• Better Efficiency in Power Measurements
  In developing the WT3000, Yokogawa focused on improving efficiency in two basic areas. One goal was to obtain highly precise and simultaneously measurements of the power conversion efficiency of a piece of equipment. The other objective was to improve equipment evaluation efficiency by making simultaneous power evaluations and tests easier and faster.

• New Innovations to Enhance the Reliable
  Measurement Technology
  The Yokogawa WT2000 was very popular with users and considered highly reliable because of its high precision and excellent stability. The WT3000 is based on a measurement system which combines the measurement technology used in the WT2000 as well as other WT Series models. With the WT3000, we made further improvements to the basic performance specifications for even better functionality and reliability. We are confident users will appreciate these improvements to power and efficiency measurements thanks to the new power control technologies we have introduced.

• A Variety of External Interface Choices
  The WT3000 is the first model in the WT Series which is standard- equipped with a PC card slot (ATA flash card slot). This interface allows data to be saved quickly, so data processing time is reduced. The WT3000 is also standard-equipped with a GP-IB port. In addition, a serial (RS-232) port, Ethernet port, and USB port are available as options. The variety of interface choices allows customers to use the best interfaces for a wide variety of equipment, media, and network environments.

• 50ms data updating intervals
• High-speed measurement to capture rapid data fluctuations
  Fast updating allows you to precisely capture rapidly changing transient states in the measurement subject.
  
  * The WT3000 switches between two different calculation systems depending on the data updating interval. See page other for details.

• Compensation functions
• For increased measurement precision
  The WT3000 has compensation functions for high-precision measurements. These functions can compensate for instrument-related losses resulting from the power meter’s internal impedance as well as losses related to wiring during measurement with two power meters. The following compensation functions are provided to compensate for instrument-related losses:
  
  
  • Efficiency compensation: This function compensates for instrument-related losses occurring during efficiency calculation.
  • Wiring compensation: This function compensates for instrument-related losses caused by wiring.

When measurements are performed using two power meters with three-phase three-wire wiring, errors may occur if current flows to the middle wire (or if there is a leakage current). The WT3000 has a function to compensate for such errors. Even when measurements are performed with two power meters (requires measurement with three-phase three-wire (3V3A) wiring), the current flowing to the middle wire is calculated, and a corresponding correction value can be added to the power measurement. This improves the accuracy of power measurements.

• A Variety of integration functions
• Apparent power integration and reactive power integration
• Active power, current, apparent power, reactive power
  In addition to the active power integration function (WP) and current integration function (q) included in earlier models, the WT3000 also has a new apparent power integration function (WS) and reactive power integration function (WQ).
• A wide effective input range for high-precision integration
  The WT3000 has a wide effective input range, from 1% to 130% of the measurement range. This enables higher-precision integration measurements on measurement subjects with current values that fluctuate widely from large currents down to faint currents in the standby state.
• Mean active power (using user-defined settings)
  Mean active power can be calculated over an integration interval. This feature is useful for evaluating the power consumed by intermittent-control instruments in which the power value fluctuates.

• Delta Calculation (/DT)
• Checking phase voltage when you measure line to line voltage
  This function allows you to calculate individual phase voltages from the line to line voltage measured in a three-phase, three-wire system. This is useful when you want to determine the phase voltage in motors and other items under test with no neutral lines. Line to line voltage and phase current (measurements equivalent to 3V3A) can be estimated in systems not measured from a three-phase, three-wire configuration (using two elements).
  Phase voltage (red arrow) and the other line to line voltage (the blue dashed arrow), which is not measured directly, can be calculated and displayed based on the three-phase, three-wire system’s line to line voltage (green arrows).

• Harmonic Measurement Function (/G5)
• Checking harmonic components when a wareform is distorted
  Representing an improvement over our previous models, the WT3000 is able to measure normal and harmonic measurement data simultaneously. With the WT3000, you can measure distortion factor (THD) and simultaneously monitor total voltage, current, and distortion factor without altering the measuring modes. Also, you can calculate phase angle of three phase power between phases or across input elements.
  
  * Option /G5 cannot perform harmonic measurements in compliance with IEC61000-3-2.
  Option /G6 will perform harmonic measurements in compliance with IEC61000-3-2.

• Added Frequency Measurement (/FQ)
• Checking the frequencies of all inputs
  In addition to the standard two channels of frequency measurement, a six-channel frequency measurement option is also available. This option provides frequency measurement of voltage and current on all eight channels (with input elements 1 through 4 installed). This is necessary when you want to measure voltage and current frequency from the instrument’s I/O as well as voltage and current frequencies of multiple items under test at the same time.

• D/A Output (/DA)
• Outputting measurement values as analog signals to other devices
• 20 channels
  Measured valuescan be output as ±5V 5V FS DC voltages from the D/A output connector on the rear panel. Measured parameters can be output on up to twenty channels simultaneously. Even with four input elements installed, you can send up to five types of data per element to D/A output.
• D/A zoom
  Normally the D/A output function outputs DC voltage scaled to a range of -5V to 5V* with respect to the measurement range. For this reason, it may not be possible to observe fluctuations in a nearly constant signal if the D/A output is set to go to ±5V at the measurement range rated value. One case in which this could happen is when a 100V measurement voltage fluctuates in the range of ±3V.
  The WT3000 has a D/A zoom function to solve such problems. This function allows the any input signal range to be scaled to between -5V and 5V* in the D/A output as Upper and Lower ranges. This makes it possible to enlarge input signal fluctuations for observation using a recorder or logger.

* The range is 0V to 5V for some functions, such as frequency measurement.