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Power analyzer delivers needed accuracy, range

Posted: 28 Aug 2006 ?? ?Print Version ?Bookmark and Share

Keywords:power analyzer? XiTRON? power test? testing?

XiTRON's new power analyzer

The new power analyzer from XiTRON Technologies Inc. provides both accuracy and range, attributes needed to ensure compliance with Energy Star or standby power testing.

This product is operable at DC as well as all frequencies between 20mHz through 200kHz. It's also designed for use in engineering as well as on the factory floor, where it should be readily embeddable in automated test suites, thanks to its numerous communications interfaces, including IEEE-488/GPIB (General Purpose Interface Bus), RS-232 serial, USB and Ethernet.

When enabled, the unit selects the best range, to produce the highest accuracy results for applied signals on each independent input. Changes to a higher range take less than 10ms per range, and changes to a lower range take less than one cycle of the minimum frequency per range.

The 2801 can change to a lower range at up to two ranges per cycle. If commanded via GPIB, for example, range changes occur in less than 5ms.

Operable from 12Vdc, the 2801 could also be used in the field. In the lab, XiTRON ships these units with a so-called universal charger and 3-prong AC power cord. The charger comprises a universal-input supply that can accommodate 100V through 240Vrms inputs at 50-60Hz.

In use, the Model 2801 can also be used with external current transformers and transducers to extend its range. It will make source or load measurements, with wiring loss and voltage burden compensation.

16bit waveform capture
In addition to displaying numerical results on its multi-line backlit LCD, the 2801 advanced single channel power analyzer can capture waveforms with 512-point precision. It relies on 16bit ADCs to do that, which sample at 235KSps rates. Power and amplitude measurements, with an accuracy of better than 0.1 percent, are automatically synchronized to the fundamental frequency.

In operation, results and waveforms can be displayed, or read via the unit's communication ports. Alternatively, results can be transmitted at full resolution to a USB-compatible printer. Peak, rms, rectified and DC measurements of voltage, current and power can be made.

You can also measure using the unit's continuous, in-rush, start-up and history modes. There are also integration modes to measure W-Hr, A-Hr, VA-Hr and integrated average power. What's more, the 2801 can also be used in waveform peak and glitch capture modes.

The various modes let you readily display amplitude, current and power, but you can also measure frequency, harmonics (out to the 100th harmonic), and factors such as total harmonic distortion, power factor, K-factor, so-called triplens (multiples of the third harmonic), glitches and more.

- Alex Mendelsohn

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