Test Measurement Products Yokogawa combines scope and power meter in one
2014/01/17
Four power inputs
Yokogawa has combined a 100Msample/s oscilloscope with a power meter with +/-0.1% measurement accuracy in a single instrument.
This instrument brings scope functionality into the area of power measurement, with high accuracy time-based power measurement something conventional power analysers and oscilloscopes were never designed to meet.
Oscilloscopes with current probes are routinely used for basic power measurement, but accuracy can be limited to +/-10%. However, this product offers test engineers a fully calibrated power meter in a scope with a 20MHz bandwidth.
Yokogawa does not expect this instrument to replace traditional power meters which offer higher, calibrated accuracy.
But where the time-based measurement capability of the PX8000 scores over a power meter is when making transient power measurements which can be missed with an averaging power meter.
It will capture of power waveforms over specific periods of time through the definition of start and stop “cursors”.
With four scope inputs with 12-bit resolution and 20 MHz bandwidth, the PX8000 can be used for measurement of inverter pulse shapes, which can then be used to fine-tune inverter efficiency. A choice of input modules covers voltage, current and sensor measurements at voltages up to 1,000V(rms) and currents up to 5A(rms), with basic accuracy down to ±0.1%.
Higher values are possible with external current sensors.
The four inputs allow the instrument to be used to evaluate three-phase electrical systems. It can simultaneously capture and display of voltage and current across all three phases.
Like other Yokogawa power meters the PX8000 has two internal oscillators which allow measurement of harmonics in parallel with the fundamental voltage and current waveforms. Harmonics up to the 500th order of the fundamental can be measured.
Power analysis functions include direct calculation of derived parameters, such as root mean square (rms) and mean power values.
Scope functions include arithmetical calculations, time shifting and fast Fourier transforms. An automatic de-skewing function eliminates offsets between current and voltage signals that may be caused by sensor or input characteristics.
The PX8000 offers X/Y display capabilities which can be used, for example, to show the speed/torque characteristics of motors. It can also display Lissajous waveforms of input and output for phase analysis.
Application software called PowerViewerPlus can be used to capture waveform data and other analysis software can be used via the LabVIEW driver.
Inverter and motor testing is a likely application, but also for transient response measurement in wireless charging and electricity distribution systems.
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