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| Measurement of Inverter Efficiency | Evaluation of Lighting Devices | High Accuracy Measurements of Transformers | Reference equipment for power calibration | | Harmonic measurements | Measurement of Power Consumption in Mobile Phones | Measuring Conversion Efficiency of Power Conditioner | |
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- Simultaneous measurement of voltage, current, and THD (distortion factor)
Testing of lighting devices often involves measurement of voltage, current, and
THD, a parameter that indicates the quality of power. This is because distortion in
voltage and current waveforms is becoming more prevalent due to the increasing
complexity of control systems.
The WT3000 can simultaneously measure voltage and current with THD,
eliminating these inconveniences and allowing for more accurate and rapid
measurements of an instrument’s characteristics and fluctuations.
* THD stands for total harmonic
distortion. In other words, the distortion factor.
* Please be aware that during lighting testing, the
measured values and efficiencies may not be stable since the power conversion
efficiency fluctuates over time due to the emission of heat.
Lamp Current Measurement
Since lamp current flows inside of fluorescent tubes, normally it cannot be
measured directly. However, lamp current can be displayed by measuring
secondary current and cathode current and finding the difference in their
instantaneous values using the delta computation function (/DT option).
- Related applications
Evaluation of power quality in equipment designed to be connected in a
system,
such as UPSs and power conditioners
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- High accuracy even at low power factors
The WT3000 represents great improvement over previous models in terms of
power factor error (it is approximately three times more accurate). With
improved measurement accuracy in the lower power factors—such as with
transformers, active power values can be measured with higher precision.
- Simultaneous measurement of RMS and the mean
RMS (the true RMS value) and the mean (rectified mean value calibrated to
the rms value) can be measured at the same time, allowing for measurement
of corrected power (Pc) and other measurements conforming to transformer
evaluation standards.
* Current rms and current mean can not be measured
simultaneously.
- Phase Voltage Confirmation
The delta computation function (/DT option) allows both star-delta and
delta-star conversion. For example with delta wiring, you can check the
line voltage and phase voltage simultaneously without changing the wiring.
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Temperature- and humidity-
controlled calibration room
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- Basic power accuracy of ±0.02% reading
The WT3000 can be used as a reference instrument for periodic
in-house calibration of general-purpose power measurement instruments,
such as the WT210 and WT230.
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- Harmonic measurements in compliance with IEC61000-3-2
The WT3000 can be used to perform harmonic measurements in compliance with
EN61000-3-2 Ed. 2.2. Note that this capability requires the /G6 option.
Yokogawa also release a very useful software application.
- Measurement of up to 50 orders of harmonics at 1 KHz
The WT3000 is useful for evaluating harmonics in equipment such as aircraft,
in which the fundamental frequency changes to harmonics. Note that this
capability requires the /G6 option.
- Harmonic measurements on four input elements
The WT3000 can also be used to observe changes in the harmonic distortion
factor in each phase. Note that this capability requires the /G5 or /G6 option.
- Measurement of phase angles between phases
The WT3000 can determine the phase angle formed between the voltage
fundamental wave of input element 2 or 3, and the voltage fundamental wave
of input element 1. It can also determine the phase angle formed between the
current fundamental wave of input element 1, 2 or 3, and the voltage fundamental
wave of input element 1. Note that this capability requires /G5 or /G6 option.
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