|Murata Power Solutions' ACA5-20RM series ammeters accept the output of external 5A current transformers (CTs) and accurately display the true-rms value of complex, non-sinusoidal AC currents up to 500A. Operation and setup is straightforward. Simply pass the external 5A CT’s secondary 0 to 5A output leads through the ACA5-20RM’s onboard toroid sensor, apply AC power, and the ammeter is fully operational. All models are totally self-contained—other than the external 5A CT, no other user-supplied components are required. Three input ranges measure 0 to 100.0A (with 0.1A resolution), 0 to 200A (0.1A resolution), and 0 to 500A (1A resolution). Two power supply options are available, including 85 to 140V (47 to 63Hz), and 170 to 264V (47 to 63Hz). Power consumption from a nominal 120V
or 220V AC supply is less than 50mA. Additionally, precision auto-zeroing circuitry, super-stable components, and an rms-to-DC converter circuit combine to achieve excellent performance when measuring the complex, non-sinusoidal, AC currents found in today’s computer/telecom equipment.
ACA5-20RM series rms ammeters feature full-size, 0.37" (9.4mm) high, 3½ digit, bright red LED displays and a built-in bezel/filter assembly that features metal fasteners. They are also panel cutout compatible with Murata Power Solutions’ DMS-20RM series of rms-reading AC voltage monitors, making ACA5-20RM ammeters perfect replacements for older, less reliable, analog voltmeters and ammeters in today’s sophisticated instrumentation. Datasheet