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Test & Measurement

Self-Contained true-RMS Ammeters provide compact and easy-to-use solution for measurement of non-sinusoidal AC currents

16th April 2008

Murata Power Solutions Inc

ES Admin

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Murata Power Solution’s new Datel ACA-20RM series are the world’s first true-RMS responding digital AC ammeters with built-in current transformers (CTs). They are able to provide direct measurement of the true-RMS values of complex, non-sinusoidal AC currents of between 2A and 50A. Ideal for use in the latest computer and telecoms equipment, the compact, self-powered, single-board modules feature a large, easy-to-read LED display and provide an ideal replacement for older, less reliable, analog panel meters.

The Datel ACA-20RM series comprises five models with current ranges of: 0 – 0.2A (0.1mA resolution), 0-2A (0.001A resolution), 0 – 20A (0.01A resolution), 0-30A (0.1A resolution), and 0 – 50A (0.1A resolution). The modules are self-powered with both 120V (85-140VAC) and 220V (170-264VAC) versions available. Power consumption is less than 50mA.

The on-board, miniature, high-turns ratio CTs provide an accurate and straightforward way to measure AC load currents. The 50A model features an over-sized split core transformer to ease installation and accommodate wires up to 4AWG (21.1mm2). All Datel ACA-20RM series True-RMS-AC Ammeters utilise low power consumption, bright red LED displays with easy-to-read full-size 9.4mm (0.37in.) high characters.

The completely self-contained design of the modules enhances reliability and means that no external components are required. Precision auto-zeroing circuitry, super-stable components and an RMS-to-DC converter circuit combine to give the Datel ACA-20RM series excellent performance.

A built-in bezel / filter assembly with metal fasteners allows straightforward assembly of the new Ammeters into customer applications. All models use UL and CSA recognised components and have overall dimensions of 46.38mm (1.826in.) X 32.51mm (1.280in.). Operating temperature range is 0ºC to +60ºC.