POWER ELECTRONICS PRODUCTS
COMBINING PERFORMANCE & PRECISION IN ONE INSTRUMENT
A
new class of instrument that combines the features of a high-
performance multi-channel oscilloscope with those of a precision power analyser has been developed by Yokogawa. As a result the company’s latest PX8000 Precision Power Scope transforms power measurement by providing levels of time-based accuracy previously only associated with precision signal analysis. This immensely versatile
instrument, unlocks precision power measurement capabilities for researchers working on everything from sustainable power to advanced robotics. Anywhere that power consumption is at a premium – which means almost anywhere power is consumed – can benefit from the introduction of this precision measurement and analysis. The vertical resolution of
analogue/digital conversion is one of the most important factors in precision measurement. This instrument has 12-bit resolution with 100MS/s sampling and 20MHz bandwidth. This means that it can be used for accurate measurement of inverter pulse shapes, which can then be used to fine-tune inverter efficiency levels. The ability to analyse cycle-by-
cycle trends makes it ideal for the measurement of transient effects. During the start-up phase of an inverter and motor, for example, current increases can be analysed in each cycle. And when the load changes rapidly, engineers can gain insights that will enable the improvement of control of the inverter. This device has both harmonic and
FFT measurement capabilities for frequency-based analysis. The harmonic function can measure fundamental waveforms from 20Hz to
6.4kHz. This is particularly useful for analysing vibrations and the causes of noise in electromechanical systems. A common problem when testing
inverter motors is the presence of ambient noise that can mean that test values are non-zero even before testing begins. Offset capabilities mean that such effects can be nullified and specific inputs can be isolated for testing and analysis. High sampling rates and broad
bandwidth make it particularly useful for testing devices, such as transformers and reactors, that have lower power factors. It is also particularly important to measure the precise power consumption of such devices at high frequency. To analyse power consumption in
low-power-factor devices it is particularly important to minimise any time differences between voltage and current caused by sensor input characteristics. The PX8000 provides precise de-skew adjustment to compensate for this time difference. Analysing reactor core loss is an
example of how the user-defined computations can be utilised to provide an instant analysis of system performance. In this case, core loss is calculated based on primary coil current and secondary coil voltage, while magnetic flux density and magnetic field are calculated by factoring in input frequency, cross-sectional area and other parameters. As an added benefit, all values can
be displayed directly. Yokogawa Europe
www.yokogawa.com +31 (0) 88 464 1429 Enter 212
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