Yokogawa WT3000 Precision Power Analyzer Measurements

	Model WT3000 Measurements
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WT3000 Precision Power Analyzer
Std Version Measurement Ranges

Measuring Range

Basic power accuracy:
±(0.02% of reading + 0.04% of range).
Frequency range:
DC, 0.01Hz to 1MHz.
Power factor error:
0.03% of S (when cosØ = 0)
Where 'S' is reading value of apparent power and 'Ø' is the phase angle between voltage and current.
Current Range:
0.5A/1A/2A/5A/10A/20A/30A or
5mA/10mA/20mA/50mA/100mA/200mA/500mA/1A/2A.
Current ranges are for a crest factor of 3.
External Inputs:
50mV/100mV/200mV/500mV/1V/2V/5V/10V.
Voltage range:
15V/30V/60V/100V/150V/300V/600V/1000V.
Voltage ranges are for a crest factor of 3.

Motor Version Measurements Calculation of motor and total efficiency, in addition to the functions of the standard version, the WT models offer powerful motor/inverter evaluation functions. Voltage, current, and power measurement with torque and speed input. Measure torque meter and speed sensor output (analog or pulse output), and allows calculation of torque, revolution speed, mechanical power, synchronous speed, slip, motor efficiency, and total efficiency in a single unit.

Standard Features	Optional Features
Voltage input terminals. Current external sensor input terminals. Current direct input terminals. GP-IB port. BNC connector for two-system synchronized measurement.	Serial RS-232 port (Option /C2) or USB port (option /C12). Ethernet 100BASE-TX/10BASE-T port (option /C7). VGA port (option /V1). D/A output (option /DA). Torque and speed input terminals (motor version

Characteristics Example of basic characteristics showing the WT3000's high precision and excellent stability.

Supports Crest Factor 6

The crest factor is the ratio of the waveform:
Peak value and the RMS value.

WT3000 CF

When checking the measurable crest factor of our power measuring instruments, please refer to the following equation.

However, the peak value of the measured signal must be less than or equal to the continuous maximum allowed input.

The crest factor on a power meter is specified by how many times peak input value is allowed relative to rated input value. Even if some measured signals exist whose crest factors are larger than the specifications of the instrument (the crest factor standard at the rated input), you can measure signals having crest factors larger than the specifications by setting a measuring range that is large relative to the measured signal. For example, even if you set CF=3, CF5 or higher measurements are possible as long as the measured value (RMS) is 60% or less than the measuring range. Also, for a setting of CF=3, measurements of CF=300 are possible with the minimum effective input (1% of measuring range).

Store Function (Standard with WT3000)

Voltage, current, power, and other measured data can be stored to the unit's approximately thirty megabytes of internal memory. These data can be saved in Binary or ASCII format on a PC card or USB memory. The USB port for peripherals comes with the /C5 option.

WT3000 Store Function

Each measured item can be stored every data update interval. You can specify to store only the desired measured items, thus saving memory.

Files saved in ASCII format can be opened in general-purpose applications such as Excel allowing display of data in graphs.

Files saved in Binary format can only be manipulated using dedicated software to be made available by Yokogawa.

WT3000 data example