ACA-20RM Series are the world's first digital ac-ammeters to incorporate
a built-in current transformer (CT) to directly measure the true-rms value of complex,
non-sinusoidal ac currents from 2 to 50A - no bulky and expensive 5A "donut" CTs are
required! Operation and setup is straightforward: simply pass the load-carrying wire
through the on-board CT, apply power, and the ammeter is fully operational.
Five input ranges measure 0-0.2 amps (0.1mA resolution), 0-2 amps (0.001A resolution),
0-20 amps (0.01A resolution), 0-30 amps (0.1A resolution) or 0-50 amps (0.1A
resolution). The 50A model features an oversized split-core current transformer that easily
accommodates wires sizes up to 4 AWG (21.2mm2). Two power supply options are available:
85-140V (47-63Hz), and 170-264V (47-63Hz).
All models are totally self-contained; no external components are required. Power consumption
from a nominal 120V or 220V ac supply is less than 50mA. And, precision autozeroing
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.
ACA-20RM Series 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 panel-cutout compatible with Hoyt's DMS-20 Series of ac voltage and frequency
monitors, making ACA-20RM ammeters perfect replacements for older, less reliable, analog
panel meters in today's sophisticated IT instrumentation.