AC power meters

Murata has introduced a series of four-function AC power meters. The ACM20 series can measure and display AC volts, amps, watts and power factor with a typical accuracy of ±0.5% full-scale. The meters accurately display true-RMS voltage and current values of triangle and square waves plus other irregularly shaped waveforms.

The compact, rugged, surface-mount ACM20 series is designed for use in mains-powered applications such as power distribution units, breaker panels and generator sets in industrial, commercial and residential markets. A universal 85 to 264 VAC (at 47 to 63 Hz) allows use worldwide and users can choose from models with a range of either 0-30 A (with 0.01 A resolution, 7200 W max), or 0-100 A (with 0.1 A resolution, 9999 W max). Power consumption is less than 0.25 W (from a 120 VAC supply).

A front panel selector switch provides two modes of operation: a fixed reading of any of the four parameters, or a continuous cycling through all four measurements.

An optional model can display line frequency with 0.1 Hz resolution.

All meters include built-in current transformers and require no user-supplied components.