- Measuring efficiency with high precision: simultaneous measurement
of input and output
When taking efficiency measurements of power converters, it is important
to be able to measure input and output at the same timing. The WT3000
offers up to our input elements capable of simultaneous measurement of
single-phase input/three-phase output, or three-phase input/three-phase
output.
- Accurate measurement of fundamental PWM voltage waveforms
In evaluating inverter drive motors, one of the critical measurement
parameters is the fundamental component of voltage. The mean is typically
used for voltage measurement of sinewave-modulated PWM waveforms, due to
the fact that the measured value from the voltage MEAN (rectified mean
value calibrated to the RMS value) is similar to the fundamental component
of voltage. However, motor drive technology has become more complex in recent
years; pure sinewave-modulated PWM is less common, and cases in which the
voltage mean differs greatly from the fundamental voltage waveform arise
frequently. With the optional harmonic measurement function of the WT3000
(/G5 or /G6 option), accurate measurements of commonly measured values such
as active power and the fundamental or harmonic components can be taken
simultaneously without changing measuring modes.
- Phase voltage measurement without a neutral line
With the delta computation function (/DT option), an object under test without a
neutral line can be measured in a three-phase three-wire configuration, allowing
calculation of each phase voltage.
- Achieving higher precision: measuring Instrument Loss Correction Function
Instrument loss caused by the input resistance of the measuring device is, in
principle, an unavoidable problem. Yet you can overturn conventional wisdom and
obtain higher measurement accuracy by compensating for any potential instrument
loss in the measured values.
When measuring three-phase input/three-phase output with a
three-phase four-wire system, you can measure input and output simultaneously
by synchronizing between two units.
- Related applications
Power conversion technologies such as those used in EVs and power conditioners
High-precision, simultaneous measurements are required in measuring conversion
efficiency in the conversion of a converter’s three-phase input to a DC bus,
and the conversion from an inverter’s DC bus to three-phase output.
|
|
