AC line frequency meter features LED display and IP67 protection

March 09, 2016 // By Julien Happich
Murata's third generation of round, miniature digital panel frequency monitors are designed to measure and display AC mains frequencies in the range of 45 to 65 Hertz, over an input voltage of 85 to 264 VAC.

Featuring a bright LED display, the new DMR20 series is suitable for mounting in an industry-standard “oiltight” 30 and 30.5 mm / 1.2 inch round panel cutout. The DMR20-1-FM-R-C frequency monitor is a self-powered, 2-wire meter that does not require any additional external power sources. Equipped with a quartz crystal controlled microcontroller-based timing circuitry, this monitor is a companion product to Murata’s AC voltmeter, model number DMR20-1-ACV-R-C.
The meter has a display resolution of one hundredth of a Hertz (0.01Hz), making it an attractive replacement for outdated analog frequency-meters. The unit features a rugged housing with seamless construction on all sides, providing protection to IP67 / NEMA 6 specifications for dust, dirt and moisture. It can operate from -25 to + 60ºC.
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