multi-channel measurement.

The FTP client function makes it possible to transfer data saved in the WT1600's internal memory to your PC.

Software System Requirements
Operating system: Windows 98, Windows Me, Windows 2000 Professional, or Windows XP

Floppy disk drive: 3.5" floppy disk drive using 1.44 MB (MS-DOS compatible) type disks

Hard disk: A hard disk drive with 10 MB of available free space

Video adapter: A video adapter capable of displaying at 640 x 480 or higher resolution (1024 x 768, 16 bit color or higher recommended)

Display: VGA and Windows compatible display capable of displaying 256 colors (RGB) or more

Printer: Any device compatible with Windows
Mouse: Any device compatible with Windows

Communications interface:
GP-IB: a GP-IB adapter by National Instruments (AT-GPIB, AT-GPIB/TNT, or PCMCIA-GPIB)
RS-232: a built-in port, or COM1 or COM2 exclusive (COM1 only for PC9801 or PC9821)

 

 

Current sensor unit accessories for digital power meters and power analyzers. DC to 100 kHz/600 A peak Guaranteed calibration with powermeters

Current sensor units can be used for large-current power measurements, which are difficult to take directly in excess of a power meters rating. With the ability to measure a wide range of frequencies from DC to 100 kHz with high precision, these can be used in a variety of power measurement applications, such as EV/ inverter drive motors and fuel cells. In addition, they can be calibrated when used in combination with Yokogawa's WT Series of digital power meters . This makes them well-suited to power measurement applications requiring an especially high level of precision. (However, only a limited number of points can be calibrated.) Use model 751521 for single-phase measurements and model 751523 for three-phase measurements.

  • 751521
    (for single-phase measurements)
  • 751523
    (for three-phase measurements)
  • Wide dynamic range: -600 A to 0 A to +600 A (DC)/600 A peak (AC)
  • Wide measurement frequency range: DC to 100 kHz (-3 dB)
  • High-precision fundamental accuracy: ±(0.05% of rdg* + 40 µA)
  • Superior noise withstanding ability and CMRR characteristic due to optimized casing design

 

General Specifications

Safety Standard:
EN61010-1
Over Voltage Category II
Pollution degree 2

Operating altitude:
2000m or below

Working temperature
range: 5 to 40°C

Storage temperature:
–25 to 60°C

Working humidity
range: 20 to 80% RH (no condensation)

Insulation resistance:
At least 50 MW at 500 V DC (between each input terminal and case, between each input terminal, between each input terminal and power plug, between case and power plug)

Withstand voltage:
3700 V AC 50/60 Hz for one minute (between each input terminal, between each input terminal and power plug)
2200 V AC 50/60 Hz for one minute
(between each input terminal, and case)
1500 V AC 50/60 Hz for one minute
(between case and power plug)

Power supply:
90 to 110 V 48 to 63 Hz
100 to 132 V 48 to 63 Hz
2180 to 220 V 48 to 63 Hz
198 to 284 V 48 to 63 Hz

Power consumption:
120 VA max.
Accuracy of internal clock: Approx±30 seconds in one month

Vibration conditions:
Sweep test 2-way sweep from 8 to 150 Hz in all 3 directions for 1 minute each
Durability test Frequency 16.7 Hz, amplitude of 4 mm in all 3 directions for 2 hours each

Impact conditions:
Impact test Acceleration 490 m/s2, in all 3 directions
Durability test Free-fall test Height 100 mm, once on each of
4 sides

External dimensions:
Approx. 426 (W) ´ 132 (H) ´ 400 (D) mm
Mass: Approx. 13 kg (3-phase 4-line model),
Approx. 10 kg (single phase model)
 

© 2006-2007 Electro-Meters.com
Head office located at: 900 McKay Rd., Pickering, Ontario L1W 3X8 (click for map)
Sales: 905.428.3413 | Toll-Free: 800.617.3413 | Fax: 905.428.6086 | E-Mail: sales@electro-meters.com

All descriptions and specifications are subject to change without notice
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