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The WT300 series digital power meters offer users the high performance and reliability customers have come to trust from Yokogawa.

• Basic accuracy: 0.1% of Reading
• DC measurement: 0.5 Hz to 100 kHz frequency range
• Measures all AC and DC parameters
• Compact design (half-rack size)
• Standard USB, and GPIB or RS232 Interfaces
• Low current measurements down to 50 micro-Amps (WT310 only)
• High current measurements up to 40 Amps RMS (WT310HC only)
• High-speed data update (up to 10 readings per second)
• Simultaneous Normal and Harmonic measurements
• Optional Ethernet interface
• WTViewerFreePlus Software included
• Single Phase measurements with the WT310 series
• Split Phase and Three Phase measurements with the WT300 series

  The WT300s enhanced specifications and its wide range of functions let you handle all your measurement applications from low-frequency to high-frequency inverters using a single power meter.

  First in Class:

  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.

  

  First in Industry:

  Integration measurement auto ranging function.

  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.

  Comparison of WT210/230 with WT310/330

  		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<PF<1	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)

  
  

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Wide current input range

• Wide current input ranges: The WT300 series offers a wide range of current inputs from a few mA t
• Simultaneous measurement of all parameters: The WT300 can measure all DC and AC parameters. The WT300 series can also measure harmonics and perform integration simultaneously without changing the measurement mode.
• Fast display and data update rate: The fast display and 100 ms maximum data update rate of the WT300 series offers a short tact time in testing procedures. 0.1% of reading + 0.1% of range (50Hz/60Hz)
• MAX hold function: The maximum values of RMS/PEAK voltage & current active power, reactive power and apparent power can be held.
• Line filter and frequency filter capability: These filter functions will cut off unnecessary noise & harmonic components for fundamental waveform measurements.

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.

The D/A option is used to output Voltage, Current, Power, and other measured data for recording to data loggers (+/-5Vdc outputs).

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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.

For home appliances and office equipment

-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

-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]

-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

-Direct high current measurement up to 40Arms without using external sensors

-Auto ranging function for Integration mode.

For industrial equipment and transportation

-Accurate DC measurement: 0.3% total

-Direct high current measurement up to 40A without any external current sensor.

-Charge/Discharge energy measurement for batteries

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.

-Maximum order setting for THD calculations

-Efficiency measurements using a single power meter

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