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Fully compliant interharmonics power analyser

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article image The EM TEST Model DPA 500.

THE EM TEST model DPA 500, available from Consultant Technology , is a fully compliant analyser for interharmonics, harmonics and flicker, as per the latest IEC/EN 61000-3-2 and IEC/EN 61000-3-3 requirements.

It also follows the design specifications as per IEC/EN 61000-4- 7:2002 (for Class A instruments) and IEC/EN 61000-4-15:2003.

Random voltage fluctuations caused by varying load currents, may influence luminance or spectral distribution of lighting systems, creating an annoying, unsteady visual sensation producing a light stimulus, called flicker.

This flicker phenomenon also needs to be evaluated and kept to a minimum.

The DP A500 is based on a real-time kernel and, equipped with its own hard disk, it allows the recording of measured data continuously without any gaps or overlapping.

The rectangular measurement window is synchronised to each group of 10 or 12 cycles of the mains supply frequency (50Hz or 60Hz) by means of the digital PLL (phase lock loop).

A wide current input range (up to 50A) avoids loss of measured data due to range switching that would occur when using different shunt resistors.

The classification of the measurement can be selected at any time, before or after the measurement has been performed. During all measurements the ac supply voltage is measured simultaneously with the current.

The built-in flicker impedance, which is automatically selected when doing flicker measurement, makes the DP A 500 a complete single-box unit for both harmonics and flicker analysis.

Control and analysing software for harmonics, interharmonics and flicker measurement, is central to the operation of the DPA500.

ISMDP A offers all features to control the DP A 500, to upload the recorded measuring data, and for the classification and analysis. It includes analysis as per the latest standards as well as procedures following the former standard requirements.

An easy Fail/Pass function allows fast analysis while detailed data is available for extended analysis and EUT evaluation purposes. ISMDP A also includes a powerful documentation capability with direct export to Word.

The EM TEST family of harmonics analysers includes two models for harmonics, interharmonics and flicker for single phase and three-phase applications.

The three-phase analyser DP A503 can be used for single-phase analysis applications.

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