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Power-supply
Date: 15-01-14

Exclusive oscilloscope for power supply design

Yokogawa has made available an oscilloscope which can capture voltage and current waveforms precisely for testing power measurement problems in power supply design.

This new scope features 12-bit resolution with 100 MS/s sampling and 20MHz bandwidth helping accurate measurement of inverter pulse shapes, which can then be used to fine-tune inverter efficiency.

Other key features include:

1. Input modules are offered supporting voltage, current and sensor measurements at voltages up to 1000 V RMS and currents up to 5 A RMS, with a basic accuracy of ±0.1%.

2. Can be configured to evaluate single phase and three-phase electrical systems.

3. Support simultaneous voltage and current multiplication to give real-time power sampling, supporting both transient measurement (as standard) and numerical values averaged across the sample period. Up to 16 different waveforms – including voltage, current and power – can be displayed side-by-side, giving engineers instant “snapshots” of performance.

4. The instrument also supports the capture of power waveforms over specific periods of time and cycle-by-cycle trends through the definition of start and stop “cursors”. This is particularly useful for examining transient phenomena and in the design of periodically controlled equipment.

5. A variety of functions including arithmetical calculations, time shifting and Fast Fourier Transforms enables users to display waveforms with offsets and skew corrections. An automatic de-skewing function eliminates offsets between current and voltage signals that may be caused by sensor or input characteristics. Users can also define their own computations via equations that combine differentials, integrals, digital filters and a wealth of other functions.

6. Measures harmonic components of voltage and current waveforms as well as the harmonic distortion factor. Harmonic measurements take place in parallel with conventional voltage and current measurements. Harmonics up to the 500th order of the fundamental can be measured.

Typical application sectors include inverter and motor testing, reactor loss measurement of inverter boost circuits, transient responses of industrial robots, wireless charger efficiency measurement, and voltage and power measurements in electricity distribution systems.

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